Degradation State Identification of Cracked Ultrasonic Motor by Means of Fault Feature Extraction Method

Table 3

The first 5 groups of test data’s PDD statistics in each degradation state.

Group number	PDD to normal state	PDD to slight degradation	PDD to severe degradation	PDD to failure state	Identification results	Judgement
1	0.0744	0.1573	0.3542	0.6758	Normal state	Right
2	0.0687	0.1128	0.4031	0.6743	Normal state	Right
3	0.0956	0.1254	0.3755	0.6392	Normal state	Right
4	0.0842	0.1363	0.3687	0.6654	Normal state	Right
5	0.0659	0.1124	0.3255	0.6171	Normal state	Right
41	0.1706	0.0990	0.2498	0.5751	Slight degradation	Right
42	0.1032	0.0776	0.2960	0.5255	Slight degradation	Right
43	0.1277	0.0619	0.2342	0.5506	Slight degradation	Right
44	0.1046	0.1155	0.2585	0.5699	Normal state	Wrong
45	0.1197	0.0463	0.2224	0.5861	Slight degradation	Right
81	0.3052	0.2650	0.1047	0.3786	Severe degradation	Right
82	0.3531	0.2497	0.0639	0.4257	Severe degradation	Right
83	0.3285	0.2651	0.0449	0.3880	Severe degradation	Right
84	0.3250	0.2661	0.0758	0.4068	Severe degradation	Right
85	0.3417	0.2873	0.0362	0.3649	Severe degradation	Right
121	0.6126	0.5602	0.3374	0.0632	Failure state	Right
122	0.5838	0.5263	0.3997	0.1069	Failure state	Right
123	0.6296	0.5654	0.3511	0.0962	Failure state	Right
124	0.5378	0.4982	0.3729	0.0512	Failure state	Right
125	0.5743	0.5148	0.3364	0.0837	Failure state	Right