Finite element dynamic modeling for bolted thin plate structure based on complex spring element with non-uniform distribution

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (13) : 111-119.

LIU Xiaofeng1,2, SUN Wei1,2, FANG Ziwen1,2

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Abstract

How to effectively simulate contribution of bolt influence zone to structural dynamic characteristics is very important when establishing dynamic model of bolted structures. Here, a complex spring element with non-uniform distribution was proposed to simulate mechanical characteristics of bolt influence zone. Then, a finite element model for a bolted thin plate structure was established and its linear dynamic analysis was performed. On the basis of determining the area of bolt influence zone, 3 kinds of complex spring elements with non-uniform stiffness distribution were assumed to simulate mechanical characteristics of a bolt joint, and the method of using the backstepping identification technique to determine stiffness and damping parameters of a complex spring element was proposed. The linear dynamic analysis model of bolted thin plate structure was established with a self-developed finite element program to mainly describe the method of introducing the complex spring element with non-uniform distribution into the dynamic equation of bolted thin plate structure. Finally, an example of a bolted thin plate structure was studied. The results showed that natural frequencies, modal shapes and frequency response functions computed with the established finite element model are closer to the actually measured values; using complex spring element with non-uniform distribution to simulate bolt influence zone and then perform finite element modeling can achieve higher simulation accuracy.

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non-uniform distribution / complex spring element / bolted thin plate / dynamics / finite element modeling

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LIU Xiaofeng1,2, SUN Wei1,2, FANG Ziwen1,2. Finite element dynamic modeling for bolted thin plate structure based on complex spring element with non-uniform distribution[J]. Journal of Vibration and Shock, 2021, 40(13): 111-119

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