Online system identification of structures using time-domain approaches
Speaker: Hongwei Huang, Tongji University, Shanghai, China
Series: CEE Departmental Seminars
Location: Bowen Hall Auditorium
Date/Time: Friday, June 14, 2013, 10:30 a.m. - 12:00 p.m.
An important goal of any structural health monitoring system is to detect structural damages in order to ensure the reliability and safety of structures in addition to the minimization of life-cycle cost. An early detection of structural damages is critical for the decision making of repair and replacement maintenance in order to guarantee a specified structural reliability. Analysis methodologies based on vibration data measured from sensors has received increasing attention recently for damage identification of structures. Most of the methodologies available in the literature are capable of identifying constant system parameters, and the damage is obtained by a comparison of the constant structural parameters prior to and after damages. In practice, however, the referenced data may not be available or difficult to obtain, especially after a severe event, such as a strong earthquake. Hence, it is desirable for an analysis method to be capable of detecting the structural damage based solely on the vibration data measured during a severe event without a prior knowledge of the undamaged structure. In this presentation, several on-line damage identification methodologies developed recently, including the least square estimation (LSE), the extended Kalman filter (EKF), the sequential nonlinear least square estimation (SNLSE), and the quadratic sum-squares error (QSSE), will be introduced and compared for their abilities of identifying structural parameters as well as tracking structural damages.
Hongwei Huang is currently an Associate Professor in the Department of Bridge Engineering, Tongji University, Shanghai, China. She is also a member of the State Key Laboratory for Disaster Reduction of China. She received her Ph.D in Civil Engineering from University of California, Irvine (UCI) in 2006, and obtained both M.Eng of Civil Engineering and Graduate Diploma in Mathematics from National University of Singapore (NUS) and got her Bachelor in Civil Engineering from Nanyang Technological University of Singapore (NTU). Her research interests includes smart structure and materials, structural control and health monitoring, system identification and damage detection of structures, structural reliability and sustainability, structural risk assessment, and etc.