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research-article

Underwater acoustic absorption of composite anechoic layers with inner holes

[+] Author and Article Information
Changzheng Ye

No.28, Xianning West Road Xi'an, Shaanxi Province 710049 China fxxin@mail.xjtu.edu.cn

Xuewei Liu

No.28, Xianning West Road Xi'an, Shaanxi Province 710049 China hengyan029@163.com

Fengxian Xin

No.28, Xianning West Road Shaanxi Province Xi'an, 710049 China fengxian.xin@gmail.com

Tianjian Lu

No.28, Xianning West Road Xi'an, 710049 China lixihku@163.com

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the Journal of Vibration and Acoustics. Manuscript received April 12, 2018; final manuscript received February 16, 2019; published online xx xx, xxxx. Assoc. Editor: A. Srikantha Phani.

ASME doi:10.1115/1.4042935 History: Received April 12, 2018; Accepted February 17, 2019

Abstract

A combined theoretical and numerical study is carried out to quantify the influence of material properties (e..g, real part and loss factor of Young's modulus, material density) and geometrical parameters (e.g., layer thickness, height of hole) on the sound absorption performance of an underwater rubber layer containing periodically distributed axial holes. A theoretical modal is developed based on the method of transfer function as well as the concept of equivalent layering of holes with variable cross-section. Numerical simulations with the method of finite elements are subsequently carried out to validate the theoretical model, with good agreement achieved. Physical mechanisms underlying the enhanced acoustic performance of the anechoic layer as a result of introducing the periodic holes are explored in terms of the generated transverse waves and the high order mode of vibration. The results presented are helpful for designing high-performance underwater acoustic layers with periodically distributed cavities by tailoring relevant material properties and geometrical parameters.

Copyright © 2019 by ASME
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