Abstract
Given that traditional theoretical diagnosis is difficult to use for the accurate prediction of the looseness of bolted joints, this paper will use the support vector machine (SVM) method to solve this problem. The paper establishes a database by studying the loosening mechanism of bolted joints and by collecting the connection information of the fastening points of the vehicle chassis. Key influence features are determined by the information gain value. The average prediction accuracy of the standard SVM model is 76.94 %, which is better than the theoretical diagnosis method. To achieve optimization, the feature weighted support vector machine and the multiple kernel function support vector machine (MKL SVM) are established, and the average prediction accuracy is 82.18 % and 84.19 %, respectively. The fusion weighted support vector machine (FW-MKL SVM) is built by combining the advantages of two weighted optimization SVMs. The average prediction accuracy is 94.5 %, which meets practical engineering requirements.
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Abbreviations
- H IG :
-
Information gain value of feature A
- H C/A :
-
Information weighted sum of feature A
- F(x):
-
Optimal expression of linear separable problem
- P :
-
Linear transformation matrix
- λ :
-
Weight of kernel function
- V:
-
Particle optimal velocity
- X:
-
Optimal position of particle motion
- N:
-
Total number of samples
- P:
-
Accuracy rate
- R:
-
Recall rate
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Acknowledgments
This project is supported by the local and overseas project of comparative research and application of fastener locking reliability of SAIC GM Wuling Automobile Co., Ltd.
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Chuanbo Liu was born in 1972. He is an Associate Professor at Wuhan University of Technology. He received a Ph.D. degree from Wuhan University of Technology, China in 2009. His research interests include human-robot interaction, mechanical design and theory, and vehicle thermal management.
Yanzhao Zhu is currently a Master’s degree student at the School of Mechanical and Electrical Engineering of Wuhan University of Technology in Hubei, China. His research interests are the reliability research of automotive fasteners and the optimization of automotive windows.
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Liu, C., Zhu, Y., Zhan, K. et al. Prediction of bolted joint looseness based on feature weighted-multiple kernel support vector machine. J Mech Sci Technol 35, 2407–2418 (2021). https://doi.org/10.1007/s12206-021-0512-5
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DOI: https://doi.org/10.1007/s12206-021-0512-5