A study on the identification of joints dynamic stiffness based on modal analysis

被引：0
|
作者：
Dong G. [1 ]
Yin Q. [1 ]
Liu Y. [1 ]
Yin G. [1 ]
机构：
[1] School of Manufacturing Science and Engineering, Sichuan University, Chengdu
来源：
Yin, Qin | 1600年 / Chinese Vibration Engineering Society卷 / 36期
关键词：
Dynamic; Joints; Modal analysis; Stiffness;
D O I：
10.13465/j.cnki.jvs.2017.20.020
中图分类号：
学科分类号：
摘要：
Accurate identification of the dynamic information is an important prerequisite for the combination of structural dynamics modeling. In this paper, the method of the dynamic stiffness identification was studied based on the theory of modal analysis. Firstly, we constructed a generalized dynamics model containing the dynamic information, discussed the characteristics of the joint dynamics from the theory of modal analysis influencing between the natural frequency and the combination structure and established the relationship between them. Furthermore, we built an ideal finite element model by the mass and spring-damper and identified the joint stiffness by the natural frequency obtained by numerical analysis. The maximum error between the identification and the theoretical value was 1.92%. At last, we applied modal test on bolt joints, the measured natural frequency of the typical mode of vibration in normal and tangential direction as the index, through the MATLAB-ANSYS integration platform to identify the bolt joint stiffness. Moreover, the obtained results were input to the finite element model. The maximum error between the predicted value and measured value was 3.01%. The numerical value and the test value were all ideal, demonstrating the feasibility of the method. At the same time, the dynamic stiffness identified by the measured natural frequency of the typical mode of vibration was a very good predictor of other order natural frequency distribution of the bolt connection structure, demonstrating that the bolt in a larger pretightening force; dynamic characteristics met the linear assumption. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：125 / 131
页数：6
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