Research on Vibration Transfer Characteristics of the Bolt Connection Structure
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TECHNICAL ARTICLE—PEER-REVIEWED
Research on Vibration Transfer Characteristics of the Bolt Connection Structure Yong-xiang Zhang . Dan-chen Zhu . Shuai Zhang . Yuan-ping Qian
Submitted: 26 July 2016 / in revised form: 11 October 2016 / Published online: 29 November 2016 Ó ASM International 2016
Abstract Bolt pre-tightening force and the characteristics of contact surfaces have great influence on structural modes and transfer functions, which are usually ignored due to the difficulty in treatment. Using the ANSYS Workbench software, the finite element model of the whole structure and the bolt connection structure are established, and the vibration modes and harmonic responses in different structures are investigated. By comparing the finite element calculation data and test data, the influence of bolt connection structure is analyzed. Comparing the results when the bolt pre-tightening force is varied, the results show that the natural frequencies of bolt connection structure decrease compared with the whole structure. The transfer characteristics of the system are influenced by the pre-tightening force, and the natural frequencies increase with the increase in pre-tightening force. Keywords Bolt connection structure Finite element simulation Transfer characteristics
Introduction Bolt connection structure is widely used in machine tool, diesel engine, gas turbine, and other engineering machinery. The contact surface formed by bolt connection structure makes the stiffness of the contact area change, Y. Zhang D. Zhu (&) S. Zhang Department of Power Engineering, Naval University of Engineering, Wuhan 430033, China e-mail: [email protected] Y. Qian Sha Zhou Professional Institute of Technology, Suzhou 215600, Jiangsu, China
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and at the same time, the existence of the bolted joints could change the local flexibility and damping [1], so as to change the whole structure’s dynamic characteristics, which have a great impact on the signal extraction in the process of fault diagnosis. In the process of dynamic simulation analysis of the mechanical structure, because the bolts are numerous which are difficult to deal with, the influence of the bolt connection structure is often ignored. The bolt connection structure parts is seemed as rigid connection, which ignore the influence of contact stiffness and damping on the vibration characteristics. The research on some parts of the aero engine demonstrates that neglecting the nonlinear components in the assembly will result in a reduction in the reliability of the analysis results. Therefore it is necessary to improve the model to be included in a relevant experimental study [2]. Finite element model is often used in the dynamic simulation of assembly model to ensure an effective treatment of bolt structure. The method is mainly divided into the nonlinear contact algorithm and the interface element method [3, 4]. In the process of calculation, the former estimates the contact state through the contact algorithm constantly, which leads to a large amount of calculatio
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