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结构声腔耦合系统的振型耦合特征初探

发表时间:2019-04-30  浏览量:302  下载量:10
全部作者: 高书娜
作者单位: 西南大学工程技术学院
摘 要: 鉴于车内低频噪声降低措施的快速提出受限于现有方法的缺陷,开展车内低频噪声的快速控制方法研究,讨论结构声腔的振型耦合特征。首先基于振型耦合系数的计算公式,以结构声腔的振型均可直接用公式计算的耦合系统为对象,分别推导并定义了结构振型复杂系数、声腔振型复杂系数;然后定义结构声腔的振型相似系数,进而基于定义的结构振型复杂系数、声腔振型复杂系数、结构声腔的振型相似系数,提出了一种新的振型耦合系数计算公式,验证其精度后,根据新公式分析了结构声腔的振型耦合特征;最后借助有限元法计算了某形状不规则耦合系统的振型耦合系数,分析后发现所得振型耦合特征在该耦合系统中仍然成立。研究结果表明:随着结构、声腔各阶振型节线数的增加,结构和声腔振型在耦合面上对应边节线数之差的增加,结构声腔振型耦合呈减弱趋势。
关 键 词: 公路运输;结构声腔振型耦合;关键参数;解析法;节线数
Title: Study on mode shape coupling features of structural-acoustical coupled systems
Author: GAO Shuna
Organization: College of Engineering and Technology, Southwest University
Abstract: Fast putting forward improvements for car interior low frequency noise was limited by shortcomings of existing methods. So, the study on a fast control method of car interior low frequency noise was carried out. The features of mode shape coupling between structure and acoustic cavity were studied. Firstly, based on the formula of mode shape coupling coefficients, taking the coupled system, whose structure and acoustic modes can be directly calculated by formulas, as the research object, the mode shape complex coefficients of structure and acoustic cavity were derived and defined respectively. Secondly, the mode shape similarity coefficient was defined. Thus, based on the mode shape complex coefficients of structure and acoustic cavity, and the mode shape similarity coefficient between structure and acoustic cavity, a new formula to calculate the mode shape coupling coefficient was presented. After verification, this new formula was used to analyze the features of mode shape coupling between structure and acoustic cavity. Finally, by finite element methods, the mode shape coupling coefficient of an irregular shaped coupled system was computed. After analysis, the achieved features of mode shape coupling were found to be still right in this coupled system. Results showed that mode shape coupling between structure and acoustic cavity tends to decrease with the increasing of node line number of structural and acoustic modes, and with the increasing of node line number difference between structural and acoustic modes on their coupling surfaces.
Key words: road transport; mode shape coupling between structure and acoustic cavity; key parameters; analytic method; node line number
发表期数: 2019年4月第2期
引用格式: 高书娜. 结构声腔耦合系统的振型耦合特征初探[J]. 中国科技论文在线精品论文,2019,12(2):310-319.
 
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