Research on Identification of Joints Dynamic Stiffness based on Modal Analysis

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (20) : 125-131.

DONG Guanhua YIN Qin LIU Yun YIN Guofu

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Abstract

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 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 elements model. The maximum error between the predicted value and measured value was 3.01%. The numerical value and the test value were all rather 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 bolt connection structure, demonstrating that the bolt in a larger pretightening force; dynamic characteristics met the linear assumption.

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dynamic / joints / stiffness / modal analysis

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DONG Guanhua YIN Qin LIU Yun YIN Guofu . Research on Identification of Joints Dynamic Stiffness based on Modal Analysis[J]. Journal of Vibration and Shock, 2017, 36(20): 125-131

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