A comparative study of frequency-domain finite element updating approaches using different optimization procedures
Abstract »In order to achieve a more accurate finite element (FE) model for an as-built structure, experimental data collected from the actual structure can be used to update selected parameters of the FE model. The process is known as FE model updating. This research compares the performance of two frequency-domain model updating approaches. The first approach minimizes the difference between experimental and simulated modal properties, such as natural frequencies and mode shapes. The second approach minimizes modal dynamic residuals from the generalized eigenvalue equation involving stiffness and mass matrices. Both model updating approaches are formulated as an optimization problem with selected updating parameters as optimization variables. This research also compares the performance of different optimization procedures, including a nonlinear least-square, an interior-point and an iterative linearization procedure. The comparison is conducted using a numerical example of a space frame structure. The modal dynamic residual approach shows better performance than the modal property difference approach in updating model parameters of the space frame structure.
Affiliation: Georgia Institute of Technology Atlanta USAWang, Yang*Wang, Yang* firstname.lastname@example.org (404)894-1851
Biography: Dr. Yang Wang is an Associate Professor in the School of Civil and Environmental Engineering at the Georgia Institute of Technology. After completing a B.S. and an M.S. degree in Civil Engineering at Tsinghua University in Beijing, China, he received a Ph.D. degree in Civil Engineering at Stanford University in 2007, as well as an M.S. degree in Electrical Engineering. Dr. Wang’s research interests include structural health monitoring and damage detection, decentralized structural control, wireless and mobile sensors, and structural dynamics. He received an NSF Early Faculty Career Development (CAREER) Award in 2012 and a Young Investigator Award from the Air Force Office of Scientific Research (AFOSR) in 2013. Since 2011, he has served as an Associate Editor for the ASCE (American Society of Civil Engineers) Journal of Bridge Engineering. http://wang.ce.gatech.edu http://wang.ce.gatech.edu
Affiliation: Georgia Institute of Technology School of Civil and Environmental Engineering 30097 Atlanta USA (404)894-1851 wang.ce.gatech.edu*Contact