结构声腔耦合系统的振型耦合特征初探

高书娜

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结构声腔耦合系统的振型耦合特征初探

首发时间：2018-10-11

高书娜 ¹
高书娜（1980-），女，副教授，主要研究方向：汽车振动噪声控制

1、西南大学工程技术学院，重庆 400716

摘要：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，即车身噪声薄弱区域的锁定难度高、结构加强措施的提出耗时长，因此开展车内低频噪声的快速控制方法研究，通过分析腔内低频声压的关键参数即振型耦合系数的特点，研究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，随着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：车辆工程结构声腔振型耦合振型复杂系数振型相似系数节线数

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Study on mode shape coupling features of structural-acoustical coupled systems

GAO Shuna ¹
高书娜（1980-），女，副教授，主要研究方向：汽车振动噪声控制

1、College of Engineering and Technology, Southwest University, Chongqing 400716

Abstract：Fast putting forward improvements for low car interior low frequency noise is limited by shortcomings of existing methods, which are high difficulty to spot weak area of car body and time-consuming for structure improvements. So, the study of a fast control method of low frequency noise in cars was carried out. Though analyzing the characterstics of the primary factor of car interior low frequency sound pressure, which is the mode shape coupling coefficient, 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 coefficient of structure and acoustic cavity were derived and defined respectively. Secondly, the mode shape similarity coefficient was defined. Based on the mode shape complex coefficient of structure, the mode shape complex coefficient of 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. The features of mode shape coupling achieved was found to be still right in this coupled system. Results show 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.

Keywords： vehicle engineering mode shape coupling between structure and acoustic cavity mode shape complex coefficient mode shape similarity coefficient node line number

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高书娜. 结构声腔耦合系统的振型耦合特征初探[EB/OL]. 北京：中国科技论文在线 [2018-10-11]. https://www.paper.edu.cn/releasepaper/content/201810-22.

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论文编号	201810-22
论文题目	结构声腔耦合系统的振型耦合特征初探
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