振动响应传递率的动力学特性研究及其在工作模态分析中的应用

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摘要振动响应传递率描述了多自由度系统中各自由度响应之间的关系,近年来在多个领域得到了广泛的应用，特别是在工作模态分析方面，获得了瞩目的应用成果。但对于振动响应传递率的动力学特性，一直缺乏完整的、系统的分析。为此，将从振动响应传递率的基础概念出发，对不同输入情况下，振动响应传递率在系统零极点的特性和对系统输入的依赖性进行解析推导分析；然后，通过数值算例对振动响应传递率的特性进行仿真验证；最后，应用振动响应传递率对非白噪声激励下梁结构的工作模态进行了辨识，表明基于振动响应传递率的工作模态分析方法能够避免虚假模态对辨识结果的影响。

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	李星占1
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	董兴建2
	岳晓斌1
	黄文1
	彭志科2

关键词 ：振动传递率, 系统零极点, 工作模态分析, 虚假模态

Abstract：Vibration response transmissibility describes the relationships of responses of each position in muti-degree of freedom (MDOF) system. It has been widely used in many fields, and has achieved remarkable application especially in operation modal analysis. But, there still lacks the systematic analysis about the dynamic characteristics of vibration transmissibility. Based on the definition of vibration transmissibility, this paper analyzes the characteristics of transmissibility at zeros and poles of system, and discusses the independence of transmissibility to the system input using analytic derivation. Then, numerical cases are used to validate these characteristics. Finally, vibration transmissibility are applied to identify the modal parameters of beam structure under non-white excitations. The results showed that transmissibility based operational modal analysis method could avoid the influence of harmonic modal.

Key words： vibration transmissibility zeros and poles operational modal analysis harmonic modal

收稿日期: 2017-11-07 出版日期: 2019-04-28

引用本文:

李星占1,2，董兴建2，岳晓斌1，黄文1，彭志科2. 振动响应传递率的动力学特性研究及其在工作模态分析中的应用[J]. 振动与冲击, 2019, 38(9): 62-70.
LI Xingzhan1,2,DONG Xingjian2, YUE Xiaobin1, HUANG Wen1, PENG Zhike2. Dynamic characteristics of vibration response transmissibility and its application in operational modal analysis. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(9): 62-70.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2019/V38/I9/62

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