Preprint Article Version 1 This version is not peer-reviewed

Life Cycle Modeling of Structural Defects via Computational Geometry and Time Series Forecasting

Version 1 : Received: 27 June 2019 / Approved: 1 July 2019 / Online: 1 July 2019 (12:23:16 CEST)

How to cite: Mohamadi, S.; Lattanzi, D. Life Cycle Modeling of Structural Defects via Computational Geometry and Time Series Forecasting. Preprints 2019, 2019070016 (doi: 10.20944/preprints201907.0016.v1). Mohamadi, S.; Lattanzi, D. Life Cycle Modeling of Structural Defects via Computational Geometry and Time Series Forecasting. Preprints 2019, 2019070016 (doi: 10.20944/preprints201907.0016.v1).

Abstract

The evaluation of geometric defects is necessary in order to maintain the integrity of structures over time. These assessments are designed to detect damages of structures and ideally help inspectors to estimate the remaining life of structures. Current methodologies for monitoring structural systems, while providing useful information about the current state of a structure, are limited in the monitoring of defects over time and in linking them to predictive simulation. This paper presents a new approach to the predictive modeling of geometric defects. A combination of segmented from point clouds are parametrized using the convex hull algorithm to extract features from detected defects, and a stochastic dynamic model is then adapted to these features to model the evolution of the hull over time. Describing a defect in terms of its parameterized hull enables consistent temporal tracking for predictive purposes, while implicitly reducing data dimensionality and complexity as well. In this study, 2D point clouds analogous to information derived from point clouds were first generated over simulated life-cycles. The evolutions of point cloud hull parameterizations were modeled as stochastic dynamical processes via autoregressive integrated moving average (ARIMA) and vectorized autoregression (VAR) and compared against ground truth. The results indicate that this convex hull approach provides consistent and accurate representations of defect evolution across a range of defect topologies and is reasonably robust to noisy measurements, however assumptions regarding the underlying dynamical process play a significant the role in predictive accuracy. The results were then validated on experimental data from fatigue testing with high accuracy. Longer term, the results of this work will support finite element model updating for predictive analysis of structural capacity.

Subject Areas

Remote sensing; Photogrammetry; Life cycle modeling; Time series forecasting; Structural damage; Stochastic modeling; Convex Hull; ARIMA; VAR; Fatigue crack prediction

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