Bolt looseness main influence parameter evaluation and looseness relieving method under vibration working condition

Abstract

The invention discloses a method for evaluating main influence parameters of bolt looseness under a vibration working condition and relieving the looseness of the bolt, which comprises the following steps of: setting factor levels according to the influence parameters of bolt looseness under the vibration working condition and a range, and designing parameters and a test scheme by adopting a secondary universal rotation combination method. Test process, the change of the bolt clamping force is collected by a pressure sensor; obtaining the change rule of the clamping force of bolt connection along with time at a time node, and establishing a quadratic regression mathematical model of the attenuation rate of the bolt clamping force and the looseness influence parameters to obtain the most important influence parameters of bolt looseness under the vibration working condition and the influence proportion of each factor on the bolt looseness. The clamping force attenuation rate of the regression model is optimized through the lingo, optimized parameters for relieving bolt looseness are obtained, a large amount of time and repeated test times are saved, a theoretical basis is laid for abolt looseness solution, and the optimization design for relieving bolt looseness has scientificity.

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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