Intelligent Recognition Method of Turning Tool Wear State Based on Information Fusion Technology and BP Neural Network

Table 4

Energy analysis results of P2, P4, and P7 frequency bands of vibration signal (×10⁵).

Frequency band	Mean and range	Experimental factors
		Degrees of wear	Spindle speed	Feed rate	Cutting depth
P2	Mean 1	6.97	21.07	14.97	12.47
	Mean 2	11.97	13.63	15.46	18.54
	Mean 3	12.09	13.84	14.64	16.45
	Mean 4	31.93	14.43	17.9	15.51
	Range	24.96	7.44	3.26	6.07
P4	Mean 1	7.66	33.08	18.14	20.67
	Mean 2	13.38	22.83	15.84	28.32
	Mean 3	16.33	13.84	24.12	20.92
	Mean 4	49.54	17.16	28.82	17.00
	Range	41.88	19.24	12.98	11.32
P7	Mean 1	6.46	22.54	10.29	10.15
	Mean 2	10.28	11.91	8.42	19.37
	Mean 3	11.36	7.92	13.15	12.07
	Mean 4	25.05	10.77	21.29	11.55
	Range	18.59	14.62	12.87	9.22