力学技术讲堂第25期 讲座预告

报告人：   成利 教授 （香港理工大学）

报告题目：Acoustic Black Holes for vibration and noise control applications

报告时间：2021年3月13日（周六）19:30

腾讯会议：ID(796267403)

邀 请 人： 孙博华教授 南非科学院院士、力学技术研究院院长和首席科学家

报告人简介：

Dr. Li Cheng is a Chair Professor and former Head of the department of Mechanical Engineering of the Hong Kong Polytechnic University. He was also the former President of the Hong Kong Society of Theoretical and Applied Mechanics. He started his academic career at Laval University, Canada in 1992, rising up to the rank of Full Professor before joining Hong Kong PolyU in 2000. Dr. Cheng serves as Deputy Editor-in-Chief of Journal of Sound and Vibration, Associate Editor of the Journal of the Acoustical Society of America, Associate Editor of Structural Health Monitoring: An International Journal. He is elected Distinguished Fellow of the International Institute of Acoustics and Vibration (IIAV), Fellow of the Acoustical Society of America, Acoustical Society of China, IMechE, Hong Kong Institution of Engineers and Hong Kong Institute of Acoustics. He is now a Board Director of IIAV and the Vice-president Asia Pacific of I-INCE (International Institutes of Noise Control Engineering).

报告摘要：

Propagation of acoustic waves (sonic or vibrational) can be manipulated through proper tuning of either material or geometrical parameters. As an example, acoustic-relevant flexural waves propagating inside a vibrating structure can be manipulated through the so-called Acoustics Black Holes (ABH) effects. Through a proper tailoring of the structural thickness, the phase velocity of the bending wave gradually reduces alongside thickness thinning, thus entailing high energy concentration and effective energy dissipation using a small amount of damping materials. The phenomenon arouses increasing interests from the scientific community and inspires innovative design solutions for light-weight, highly damped and sound-proof structures. In this talk, some of the recent progress on ABH research made by the team led by the speaker and his close collaborators will be highlighted. In particular, issues like structural modelling, ABH-specific phenomena alongside the underlining vibroacoustic principles, ABH structural design and potential industrial applications will be addressed.

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