Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (2): 392-399.doi: 10.13229/j.cnki.jdxbgxb20211154

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Fault diagnosis method of NC turret based on PSO⁃SVM and time sequence

Wei LUO1,2(),Bo LU3,Fei CHEN4(),Teng MA1,2   

  1. 1.Key Laboratory of CNC Equipment Reliability，Ministry of Education，Jilin University，Changchun 130022，China
    2.College of Mechanical and Aerospace Engineering，Jilin University，Changchun 130022，China
    3.Changchun Equipment & Technology Research Institute，Changchun 130012，China
    4.Sino-German College of Intelligent Manufacturing，Shenzhen Technology University，Shenzhen 518118，China
  • Received:2021-11-04 Online:2022-02-01 Published:2022-02-17
  • Contact: Fei CHEN E-mail:luoweicn@jlu.edu.cn;chenfei@sztu.edu.cn

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Abstract:

A fault diagnosis method of NC turret based on particle swarm optimization and support vector machine （PSO-SVM） is proposed. Firstly， the NC turret is divided into five subsystems， and a working cycle is divided into four time sequences T1， T2， T3 and T4. Secondly， the feature extraction methods of vibration， motor current， oil pressure and proximity switch signal in different time sequences of NC turret are explored. Finally， fault diagnosis method of NC turret based on PSO-SVM was proposed， and NC turret fault tests were carried out in different time sequences. According to the fault data， support vector machine （SVM） and PSO-SVM fault diagnosis methods are compared and verified. The results show that the fault diagnosis accuracy of T2， T3 and T4 are increased by 28%， 23% and 5%， respectively， which verifies the validity of the proposed fault diagnosis method. The fault diagnosis method proposed in this paper is not only suitable for NC turret， but also provides a new idea for the fault diagnosis of other complex electromechanical system.

Key words: NC turret, support vector machine, particle swarm optimization, time sequence, fault diagnosis

CLC Number: 

  • TH133.33

Fig.1

NC turret subsystem division diagram"

Fig.2

NC turret working period signal"

Fig.3

A working cycle signal of NC turret diagram"

Table 1

Key subsystem and sensitive signal table of NC turret in different sequence"

时序环节关键子系统敏感信号
T1液压子系统、发讯子系统油压信号、振动、接近开关信号
T2驱动子系统、传动子系统电流、振动
T3发讯子系统、液压子系统、辅助结构子系统油压信号、振动、接近开关信号
T4辅助结构子系统振动

Fig.4

Steps of PSO-SVM"

Fig.5

NC turret PSO-SVM fault diagnosis process diagram"

Fig.6

NC turret reliability test system"

Fig.7

Fault test in T1 and T2"

Fig.8

Fault test in T3"

Fig.9

Turret holder clamping loose test in T4"

Fig.10

Fault diagnosis results based on PSO-SVM in T1"

Fig.11

Fault diagnosis results based on PSO-SVM in T2"

Fig.12

Fault diagnosis results based on PSO-SVM in T3"

Fig.13

Fault diagnosis results based on PSO-SVM in T4"

Table 2

SVM and PSO-SVM model diagnosis results"

时序环节测试样本数SVMPSO-SVM准确率
Cγ诊断准确率/%Cγ诊断准确率/%
T12410.07100.0043.09940.01100.00
T23210.0778.1378.01006.74100.00
T33610.0777.7811.83910.0195.84
T44010.0795.0070.08000.01100.00
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