Evaluation of bolted joints tightening force based on characteristic parameters

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (4) : 121-128.

LUO Wenfeng1，YU Ling1,2

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Abstract

In order to solve the ill-posed problem in characteristic parameters identification of bolted joints,the positive problem solving idea was adopted that an objective function was proposed for parameters identification based on the dynamic equations.In addition,the characteristic parameters were used to evaluate the bolt tightening force quantitatively.Firstly,the linear model of bolted joint was constructed and frequency response functions under different bolt tightening force were measured in model test.After obtaining the objective function,the particle swarm algorithm was used to identify the characteristic parameters under different bolt tightening force.The fitting curve for characteristic parameters and bolt tightening force was obtained and used to evaluate the bolt tightening force quantitatively.Finally,the validity and applicability of proposed method was verified by a series of numerical simulations and experimental studies.The illustrated results show that the proposed method can identify parameters accurately,and the fitting curve can be used to evaluate the bolt tightening force reliably.

Key words

bolted joint / bolt tightening force / parameters identification / structural health monitoring

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LUO Wenfeng1，YU Ling1,2. Evaluation of bolted joints tightening force based on characteristic parameters[J]. Journal of Vibration and Shock, 2019, 38(4): 121-128

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