Intelligent Diagnosis Model of Traction Seat of Urban Rail Vehicle Based on Harris Hawks Optimization

Table 3

Multiscale permutation entropy values of the three health states of the traction seat (only part is shown due to limited space).

State	Sample	MPE1	MPE2	MPE3	MPE4
Normal (0)	0	0.816852	0.868982	0.892605	0.918061
	1	0.708248	0.844968	0.781680	0.897962
	2	0.847388	0.886976	0.910367	0.911917
	3	0.860285	0.883452	0.914914	0.941772
	4	0.844852	0.896652	0.931031	0.929070
Small crack (1)	0	0.727376	0.729275	0.551191	0.707729
	1	0.792196	0.650526	0.565574	0.645749
	2	0.746012	0.640071	0.619615	0.567530
	3	0.756012	0.645144	0.623558	0.603248
	4	0.748917	0.647531	0.597829	0.618770
Big crack (2)	0	0.724450	0.825055	0.758960	0.770725
	1	0.703779	0.844347	0.742504	0.782242
	2	0.725932	0.841112	0.767185	0.767448
	3	0.706949	0.823326	0.750810	0.831523
	4	0.709567	0.840849	0.749813	0.794277