TY - JOUR T1 - Passive control of acoustic wave transmitted through a doubly curved shell by piezoelectric material TT - کنترل غیرفعال امواج آکوستیکی گذرنده از یک پوسته دو انحنایی به کمک مواد پیزوالکتریک JF - mdrsjrns JO - mdrsjrns VL - 18 IS - 7 UR - http://mme.modares.ac.ir/article-15-16465-en.html Y1 - 2018 SP - 170 EP - 176 KW - Passive control KW - doubly curved shell KW - shunt circuit KW - genetic algorithm N2 - 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. M3 ER -