Reliability Analysis of Grinding Head Bolt Group System of Grinding Robot

doi:10.12068/j.issn.1005-3026.2023.12.006

Abstract

Abstract: In the whole structure connected by bolt group， the reliability of the bolt group directly affects the reliability of the whole structure. The traditional reliability analysis method of the bolt group considers that the bolt parameters are determined， but in actual working conditions， the bolt parameters are uncertain， resulting in a large error. In order to accurately evaluate the reliability of the bolts group， taking a grinding robot grinding head bolt group as an example， a finite element analysis model of the grinding head is establisted. This model is used for static analysis. The accuracy of the bolt connection finite element mesh model is verified by the bolt connection experiment. The bolt group is regarded as a system， and the influence of the bolt parameter randomness is considered. The limit state function is established based on whether the maximum stress value of the bolt exceeded the yield limit. The reliability analysis is carried out by combining the Kriging model fitting method， and then the variation rule of the system reliability with the bolt preload is explored. The results show that the reliability of the bolt system is affected by random factors and determined by multiple bolts， and decreases with the increase of the bolt preload.

Key words: machine design; bolt group connection; statics; system reliability; Kriging model

CLC Number:

TH133.3

HUANG Xian-zhen， ZHANG An-xing， SUN Kai-bo. Reliability Analysis of Grinding Head Bolt Group System of Grinding Robot[J]. Journal of Northeastern University(Natural Science), 2023, 44(12): 1712-1719.

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