Evaluation of the main influencing parameters of bolt relaxation under vibration conditions and its relaxation mitigation method

Abstract

The invention discloses a method for evaluating the main influencing parameters of bolt relaxation under vibration conditions and its relaxation reduction method. The factor level is set according to the influencing parameters and range of bolt relaxation under vibration conditions, and the parameters and tests are carried out by using the secondary general rotation combination method. Design. During the test, the change of the bolt clamping force is collected by the pressure sensor, and the change law of the clamping force of the bolted connection with time is obtained at the time node, and the quadratic regression mathematical model of the attenuation rate of the bolt clamping force and the relaxation parameter is established , to obtain the most important influencing parameters of bolt relaxation under vibration conditions and the proportion of each factor's influence on bolt relaxation. The clamping force attenuation rate of the regression model is optimized by lingo, and the optimized parameters for reducing bolt loosening are obtained, which saves a lot of time and repeated trials, lays a theoretical foundation for the solution of bolt loosening and makes the bolt loosening The optimized design is scientific.

Description

technical field [0001] The invention relates to an evaluation of parameters mainly affecting bolt relaxation under vibration working conditions and a method for reducing the relaxation, belonging to the field of mechanical engineering. Background technique [0002] Bolt is a typical mechanical fastener commonly used in the engineering field. Due to the existence of vibration and alternating load environment during the service of its connection system, especially when the bolt connection in the rotating mechanism is under the combination of dynamic tension, compression and shear When under load, the bolted connection is more likely to loosen, and the bolt pre-tightening force will loosen, resulting in the failure of the bolted connection structure. Statistical findings show that the factors affecting bolt connection relaxation involve machining methods, assembly processes, material mechanical properties, and working environment, and their coupling effects intensify the bolt r...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the technical deficiency that the parameters affecting bolt relaxation cannot be evaluated under current vibration conditions, and to provide a secondary universal rotation combination method to evaluate the main parameters affecting bolt relaxation, and to slow down bolts under vibration conditions through lingo The optimal combination of the three influencing parameters of relaxation effectively reduces test time and material consumption

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