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Preprint ARTICLE | doi:10.20944/preprints202404.0422.v1

Secrecy Analysis of a Mu-MIMO LIS-Aided Communication Systems Under Nakagami-M Fading Channels

Ricardo Coelho Ferreira, Gustavo Fraidenraich, Felipe A. P. de Figueiredo, Eduardo Rodrigues de Lima

Subject: Engineering, Telecommunications Keywords: Large Intelligent Surfaces; Reflecting Surfaces; Mobile Communications; Nakagami-m Fading; Mu-MIMO systems

Online: 9 April 2024 (09:31:35 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0612.v1

On the Way to the Development of Smart Manufacturing Model in Practice

Darko Djoric, Milan Jordanovic, Bojan Lalic, Vidosav Dragan Majstorovic

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: Digital manufacturing; Industry 4.0; Smart manufacturing, ERP; MES

Online: 9 April 2024 (09:27:58 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0625.v1

Hybrid Intelligent Control System for Adaptive Microgrid Optimization: Integration of Rule-Based Control and Deep Learning Techniques

Osman Akbulut, Muhammed Cavus, Mehmet Cengiz, Adib Allahham, Damian Giaouris, Matthew Forshaw

Subject: Engineering, Control And Systems Engineering Keywords: deep learning; energy management system; optimization; microgrid; resilience; rule-based control; stability.

Online: 9 April 2024 (08:49:08 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0603.v1

Design of Machine Learning based algorithms for virtualized diagnostic on SPARC_LAB accelerator

Giulia Latini, Enrica Chiadroni, Andrea Mostacci, Valentina Martinelli, Beatrice Serenellini, Gilles Jacopo Silvi, Stefano Pioli

Subject: Engineering, Electrical And Electronic Engineering Keywords: beam diagnostics; electron beam; plasma-based accelerator; x-ray Free Electron Laser (XFEL).

Online: 9 April 2024 (08:44:39 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0574.v1

A NLOS Ranging Error Mitigation Method for 5G Positioning in Indoor Environments

Jingrong Liu, Zhongliang Deng, Enwen Hu

Subject: Engineering, Telecommunications Keywords: 5G positioning; Ziv-Zakai Bound; non-line-of-sight mitigation; location estimation

Online: 9 April 2024 (07:33:57 CEST)

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Preprint REVIEW | doi:10.20944/preprints202404.0418.v1

Flexible Strain Sensors for Walking Gait Monitoring

Junping Feng, Lei Shi, Yuting Zhu, Fei Huang, Kean Aw

Subject: Engineering, Bioengineering Keywords: flexible strain sensors; knee angle; muscle activity; walking gait

Online: 9 April 2024 (02:14:39 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0587.v1

Modelling of Propagation Characteristics of Acoustic Pulse from Partial Discharge in Polymeric Insulating Materials

Abdul Samad, Wah Hoon Siew, Martin J. Given, Igor V. Timoshkin, John Liggat

Subject: Engineering, Electrical And Electronic Engineering Keywords: Acoustic Emission; PD detection; High Voltage Insulation; Acoustic Propagation; Acoustic Reflections

Online: 8 April 2024 (17:21:39 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0586.v1

Surfactant-polymer Flooding: Chemical-formula Design and Evaluation for High-temperature High-salinity Qinghai Gasi Reservoir

Jinlong Sun, Yifeng Liu, Xiuyu Zhu, Futang Hu, Yuanyuan Wang, Xiaoling Yi, Zhuoyan Zhu, Weidong Liu, Youyi Zhu, Qingfeng Hou

Subject: Engineering, Energy And Fuel Technology Keywords: chemical flooding; surfactant; polymer; enhanced oil recovery; high-temperature high-salinity reservoir

Online: 8 April 2024 (17:19:59 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0486.v1

A Simplified Model to Predict the Repeated Shear Strain during the Cyclic Triaxial Test by Using an Elastic Coefficient-Damping Ratio System

Darn-Horng Hsiao, Yao-Wen Liang, Chia-Sheng Hsieh

Subject: Engineering, Civil Engineering Keywords: spring-damping system; liquefaction during cyclic triaxial test; repeated strain; spring coefficient; damping coefficient

Online: 8 April 2024 (16:32:43 CEST)

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This study uses a mass-spring-damping system to simulate the repeated strain of liquefaction cyclic triaxial tests. The two results are compared in this paper to understand the feasibility of the mass-spring-damping system developed in this paper and the feasibility of future research on this related topic and development potential. The main factors affecting this mode's repeated strain are the spring coefficient k and the external force Q0. The spring coefficient has an inverse relationship but does not increase in multiples. The external force has a direct proportional relationship but does not increase the result- a non-multiple increase. When the pore water pressure of the liquefied cyclic triaxial test specimen rises, it will cause the specimen to liquefy, decreasing effective stress, shear modulus G, and damping ratio D, causing an increase in strain. The shear modulus and damping ratio are related to the spring coefficients k and c. Both are variables that change with time. This article takes an original thin-tube specimen at point A in the Yunlin area in Taiwan as a testing example. Through Mathematica software, it can be obtained that the mass m=1kg, the spring coefficient k=244e-0.1t kgf/cm, and the damping coefficient c=0.739e-0.257t kgf-s/cm and external force Q0=10.1sin2πt kg; Finally, this study selected the original thin-tube specimens from four locations in the Yunlin area, and simulated the repeated strain amount of the cyclic triaxial test specimens through a spring-damping system. The results show that the spring-damping system is feasible for simulated cyclic triaxial tests because the model is simple and the parameters are easy to understand and obtain, which also shows the extensibility of this model. Preliminary results of the research show that this model can further simulate the repeated strain obtained by cyclic triaxial tests without considering the increased trend in pore water pressure and the decrease in effective stress during cyclic loading.

Preprint ARTICLE | doi:10.20944/preprints202404.0579.v1

From Order to Delivery: A Unified Omnichannel Framework for Dark Store

Mariateresa Caggiano, Elvia De Robertis, Domenico Ferrara, Luigi Loiacono, Francesco Liuzzi, Marco Partipilo, Sergio Pellicani, Elvira Zazzera

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: Omnichannel; Optimization; Warehouse; SLAP

Online: 8 April 2024 (14:55:19 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0557.v1

Elemental Dissolution in Multicomponent PDC Based Mixed-Phase Hard Films

Arnab Bhattacharyya

Subject: Engineering, Metallurgy And Metallurgical Engineering Keywords: Polymer derive ceramic (PDC); hard coating; interfacial nanocomposites; nanoindentation

Online: 8 April 2024 (12:29:17 CEST)

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Preprint REVIEW | doi:10.20944/preprints202404.0548.v1

Advancements in Underwater Navigation: Integrating Deep Learning and Sensor Technologies for Unmanned Underwater Vehicles

Fomekong Fomekong Rachel Merveille, Baozhu Jia, Zhizun Xu

Subject: Engineering, Marine Engineering Keywords: Visual Simultaneous Localization and Mapping (SLAM), Unmanned Underwater Vehicle, Deep learning, Underwater Navigation, Sensor integration

Online: 8 April 2024 (11:36:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0530.v1

Study of Tunnel Vehicle GNSS/INS/OD Combination Position Based on Lateral Distance Measurement and Lane Constraint

Hongbin Zhang, Xu Zhang

Subject: Engineering, Transportation Science And Technology Keywords: GNSS/INS combination; GNSS/INS/OD combination; laser radar; lateral distance measurement; lane line constraint

Online: 8 April 2024 (11:29:44 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0531.v1

Upgrading/Deacidification of Organic Liquid Phase by Liquid-Liquid Extraction Using Methanol/Water as Solvent

Nélio Teixeira Machado, Silvio Alex Pereira da Mota, Raquel Ana Capela Leão, Rodrigo O. M. A. Souza, Sergio Duvoisin, Jr., Luiz Eduardo Pizarro Borges, and Andréia de Andrade Mâncio da Mota

Subject: Engineering, Energy And Fuel Technology Keywords: Solvent extraction; Biofuel; Pyrolysis oil; Carboxylic acids; Oxygenated compounds.

Online: 8 April 2024 (11:17:45 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0524.v1

Sensors and Strategy for Anticollision Function dedicated to Augmented Electric Wheelchair

Clément Favey, René Farcy, Lucas Bogaert, Issa Berthe, Liam Jordan

Subject: Engineering, Other Keywords: anti-collision; obstacle avoidance; sensors; infrared; proximetry; detection; disability; handicap; ultrasound; augmented wheelchair; electric wheelchair

Online: 8 April 2024 (09:59:22 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0505.v1

Inspiring Sustainability in Undergraduate Engineering Programs

Tina Griesinger, Kenneth Reid, David Knight, Andrew Katz, John Somers

Subject: Engineering, Other Keywords: environmental sustainability; engineering education; learning experiences; career interests

Online: 8 April 2024 (08:30:57 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0488.v1

Advancing the Decarbonization of the Construction Sector: Lifecycle Quality and Performance Assurance of Nearly Zero-Energy Buildings

Emanuele Piaia, Beatrice Turillazzi, Roberto Di Giulio, Rizal Sebastian

Subject: Engineering, Architecture, Building And Construction Keywords: building inspection; decarbonization; digitalisation; energy-efficient buildings; environmental sustainability; Nearly Zero-Energy Buildings; prefabricated buildings; quality assurance

Online: 8 April 2024 (04:29:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0444.v1

CFD Investigation of Hydrodynamic Force and Moment Acting on Stern-Rudder Plane Configurations of a Submarine

Tien Thua Nguyen, Thanh Long Phan, Thi Loan Mai

Subject: Engineering, Transportation Science And Technology Keywords: submarine; stern rudder -plane configuration; rudder force and moment; RANS-based simulation

Online: 7 April 2024 (13:59:38 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0474.v1

A Survey on Green Enablers: Challenging Study for AI-based 5G Energy Efficiency Network

Zeinab Ezzedine, Ayman Khalil, Besma Zeddini, Habiba Ouslimani

Subject: Engineering, Telecommunications Keywords: artificial intelligence (AI); internet of things (IoT); key performance indicators (KPIs); machine learning (ML); quality of service (QoS); energy efficiency

Online: 7 April 2024 (10:50:09 CEST)

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Preprint REVIEW | doi:10.20944/preprints202404.0448.v1

Exploring Evolution and Trends: A Bibliometric Analysis and Scientific Mapping of Multiobjective Optimization Applied to Hybrid Microgrid Systems

Kawakib Arar Tahir, Javier Ordóñez, Juanjo Nieto

Subject: Engineering, Energy And Fuel Technology Keywords: Renewable energy sources; Hybrid energy system; Microgrid; Multiobjective optimization; Bibliometric Analysis; SciMAT

Online: 5 April 2024 (16:56:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0404.v1

Recalibration and Recommendation for the Prediction of the California Bearing Ratio (CBR) from Dynamic Cone Penetrometer (DCP)

Jirawat Chokkerd, Artit Udomchai, Sivarit Sultornsanee, Nopanom Kaewhanam

Subject: Engineering, Civil Engineering Keywords: California Bearing Ratio; CBR; Dynamic Cone Penetrometer; DCP; Estimation, Prediction; Forecasting; Subgrade; Sand; Soil

Online: 5 April 2024 (15:56:17 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0445.v1

Comparison of Artificial Intelligence and Machine LearningMethods used in Electric Power System Operation

Marcel Hallmann, Robert Pietracho, Przemlyslaw Komarnicki

Subject: Engineering, Electrical And Electronic Engineering Keywords: Electric power system; smart grid; artificial intelligence; machine learning; digitalization; sector coupling

Online: 5 April 2024 (13:59:54 CEST)

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Preprint REVIEW | doi:10.20944/preprints202404.0442.v1

Intelligent Petroleum Processing: A Short Review on Applying AI/ML to Petroleum Products Optimization

Abdallah Alzahawy, Hayder Issa

Subject: Engineering, Chemical Engineering Keywords: Intelligent petroleum processing; petroleum products optimization; machine learning techniques; gasoline property prediction; process control and operational efficiency

Online: 5 April 2024 (13:18:04 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0412.v1

Fruit Harvest Helper: A Cross-Platform Mobile Application For Fruit Yield Estimation

Brandon Duncan, Duke Bulanon, Joseph Ichiro Jimeno Bulanon, Josh Nelson

Subject: Engineering, Other Keywords: precision agriculture; yield monitoring; farm management; apple detection; fruit detection; farming mobile application; yield monitoring mobile application; fruit yield estimation

Online: 5 April 2024 (12:48:06 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0433.v1

Experimental Evaluation of the Robust Controllers Applied on a Single Inductor Multiple Output DC-DC Buck Converter to Minimize Cross Regulation Considering Parametric Uncertainties and CPL Power Variations

Alvaro Christian Montaño Saavedra, Walter Barra Junior, Renan Landau Paiva de Medeiros, Carlos Roozembergh Junior, Alan Sovano Gomes

Subject: Engineering, Control And Systems Engineering Keywords: Single inductor dual output DC-DC converter; parametric uncertainties; constant power load (CPL); linear quadratic regulator (LQR); integral square error; integral square control

Online: 5 April 2024 (10:25:04 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0391.v1

A Simple Method for Identifying the Natural Frequency of a Micro Satellite with a Primary Structure made of Aluminum Alloy

Keiichi Okuyama, Keigo Yoshikawa, Chihiro Oue

Subject: Engineering, Aerospace Engineering Keywords: micro satellite; natural frequency; stiffness requirement; structure designing; structure development

Online: 5 April 2024 (08:22:01 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202403.1278.v2

MnO/ZnO:Zn Thin-Film Frequency Adaptive Heterostructure for Future Sustainable Memristive Systems

Karen Ailed Neri-Espinoza, José Alberto Andraca-Adame, Miguel Antonio Domínguez-Crespo, Francisco Gutiérrez-Galicia, Roberto Baca-Arroyo, Ramón Peña-Sierra

Subject: Engineering, Electrical And Electronic Engineering Keywords: MnO; ZnO:Zn; Memristor; I-V Curves; Adaptive Electronics; Sustainable Electronics

Online: 5 April 2024 (06:43:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0409.v1

Verifying the Accuracy of 3D-Printed Objects Using an Image Processing System

Takuya Okamoto, Sharifu Ura

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: 3D printing; Computer-aided design, Metrology; Accuracy; Image processing; Error; Porous structure

Online: 5 April 2024 (06:09:15 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0329.v1

Redundant Space Manipulator Autonomous Guidance for In-Orbit Servicing via Deep Reinforcement Learning

Matteo D’Ambrosio, Lorenzo Capra, Andrea Brandonisio, Stefano Silvestrini, Michèle Roberta Lavagna

Subject: Engineering, Aerospace Engineering Keywords: Deep Reinforcement Learning; 7-DoF space manipulator; motion synchronization; In-Orbit Servicing

Online: 4 April 2024 (17:28:29 CEST)

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Preprint REVIEW | doi:10.20944/preprints202404.0318.v1

Sensors and Sensing Devices Utilizing Electrorheological Fluids and Magnetorheological Materials – a Review

Yu-Jin Park, Seung-Bok Choi

Subject: Engineering, Mechanical Engineering Keywords: sensors; electrorheological fluid; magnetorheological materials; force sensor; tactile sensor; flux measurement sensor; strain sensor

Online: 4 April 2024 (15:58:42 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0317.v1

Drag Reduction by Dried Malted Rice Solutions in Pipe Flow

Keizo Watanabe, Satoshi Ogata

Subject: Engineering, Bioengineering Keywords: drag reduction; friction factor; velocity profile; biopolymer solutions

Online: 4 April 2024 (15:57:41 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0310.v1

Experimental Procedure to Study the High Speed Orthogonal Cutting of Unidirectional GFRP

Martina Panico, Luca Boccarusso, Antonio Formisano, Giuseppe Villani, Antonio Langella

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: orthogonal cutting; composite materials; cutting forces; burr; chip morphology

Online: 4 April 2024 (15:54:52 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0305.v1

Assessing the Sound and Heat Insulation Characteristics of Nonwoven Composite Structures: Evaluation of Polypropylene (PP)/Polybutylene Terephthalate (PBT) Meltblown, Polyamide Nanofiber Inner Layers and Recycled Polyester (r-PET) Thermo Bonded Outer

Emel ÇİNÇİK, Eda ASLAN

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: sound/acoustic insulation; heat insulation; meltblown nonwovens; polypropylene; polybutylene therephthalate; recycled polyester; electrospun nano fiber

Online: 4 April 2024 (15:53:48 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0385.v1

Implementation of Regenerative Thermal Oxidation Device Based on High Heating Device for Low-Emission Combustion

Hoon Min Park, HYUN-MIN JUNG, Dae Hee Lee, Joon-Seong Lee, DAL-HWAN YOON, Dong Hwan Jeon, TAE-YEUNG LIM

Subject: Engineering, Electrical And Electronic Engineering Keywords: low-emission combustion; high-heating device; VOC reduction; waste heat recovery; combustion chamber

Online: 4 April 2024 (15:43:32 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0376.v1

Precise Inverse Kinematic Calculation of the Center of Gravity for Bipedal Walking Robots

İsmail Hakkı Şanlıtürk, Hikmet Kocabaş

Subject: Engineering, Mechanical Engineering Keywords: bipedal robot, dynamic walking, open-loop

Online: 4 April 2024 (15:38:08 CEST)

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Preprint TECHNICAL NOTE | doi:10.20944/preprints202404.0323.v1

Suction-Controlled Ring Shear Test of the Silt and Concrete Interface

Yonghui Li, Jiawang Yang, Xin Li, Xiaotian Jiang

Subject: Engineering, Civil Engineering Keywords: unsaturated silt; suction control; ring shear test; interface roughness; shear strength

Online: 4 April 2024 (09:10:57 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0340.v1

Evaluation of the Impact of Design Parameters on the Acoustic Environment Perceived by Primary Students

Constanza Ipinza-Olatte, Beatriz Piderit-Moreno, Maureen Trebilcock-Kelly

Subject: Engineering, Architecture, Building And Construction Keywords: acoustics; learning space; occupant comfort; acoustic design; noise annoyance

Online: 4 April 2024 (06:02:43 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0342.v1

Cross-Layer Optimization for Enhanced IoT Connectivity: A Novel Routing Protocol for Opportunistic Networks

Ayman Khalil, Besma Zeddini

Subject: Engineering, Telecommunications Keywords: cross-layer; message delivery; probabilistic routing; history-based algorithm

Online: 4 April 2024 (05:59:39 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0212.v1

Functional Combination Based Comprehensive Benefit Evaluation of Energy Storage Projects under Source-grid-load Scenarios via Super Efficiency DEA

Hong Qu, Ze Ye

Subject: Engineering, Electrical And Electronic Engineering Keywords: energy storage projects; comprehensive evaluation; functional combination; super efficiency DEA; intuitionistic trapezoidal fuzzy number

Online: 4 April 2024 (02:29:24 CEST)

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Preprint REVIEW | doi:10.20944/preprints202404.0205.v1

An Analysis of Romania’s Energy Strategy: Perspectives and Developments since 2020

Alexandru Mihai Bulmez, Alin Ionuț Brezeanu, George Dragomir, Gabriel Năstase

Subject: Engineering, Energy And Fuel Technology Keywords: energy strategy; renewable energy sources; energy production; energy consumption; energy policy; Romania

Online: 4 April 2024 (02:27:56 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0319.v1

A New Type of Hydraulic Clutch with Magnetorheological Fluid: Theory and Experiment

Karol Musiałek, Ireneusz Musiałek, Karol Osowski, Artur Olszak, Aneta Mikulska, Zbigniew Kȩsy, Andrzej Kęsy, Seung-Bok Choi

Subject: Engineering, Mechanical Engineering Keywords: Keywords: magnetorheological fluid (MR); hydraulic clutch operating with MR fluid; rotating magnetic field; rotational speed; particle sizes

Online: 3 April 2024 (16:19:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0249.v1

Effect of Vehicle Cyclic Loading on the Failure of Canal Embankment on Soft Clay Deposit

Kuo Chieh Chao, Tanawoot Kongsung, Krit Saowiang

Subject: Engineering, Civil Engineering Keywords: instability; soft clay; triaxial; rapid drawdown; vehicle cyclic loading; finite element method (FEM); excess pore water pressure; threshold stress; threshold strain; undrained shear strength; monotonic strain

Online: 3 April 2024 (16:07:33 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0311.v1

A non-destructive monitoring method for chlorophyll content of potato plants based on feature reconstruction algorithm

Yaohua Hu, Huanbo Yang, Xiaoyi Shi, Kaili Zhang, Taifeng Guo

Subject: Engineering, Mechanical Engineering Keywords: chlorophyll content estimation; UAV- based multispectral images; NDRE; PCA3 and INDRE.

Online: 3 April 2024 (15:34:08 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0227.v1

Industrialization in Construction Companies – a Benchmark Study on Manufacturing Companies

Solmaz Mansoori, Janne Härkönen, Harri Haapasalo, Petteri Annunen

Subject: Engineering, Architecture, Building And Construction Keywords: predefined products; predefined processes; data management; industrialized construction

Online: 3 April 2024 (13:15:17 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0298.v1

Nighttime Harvesting of OrBot (Orchard roBot)

Jakob Waltman, Ethan Buchanan, Duke M Bulanon

Subject: Engineering, Control And Systems Engineering Keywords: Apple harvesting; machine vision; robotics

Online: 3 April 2024 (12:58:02 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0289.v1

A Novel Microfluidics Droplet-Based Interdigitated Ring-Shaped Electrode Sensor for Lab-on-a-Chip Applications

Salomao Moraes da Silva Junior, Luiz Eduardo Bento Ribeiro, Fabiano Fruett, Johan Stiens, Jacobus Willibrordus Swart, Stanislav Moshkalev

Subject: Engineering, Electrical And Electronic Engineering Keywords: Microfluidics devices, Droplet-based Microfluidics, Lab-On-a-Chip sensor, Interdigitated electrodes, Spectroscopic Sensing, Real-time, Microfabrication and Soft Lithography.

Online: 3 April 2024 (12:22:22 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0271.v1

Research on Driving Scenario Knowledge Graphs

Ce Zhang, Liang Hong, Dan Wang, Xinchao Liu, Jinzhe Yang, Yier Lin

Subject: Engineering, Automotive Engineering Keywords: intelligent traffic; knowledge graph; hybrid methods; driving scenarios; ontology

Online: 3 April 2024 (11:27:26 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0260.v1

Multivariate Hydrologycal Modelling based on Long Short Term Memory Networks for Water Level Forecasting.

Jackson B. Renteria - Mena, Douglas Plaza, Eduardo Giraldo

Subject: Engineering, Electrical And Electronic Engineering Keywords: Multivariate hydrological modeling, Time series analysis, Water level forecasting, ; LSTM.

Online: 3 April 2024 (11:08:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0285.v1

Characterizing Edible Oils by Oblique-Incidence Reflectivity Difference Combined with Machine Learning Algorithms

Xiaorong Sun, Yiran Hu, Cuiling Liu, Shanzhe Zhang, Sining Yan, Xuecong Liu, Kun Zhao

Subject: Engineering, Safety, Risk, Reliability And Quality Keywords: Oblique-incidence reflectivity difference; Edible oils; Machine learning; Feature importance scores

Online: 3 April 2024 (10:35:52 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0282.v1

Green-Powered Electric Public Mobility: Integrating Urban and Interurban Routes – A Case Study Analysis

Alessandro Franco, Giovanni Lutzemberger, Marco Giorgio Bevilacqua, Francesco Giuseppe Quilici, Matilde Vezzani

Subject: Engineering, Transportation Science And Technology Keywords: Electrification; Renewable energy integration; Public transit; Photovoltaic systems; Sustainable urban development; Energy independence; Modular solution.

Online: 3 April 2024 (10:34:08 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0284.v1

Continuous Time Simulation and System Level Control Model of a Modern MVDC Distribution Grid including SST and MMC Based AFE

Daniel Siemaszko, Mauro Carpita

Subject: Engineering, Electrical And Electronic Engineering Keywords: DC distribution systems; Power systems simulation; Power distribution control; Power system planning,; Pulse Width Modulation; Modular Multilevel Converter (MMC); Solid State Transformer

Online: 3 April 2024 (10:00:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0229.v1

Numerical Coupling between a FEM Code and the FVM Code OpenFOAM by Using the MED Library

Sandro Manservisi, Giacomo Barbi, Antonio Cervone, Federico Giangolini, Lucia Sirotti

Subject: Engineering, Energy And Fuel Technology Keywords: CFD; Code coupling; Conjugate Heat Trasfer

Online: 3 April 2024 (08:09:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202403.1856.v1

A BIM-Based Bar Bending Schedule Generation Algorithm With Enhanced Accuracy

Lwun Poe Khant, Daniel Darma Widjaja, Kee-Hoon Kwon, Sunkuk Kim

Subject: Engineering, Civil Engineering Keywords: BIM; rebar work; bar bending schedule; special length; automation

Online: 3 April 2024 (05:55:08 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0165.v1

Research on Corrosion Detection Method of Oil Tank Bottom Based on Acoustic Emission Technology

Weixing Hua, Yan Chen, Xiang Zhao, Jiping Yang, Han Chen, Zhaojie Wu, Gang Fang

Subject: Engineering, Energy And Fuel Technology Keywords: Acoustic emission technology; Oil storage tank; Corrosion; Detection

Online: 2 April 2024 (16:23:02 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0153.v1

Trend Research of Maritime Autonomous Surface Ships (MASS) based on Shipboard Electronics: Focusing on Text Mining and Network Analysis

Jinsick Kim, Sungwon Han, Hyeyoung Lee, Byeongsoo Koo, Moonju Nam, Kukjin Jang, Jooyeoun Lee, Myoungsug Chung

Subject: Engineering, Transportation Science And Technology Keywords: Maritime Autonomous Surface Ships (MASS), Research trends, Text Mining, Latent Dirichlet allocation (LDA) topic modeling, Shipboard Electronics, Shipping industry

Online: 2 April 2024 (16:16:15 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0160.v1

Optimal Selection of Distribution, Power and Type of Luminaires for Street Lighting Designs Using Multi-criteria Decision

Nataly Gabriela Valencia Pavón, Alexander Aguila Téllez, Edwin Marcelo Garcia, Javier Arturo Rojas Urbano, Narayanan K

Subject: Engineering, Electrical And Electronic Engineering Keywords: Public lighting; Multi-criteria decision; CRITIC method; Optimization

Online: 2 April 2024 (16:01:01 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0226.v1

Design and Analysis of a Novel Non-isolated DC-DC Modular Multilevel Converter Architecture for High Voltage Direct Current Power Networks Interconnections

Abdurrahim Erat, Ahmet Mete Vural

Subject: Engineering, Electrical And Electronic Engineering Keywords: HVDC; DC-DC Power Conversion; MMC; DC-DC MMC; Asynchronous Power Grids

Online: 2 April 2024 (15:49:58 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0181.v1

Signal-Injection-Based Topology Identification for Low-Voltage Distribution Networks Considering Missing Data

Yilong Duan, Zheng Liu, Yuanyuan Liu, Yong Li

Subject: Engineering, Electrical And Electronic Engineering Keywords: topology identification; low-voltage distribution network; signal injection

Online: 2 April 2024 (12:55:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0060.v1

Structural Optimization in Building Information Modeling (BIM) Projects Using Visual Programming, Evolutionary Algorithms, and Sustainability Assessment Tools

Feyzullah Yavan, Reza Maalek, Vedat Toğan

Subject: Engineering, Architecture, Building And Construction Keywords: Structural Optimization; Genetic Algorithm; Parametric Design; Visual Programming; Generative Modeling

Online: 2 April 2024 (12:41:38 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0209.v1

A Single Buyer Model of Imbalance Cost Pass-Through Pricing Forecasting under Malaysia Electricity Supply Industry

Fatin Khairunnisa Khairuddin, Farah Anishah Zaini, Mohamad Fani Sulaima, Nur Hazahsha Shamsudin, Mohd Shahrin Abu Hanifah

Subject: Engineering, Electrical And Electronic Engineering Keywords: Electricity price; Incentive Based Regulation; Electricity Market; Forecasting; Time Series; Machine Learning

Online: 2 April 2024 (12:34:22 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0084.v1

Thermochemical Transformation of Municipal Household Solid Waste Fractions into Bio-Oils and Bio-Adsorbents

Higor Ribeiro Borges, Fernanda Paula da Costa Assunção, Diogo Oliveira Pereira, Lauro Henrique Hamoy Guerreiro, Simone Patrícia Aranha Da Paz, Marcelo Costa Santos, Onésimo Amorim Corrêa, Jorge Fernando Hungria Ferreira, Douglas Alberto Rocha De Castro, Isaque Wilkson De Sousa Brandão, Neyson Martins Mendonça, José Almir Rodrigues Pereira, Marta Chagas Monteiro, Sergio Duvoisin, Jr., André Oliveira Menezes, Luiz Eduardo Pizarro Borges, Nélio Teixeira Machado

Subject: Engineering, Energy And Fuel Technology Keywords: MSW; Organic fractions of MSW, Thermochemical process; Characterization of biochar and bio-oil

Online: 2 April 2024 (12:25:15 CEST)

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This work aims to investigate the effect of process temperature and catalyst content by thermochemical degradation of municipal solid waste (MSW) fraction (organic matter + paper + plastic) on the yield of reaction products (bio-oil, biochar, H2O and gas), physicochemical properties and chemical composition of bio-oils, as well as on the morphology and crystalline phases of biochar in laboratory scale. The organic matter, paper and plastic segregated from the gravimetric composition of total waste sample were subjected to the pre-treatments of drying, crushing and sieving. The experiments were carried out at 400, 450 and 475 °C and 1.0 atmosphere, and at 450 °C and 1.0 at-mosphere, using 5.0, 10.0 and 15.0% (wt.) of FCC zeolite, bath mode, using a laborato-ry scale glass reactor. The bio-oil was characterized for acidic value. The chemical functions present in the bio-oil identified by FT-IR and the composition by GC-MS. Biochar was characterized by SEM/EDS and XRD. Thermal pyrolysis of the MSW frac-tion (organic matter + paper + plastic) shows bio-oil yields between 9.44 and 9.24% (wt.), aqueous phase yields between 21.93 and 18.78% (wt.), solid phase yields between 67.97 and 40.34% (wt.) and gas yields between 28.27 and 5.92% (wt.). The yield of bio-oil decreases with increasing process temperature. For the experiments using FCC, the biochar and gas yields increase slightly with the FCC content, while that of bio-oil de-creases and the H2O phase remains constant. The GC-MS of bio-oils identified the presence of hydrocarbons and oxygenates, as well as nitrogen-containing compounds, including amides and amines. The acidity of the bio-oil increased with increasing temperature and with the aid of FCC as a catalyst. It has been identified the presence of hydrocarbons within bio-oil by addition of FCC catalyst due to the deoxygenation of carboxylic acids, followed by decarboxylation and decarbonylation reactions, producing aliphatic and aromatic hy-drocarbons.

Preprint REVIEW | doi:10.20944/preprints202404.0208.v1

Review of Joint Radar, Communication, and Integration of Beam-forming Technology

KHURSHID HUSSAIN, INN-YEAL OH

Subject: Engineering, Automotive Engineering Keywords: Physical security; Communications; Beam-forming; Radar; MIMO

Online: 2 April 2024 (12:23:08 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0196.v1

Towards High Lift-Off Non-contact Railway Track Crack Detection with Eddy Current Sensor Array Technology

Yuchun Shao, Zihan Xia, Yiqing Ding, Bob Crocker, Scott Saunders, Anthony Peyton, Daniel Conniffe, Wuliang Yin

Subject: Engineering, Electrical And Electronic Engineering Keywords: eddy current testing; electromagnetic induction; planar structure; theoretical calculation; measurement

Online: 2 April 2024 (12:19:56 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0145.v1

Conceptual Design of an Unmanned Electrical Amphibious Vehicle for Ocean and Land Surveillance

Hugo Policarpo, João P. B. Lourenço, António M. Anastácio, Rui Parente, Francisco Rego, Daniel Silvestre, Frederico Afonso, Duarte M. S. Albuquerque, Nuno M. M. Maia

Subject: Engineering, Mechanical Engineering Keywords: Vehicle, Amphibious, Unmanned, Electric vehicle, Conceptual design, Surveillance

Online: 2 April 2024 (10:45:19 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0192.v1

Explicit Numerical Study on Dynamic Behavior of Threadbar under Impact Loading

L.Y. Marulanda, J.A. Vallejos, J.I. Velásquez

Subject: Engineering, Mining And Mineral Processing Keywords: Rockbursts; Threadbar; Dynamic testing; Numerical modelling; energy absorption

Online: 2 April 2024 (10:26:04 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0179.v1

Performance Analysis of Six Electro-Optical Crystals in a High-Bandwidth Traveling Wave Mach-Zehnder Light Modulator

Abtin Ataei, Paul McManamon, Andrew Sarangan

Subject: Engineering, Electrical And Electronic Engineering Keywords: modulators; waveguide; COMSOL; electro-optical crystals; traveling wave; lumped elements; propagation constant; Pockels effect; numerical simulation

Online: 2 April 2024 (09:48:18 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0138.v1

Design and Optimization of Electrical Parameters of Perovskites-based Thin Film Solar Cell

Muhammad Muneeb Khan, Sadiq Ahmad, Ali Hassan, And Furqan Shaukat

Subject: Engineering, Energy And Fuel Technology Keywords: Electrical Parameters; Perovskite; Optimization; Renewable Power; SCAPS-1D; PVSyst; Solar Module; Solar Cell

Online: 2 April 2024 (09:25:09 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0140.v1

Design of an Axial-type Magnetic Gear with Auxiliary Flux-enhancing Structure

Fang Li, Hang Zhao, Xiangdong Su

Subject: Engineering, Electrical And Electronic Engineering Keywords: Axial magnetic gear; permanent-magnet machine; flux-enhancing effect; mapping relation; parameter optimization

Online: 2 April 2024 (09:23:32 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0180.v1

Investigating the Performance and Longevity of Lithium-ion Batteries in Grid-Scale Energy Storage Applications

Areej Alqarni

Subject: Engineering, Electrical And Electronic Engineering Keywords: Lithium-ion batteries; Grid-scale energy storage; Battery longevity; Renewable energy integration

Online: 2 April 2024 (08:56:48 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0163.v1

Correlation Analysis of Tunnel Deformation and Internal Force in the Earthquake Based on Tunnel Inclination

Zhiyong Yang, Yin Liu, Can Chen

Subject: Engineering, Civil Engineering Keywords: Dynamic time history; seismic response; relative displacement; tunnel inclination

Online: 2 April 2024 (08:53:10 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0152.v1

Enhancing Lubricating Oil Performance through the Integration of Viscosity Improvers in Mono-Grade and Multi-grade Blends

NNADIKWE JOHNSON, IHEME CHIGOZIE

Subject: Engineering, Chemical Engineering Keywords: Mono-Grade; Multi-Grade; Blends; Temperature; Lubricants; Quality; Product

Online: 2 April 2024 (08:53:06 CEST)

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ABSTRACT Lubricants play a crucial role in reducing friction and wear between surfaces in relative motion. Engine oil, as a lubricant, is specifically designed to minimize friction and wear between the moving parts of different equipment and machinery. Engine oil blending serves the purpose of adjusting the variety of lubricants available to meet specific performance requirements. Through blending, it is possible to tailor the characteristics of the lubricating oil, such as viscosity, stability, and additive content, to optimize its effectiveness in reducing friction, protecting engine components, and enhancing overall equipment performance. By customizing lubricant formulations through blending, manufacturers can address the diverse lubrication needs of modern engines and machinery, ensuring smooth operation, longevity, and efficiency.To enhance the quality of the lubricant and achieve the desired high-performance multi-grade engine oil, a systematic approach was followed. The process began with testing the specific gravity of the oil using a hydrometer and thermometer to ensure accurate measurements. Subsequently, 5 liters of base oil were carefully measured and poured into a stainless steel reactor pot to serve as the blending vessel. Following this, 1 liter of paraffin oil (100N) was added to the base oil to introduce specific properties to the blend. To further optimize the formulation, 0.42 kg (7% of the total blend) of additives, including a selection of specific performance-enhancing compounds, was incorporated. These additives, such as Aspen, Tackifier, and other essential components like anti-wear, corrosion inhibitors, detergents, dispersants, and antioxidants, were meticulously measured and added to the mix. Through this precise blending process, the goal was to craft a high-quality multi-grade engine oil that meets the stringent performance requirements for various operating conditions and equipment types. After the melted Aspen and dissolved tackifier were added to the mixture, thorough stirring was carried out to ensure uniform distribution until a homogeneous blend was achieved. The mixture was then exposed to heat to facilitate the reaction between the base oil and additives, reaching a temperature of 70°C for optimal blending. Subsequently, 0.5 kg of viscosity index improver was introduced into the mixture and stirred continuously for a period of 5 minutes to ensure proper integration. Following this step, 5 grams of dye were carefully added to the mixture, and stirring was continued to evenly disperse the coloring agent throughout the blend. This meticulous process aimed to ensure that all components were effectively incorporated, facilitating the production of a high-quality, customized multi-grade engine oil with enhanced performance characteristics and optimal lubricating properties. After subjecting the mixture to a temperature of 70°C, the heat source was removed, allowing the product to gradually cool down to room temperature, which was estimated to be around 30°C. Following this cooling process, the product underwent a filtration step to remove any residual impurities present in the mixture. A sample of the purified product was then extracted for further analysis. Quality control tests were meticulously carried out on the sample to ensure that the product met the rigorous standards set by the Standard Organization of Nigeria (SON). The results obtained from the quality control tests were highly promising, indicating that the product indeed complied with the stringent specifications outlined by the regulatory body. This adherence to quality standards is essential in ensuring the product's reliability and performance in various applications. The successful outcome of the quality control test underscores the meticulous attention to detail and commitment to excellence in the production process. The rigorous quality control procedures implemented in the analysis of the product highlight the commitment to upholding high standards of quality and safety in the manufacturing process. By consistently meeting and exceeding industry regulations and standards, the product not only demonstrates its reliability but also reflects a dedication to customer satisfaction and product excellence. The adherence to the SON standards showcases a commitment to producing top-quality products that meet the needs and expectations of consumers and industry stakeholders alike.

Preprint ARTICLE | doi:10.20944/preprints202404.0144.v1

Maximum Reliability for multi-UAV Cooperation Relay Systems

Ning Ning, Zhou Suiping, Bao Weimin, Li Xiaoping

Subject: Engineering, Telecommunications Keywords: UAV relaying platform; air ground communication; Line-of-Sight; path loss; bit error rate

Online: 2 April 2024 (08:26:56 CEST)

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Preprint REVIEW | doi:10.20944/preprints202404.0121.v1

Analysis and Applications of the Two Phases Closed Thermosyphon Technology in the Highways in Permafrost Regions: A Review

Shuai Du, Zeliang Ye

Subject: Engineering, Civil Engineering Keywords: ; Two-phase closed thermosyphon technique; Permafrost region; Analysis; Applications

Online: 2 April 2024 (07:51:13 CEST)

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Preprint REVIEW | doi:10.20944/preprints202404.0147.v1

Energy Efficiency Trends in the Built-Environment Globally and in Egypt: A Literature Review

Habiba Aly, Omar Abdelaziz

Subject: Engineering, Architecture, Building And Construction Keywords: buildings; energy efficiency; design guides; rating systems; Egypt; review

Online: 2 April 2024 (07:28:19 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0139.v1

Continuous Power Management of Decentralized DC Microgrid Based on Transitional Operation Modes under System Uncertainty and Sensor Failure

Seong-Bae Jo, Dat Thanh Tran, Muhammad Alif Miraj Jabbar, Myungbok Kim, Kyeong-Hwa Kim

Subject: Engineering, Electrical And Electronic Engineering Keywords: continuous power management; decentralized DC microgrid; sensor failure; system uncertainty; transitional operation modes

Online: 2 April 2024 (07:19:06 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0164.v1

Determination of Critical Damage Size of Inclined Waterproof Coal Pillar under Asymmetric Load

Xingping Lai, Xiaoqian Yuchi, Helong Gu, Pengfei Shan, Wenhua Yang

Subject: Engineering, Mining And Mineral Processing Keywords: Inclined coal seam; Asymmetric loading; Waterproof coal pillar; Critical size

Online: 2 April 2024 (05:35:59 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0095.v1

Bladder Reconstruction in Cats Using in Body Tissue Architecture (iBTA)-Induced Biosheet

Naoki Fujita, Fumi Sugiyama, Masaya Tsuboi, Hazel Nakamura, Ryohei Nishimura, Yasuhide Nakayama, Atsushi Fujita

Subject: Engineering, Bioengineering Keywords: in body tissue architecture (iBTA); cat; urinary tract reconstruction

Online: 2 April 2024 (03:08:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0113.v1

Five-Axis Finish Milling Machining for an Inconel 718 Alloy Monolithic Blisk

Ming-Hsu Tsai, Teng-Hui Chen, Jeng-Nan Lee, Tai-Lin Hsu, Dong-Ke Huang

Subject: Engineering, Mechanical Engineering Keywords: Monolithic blisk; Five-axis machining; Machining parameter; Tool wear

Online: 2 April 2024 (03:08:26 CEST)

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Preprint REVIEW | doi:10.20944/preprints202404.0106.v1

Recent Advances of Conductive Hydrogels for Flexible Electronics

Jingyu Wang, Bao Yang, Zhenyu Jiang, Yiping Liu, Licheng Zhou, Zejia Liu, Liqun Tang

Subject: Engineering, Electrical And Electronic Engineering Keywords: Conductive hydrogel; Mechanical strength; Tissue engineering; Flexible electronics

Online: 2 April 2024 (03:08:06 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0083.v1

Potential for Recycling Metakaolin-Slag Based Geopolymer Concrete of Various Strength Levels in Freeze-Thaw Conditions

Mengtong Liu, Hui Liu, Minqi Hua, Chunhong Chen, Xinjie Wang, Xiang Guo, Tianyu Ma

Subject: Engineering, Civil Engineering Keywords: Geopolymer concrete; Recycling potential; Strength levels; Freeze-thaw resistance; Recycled geopolymer aggregates; Physical properties

Online: 2 April 2024 (02:50:11 CEST)

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Preprint TECHNICAL NOTE | doi:10.20944/preprints202404.0072.v1

Development of a Variable-Rate Spraying System for Small Amounts of Liquid Rhizobial Inoculation Based on Increment PID Control

Jicheng Zhang, Yushuo Hou, Ping Zheng, Wenyi Ji, Shouyin Hou, Shichao Yan, Chenghao Kang

Subject: Engineering, Electrical And Electronic Engineering Keywords: precision agriculture; liquid rhizobial inoculation; spraying and control system; incremental PID control algorithm

Online: 2 April 2024 (02:19:43 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0097.v1

Decline in Sensory Integration in Old Age: Evidence from a Virtual Reality Task, and Its Functional Brain Connectivity Correlates

Satoru Inagaki, Hirokazu Matsuura, Kazuki Sakurai, Ludovico Minati, Natsue Yoshimura

Subject: Engineering, Bioengineering Keywords: sensory integration; aging; rsFC; reaching task; virtual reality

Online: 1 April 2024 (17:24:45 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0077.v1

Enhancing Sustainable Construction: Optimization Tool for Glulam Roof Structures according to Eurocode 5

María Simón-Portela, José Ramón Villar-García, Pablo Vidal-López, Desirée Rodríguez-Robles

Subject: Engineering, Architecture, Building And Construction Keywords: artificial intelligence; genetic algorithm; timber; roof structure; Eurocode 5

Online: 1 April 2024 (17:18:38 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0102.v1

Subgrid Turbulent Flux Models for Large Eddy Simulations of Diffusion Flames in Space Propulsion

Daniel Martinez-Sanchis, Andrej Sternin, Sagnik Banik, Oskar Haidn, Martin Tajmar

Subject: Engineering, Aerospace Engineering Keywords: Large Eddy Simulation; Turbulence; Combustion; Methane; Propulsion

Online: 1 April 2024 (15:04:25 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0098.v1

Raman Analysis of Deposition Pressure Variations in Nanocomposite SiCN Coatings: A 4-Stage Model

Arnab Bhattacharyya

Subject: Engineering, Metallurgy And Metallurgical Engineering Keywords: Si-C-N; Nanocomposite coatings; crystallization; sputtering; nanomechanical

Online: 1 April 2024 (15:03:28 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0101.v1

Research on Sound Source Localisation Method for UAV Detection Based on Improved EMD

Tao CHEN, Jiyan YU, Zhengpeng YANG

Subject: Engineering, Mechanical Engineering Keywords: sound source localisation; EMD dynamic modal decomposition method; signal processing; feature extraction; Chan-Taylor algorithm

Online: 1 April 2024 (14:46:43 CEST)

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Abstract In order to solve the problem that it is difficult to obtain the accurate trigger signal moment when using the time difference of UAV flight acoustic signals collected by acoustic sensors arranged in advance to locate the position of UAVs when they cannot be tracked by radar and are difficult to be observed by the human eye, an acoustic source localisation method with improved empirical modal decomposition (REMD) under an adaptive frequency window is proposed. Firstly, the collected UAV flight signals are smoothed and filtered, then the robust empirical modal decomposition (REMD) is used for IMF modal decomposition and spectral analysis of the collected signals, and a panning frequency window with variable bandwidth is introduced for corresponding frequency locking and extracting the IMFs; the GWO optimisation is used and the sliding metrics are set to determine the position of the panning frequency window automatically; finally, the extracted Finally, the extracted IMF components are reconstructed according to the criterion, and the trigger signal moments in the reconstructed IMF components are resolved and recorded, and the algorithm is used to calculate the difference between the reception moments of different sensors; for the traditional sound source localisation algorithms with a small detection range, which are prone to fall into the no-solution or false-solution, i.e., unable to achieve the localisation, a weighted least-squares-based Chan-Taylor algorithm is proposed for the localisation computation, and a weighted least-squares algorithm is proposed for the localisation computation, through the Inputting the sensor delay parameter and solving the linear equation system to get the target position information; finally, this paper verifies the robustness and performance of the design method with simulated and actual signals. The results show that the maximum positioning error is no more than 5% in an area with a side length of 15m in the measurement area. With the improved accuracy of time delay estimation, the positioning simulation results meet the positioning requirements even though the positioning error is further expanded when the measurement area is further expanded.

Preprint ARTICLE | doi:10.20944/preprints202404.0090.v1

Microstructure and Shear Mechanical Properties of Fractured Rock Mass Reinforced by Aeolian-Sand (AS) Cement Mortar after Freeze-Thaw (F-T) Cycles

Yang Liu, Shiguan Chen, Jiafan Zhang, Huimei Zhang

Subject: Engineering, Civil Engineering Keywords: Aeolian-sand (AS) cement mortar; Freeze-thaw (F-T) cycles; Grout-rock interface; Nuclear magnetic resonance (NMR); Shear mechanical property

Online: 1 April 2024 (14:40:36 CEST)

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The rock joint fissure slope in cold regions is prone to deformation and failure problems such as relaxation, tension and collapse under freeze-thaw (F-T) cycles. Based on the ideology of clean production and promoting the structural integrity of geotechnical projects in cold areas, this study designed and prepared aeolian-sand (AS) to replace part of river sand as a filling mortar material by taking advantage of the low cost and easy availability of AS. Investigations were carried out to determine the impact of varying proportions of AS in mortar on the microstructure and shear properties of the mortar-rock interface under F-T cycles. Therefore, F-T cycle testing, nuclear magnetic resonance (NMR) testing and shear testing were carried out on grout with different proportions of AS. The results show that the right proportion of AS replacement could enhance the shear deformation resistance and F-T resistance of the mortar-rock interface, and 30% proportion is the optimal proportion. By increasing of F-T cycles, the three types of specimens showed different degrees of particle spalling, shedding and cracking. The slurry-rock interface layer in the A (0%) group exhibited the most severe F-T deterioration, while the B (15%) group showed a lesser degree, and the C (30%) group performed the best. T2 spectrum curve and total spectrum area change law from the microscopic point of view to verify the 30% AS proportion mortar-rock interface F-T resistance is the strongest, followed by 15% AS proportion mortar, the weakest is ordinary mortar. The degradation of the mortar-rock bond is primarily due to the conversion of solid to liquid phases and the movement of internal water caused by fluctuating temperatures. The extent of F-T deterioration in the slurry-rock interface layer is greatly affected by the varying proportions of AS. The shear strength and shear stiffness of specific proportion of AS decreased with the increase of F-T cycles. For same F-T cycles, the shear strength and shear stiffness of group C (30%) were the highest, followed by group B (15%) and group A (0%). The grout material not only reinforces the F-T joint fissure slope, but also reduces the cost of grout reinforcement and promotes the clean production of geotechnical structures.

Preprint ARTICLE | doi:10.20944/preprints202404.0057.v1

Numerical Analysis of the Influence of Typical Perturbation Forces on LEO Satellites Orbit Prediction at Different Altitudes

Yang Zhang, Shengmao He, Chao Peng, Yuchang Xu, Deyong Xian, Ran Li, Guang Yang, Hong Yuan

Subject: Engineering, Aerospace Engineering Keywords: LEO constellations; Perturbation force; Gravitational field order; orbit prediction; Atmospheric density model

Online: 1 April 2024 (13:30:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0050.v1

Frictional Behavior of Chestnut (Castanea sativa Mill.) Sawn Timber for Carpentry and Mechanical Joints in Service Class 2

José Ramón Villar-García, Manuel Moya-Ignacio, Pablo Vidal-López, Desirée Rodríguez-Robles

Subject: Engineering, Architecture, Building And Construction Keywords: friction coefficient; tribology; mechanical properties; contact simulation; Eurocode 5

Online: 1 April 2024 (13:24:48 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0047.v1

On the Use of New 3D Modelization, Reconstruction and Printing Techniques to Improve the Metatarsophalangeal Cancerous Lesion Management

Basma Benchra, Fatimaezzehra Jaber, Zineb Farahat, Imane Hilal, Btihal El ghali, Bahia El Abdi, Mhamed Karrouch, Kawtar Megdiche, Nabil Ngote

Subject: Engineering, Bioengineering Keywords: Implant joint; Metatarso-Phalangeal joint; Bone Tumors; 3D Modelling; 3D reconstrcution; 3D Printing technologies

Online: 1 April 2024 (12:36:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0025.v1

Analysis of the Evolution of Water Quality in Tanks according to the Connections and Operation Mode. Application to the most Suitable Design

Marta Hervás, Fernando Martínez-Alzamora, Pilar Conejos

Subject: Engineering, Civil Engineering Keywords: Simulation; water quality; water age; storage tanks; hydraulic networks

Online: 1 April 2024 (10:33:25 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0016.v1

Physical and Thermochemical Properties of Selected Wood Species in Nigeria: A Fuel Suitability and Pelleting Potential Assessment

Suleiman Usman Yunusa, Satyanarayana Narra, Ebenezer Mensah, Kwasi Preko, Saleh Aminu

Subject: Engineering, Energy And Fuel Technology Keywords: Wood; pellets; energy; physical properties; thermochemical properties; standards

Online: 1 April 2024 (10:30:43 CEST)

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Preprint REVIEW | doi:10.20944/preprints202403.1885.v1

A review on alternative processes for green hydrogen production focused on generating hydrogen from biomass.

Aikaterina Paraskevi Damiri, Emmanuel Stamatakis, Spyridon Bellas, Emmanuel Zoulias, Georgios Mitkidis, Anestis G. Anastasiadis, Sotirios Karellas, Theocharis Tsoutsos, Athanasios K. Stubos, George Tzamalis

Subject: Engineering, Energy And Fuel Technology Keywords: Green hydrogen production; biomass; thermochemical treatment; biological treatment; electrochemical treatment

Online: 1 April 2024 (10:12:03 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0020.v1

Research on Aerodynamic Characteristics and Pitch Regulated Control Strategy of Coaxilcopter with Variable Rotor Spacing

Molei Zhao, Wei Wei, Zhifang Ke, Qingkai Meng, Jinghan Tu, Yongjie Shu, Haitao Zhang

Subject: Engineering, Aerospace Engineering Keywords: coaxilcopter; variable rotor space; aerodynamic performance; rotor interaction; flight control

Online: 1 April 2024 (10:04:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0036.v1

Chasing Optimization on Multimodal Transportation System: A Strategic Approach to Minimizing Costs and CO2 Emissions

Ivan Derpich, Claudia Duran, Raul Carrasco, Fabricio Moreno, Christian Fernandez-Campusano, Leonardo Espinosa-Leal

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: Hub and spoke; National logistic; Multimodal system; Emissions reduction

Online: 1 April 2024 (09:54:03 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202403.1878.v1

New Design Options for Container Barges with Improved Navigability on the Danube

Bianca Duldner-Borca, Laura Hoerandner, Bernhard Bieringer, Reza Khanbilverdi, Lisa-Maria Putz-Egger

Subject: Engineering, Transportation Science And Technology Keywords: barge design; navigability; low water level; container transport; naval architecture; CAD; Danube

Online: 1 April 2024 (07:26:49 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202403.1881.v1

Improving Speed Characteristics of High Torque Density Motors for Physical Human-Robot Interaction using Independent 3-Phase Winding Structure

Junghwan Park, Handdeut Chang

Subject: Engineering, Electrical And Electronic Engineering Keywords: High Torque Density Motor; Safe pHRI(physical Human-Robot interaction); Independent 3-phase; Motor Controller

Online: 29 March 2024 (16:18:57 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1875.v1

Economical Experimental Device for Evaluating Thermal Conductivity in Construction Materials under Limited Research Funding

Damien Ali Hamada FAKRA, Rijalalaina RAKOTOSAONA, Marie Hanitriniaina RATSIMBA, Mino Patricia RANDRIANARISON, Riad Benelmir

Subject: Engineering, Civil Engineering Keywords: construction; low-tech; low-cost; conductivity; thermal transfer; steady state

Online: 29 March 2024 (16:03:30 CET)

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African scientific research faces formidable challenges, particularly with limited access to state-of-the-art measurement instruments. The high cost associated with these devices presents a significant barrier for regional research laboratories, impeding their ability to conduct sophisticated experiments and gather precise data. This predicament not only hampers the individual laboratories but also has broader implications for the African scientific community and the advancement of knowledge in developing nations—the financial cost barrier considerably impacts the research quality of these laboratories. Reflection on technical and economical solutions needs to be quickly found to help these countries advance their research. In civil Engineering, the thermal conductivity property is the most important measurement for characterising heat transfer in construction materials. Existing devices (i.e., conductometers) in a laboratory are expensive (approximately 30,000 euros) and unavailable for some African laboratories. The study proposes a new and affordable device to evaluate thermal conductivity in construction materials. The method involves establishing a thermal flux between a heat source ( from the Joule effect provided by steel wool where a current is circulating) and a cold source (generated by ice cube) under steady-state conditions. The development of the cylindrical prototype is based on the comparative flux-meter method outlined in the measuring protocol of the ASTM E1225 standard document. Experiments were conducted on four distinct materials (polystyrene, wood, agglomerated wood, and rigid foam). The results indicate a correct correlation between the experimental values obtained from the newly developed prototype and the reference values found in the literature. For example, concerning the experimental polystyrene study, the detailed case analysis reveals a good correlation, with a deviation of only 4%. The percent error found falls within the acceptable range indicated by the standards recommendations of the ASTM E1225 standard, i.e., within 5% acceptable error.

Preprint ARTICLE | doi:10.20944/preprints202403.1879.v1

Influence of a Shaft Shoulder on the Torsional Load-Bearing Behaviour of Trochoidal Profile Contours as Positive Shaft–Hub Connections

Author: Masoud Ziaei, Marcus Selzer, Heiko Sommer

Subject: Engineering, Mechanical Engineering Keywords: shaft shoulder; form-fit shaft and hub connections; trochoidal profiled shafts; torsional loaded connection; fretting fatigue

Online: 29 March 2024 (15:43:06 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1869.v1

Optimal Scheduling of Off-Site Industrial Production in the Context of Distributed Photovoltaic

Sizhe Xie, Yao Li, Peng Wang

Subject: Engineering, Electrical And Electronic Engineering Keywords: Optimized scheduling; Distributed photovoltaic; LSTM neural network; Particle swarm

Online: 29 March 2024 (14:55:58 CET)

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