Page 41 - 《应用声学》2021年第4期

第 40 卷 第 4 期 Vol. 40, No. 4
2021 年 7 月 Journal of Applied Acoustics July, 2021

⋄ 研究报告 ⋄

含周期性空腔结构吸声机理的研究 ∗

罗英勤 1 楼京俊 1 张焱冰 1† 李静茹 2

(1 海军工程大学舰船与海洋学院 武汉 430000)
(2 海南大学机电工程学院 海口 570100)

摘要：为了研究水下含周期性空腔结构的吸声机理，建立并验证了含轴对称空腔周期性结构吸声特性计算的
简化有限元仿真方法，用简化的有限元模型结合遗传算法对水下环境含周期性圆柱空腔结构的吸声性能进行
了优化设计。从能量耗散、变形和模态的角度分析了含周期性空腔结构的吸声机理。空腔结构谐振包括表层
的弯曲振动和空腔附近的径向变形，且径向运动也是随吸声结构厚度变化的。相对低频区主要激起表层振动
模态，高频区激起径向运动模态，且径向振动对声学性能影响很大，其更有利于促进纵波转化为能量更易消散
的横波。
关键词：吸声机理；周期性结构；圆柱空腔；优化设计；简化模型
中图法分类号: TB56 文献标识码: A 文章编号: 1000-310X(2021)04-0525-07
DOI: 10.11684/j.issn.1000-310X.2021.04.005

Sound-absorption mechanism of structures with periodic cavities

LUO Yingqin 1 LOU Jingjun 1 ZHANG Yanbing 1 LI Jingru 2

(1 College of Naval Architecture and Ocean Engineering, Naval University of Engineering. PLA, Wuhan 430000, China)
(2 College of Mechanical and Electrical Engineering, Hainan University, Haikou 570100, China)

Abstract: A simplified finite element method (FEM) simulation method has been established and validated
for analyzing the sound absorption mechanism of periodic structures with axisymmetric cavities. Combined
with genetic algorithm, the simplified FEM method is used to optimize the sound absorption coefficient of the
structure containing periodic cylindrical cavities. Through energy dissipation, structure deformation and modal
analysis of the optimized absorption structure, it is found that the cavity structure resonances include bending
vibration of the surface layer and radial motion of particles near the cavities. The radial motion also changes
with the thickness variation of the structure. The bending vibration modes of the surface layer are mainly and
easily excited at relatively low frequencies and the radial motion modes are major excited at relatively high
frequencies. The radial vibration has a great influence on absorption performance, which is more conducive to
promoting the conversion of longitudinal waves into transverse waves with more energy dissipation.
Keywords: Sound absorption mechanism; Periodic structure; Cylindrical cavity; Optimized design; Simplified
model

2020-10-09 收稿; 2020-12-20 定稿
国家自然科学基金项目 (51909050)
∗
作者简介: 罗英勤 (1990– ), 女, 湖北武汉人, 博士研究生, 研究方向: 水下结构声学性能设计。
† 通信作者 E-mail: HjgChy001@126.com