Thesis topic of HAN Yunhyeok and theses.fr

Abstract :

This thesis proposal is part of WP1 of the ANR AAPG 2021 project ’Optical identification and modeling of the nonlinear dynamics of high-rise timber buildings’ (DYNATIMBEREYES), whose objective is to develop a camera-based measurement protocol to measure the vibrations of timber buildings and large structures in general. The video analysis aims at identifying the non-linear properties of the assemblies (WP2) and at feeding a digital twin of the structure (WP3).
The scientific challenge of the thesis is related to the difficulty of performing such camera-based measurements on large civil engineering structures : optimal and robust camera placement, operational conditions, accuracy, computational cost, noise and spatial resolution. In particular, the selection of a few high resolution cameras and/or a network of medium resolution cameras will meet specific requirements such as synchronization capacity, compatibility of the acquisition frequency with the building dynamics, transportability and ease of installation. Then, specific analyses will be carried out to predict and quantify the errors related to the acquisition conditions during the in-situ campaign : weather, non-optimal lighting and camera positioning, uncontrolled excitation (wind), etc. For the image post-processing stage, particular attention will be paid to the best methods to use (edge, angle, test pattern, texture detection ...) and tracking techniques (optical flow, DIC, MSER, motion magnification ...) [1, 2, 3]. The camera-based field analysis will focus on the dynamics of wooden structures at different scales, in the laboratory under controlled excitation and in-situ in the case of operational modal analysis (OMA).

Supervison : 

Under supervison of Associate Professor Franck RENAUD (ISAE-Supméca) and MCF Stefania LO FEUDO (ISAE-Supméca)