Reliability Analysis with Multiple Dependent Features from a Vibration-Based Accelerated Degradation Test

Table 3

Feature evaluation results.

No.	Feature	Stress				Fitness	Mean ()	Rank
1	Mean	3.5 V	0.2491	0.5556	0.9500	0.5425	0.5102	8
		4.5 V	0.1616	0.3333	0.9839	0.3469
		6.0 V	0.7032	0.5556	0.9682	0.6411
2	Variance	3.5 V	0.6042	0.5556	0.8549	0.6001	0.5350	7
		4.5 V	0.4839	0.3333	0.7852	0.4237
		6.0 V	0.5634	0.5556	0.7892	0.5813
3	Crest factor	3.5 V	0.8614	0.5556	0.9808	0.6898	0.7509	3
		4.5 V	0.7359	1	0.9263	0.9134
		6.0 V	0.7430	0.5556	0.9319	0.6494
4	Kurtosis factor	3.5 V	0.3349	0.5556	0.9438	0.5282	0.4236	10
		4.5 V	0.3380	0.3333	0.7947	0.3809
		6.0 V	0.3179	0.3333	0.6620	0.3616
5	Waveform factor	3.5 V	0.5856	0.3333	0.9987	0.4756	0.6896	4
		4.5 V	0.7208	0.7778	0.9962	0.7825
		6.0 V	0.8182	0.7778	0.9858	0.8107
6	Clearance factor	3.5 V	0.8603	1	0.9436	0.9525	0.8961	1
		4.5 V	0.8570	1	0.9460	0.9517
		6.0 V	0.7649	0.7778	0.8804	0.7842
7	Frequency center	3.5 V	0.6258	0.5556	0.8631	0.6074	0.6260	5
		4.5 V	0.6474	0.5556	0.7387	0.6014
		6.0 V	0.8213	0.5556	0.8940	0.6691
8	Frequency variance	3.5 V	0.6124	0.5556	0.8679	0.6039	0.6194	6
		4.5 V	0.6907	0.5556	0.7590	0.6164
		6.0 V	0.7157	0.5556	0.8978	0.6378
9	HHT marginal energy (HME)	3.5 V	0.5675	0.5556	0.7430	0.5779	0.5057	9
		4.5 V	0.4637	0.5556	0.8415	0.5566
		6.0 V	0.3360	0.3333	0.8192	0.3827
10	HHT marginal energy spectrum entropy (HMESE)	3.5 V	0.7513	0.7778	0.9545	0.7875	0.8569	2
		4.5 V	0.8404	1	0.9643	0.9486
		6.0 V	0.9094	0.7778	0.9518	0.8347