Intelligent Diagnosis Method for Centrifugal Pump System Using Vibration Signal and Support Vector Machine

Table 6

The diagnostic results of various states with the defect degrees by the proposed method.

Test state	Defect degree	Simple diagnosis (first step)			Precision diagnosis (second step)				Judge state
		Normal ()		0.8558	0.0724	0.0718
Cavitation ()	Mild	0.3529	0.6038	0.0433	0.7382	0.0579	0.1763	0.0276
	Medium	0.2311	0.7621	0.0068	0.9218	0.0053	0.0204	0.0525
	Severe	0.3200	0.6134	0.0666	0.9649	0.0001	0.0098	0.0252
Impeller unbalance ()	Mild	0.2026	0.6813	0.1161	0.0153	0.7468	0.1934	0.0445
	Medium	0.1897	0.7385	0.0718	0.0118	0.8216	0.1430	0.0236
	Severe	0.1365	0.7027	0.1608	0.0092	0.7604	0.2259	0.0045
Shaft misalignment ()	Mild	0.3415	0.6435	0.0150	0.1138	0.2126	0.6072	0.0664
	Medium	0.2071	0.7446	0.0483	0.0158	0.1901	0.6831	0.1110
	Severe	0.3007	0.6756	0.0237	0.0576	0.1573	0.6315	0.1536