Session: 06-15-04 Unsteady Hydrodynamics, Vibrations, Acoustics and Propulsion IV

Paper Number: 130251

130251 - Analysis on Vibration Suppression Performance of an Attached Acoustic Black Hole Composite Beam 

Attaching damping to structures is a common vibration suppression measure. Different from attaching uniform thickness damping, this paper proposes an acoustic black hole damping. There is an internal cavity between the base layer and the damping layer. The thickness of the internal cavity is designed to vary according to a power index gradient, forming an attached acoustic black hole composite beam. Combined with energy and virtual spring method, a theoretical model of acoustic black hole composite beam following the Euler-Bernoulli beam theory is established to calculate its vibrational response. At the same time, the finite element method is utilized to compute the vibrational response of the attached acoustic black hole composite beam. The accuracy of the theoretical model is verified by comparing the theoretical results with the finite element results. From the comparison, it can be found that the vibration displacement level of the output end of the acoustic black hole composite beam moves towards high frequency, the peak response value is lower than that of the uniformly damped beam, and the attenuation frequency interval is shifting to the high frequency in the vibration displacement transfer response curve. It can be concluded that the acoustic black hole composite beam exhibits better vibration suppression performance than that of the uniformly damped beam with identical damping thickness.

Presenting Author: Xinru Liu Huazhong University of Science and Technology

Presenting Author Biography: My name is Liu Xinru, currently studying in Huazhong University of Science and Technology. My research fields is structural vibration and sound radiation.The title of my thesis is analysis on vibration suppression performance of an attached acoustic black hole composite beam.

Authors:

Xinru Liu Huazhong University of Science and Technology
Junyong Fu China Ship Development and Design Center
Zhiwei Wan Huazhong University of Science and Technology
Tianyun Li Huazhong University of Science and Technology
Xiang Zhu Huazhong University of Science and Technology