Seminar - Base Isolation using nonlinear mode localization and modal LQG control by Dr. Yumei Wang
Date: 12 May 2014 (Monday)
Time: 11:00 am – 12:00 pm
Venue:EF305, The Hong Kong Polytechnic University
This lecture focuses on using inter-discipline concepts to get insight into and improve the earthquake performance of traditional civil engineering structures. Two types of novel base isolation systems different from common base isolation systems are to be introduced. The first one is designed based on the concept of Nonlinear Normal Modes (NNMs) in nonlinear dynamics theory to achieve more effective vibration isolation, because NNMs often lead to mode localization effects with proper design of nonlinearity. The second borrowed the concepts of Controllability and Observability and Modal Transformation methodology in control theory to improve the traditional nodal-based LQG control method, so that a smart base isolation system could be designed with more simplified procedures in light of explicit physical interpretation and analytical equations. The efficacy of both systems is validated by numerical analyses using Matlab-based models with earthquake excitations.
Dr. Wang received his B.Eng in Civil Engineering from the Tongji University in Shanghai, China, M.sc from University of Illinois at Urbana-Champaign, USA, and D.sc in Civil/structural Engineering from Washington University in St. Louis, USA. After working in a consulting firm in Los Angeles for four years, he joined in the Institute of Engineering Mechanics, China Earthquake Administration (IEM/CEA) in Harbin as a faculty member. During the study in the USA, his research focused on nonlinear dynamics, vibration mitigation and structural control. While working in the consulting firm, he concentrated more on the performance-based design and retrofitting of public buildings such as schools and hospitals. In IEM, he mainly works on building seismic risk analysis and performance upgrading. He has been working in the area of disaster prevention and earthquake protection of building structures for many years.