Ⅱ
NOISE AND VIBRATION CONTROL背侧丘脑
安徽地方志
特邀专题报告Ⅱ
克里奥尔语在振动噪声控制中的应用
成利
(香港理工大学机械工程系)
Structural Wave Manipulation through Acoustic Black Hole Effect for
Vibration and Noise Control反修正主义
CHENG Li
噪声与振动控制(Department of Mechanical Engineering,The Hong Kong Polytechnic University,
Hong Hom,Kowloon,Hong Kong,China)
Abstract:Acoustics Black Holes(ABH)effects can be achieved through manipulations of bending wave propagation inside a thin-walled structure with its thickness tailored according to a power-law variation.In doing so,the phase velocity of the bending wave gradually reduces alongside thickness thinning,eventually to zero in the ideal scenario at the wedge tip/indentation center,resulting in zero wave reflection and high energy concentration within a small localized area.The phenomenon attracts increasing attentions as a promising passive vibration control method because vibration energy can be channeled and only a very small amount of damping material is required within the energy focalization region to achieve efficient damping to flexural waves.In addition,the wave slowing phenomenon allows the creation of a subsonic region inside a supersonic structure,thus reducing the its overall sound radiation efficiency.These unique features point at a great potential of the ABH technology for various applications such as vibration control,sound radiation reductions and energy harvesting.This talk summarizes some of the recent progress made in the study of the ABH.Topics cover the semi-analytical modelling of the ABH structures;design and analysis of a double-layer compound ABH beam for improved static and dynamic properties;combination of locally resonant an
d Bragg scattering for broadband stopband creation as well as some examples of ABH for vibration and sound noise control applications.
Bio-sketch:Dr.Li Cheng is currently a Chair Professor of Mechanical Engineering and the Director of Consortium for Sound and Vibration Research(CSVR)at the Hong Kong Polytechnic University.He started his academic career at Laval University,Canada in1992,rising from an assistant professor to Associate/Full Professor, before coming to Hong Kong in2000,where he was promoted to Chair Professor in2005and was the Head of Department from2011to2014.Dr.Cheng published extensively with more than200journal papers and250 conference papers in the field of sound and vibration,structural health monitoring,smart structure and fluid-structure interaction.He also edited a few books and held6patents.He is an elected fellow of the Acoustical Society of America,Acoustical Society of China,IMechE,Hong Kong Institution of Engineers and Hong Kong Institute of Acoustics.He currently serves as Deputy Editor-in-Chief and Receiving Editor of Journal of Sound and Vibration,Associate Editor for the Journal of Acoustical Society of America,Associate Editor of Structural Health Monitoring:an International Journal and editorial board member of another6journals.Dr.Cheng also been a Plenary/Keynote Speaker at conferences in USA,UK,France,Japan,Greece,India,South Korea,Poland, Bangladesh as well as China,including so
me of the most prestigious conferences in his field such as47th Inter-noise,23rd ICSV,13th RASD,15th APVC and12th ICOVP.He also served as the general Chair of the46th International Congress on Noise Control Engineering(Inter-noise)and the Chair of14th and17th Asia Pacific Vibration Conference(APVC).Dr.Cheng is currently the President of the Hong Kong Society of Theoretical and Applied Mechanics.He is also a board director of both IIA V(International Institutes of Acoustics and Vibration) and I-INCE(International Institutes of Noise Control Engineering).
三中全会决定E-mail:li.cheng@polyu.edu.hk
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