流场中填充吸声材料夹层板结构与声腔的耦合特性

doi:10.3901/JME.2016.05.177

机械工程学报 ›› 2016, Vol. 52 ›› Issue (5): 177-184.doi: 10.3901/JME.2016.05.177

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流场中填充吸声材料夹层板结构与声腔的耦合特性

宁少武¹, 史治宇¹, 李晓松²

1. 南京航空航天大学机械结构力学及控制国家重点实验室南京 210016;
2. 中国运载火箭研究院北京 100076

出版日期:2016-03-05 发布日期:2016-03-05
作者简介:宁少武,男,1985年出生,博士研究生。主要研究方向为飞行器噪声与振动控制。E-mail：swning@qq.com;史治宇(通信作者),男,1967年出生,教授,博士研究生导师。主要研究方向为参数识别方法,损伤诊断。E-mail：zyshi@nuaa.edu.cn
基金资助:
* 江苏省普通高校研究生科研创新计划(CXZZ13_0147)、国家自然科学基金(11172131, 11232007)、中央高校基本科研业务费专项资金和江苏高校优势学科建设工程资助项目

Performance of Vibro-acoustic Coupling of the Sandwich Structure with Absorptive Material and Cavity in External Convected Fluids

NING Shaowu¹, SHI Zhiyu¹, LI Xiaosong²

1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016;
2. China Academy of Launch Vehicle Technology, Beijing 100076

Online:2016-03-05 Published:2016-03-05

摘要/Abstract

摘要： 采用等效流体模拟吸声材料,建立外部流场作用下填充吸声材料夹层板结构与封闭空间声场的声振耦合模型,应用波动分析方法研究结构的声透射性能,分析入射声波入射角和方位角、流场流速和流向、夹层板几何尺寸和声腔深度等参数对填充吸声材料夹层板结构声振耦合特性的影响。计算分析表明吸声材料提高了结构的隔声性能;结构的隔声性能随着面板厚度和夹层厚度的增加而提高,且“板-等效流体-板”共振频率向低频移动;随着入射角、方位角、马赫数和空腔深度的变化改变了结构的隔声性能,驻波衰减频率和驻波共振频率随入射角和方位角的增大向高频移动,随空腔深度的增加向低频移动,顺流入射时随马赫数的增加向低频移动,而逆流入射时则移向高频。

关键词: 等效流体模型, 夹层板结构, 吸声材料, 驻波共振频率, 驻波衰减频率

Abstract: An equivalent fluid model is employed to characterize the absorption of sound in the sound absorptive material. A vibro-acoustic coupling model of the sandwich structure with absorptive material and cavity in convected fluids is developed. The performance of sound transmission is obtained by employing the wave approach. The effects factors of vibro-acoustic responses which were researched include incident elevation angles and azimuch angles, the velocity and direction of convected flow, the geometrical dimensions of the double panels and the depth of the cavity. Studies have shown that the insulation of an structure with absorption than air is improved; sound transmission loss increases with the thickness of the up and low panel and the gap increase and the panel- equivalent fluid-panel resonance shift to lower frequencies; the parametric variation of incident elevation angles and azimuch angles, Mach number and the depth of the cavity changed the performance of sound Transmission of the structure; standing-wave attenuation frequency and standing-wave resonance frequency shift to higher frequencies with the increasing of incident angles and azimuch angles and lower frequencies with the increasing of the depth of the cavity; standing-wave attenuation frequency and standing-wave resonance frequency shift to lower frequencies with the increase of Mach number when the sound is incident in the downstream but shift to higher frequencies with the increase of Mach number when the sound is incident in the upstream.

Key words: absorptive material, equivalent fluid model, sandwich structure, standing-wave attenuation frequency, standing-wave resonance frequency

中图分类号:

TB535

宁少武, 史治宇, 李晓松. 流场中填充吸声材料夹层板结构与声腔的耦合特性[J]. 机械工程学报, 2016, 52(5): 177-184.

NING Shaowu, SHI Zhiyu, LI Xiaosong. Performance of Vibro-acoustic Coupling of the Sandwich Structure with Absorptive Material and Cavity in External Convected Fluids[J]. Journal of Mechanical Engineering, 2016, 52(5): 177-184.

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流场中填充吸声材料夹层板结构与声腔的耦合特性

Performance of Vibro-acoustic Coupling of the Sandwich Structure with Absorptive Material and Cavity in External Convected Fluids

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