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Journal of Tsinghua University(Science and Technology)    2017, Vol. 57 Issue (9) : 975-979     DOI: 10.16511/j.cnki.qhdxxb.2017.26.050
MECHANICAL ENGINEERING |
Tool wear state recognition based on LS-SVM with the PSO algorithm
LIU Chengying1,3, WU Hao2, WANG Liping1,3, ZHANG Zhi4
1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;
2. School of Mechatronics Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China;
3. Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control, Tsinghua University, Beijing 100084, China;
4. Department of Aircraft Engineering, Navy Aeronautical Engineering Academy, Yantai 264001, China
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Abstract  A tool wear state monitoring system was developed based on acoustic emissions to monitor the tool wear state. Typical acoustic signals were analyzed to determine the square root amplitude, absolute mean, mean square error and maximum sound level from the time domain to characterize the tool wear. Neural networks can easily fall into a local minimum and have slow learning convergence rates so a tool wear state recognition method was developed based on a least square support vector machine (LS-SVM). The LS-SVM performance depends on the penalty factor and the kernel parameter, so a particle swarm optimization algorithm was used to automatically optimize the LS-SVM parameters. The optimized LS-SVM model is then shown to be more accurate than the basic LS-SVM model.
Keywords tool wear condition recognition      time domain feature      least square support vector machine (LS-SVM)      particle swarm optimization (PSO) algorithm     
ZTFLH:  TP277  
Issue Date: 15 September 2017
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LIU Chengying
WU Hao
WANG Liping
ZHANG Zhi
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LIU Chengying,WU Hao,WANG Liping, et al. Tool wear state recognition based on LS-SVM with the PSO algorithm[J]. Journal of Tsinghua University(Science and Technology), 2017, 57(9): 975-979.
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http://jst.tsinghuajournals.com/EN/10.16511/j.cnki.qhdxxb.2017.26.050     OR     http://jst.tsinghuajournals.com/EN/Y2017/V57/I9/975
  
  
  
  
  
  
  
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