Design optimization of dynamic vibration absorbers

日時:
2011年2月2日 15:00 - 16:30

場所:
京都大学吉田キャンパス　工学部2号館335号室

講師:
Wong Wai On氏

講師所属:
The Hong Kong Polytechnic University

講師略歴:
Wai On Wong is an associate professor of the Hong Kong Polytechnic University. He was awarded a BEng (Hons) degree in mechanical engineering by the Hong Kong Polytechnic in 1987 and worked as a mechanical engineer in the local industry from 1987-1990. He joined then the Hong Kong Polytechnic (now upgraded as The Hong Kong Polytechnic University) in 1990 and has since worked as a lecturer with the Mechanical Engineering Department. Through part-time studies, he obtained a MSc degree in Precision Engineering in 1992 and a PhD in 1997. He was promoted to assistant professor in 1999 and associate professor in 2010. His research areas are vibration analysis and optical metrology with digital holographic interferometry. Recent research areas of WO Wong are design optimizations of dynamic vibration absorbers and power flow analysis. He has published 32 journal papers and 22 conference proceedings.


講演概要:
This talk is about the design optimization of dynamic vibration absorbers applied for suppressing structural vibrations. The idea of mounting a lightweight mass damper to reduce oscillating motions of structures like ships or buildings has been thoroughly investigated in the last few decades. Dynamic vibration absorber (DVA) or tuned-mass-damper has successfully been used to suppress excessive vibrations in many modern civil structures such as Taipei 101 skyscraper and the London Millennium Footbridge. These absorbers are big structures and tuned to absorb only one vibration mode of the whole civil structure.

The major limitation of the absorber designs found in literature are that they are designed for suppressing narrowband or broadband vibration of a structure at one point only and other parts of the controlled structure may still vibrate severely at the resonant frequencies. In this talk, I'll discuss new methods to improve the traditional design of DVA for vibration isolation and vibration suppression of the whole flexible structure being controlled. New designs of DVA will be introduced and these new DVAs can provide better vibration suppression performance than the traditional design if their designs are optimized.