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Preprint ARTICLE | doi:10.20944/preprints202403.0646.v1

Pin-on-Plate vs. Pin-on-Disk Wear Tests: Theoretical and Numerical Observations on the Initial Transient Phase

Francesca Di Puccio, Andrea Di Pietro, Lorenza Mattei

Subject: Engineering, Mechanical Engineering Keywords: wear test; pin-on-plate; pin-on-disc; flat-on-disc; wear factor; Archard’ s wear law; wear predictive model

Online: 11 March 2024 (18:05:25 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0642.v1

Microstructural Approach Application for Morphological Changes Determination of Grape during Drying

Wijitha Senadeera, Jasmine Banks, Giuseppina Adiletta, Kate Brewer

Subject: Engineering, Other Keywords: Grape; drying; Micro-structure; SEM; Algorithm

Online: 11 March 2024 (17:58:37 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0656.v1

Assessment of Sustainable Mobility Patterns of University Students and Staff: Case of a LMIC

Stephen Kome Fondzenyuy, Isaac Ndumbe Jackai II, Steffel Ludivin Feudjio Tezong, Davide Shingo Usami, Brayan Gonzalez-Hernandez, Jean François WOUNBA, George NKENG ELAMBO, Luca Persia

Subject: Engineering, Transportation Science And Technology Keywords: mobility; travel choices; active modes; public transport; low- and middle-income countries

Online: 11 March 2024 (17:56:59 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0637.v1

Adaptive Control of Quadrotors in Uncertain Environments

Daniel Leitao, Rita Cunha, Joao M Lemos

Subject: Engineering, Control And Systems Engineering Keywords: Quadrotor control; adaptive control; reinforcement learning

Online: 11 March 2024 (13:57:45 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0639.v1

Finite Element Analysis of the Upsurge of Bifurcation during the Thinning Process of Large Semiconductor Wafers

Vincenzo Vinciguerra, Giuseppe Luigi Malgioglio, Marco Renna

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: Thinning process, Bifurcation, Buckling, Wafer, Warpage, Curvature, Finite Element Analysis (FEA), Simulations.

Online: 11 March 2024 (13:51:10 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0623.v1

A Demand-Side Response Optimization Method for Flexible Loads Considering the Benefits of Peak-to-Valley Smoothing

Sichen Shi, Peiyi Wang, Zixuan Zheng, Shu Zhang

Subject: Engineering, Electrical And Electronic Engineering Keywords: Demand response; Double-layer optimization; Peak-to-valley smoothing benefits; KKT conditions; Air conditioning load; Electric vehicle load

Online: 11 March 2024 (13:31:50 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0617.v1

Ubiquitous Gait Analysis through Footstep-Induced Floor Vibrations

Yiwen Dong, Hae Young Noh

Subject: Engineering, Civil Engineering Keywords: gait analysis; structural vibration; spatiotemporal parameter

Online: 11 March 2024 (13:26:59 CET)

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Quantitative analysis of human gait is critical for early discovery, progressive tracking, and rehabilitation of neurological and musculoskeletal disorders, such as Parkinson’s Disease, stroke, and Cerebral Palsy. Gait analysis typically involves estimating gait characteristics, such as spatio-temporal gait parameters and gait health indicators (e.g., step time, length, symmetry, and balance). Traditional methods of gait analysis involve the use of cameras, wearables, and force plates, but are limited in operational requirements when applied in daily life - such as direct line-of-sight, carrying devices, and dense deployment. This paper introduces a novel approach for gait analysis by passively sensing footstep-induced floor vibrations during walking using vibration sensors mounted on the floor surface. Our approach is non-intrusive, scalable, and perceived as more privacy-friendly, making it suitable for continuous gait health monitoring in daily life. We developed a floor vibration-based gait analysis framework to estimate various gait parameters that are used as standard metrics in medical practices, including temporal parameters (step, stride, stance, swing, double-support, single-support time) and spatial parameters (step length, width, angle, stride length), and extracts gait health indicators (cadence/walking speed, left-right symmetry, gait balance, initial contact types). The main challenge is that floor vibrations are distinct across different floor types. To address this challenge, our approach develops floor-adaptive algorithms to extract floor-specific features and is designed to be generalizable to various settings, including homes, hospitals, and eldercare facilities. We evaluate our approach through real-world walking experiments with 20 adults with 12,231 labeled gait cycles across concrete and wooden floors. Our results show 90.5% (RMSE 0.08s), 71.3% (RMSE 0.38m), and 92.3% (RMSPE 7.7%) accuracy in estimating temporal, spatial parameters, and gait health indicators, respectively.

Preprint ARTICLE | doi:10.20944/preprints202401.1962.v2

Analytical Solution of a Forced Vibrating Tube Transporting Fluid

Moussa Tembely

Subject: Engineering, Mechanical Engineering Keywords: Tube conveying fluid; forced vibration; Analytical solution

Online: 11 March 2024 (10:13:34 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0604.v1

Optimization of sensor placement for modal testing using machine learning

Todd W Kelmar, Maria Chierichetti, Fatemeh Davoudi

Subject: Engineering, Mechanical Engineering Keywords: modal testing; sensor placement; machine learning; finite element method; beam analysis

Online: 11 March 2024 (10:04:42 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0603.v1

Effect of Zinc and Severe Plastic Deformation on Mechanical Properties of AZ61 Magnesium Alloy

Song-Jeng Huang, Sheng-Yu Wu, Murugan Subramani

Subject: Engineering, Mechanical Engineering Keywords: AZ61 Magnesium Alloy; ECAP; heat treatment; Mechanical Properties; Corrosion resistance

Online: 11 March 2024 (09:48:08 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0546.v1

Multi-Time-Scale Energy Storage Optimization Configuration for Power Balance in Distribution Systems

Qiuyu Lu, Xiaoman Zhang, Yinguo Yang, Qianwen Hu, Guobing Wu, Yuxiong Huang, Yang Liu, Gengfeng Li

Subject: Engineering, Electrical And Electronic Engineering Keywords: energy storage planning; multiple time scales; power balance

Online: 11 March 2024 (09:31:50 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0558.v1

Investigations on Motion Responses of Suspended Submersible in Internal Solitary Wave Field

Zhenyang He, Wenbin Wu, Junrong Wang, Lan Ding, Qiangbo Chang, Yahao Huang

Subject: Engineering, Marine Engineering Keywords: ISW fluid field; Suspended submersible; Fluid-structure interaction; Motion response

Online: 11 March 2024 (09:00:23 CET)

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Preprint REVIEW | doi:10.20944/preprints202403.0167.v2

Review of Accurate Detection of Human Skin Tissue Temperature Based on Microwave Radiation Method

Jingtao Wu, Jie Liu

Subject: Engineering, Bioengineering Keywords: Microwave radiation diagnosis; accurate temperature measurement; pencil beam; correlated radiometer architecture; combining forward and inversion

Online: 11 March 2024 (07:01:23 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0575.v1

Corrosion Assessment and Classification in SPCC Steel Using Eddy Current Testing

Lian Xie, Prashanth Baskaran, Francisco Correa Alegria, Artur Lopes Ribeiro, Helena Geirinhas Ramos

Subject: Engineering, Electrical And Electronic Engineering Keywords: classification; corrosion; generative and discriminative models; traditional eddy current testing

Online: 11 March 2024 (05:42:13 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0574.v1

Life Cycle Assessment of Wheat Straw Pyrolysis With Volatiles Fraction Chemical Looping Combustion

Teresa Mendiara, Alberto Navajas, Alberto Abad, Tobias Pröll, Mikel Munárriz, Luis M. Gandía, Francisco García-Labiano, Luis Francisco De Diego Poza

Subject: Engineering, Chemical Engineering Keywords: Biomass pyrolysis; Chemical Looping Combustion; Life Cycle Assessment; Environmental Impacts; Carbon Footprint

Online: 11 March 2024 (05:41:05 CET)

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Preprint REVIEW | doi:10.20944/preprints202403.0485.v1

Continued Process Verification Monitoring: Optimizing Control Chart Design by Reducing the False Alarm Rate and Nuisance Signals

Naveenganesh Muralidharan, Thatsinee Johnson, Leyla Saeednia Rose, Mark Davis

Subject: Engineering, Bioengineering Keywords: CPV; Control Chart False Alarm Rate; Control chart skewness and Kurtosis; Control chart nuisance signal

Online: 8 March 2024 (15:31:28 CET)

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The Food and Drug Administration’s 2011 Process Validation Guidance and International Council for Harmonization Quality Guidelines recommend continued process verification (CPV) as a mandatory requirement for pharmaceutical, biopharmaceutical, and other regulated industries. As a part of product life cycle management, after process characterization in stage 1 and process qualification and validation in stage-2, CPV is performed as stage-3 validation during commercial manufacturing. CPV ensures that the process continues to remain within a validated state. CPV requires the collection and analysis of data related to critical quality attributes, critical material attributes, and critical process parameters on a minimum basis. Data is then used to elucidate process control regarding the capability to meet predefined specifications and stability via statistical process control tools. In statistical process control, control charts and Nelson rules are commonly used throughout the industry to monitor and trend data to ensure that a process remains in control. In the control chart, the mean value is taken as the center line, and 3σ limits are placed on either side of the center line. In CPV, manufactured lots are summarized, trended, and discussed at a cross-functional level at pre-defined intervals (either weekly, bi-weekly, or even monthly) based on the batch run rate. A cross-functional team assesses details regarding 1) violation frequency, 2) statistical strength of the signal, 3) violation magnitude and its impact on process or quality, and 4) any potential root causes for out-of-expectation or out-of-trend signals. The cross-functional team must analyze whether any signal identified by the control chart is reliable and must determine whether corrective action should be taken and justify the decision in the CPV meeting minutes based on statistical strength and reliability of the signal. However, basic control charts are susceptible to false alarms and nuisance alarms. Therefore, it is imperative to understand the assumptions behind control charts and the inherent false alarm rates for different Nelson rules. In this article, the authors have detailed the assumptions behind the usage of control charts, the rate of false alarms for different Nelson rules, the impact of skewness and kurtosis of a data distribution on the false alarm rate, and methods for optimizing control chart design by reducing false alarm rates and nuisance signals.

Preprint ARTICLE | doi:10.20944/preprints202403.0527.v1

Experimental Investigation of Thermoacoustics and High Frequency Combustion Dynamics with Band Stop Characteristics in a Pressurized Combustor

Mehmet Kapucu, Jim B.W. KOK, Artur K. Pozarlik

Subject: Engineering, Energy And Fuel Technology Keywords: Combustion; instability; flame transfer function; thermoacoustic

Online: 8 March 2024 (14:44:12 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0532.v1

Analysis of Factors Influencing Driver Yielding Behavior at Midblock Crosswalks on Urban Arterial Roads

Paramet Luathep, Pongsatorn - Pechteep, Sittha Jaensirisak, Nopadon Kronprasert

Subject: Engineering, Transportation Science And Technology Keywords: Driver yielding behavior; Midblock crosswalk; Pedestrian safety; Multinomial logistic regression.

Online: 8 March 2024 (14:21:16 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0520.v1

An Experimental Approach to Improve the Geometric Accuracy of Micro-features Fabricated by Stereolithography (SLA)

Francesco Giovanni Modica, Vito Basile, Irene Fassi

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: Additive Manufacturing; Stereolithography; Surface microtexturing; Micro-features; Micro-pores; Micro porous structures; Surface functionalization; Functionally graded materials.

Online: 8 March 2024 (13:19:53 CET)

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In this paper, we present an experimental procedure to enhance the dimensional accuracy of fabrication via Stereolithography (SLA) of features at the micro-scale. Using a custom benchmark part, deviations in feature dimensions (micro-pores diameters and depths) were detected and measured by confocal microscopy. Samples characterization and experimental observations allowed the identification of inaccuracy sources, mainly due to the laser beam scanning strategy and to the incomplete removal of uncured liquid resin in post-processing (i.e., IPA washing). As a technology baseline, the measured dimensional errors on pores diameters were up to -46%. A compensation method of the nominal laser spot diameter (85m) was defined and implemented resulting in relevant improvements in dimensional accuracy of 9.8% and 11.3% on full-open pores diameter and depth, respectively. Further investigation was performed on a customized test part to adjust the calibration procedure. The measurements revealed that the estimate of the laser beam spot size is 968m. Measurements on micro-pores having different sizes revealed that a constant compensation parameter (i.e., C=85, 96, 120m) is not fully effective at the micro-scale, where average errors still remain at -24%, -18.8%, and -16% for compensations equals to 85, 96 and 120m, respectively. A further experimental campaign allowed the identification of an effective nonlinear compensation law where the compensation parameter depends on the micro-feature size C= f (D). Results show a sharp improvement in dimensional accuracy on micro-pore fabrication, with errors consistently below +8.2%. The proposed compensation method can be extended for the fabrication of any micro-features without restrictions on the specific technology implementation. Concerning the inaccuracy introduced by the laser path, experimentation with a customized part allowed the optimization of the part orientation to reduce the errors and their differences along the X and Y machine axes.

Preprint ARTICLE | doi:10.20944/preprints202403.0508.v1

Delineating the ultra-low misorientation between the dislocation cellular structures in additively manufactured 316L stainless steel

FEI SUN, Yoshitaka Adachi, Kazuhisa Sato, Takuya Ishimoto, Takayoshi Nakano, Yuichiro Koizumi

Subject: Engineering, Metallurgy And Metallurgical Engineering Keywords: additive manufacturing; cellular structure; misorientation; transmission electron microscopy; transmission Kikuchi diffraction; electron backscatter diffraction

Online: 8 March 2024 (11:11:25 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0523.v1

A Step Forward Understanding Directional Limitations in Markerless Smartphone-based Gait Analysis

Pavol Martiš, Zuzana Košutzká, Andreas Kranzl

Subject: Engineering, Bioengineering Keywords: OpenCap; Markerless Gait Analysis; Directional Bias in Motion Analysis; Gait kinematics; Smartphone-based Motion Capture; Timed Up and Go (TUG) Test

Online: 8 March 2024 (11:04:15 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0525.v1

Identification of High-Order Nonlinear Coupled Systems Using a Data-Driven Approach

Rodolfo Daniel Velázquez-Sánchez, Jonathan Omega Escobedo-Alva, Raymundo Peña-García, Ricardo Tapia-Herrera, Jesús Alberto Meda-Campaña

Subject: Engineering, Control And Systems Engineering Keywords: Sparse identification of nonlinear dynamics; high-order systems; coupled dynamics.

Online: 8 March 2024 (11:02:48 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0503.v1

Computational Fluid Dynamics Methodology to Estimate the Drag Coefficient of Balls in Rolling Element Bearings

Yann Marchesse, Christophe Changenet, Fabrice Ville

Subject: Engineering, Mechanical Engineering Keywords: rolling element bearing; drag coefficient; computational fluid dynamics; energy efficiency

Online: 8 March 2024 (11:01:12 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0519.v1

Numerical Modelling of a Female Brain: Effect of the Dura Mater

Joana R Pinto, Sofia M Gonçalves, Fábio A. O. Fernandes, Gustavo Carmo, Matthew B. Panzer, Ricardo Alves de Sousa

Subject: Engineering, Mechanical Engineering Keywords: Finite Element Model; Brain; Traumatic Brain Injury; Female Head Model; Dura Mater

Online: 8 March 2024 (10:28:53 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0513.v1

Recent Advancements in Sediment Transport Modelling in Reservoirs

Adewale Ajao

Subject: Engineering, Civil Engineering Keywords: Sediment transport; Modelling; Reservoirs; Dams; Bathymetry

Online: 8 March 2024 (10:07:47 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0472.v1

Systematic Development of application-oriented Operating Strategies at the Example of an Industrial Heating Supply System

Lukas Theisinger, Michael Frank, Matthias Weigold

Subject: Engineering, Control And Systems Engineering Keywords: Approximate MPC; HVAC; Procedure model

Online: 8 March 2024 (09:59:13 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0498.v1

Investigation of Deposition Parameters for Near-Beta Alloy Ti-55511 Fabricated by Directed Energy Deposition

Addison Rayner, Greg Sweet, Owen Craig, Mahdi Habibnejad-Korayem, Paul Bishop

Subject: Engineering, Metallurgy And Metallurgical Engineering Keywords: Directed energy deposition; Near-beta titanium alloys; Ti-55511; Plasma Atomized Powder

Online: 8 March 2024 (09:24:55 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0496.v1

Analysis of Energy Efficiency Opportunities for a Public Transportation Maintenance Facility—A Case Study

Jordan Higgins, Aditya Ramnarayan, Roxana Family, MICHAEL M OHADI

Subject: Engineering, Energy And Fuel Technology Keywords: Energy Audit; Energy Modeling; Energy Efficiency; Transportation Maintenance Facility

Online: 8 March 2024 (09:18:34 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0493.v1

Very Short-Term Prediction of Ship Motion Using Deep Operator Networks

Yong Zhao, Jinxiu Zhao, Sinan Lu

Subject: Engineering, Marine Engineering Keywords: DeepOnet; Very short-term prediction; hyperparameters tuning; functional prediction model; LSTM

Online: 8 March 2024 (05:25:00 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0425.v1

Experimental Study on the Dowel-Bearing Strength of Bambusa Blumeana

Cres Dan Jr. Omictin Bangoy, Jedelle Yu Falcon, Hannah Amyrose Fajardo Lorenzo, Steven Royce Austria Zeng, Lessandro Estelito O Garciano, Carlo Joseph D Cacanando

Subject: Engineering, Civil Engineering Keywords: Bamboo; Dowel-Bearing Strength; Sustainable Construction; Multivariate Regression

Online: 8 March 2024 (04:48:17 CET)

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Preprint REVIEW | doi:10.20944/preprints202403.0466.v1

A Systematic Review on Heat Transfer and Pressure Drop Correlations for Natural Refrigerants

Alberta Carella, Annunziata D’Orazio

Subject: Engineering, Energy And Fuel Technology Keywords: natural refrigerants; two-phase flow; heat transfer; pressure drop; correlations; systematic review

Online: 8 March 2024 (04:03:13 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0462.v1

An Improved Zero-Flowrate Switching Control Method to Reduce Switching Losses in a Hydraulic Actuator

Shuang Peng, Fanglong Yin, Yong Hu

Subject: Engineering, Mechanical Engineering Keywords: hydraulic ; control systems; switching power loss; system efficiency

Online: 8 March 2024 (03:59:38 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0426.v1

Optimization of Erosion Resistant Coating Under High-Speed Flow Conditions in Wellbore to Improve Operational Efficiency

Minsheng Wang, Lingchao Xuan, Lei Wang, Jiangshuai Wang

Subject: Engineering, Energy And Fuel Technology Keywords: Wellbore; High-speed fluid flow; Optimization; Materials; Operational efficiency

Online: 8 March 2024 (03:41:09 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0394.v1

Fuzzy PID Control Design of Mining Electric Locomotive Based on Permanent Magnet Synchronous Motor

Chi Ma, Baosheng Huang, Md Khairul Basher, Md Abdur Rob, Yuqiang Jiang

Subject: Engineering, Control And Systems Engineering Keywords: Fuzzy Proportional-Integral-Derivative (F-PID) controller; Mining electric locomotive; SVPWM; Vector Control; Accurate stopping

Online: 8 March 2024 (01:55:53 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0454.v1

Application of Calcium Carbonate in the Pharmaceutical Removal Process

Izabela Zielińska, Daniel Polak, Aleksandra Jurkiewicz, Julia Osełkowska, Aleksandra Lorek, Michał Stor, Andrzej Krasiński, Paweł Gierycz, Maciej Szwast

Subject: Engineering, Chemical Engineering Keywords: membrane; adsorption; integrated process

Online: 7 March 2024 (13:42:38 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0448.v1

Analysis of the Combined Effect of Major Influencing Parameters for Designing High Performance Single (sBHE) and Double (dBHE) U-Tube Borehole Heat Exchangers

Esa Dube Kerme, Alan S Fung, Wey H Leong

Subject: Engineering, Energy And Fuel Technology Keywords: borehole heat exchanger; heat transfer per unit borehole depth; shank spacing; borehole size; combined impact of parameters; convective heat transfer coefficient

Online: 7 March 2024 (12:52:52 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0442.v1

Enhancing Urban Resilience with Smart Technologies and Predictive Analytics in Setagaya, Tokyo

Yuxin Cong, Shinya Inazumi

Subject: Engineering, Civil Engineering Keywords: ensemble learning; geotechnical information; predictive analytics; smart technologies; urban resilience

Online: 7 March 2024 (12:05:26 CET)

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Preprint REVIEW | doi:10.20944/preprints202401.1982.v2

A Sustainable Environment Requires Sustainable Water – A Review of Some Water Issues to Learn From

Albert Jiang, Edward McBean, Yi Wang

Subject: Engineering, Civil Engineering Keywords: Sustainability; Water Quantity; Water Quality; Climate Change; City subsidence; Groundwater; Population Growth

Online: 7 March 2024 (11:10:49 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0419.v1

Optimizing Tensile Properties and Hardness of Inconel 718 by Cold Rolling

Wakshum Mekonnen Tucho, Anders Thon Sletsjøe, Navid Sayyar, Vidar Hansen

Subject: Engineering, Metallurgy And Metallurgical Engineering Keywords: tensile properties; microstructure; hardness; texture; microscopy; characterization

Online: 7 March 2024 (10:51:31 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0384.v1

Deterministic chaos models-based Gaussian noise generator

Serhii Haliuk, Dmytro Vovchuk, Elisabetta Spinazzola, Jacopo Secco, Vjaceslavs Bobrovs, Fernando Corinto

Subject: Engineering, Electrical And Electronic Engineering Keywords: chaotic models; chaotic circuits; Gaussian noise, Central Limit Theorem

Online: 7 March 2024 (09:38:19 CET)

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The abilities of quantitative description of noise are restricted due to its origin and only the statistical and spectral analysis methods can be applied while an exact time evolution cannot be defined or predicted. It emphasizes the challenges faced in many applications including communication systems where noise can play, on one hand, a vital role impacting signal-to-noise ratio but possessing, on the other hand, unique properties such as infinite entropy (infinite information capacity), exponentially decaying correlation function and so on. Despite the deterministic nature of chaotic systems, the predictability of chaotic signals is limited for a short time window putting them close to random noise. In this article, we propose and experimentally verify an approach to achieve Gaussian-distributed chaotic signals by processing the outputs of chaotic systems. The mathematical criteria, on which the main idea of the study is based on, is the Central Limit Theorem which states that the sum of a large number of independent random variables with similar variances approaches a Gaussian distribution. The study involves more than 40 mostly three-dimensional continuous-time chaotic systems (Chua’s, Lorenz’s, Sprott’s, memristor-based, etc.) whose output signals are analyzed according to criteria that encompass the probability density functions of a chaotic signal itself and its envelope and phase, statistical and entropy-based metrics such as skewness, kurtosis, and entropy power. We found that two chaotic signals of Chua’s and Lorenz’s systems exhibited superior performance across the chosen metrics. Furthermore, our focus extended to determining the minimum number of independent chaotic signals necessary to yield a Gaussian-distributed combined signal. The analytic and experimental results indicate that the sum of at least three non-Gaussian chaotic signals closely approximates Gaussian distribution. It allows generation of reproducible Gaussian-distributed deterministic chaos by modeling simple chaotic systems.

Preprint ARTICLE | doi:10.20944/preprints202403.0387.v1

Study on the mechanical property and design method of frame-unit bamboo culm members based on semi-rigid joints

Guojin Wang, Xin Zhuo, Shenbin Zhang, Jie Wu

Subject: Engineering, Civil Engineering Keywords: frame-unit prefabricated bamboo culm structure; semi-rigid joint; mechanical property; numerical simulation methods; design method.

Online: 7 March 2024 (09:37:20 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0431.v1

Discussion and Demonstration of RF-MEMS Attenuators Design Concepts and Modules for Advanced Beamforming in the Beyond-5G and 6G scenario – Part 1

Girolamo Tagliapietra, Flavio Giacomozzi, Massimiliano Michelini, Romolo Marcelli, Giovanni Maria Sardi, Jacopo Iannacci

Subject: Engineering, Electrical And Electronic Engineering Keywords: RF-MEMS; Attenuators; Low Actuation Voltage; Beamforming; 5G; B5G

Online: 7 March 2024 (09:15:07 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0406.v1

Hexa-Propeller Airship for Environmental Surveillance and Monitoring in Amazon Rainforest

José Raul Azinheira, Reginaldo Hughes Carvalho, Ely Carneiro de Paiva, Rafael de Angelis Cordeiro

Subject: Engineering, Aerospace Engineering Keywords: Airship; Unmanned Aerial Vehicles; Autonomous Control System; Environmental Monitoring; Robotic Vehicles

Online: 7 March 2024 (08:20:19 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0368.v1

Simultaneous Synthesis of Single and Multiple Contaminants Water Networks Using LINGO and Excel Software

Abeer M. Shoaib, Amr A. Atawia, Mohamed H. Hassanean, Abdelrahman G. Gadallah, Ahmed A. Bhran

Subject: Engineering, Chemical Engineering Keywords: Wastewater networks; Multiple contaminants; Mathematical model; Optimization

Online: 7 March 2024 (08:17:53 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0402.v1

Evaluation of SFRP Lugs with SLM Bushing Load Capacity and Dependence of CZM Mode II Model Parameters on Embedded Elements Surface Roughness

Andry Sedelnikov, Evgenii Kurkin, Vitaly Smelov, Vladislava Chertykovtseva, Vyacheslav Alekseev, Andrey V. Gavrilov, Evgenii Kishov, Maksim Zvyagincev, Sergey Chernyakin

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: CZM model; strength; roughness; experiment; adhesion

Online: 7 March 2024 (08:12:49 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0403.v1

Emphasis of Cyclic Loading on the Fracture Mechanism and Residual Fracture Toughness of High-Performance Concrete Considering the Morphological Properties of Aggregate

Gauravdatt Basutkar, Thorsten Leusmann, Dirk Lowke

Subject: Engineering, Civil Engineering Keywords: High performance concrete; Computed tomography; Fracture behaviour; Fatigue; Residual Fracture Toughness

Online: 7 March 2024 (08:10:54 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0416.v1

New Decomposition Models for Hourly Direct Normal Irradiance Estimations for Southern Africa

Francisca Muriel Daniel-Durandt, Arnold Johan Rix

Subject: Engineering, Electrical And Electronic Engineering Keywords: Decomposition Model; Global Horizontal Irradiance; Direct Normal Irradiance; Solar Radiation Model

Online: 7 March 2024 (08:00:59 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0401.v1

Experimental and Analytical Study of Additively Manufactured Ti-TiB Metal Matrix Composite on Directional Isothermal-Fatigue

Thevika Balakumar, Reza A. Riahi, Afsaneh Edrisy

Subject: Engineering, Metallurgy And Metallurgical Engineering Keywords: Additive manufacturing; directional fatigue; isothermal fatigue; Ti– TiB MMC; Paris’ equation; modified Paris’ equation

Online: 7 March 2024 (07:43:05 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.1602.v1

Evaluation of the Mechanical Behavior of Asphaltic Mixtures Utilizing Residue of the Processing of Iron Ore

Antonio Carlos Rodrigues Guimarães, Márcio Leandro Alves de Arêdes, Carmen Dias Castro, Lisley Madeira Coelho

Subject: Engineering, Civil Engineering Keywords: Residues; Marshall dosage; mixtures; pavements

Online: 7 March 2024 (01:41:50 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0373.v1

New Model and Finite Element Analysis of the Anti-extrusion Strength of Backfill Drilling Pipelines

HAO LI, HONGJIANG WANG, CHUNKANG LIU

Subject: Engineering, Mining And Mineral Processing Keywords: backfill filling; pipeline rupture; anti-extrusion strength; finite element analysis ;

Online: 6 March 2024 (14:26:29 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0350.v1

Research on the Calculation Method for the Load Distribution of the Dual-Input Counter-Rotating Transmission System

He Yu, Wankai Shi, Zhenhao Su

Subject: Engineering, Mechanical Engineering Keywords: Jacobian-Torsor; Monte Carlo; local parallel chains; three-dimensional tolerances; equal loading

Online: 6 March 2024 (13:18:19 CET)

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Preprint REVIEW | doi:10.20944/preprints202403.0295.v1

Research, Development and Applications of Subsurface Radars in the USSR and Russia from the 60s to the Present Days

Sergey Ivashov

Subject: Engineering, Civil Engineering Keywords: History of GPR development; Ground-penetrating radar (GPR) and Georadar; Non-destructive testing; Subsurface radar; Surface-penetrating radar

Online: 6 March 2024 (11:41:05 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0355.v1

Effect of Heat Treatment on the Microstructure and Mechanical Properties of Al-7Si-0.7Mg-2.5Fe Processed by Laser Powder Bed Fusion

Leandro Henrique Pereira, Pamela Karina dos Santos Bomfim, Lucas Barcelos Otani, Brenda Juliet Martins Freitas, Walter José Botta, Claudemiro Bolfarini, Claudio S. Kiminami, Piter Gargarella

Subject: Engineering, Metallurgy And Metallurgical Engineering Keywords: Laser Powder Bed Fusion; Al-based alloys; AlFeSi intermetallics; mechanical properties; heat treatment

Online: 6 March 2024 (11:38:35 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0145.v2

Dynamic Event-Triggered Control for Delayed Nonlinear Markov Jump Systems under Randomly Occurring DoS Attack and Packet Loss

Haiyang Zhang, Huizhen Chen, Lianglin Xiong, Yi Zhang

Subject: Engineering, Control And Systems Engineering Keywords: Delayed nonlinear Markov jump systems; attack success rate; Packet loss rate; Dynamic Event-triggered Mechanism; Exponential stability and stabilization

Online: 6 March 2024 (10:57:11 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0314.v1

Collective Creativity and Complexity in Urban Laboratories: El Campo de Cebada

Amanda Martín-Mariscal, Luz Fernández-Valderrama

Subject: Engineering, Architecture, Building And Construction Keywords: collective creativity; ; co-creation; ; complexity; ; social imagination; ; El Campo de Cebada; ; urban laboratories; ; urban design; ; city

Online: 6 March 2024 (10:57:02 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0087.v2

Design and Fabrication of Adaptable Fixture

Xavier Sethu, Michael Thomas Rex

Subject: Engineering, Mechanical Engineering Keywords: fixture; accuracy; clamping; adaptable; workpiece; locating

Online: 6 March 2024 (10:53:04 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0297.v1

A Comprehensive Analysis of Trapezius Muscle EMG Activity in Relation to Stress and Meditation

Mohammad Ahmed, Michael Grillo, Amirtaha Taebi, Mehmet Kaya, Peshala Thibbotuwawa Gamage

Subject: Engineering, Bioengineering Keywords: Stress Monitoring; Meditation; Trapezius Muscle; EMG; Signal Processing; Physiological Sensors

Online: 6 March 2024 (10:47:30 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0310.v1

Evaluation of the Response of Historical Structures Fitted with Seismic-Isolation

Bogdan Felix Apostol, Stefan Florin Balan

Subject: Engineering, Civil Engineering Keywords: historical retrofitted buildings; seismic isolation performance; spectral parameters.

Online: 6 March 2024 (10:08:22 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0290.v1

Influence of Knowledge Uncertainties on the Safety Assessment of Existing Post-tensioned Concrete Bridges

Alberto Poeta, Fabio Micozzi, Laura Gioiella, Andrea Dall'Asta

Subject: Engineering, Civil Engineering Keywords: Existing post tensioned concrete bridges; Safety format; Monte-Carlo simulation; , Knowledge uncertainties; Semi-Probabilistic approach

Online: 6 March 2024 (08:47:14 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0331.v1

Application of Optimal Scheduling for SAR Satellite Constellation: Multi-Imaging Mission in High-Density Regional Area

Kimoon Lee, Dongjin Kim, Daewon Chung, Seonho Lee

Subject: Engineering, Aerospace Engineering Keywords: Optimal scheduling; Synthetic Aperture Radar (SAR); Satellite constellation; Multi-imaging mission; High-density regional area; Modified Dynamic Programming (MDP)

Online: 6 March 2024 (07:13:48 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0271.v1

Machine Learning-Based Human Life Detection behind Walls Exploiting a UWB Radar Sensor

Dimitris Uzunidis, Panagiotis Kasnesis, Charalampos Z. Patrikakis, Stelios A. Mitilineos

Subject: Engineering, Electrical And Electronic Engineering Keywords: human detection; First Responders; Machine Learning; aftermath crisis management; search and rescue; ultra-wideband radar sensors

Online: 6 March 2024 (05:10:57 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0127.v2

Selective Recovery and Recycling of Lithium from Produced Water Bakken Oilfield in North Dakota

Mousa Almousa

Subject: Engineering, Civil Engineering Keywords: Critical metals; Produced water; lithium; Precipitation

Online: 6 March 2024 (04:35:10 CET)

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Preprint REVIEW | doi:10.20944/preprints202403.0161.v1

4IR Applications in the Transport Industry: Systematic Review of the State of the Art with Respect to Data Collection and Processing Mechanisms

O.O. Ajayi, A.M. Kurien, K. Djouani, L. Dieng

Subject: Engineering, Transportation Science And Technology Keywords: transportation systems; systematic review; industrial revolution; data collection; data processing

Online: 6 March 2024 (04:30:45 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0162.v1

Small-Signal Stability of Hybrid Inverters with Grid-Following and Grid-Forming Controls

Xiaotong Ji, Dan Liu, Kezheng Jiang, Zhe Zhang, Yongheng Yang

Subject: Engineering, Electrical And Electronic Engineering Keywords: Paralleled multiple inverters; grid-following; grid-forming; state-space model; small- 17 signal stability; eigenvalues analysis

Online: 6 March 2024 (04:20:08 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0156.v1

The Use of Hydrodynamic Cavitation to Improve the Anaerobic Digestion of Waste from Dairy Cattle Farming – from Laboratory Tests to Large-Scale Agricultural Biogas Plant

Marcin Dębowski, Joanna Kazimierowicz, Anna Nowicka, Magda Dudek, Marcin Zieliński

Subject: Engineering, Energy And Fuel Technology Keywords: cattle manure; milking station; anaerobic digestion; pretreatment; hydrodynamic cavitation; biogas; methane; energy efficiency

Online: 6 March 2024 (04:05:53 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0284.v1

Pavement Crack Detection of UAV Autonomous Inspection System for Mountainous Roads

Chen Xinbao, Wang Chenxi, Liu Chang, Xiaodong Zhu, Zhang Yaohui, Luo Tianxiang, Zhang Junhao

Subject: Engineering, Transportation Science And Technology Keywords: Concrete crack detection; UAV inspection system; YOLOv8; mountainous road

Online: 5 March 2024 (16:07:06 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0252.v1

Analysis of Kinematics and Dynamics Performance of a New Type of Three-Pronged Sliding Universal Coupling

Xia Xiu, Degong Chang, Yunpeng Ju, Liang Zheng

Subject: Engineering, Mechanical Engineering Keywords: Three fork type universal coupling; Kinematics; Dynamic performance; The optimal operating angle range

Online: 5 March 2024 (13:56:00 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0221.v1

Developing a YOLOv3-Based Neural Network to Enable Digital Cameras to Detect Features on the Reflective Surface of Objects in Robotic Applications: A Low-Computational Approach with a New Public Dataset

Albin Bajrami, Matteo Claudio Palpaceli

Subject: Engineering, Mechanical Engineering Keywords: Feature Detection; Object Reflective Surfaces; YOLOv3 Neural Network; Transfer Learning; Digital Cameras; Collaborative Robots; Machine Learning in Manufacturing; Automation in Polishing; Industrial AI Applications; GPU; CUDA and cuDNN

Online: 5 March 2024 (13:21:58 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0209.v1

Estimating the influencing factors of Gas-Water Relative Permeability in Condensate Gas Reservoirs under High-Temperature and High-Pressure Conditions

Shuheng Cui, QiLin Wu, Zixuan Wang

Subject: Engineering, Energy And Fuel Technology Keywords: gas-water relative permeability; high temperature; high pressure; condensate gas reservoir; influencing factors

Online: 5 March 2024 (10:57:23 CET)

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Preprint REVIEW | doi:10.20944/preprints202403.0167.v1

Review of Accurate Detection of Human Skin Tissue Temperature Based on Microwave Radiation Method

Jingtao Wu, Jie Liu

Subject: Engineering, Bioengineering Keywords: microwave radiation diagnosis; accurate temperature measurement; pencil beam; correlated radiometer architecture; combining forward and inversion

Online: 5 March 2024 (10:22:56 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0196.v1

System Identification and Dynamic Analysis of the Propulsion Shaft Systems Using Response Surface Optimization Technique

Aavash Chandra Paudel, Sushil Doranga, Yueqing Li, Mukunda Khanal

Subject: Engineering, Mechanical Engineering Keywords: Propeller Shaft, Vibrations, Optimization, Response Surface

Online: 5 March 2024 (09:18:00 CET)

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For marine vessels, a propeller shaft system, also known as a propulsion shaft system, is an essential changer in engine torque and propeller thrust. The propeller shaft system is subjected to transverse, longitudinal, and torsional excitations during operation. These sources of excitations originate from alternating thrust generated by the propeller, operation of a propeller in a stern flow field which is non-uniform in time and space, misalignment of components such as shafts, bearings, and keyholes in the assembly, excitations in the form of rotational motion, and the whirling motion of the shafts. These dynamic excitations posed a challenging issue for the integrity and reliability of a marine vehicle. Thus, it is crucial to analyze the dynamic response of the propulsion shaft system. The dynamic analysis of the propulsion shaft system is typically conducted using numerical /analytical models. At present, Finite Element Model (FEM) as a numerical model plays a vital role in analyzing the dynamic response of the structure. The computed response and the modal parameters from the FE model are reliable only if accurate boundary conditions, such as stiffness, can be imposed on the model. However, the numerical FE model deviates from the experimental results because of uncertainties in the stiffness values of the bearings and other connectors. This paper uses the Response Surface Optimization (RSO) technique to estimate the unknown stiffness of the bearings used in the propulsion shaft system. The experimental model of the propeller shaft system is constructed from the steady-state response of the system using the step sine excitation. The natural frequencies and the amplitude of vibrations in the FE model are updated using the parametric RSO technique. The updated model shows that the difference in natural frequencies and vibration amplitude is less than 10% between the optimized and experimental models. Propeller Shaft, Vibrations, Optimization, Response Surface

Preprint ARTICLE | doi:10.20944/preprints202403.0226.v1

The Synergy Between Methanol M100 and Plasma Assisted Ignition System PAI to Achieve Increasingly Leaner Mixtures in a Single-Cylinder Engine.

Federico Ricci, Francesco Mariani, Stefano Papi, Jacopo Zembi, Michele Battistoni, Carlo Nazareno Grimaldi

Subject: Engineering, Automotive Engineering Keywords: lean combustion; kinetic; methanol fuel; Plasma Assisted Ignition; SI engine

Online: 5 March 2024 (06:42:22 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0224.v1

An Investigation into the Distribution of Fluctuating Wind Pressure and Associated Probabilistic Characteristics of Low-Rise Buildings Impacted by the Gap between the Hillside and the Building

Min Zhong, Chao Wang, Minghui Lin, Junyu Lu, Xiangjun Wang

Subject: Engineering, Civil Engineering Keywords: Fluctuating wind pressure distribution; Probabilistic properties; Low-rise buildings; Mountain form; The gap between the hillside and the building

Online: 5 March 2024 (06:39:04 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0229.v1

A Novel Hybrid Approach to the Diagnosis of Simultaneous Imbalance and Shaft-Bow in a Jeffcott Rotor-Bearing System.

Shyh-Chin Huang, Sherina Octaviani, Mohammad Najibullah

Subject: Engineering, Mechanical Engineering Keywords: hybrid approach; multi-fault diagnosis; machine learning; feed-forward neural network

Online: 5 March 2024 (06:36:41 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0228.v1

Droplet Formation and Energy Input during Induction Wire Melting with Pulsed and Constant Generator Power

Jonas Kimme, Jonas Gruner, André Hälsig, Jonas Hensel

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: additive manufacturing; directed energy deposition; 3D printing; induction heating; calorimetry; mild steel; wire feedstock; pulsed power; process monitoring

Online: 5 March 2024 (06:33:04 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0169.v1

Flexible Regulation and Synergy Analysis for Multiple Loads of Buildings in a Hybrid Renewable Integrated Energy System

Mou Wu, Fan Junqiu, Rujing Yan, Xiangxie Hu, Jing Zhang, Yu He, Guoqiang Cao, Weixing Zhao, Da Song

Subject: Engineering, Energy And Fuel Technology Keywords: hybrid renewable integrated energy system; flexible buildings; renewable energy consumption; regulation and synergy mechanism; operation optimization

Online: 5 March 2024 (05:59:37 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0145.v1

Dynamic Event-triggered Control for Delayed Nonlinear Markov Jump Systems under Randomly Occurring DoS attack and Packet Loss

Haiyang Zhang, Huizhen Chen, Lianglin Xiong, Yi Zhang

Subject: Engineering, Control And Systems Engineering Keywords: Delayed nonlinear Markov jump systems; attack success rate; Packet loss rate; Dynamic Event-triggered Mechanism; Exponential stability and stabilization

Online: 5 March 2024 (05:03:58 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0171.v1

Piezoresistive Porous Composites with Triply Periodic Minimal Surface Structures Prepared by Self-Resistance Electric Heating and 3D printing

Ke Peng, Tianyu Yu, Pan Wu, Mingjun Chen

Subject: Engineering, Mechanical Engineering Keywords: 3D printing; triply periodic minimal surface; composites; sensors

Online: 4 March 2024 (19:03:03 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0185.v1

The Expected Dynamics for the Extreme Wind and Wave Conditions at the Mouths of the Danube River in Connection with the Navigation Hazards

Alina Beatrice Răileanu, Liliana Rusu, Andra Luciana Marcu, Eugen Rusu

Subject: Engineering, Marine Engineering Keywords: Sulina channel; Danube mouths; Black Sea; navigation hazards; historical data; climate scenarios; atmospheric models; wave model simulations

Online: 4 March 2024 (15:53:26 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0132.v1

A Chip-Level Testing Platform of Unmanned Vehicle Autopilot Systems with FPGA-Based Hardware-in-the-Loop Simulation

Xunhua Dai, Ruyi Fang

Subject: Engineering, Control And Systems Engineering Keywords: unmanned vehicles; autopilot systems; chip-level faults; hardware-in-the-loop (HIL) simulation; Field Programmable Gate Array (FPGA)

Online: 4 March 2024 (13:57:38 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0168.v1

Impact of Reducing Statistically Small Population Sampling on 2 Threshold Detection in FBG Optical Sensing

Gabriel Cibira, Ivan Glesk, Jozef Dubovan, Daniel Benedikovič

Subject: Engineering, Telecommunications Keywords: statistically small population sampling; two-sided sampling; one-sided sampling; 29 threshold detection; fiber Bragg gratings; FBG sensing; optical spectrum analysis;

Online: 4 March 2024 (13:37:33 CET)

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Statistical denoising techniques have been well studied, however many challenges still remain. This 9 article focuses on determining the least necessary number of significant samples in a statistical pop-10 ulation sampling, while minimizing the impact on the statistical detection of the fiber Bragg grating 11 (FBG) power spectra. This is achieved by using Bayesian decision making, small population statis-12 tics while excluding false detection. First, we investigate the impact of two-sided sliding window 13 technique applied near the cell under the test. The window size varies from 8 to 60 samples. The 14 considered maximum size of population sampling is connected with the number of wavelength 15 samples within the bandwidth of the symmetrical FBG power spectra peaks. Regarding the sym-16 metry of FBG power spectra peaks and the possible reduction of computational demands, we inves-17 tigate the impact of a one-sided sliding window. This enables to achieve less processing latency for 18 real time applications thus brings benefits to FBG-based fiber optical sensing. Both, two- and one-19 sided small population sampling techniques are then experimentally verified. Detection results are 20 analyzed in depth via calculating detection thresholds by using the small size window sliding along-21 side the waveband. From results achieved, it was found that the normality three-sigma rule does 22 not need to be followed while using the small population sampling. Experimental demonstrations 23 and analyses showed that the proposed concept of denoising and statistical threshold detection 24 based on the sliding window does not depend on the prior knowledge of probability distribution 25 functions of the FBG power spectra peaks level and background noise. We have also found that the 26 thresholds’ adaptability mainly depends on the statistical numerical characteristics of the above ad-27 ditive mixture of the FBG power spectra peaks signals and background noise.

Preprint ARTICLE | doi:10.20944/preprints202403.0163.v1

Optimizing Lane Departure Warning System Towards AI-Centered Autonomous Vehicles

Siwoo Jeong, Jonghyeon Ko, Sukki Lee, Jihoon Kang, Yeni Kim, Soon-Yong Park, Sungchul Mun

Subject: Engineering, Other Keywords: LDWS; autonomous vehicle; road markings; retro-reflectivity; environmental conditions; simulation framework

Online: 4 March 2024 (13:35:42 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0141.v1

Evaluating Distraction Safety Performance Indicators in an Urban Area of a LMIC: A Case Study of Yaoundé, Cameroon

Steffel Ludivin Feudjio Tezong, Boris Feudjio Tchinda, Stephen Kome Fondzenyuy, Davide Shingo Usami, Luca Persia

Subject: Engineering, Transportation Science And Technology Keywords: distracted driving; distraction; handheld mobile device; road safety; safety performance indicator; prevalence; LMIC; roadside observation; urban area.

Online: 4 March 2024 (11:24:16 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0128.v1

Mechanical Model and Finite Element Analysis of Concrete False Roof in Downward Approach Type Infill Quarry

HAO LI, HONGJIANG WANG, CHUNKANG LIU

Subject: Engineering, Mining And Mineral Processing Keywords: concrete false roof; thin slab theory; ultimate strength; thickness; downward approach infill mining method

Online: 4 March 2024 (10:58:01 CET)

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Concrete is more stable than filler as a false roof in a downward approach type infill quarry, but the mechanical model of a concrete false roof is not clear. As a result, there has been limited application. Therefore, it is necessary to establish the mechanical model of a concrete artificial false roof to enhance the stability of the downward approach infill quarry. This paper combines theoretical analysis, model derivation, finite element analysis and field application methods. Firstly, the basic assumptions of thin plate theory and elasticity mechanics are used as the premise to establish the differential equations of the deflection curve of the concrete thin plate false roof. Then, the three types of bending moment generation of the concrete thin plate false roof are explored. Secondly, the relationship between the location of dangerous surface and dangerous point in hard-supported weak-slab structure and soft-supported weak-slab structure is analyzed, and the type of uniform load and calculation model of concrete thin-slab false roof are improved. Finally, according to the established mechanical model of thin slab false roof, finite element analysis and field application were carried out. The results show that there are three types of deflection curve differential equations in the concrete thin slab false roof perpendicular to the strike, and three extreme points exist in the middle section of the thin slab and on both sides of the surrounding rock. The hazardous surface of the hard-supported weak-slab structure is present at the intersection of the encircling rock and the thin-slab fake ceiling, with the perilous point situated on the top of this surface. The hazardous surface of the soft-supported weak-slab structure can be found in the centre section of the thin-slab fake ceiling, with the perilous point being located at the bottom of this surface. Moreover, the damage mode for both structures is that of maximum tensile stress damage. Upon conducting a finite element analysis, the results indicate that the concrete's maximum tensile stress is significantly high.

Preprint ARTICLE | doi:10.20944/preprints202403.0144.v1

Analysis of Hydrogen Combustion in a Spark Ignition Research Engine with a Barrier Discharge Igniter

Federico Ricci, Massimiliano Avana, Jacopo Zembi, Carlo Nazareno Grimaldi, Michele Battistoni, Stefano Papi

Subject: Engineering, Automotive Engineering Keywords: Hydrogen fuel; SI engine; Barrier Discharge Igniter; ultra-lean combustion

Online: 4 March 2024 (10:57:16 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0127.v1

Selective Recovery and Recycling of Lithium from Produced Water Bakken Oilfield in North Dakota

Mousa Almousa

Subject: Engineering, Civil Engineering Keywords: Critical metals; Produced water; lithium; Precipitation

Online: 4 March 2024 (10:55:42 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0076.v1

An Autonomous Tow Truck Algorithm for Engineless Aircraft Taxiing

Stefano Zaninotto, Jason Gauci, Brian Zammit

Subject: Engineering, Aerospace Engineering Keywords: engineless taxiing; tow trucks; shortest path algorithm; Dijkstra

Online: 4 March 2024 (10:42:05 CET)

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Preprint REVIEW | doi:10.20944/preprints202403.0079.v1

A Review of Orebody Knowledge Enhancement using Machine Learning on Open Pit Mine Measure-While-Drilling Data

Daniel Goldstein, Chris Aldrich, Louisa O'Connor

Subject: Engineering, Mining And Mineral Processing Keywords: Measure While Drilling (MWD); Open-pit mining; Subsurface characterization; Machine Learning (ML); Data acquisition; Rock properties; Geochemical analysis; Artificial Intelligence (AI); Predictive modeling; Feature Importance

Online: 4 March 2024 (09:29:05 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0124.v1

Physical Modeling of a Water Hydraulic Proportional Cartridge Valve for a Digital Twin in a Hydraulic Press Machine

Oscar Bautista Gonzalez, Daniel Rönnow

Subject: Engineering, Control And Systems Engineering Keywords: Proportional cartridge valve; water hydraulics; white-box modeling; system identification; hydraulic press; steel industry

Online: 4 March 2024 (09:02:59 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0067.v1

Structural Behaviour and Strength Evaluation of a Venetian Church through Finite Element Analysis

Maria E. Stavroulaki, Ioannis (Yannos) Liofagos, Panagiotis Darmarakis

Subject: Engineering, Civil Engineering Keywords: Finite Element Analysis; Dynamic Analysis; Earthquake Analysis; Unreinforced Masonry; Architectural survey, Masonry Vaults, Venetian church

Online: 4 March 2024 (08:57:11 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0029.v1

Improvement of Phased Antenna Array Applied in Focused Microwave Breast Hyperthermia

Xuanyu Wang, Zijun Xi, Ke Ye, Zheng Gong, Yifan Chen, Xiong Wang

Subject: Engineering, Bioengineering Keywords: Antenna array; biomedical antennas; breast cancer; focused microwave breast hyperthermia (FMBH); hyperthermia

Online: 4 March 2024 (06:16:51 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0033.v1

Community Battery for Collective-Self-Consumption and Energy Arbitrage: Techno-Economic Simulations Assessing Energy Balances, Battery Ageing and Different Market Scenarios

Mattia Pasqui, Lorenzo Becchi, Marco Bindi, Matteo Intravaia, Francesco Grasso, Gianluigi Fioriti, Carlo Carcasci

Subject: Engineering, Energy And Fuel Technology Keywords: renewable energy community; battery energy storage system; scheduling; ageing; collective-self-consumption; energy arbitrage

Online: 4 March 2024 (06:12:07 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0087.v1

Design and Fabrication of Adaptable Fixture

Xavier Sethu

Subject: Engineering, Mechanical Engineering Keywords: fixture; accuracy; clamping; adaptable

Online: 4 March 2024 (05:52:45 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0078.v1

Operational Analysis of an Axial and Solid Double-Pole-Tweeted-Rotor Configuration in a PM Flux Switching Generators

Manuel Pedro Garcia Neto, Francisco Ferreira Silva, P. J. da Costa Branco

Subject: Engineering, Electrical And Electronic Engineering Keywords: Switched Flux Generator; Oscillatory Torque; Linked Flux; Torque Density

Online: 3 March 2024 (18:20:22 CET)

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Preprint ARTICLE | doi:10.20944/preprints202402.1090.v2

Mangroves as Coastal Protection for Restoring Low-Energy Waterfront Property

Robert J. Weaver, Abigail L. Stehno

Subject: Engineering, Other Keywords: mangrove; wave attenuation; restoration; physical model; laboratory experiment; tree parameterization sediment stabilization

Online: 1 March 2024 (18:31:16 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0069.v1

An Attitude Adaptive Integral Sliding Mode Control Algorithm with Feedforward Compensation Disturbance Observer for Microsatellites to Track High-Speed Moving Targets

Xinyan Yang, Lei Li, Yurong Liao, Zhaoming Li

Subject: Engineering, Aerospace Engineering Keywords: Microsatellite; Attitude Control; Moving Target Tracking; Disturbance Observer; Sliding Mode Control

Online: 1 March 2024 (18:25:20 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0066.v1

Assessment of Health Problems and Hazards Prevalent among Garment Workers in a Developing Country: An Approach using Risk Priority Number and Best-Worst Method

Farzana Islam

Subject: Engineering, Safety, Risk, Reliability And Quality Keywords: Risk assessment, Garment industry, RMG, Health risks, Best-worst method, MCDM

Online: 1 March 2024 (16:53:25 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0051.v1

Synergizing Transfer Learning and Multi-Agent Systems for Thermal Parametrization in Induction Traction Motors

Fozia Mehboob, Anas Fattouh, Smruti Sahoo

Subject: Engineering, Control And Systems Engineering Keywords: Reinforcement learning; Transfer Learning; Railway Propulsion system; Induction motor; Thermal model; Optimization

Online: 1 March 2024 (14:17:12 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0054.v1

Research on Fault Detection by Flow Sequence Algorithm with Deep Learning Model for Industrial Internet of Things

Dongfeng Lei, Liang Zhao, Dengfeng Chen

Subject: Engineering, Control And Systems Engineering Keywords: Industrial Internet of Things; Deep learning; Subsequence classification; Fault diagnosis

Online: 1 March 2024 (14:05:52 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0049.v1

The Impact of the Water Tariff on the Economic Feasibility of Rainwater Harvesting for Use in Buildings

Aline Eloize Borgert, Enedir Ghisi

Subject: Engineering, Civil Engineering Keywords: potable water savings; technical viability; economic feasibility; computer simulation; residential buildings.

Online: 1 March 2024 (12:49:22 CET)

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