Research Article

Rolling Bearing Degradation State Identification Based on LPP Optimized by GA

Table 3

Result of the rolling bearing degradation state identification.

Real stateSample numberNormal stateSlight degradationSevere degradationFailure stateRecognition result
LPPGA-LPPLPPGA-LPPLPPGA-LPPLPPGA-LPPLPPGA-LPP

Normal state10.82670.87430.48360.32410.12560.25200.35450.2147
20.85800.89750.33480.23340.20530.26830.27700.2091
30.91810.92900.35800.21810.27840.16820.29010.2412
40.61870.84520.78200.24520.30290.13140.34320.3455×
50.90360.93420.20280.14650.21130.21010.19820.1136

Slight degradation60.75780.17500.59780.90120.22140.10180.30100.2071×
70.26770.22050.88880.90010.20360.18150.23500.2274
80.26600.18270.84220.91260.21510.13120.28550.2562
90.27900.19210.82410.90750.23820.18330.22870.1821
100.23950.22750.84610.89250.21080.20630.29560.2632

Severe degradation110.15060.12310.24870.21960.86750.91960.32520.1753
120.22160.21000.31500.24730.60150.88250.77570.2104×
130.20670.11430.28210.22350.82260.83330.28620.2690
140.19220.18130.24210.21930.84830.87770.29880.2734
150.12320.11120.17260.18530.87930.91690.22760.2112

Failure state160.13840.10280.20050.17140.23080.21580.89030.9072
170.17660.14330.19380.15260.24570.22640.89000.9157
180.18450.16640.15840.16870.22830.20410.87750.8909
190.18700.16590.14260.15850.20120.19930.90630.9305
200.19850.17530.22320.20540.21060.19800.89590.9231

Note: “√” represents the right recognition result and “×” represents the wrong one.