Damping Prediction Technique of the Bolted Joint Structure Considering Pretension Force

Delin Sun, Ridong Liao*
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China.

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© 2015 Sun and Liao;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


At the initial phase of the mechanical product development, it is very important to effectively obtain the modal damping ratio of the bolted joint structure for accurately predicting dynamic response. The energy dissipation has been estimated using a finite element model incorporating the effect of pretension force of the bolted joint. First, the modal damping ratios of the first four modes are extracted by experimental method. Secondly, the lap joint finite element model with pretension force parameter is constructed and based on which, modal analysis of the structure is conducted. The modal shape scaling results are used as the boundary conditions of the finite element model and the energy dissipations and modal damping ratios of the lap joint under different pretension forces are calculated out. By comparing the numerical calculation result and the experimental result, the validation of the damping prediction approach proposed in this paper is proved.

Keywords: Bolted joint structure, finite element method, modal damping, pretension force.