Modares Mechanical Engineering

Modares Mechanical Engineering

Passive control of acoustic wave transmitted through a doubly curved shell by piezoelectric material

Authors
Rahmat Shahbazi Gandomkari
Hamed Darvish Gohari
Department of Mechanical Engineering, Iran University of science and technology, Tehran, Iran
Abstract
In this work, transmitted sound power control through a doubly curved laminated shell by the aid of RL-shunt is investigated. Therefore, vibration equations of a doubly curved shell with piezoelectric layers are firstly derived utilizing Hamilton’s principle. Then, the obtained equations are verified considering the results reported by other researchers. In addition, by applying a shunt circuit, which is parallel to the piezoelectric layer, the effect of resonant shunt method in passive control of the sound transmission loss of the shell is explored. It is indicated that with applying the shunt circuit, and then tuning the circuit with the resonance frequency, the amplitude of sound transmission loss has been significantly reduced. In next step, by applying three shunt circuits, parallel with one piezoelectric layer, it is found that passive control of this doubly curved structure can decrease the sound transmitted in resonant frequency. Finally, performance of these circuits is improved by using genetic algorithm to optimize RL-shunt circuit parameters. As a prominent result, it is shown that this method has an excellent effect on improvement of sound transmission loss up to 80dB.
Keywords
passive control
doubly curved shell
shunt circuit
genetic algorithm

Subjects

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Modares Mechanical Engineering
Volume 18, Issue 7
November 2018
Pages 170-176