Investigation of Acoustic Manipulation by Layered Periodic Composites

doi:10.3901/JME.2017.06.010

Abstract

Abstract:

According to the practical demand of engineering for acoustic isolation, a special kind of one-dimensional (1D) layered periodic structure, total-reflective structure, is proposed. The theoretical model of 1D layered periodic structure and the completely elastic finite element model of acoustic wave propagation are established. Applying transfer matrix method, the acoustic characteristics of the structure are studied and its impact to acoustic wave propagation is analyzed, including band structure and transfer characteristic. Based on the design requirement, the mathematical model of total-reflective structure is established, including optimal object, design variables and constraints. Adopting genetic algorithm, the complete system and detailed method of design are proposed. Using the proposed method, a steel/aluminum structure with five layers is designed. And the ultrasonic platform for ultrasonic wave during 900-1 200 kHz is set up to test the propagation characteristics of steel five-layered structure, aluminum five-layered structure and steel/aluminum five-layered structure respectively. From the contrasting test, the reflection capability of the designed structure and the feasibility of total-reflective structure are verified.

Key words: layered periodic structure, total-reflective structure, transfer matrix method, acoustic isolation

ZHU Xiaohui, LI Longqiu, ZHANG Guangyu, ZHOU Qiang, WU Yingdan, QIAO Jing. Investigation of Acoustic Manipulation by Layered Periodic Composites[J]. Journal of Mechanical Engineering, 2017, 53(6): 10-15.

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