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2015 年 10 月 13 日
Seminar - A tunable duct silencer using dielectric elastomer actuators by Dr. Lu Zhenbo

Date: 13 October 2015 (Tuesday)

Time: 11:00 am – 12:00 pm

Venue: EF305, The Hong Kong Polytechnic University

Abstract:

A duct silencer with tunable acoustic characteristics is presented. Dielectric elastomer, a smart material with lightweight, high elastic energy density and large deformation under high DC/AC voltages, was used to fabricate this duct silencer. The acoustic performances and tunable mechanisms of this duct silencer were experimentally investigated. It was found that all the resonance peaks of this duct silencer could be adjusted using external control signals without any addition mechanical part, thus it has a great potential to absorb broadband noise for practical applications. The physics of the tunable mechanism is further discussed based on the electro-mechanical interactions using finite element analysis. The present promising results also provide insight into the appropriateness of the duct silencer for possible use as a new generation broadband acoustic treatment device to replace the traditional acoustic treatment.

Bio-sketch:

Dr. Lu Zhenbo is currently a Research Scientist in the Temasek Laboratories, National University of Singapore. He obtained his Bachelor degree in Flight Vehicle Propulsion from Beijing University of Aeronautics and Astronautics, 2003, Master of Engineering in Aerospace Propulsion Theory and Engineering from Beijing University of Aeronautics and Astronautics, 2006, Doctor of Philosophy in Mechanical Engineering from the Hong Kong Polytechnic University, 2012. His research interests include UAV/MAV noise and vibration control, active flutter control, fluid-structure interaction, soft smart actuators, acoustic liner design, impedance identification.