Ontology-Based Noise Source Identification and Key Feature Selection: A Case Study on Tractor Cab

Table 4

Correlation coefficients.

Working condition near left ear (rotation speed: rpm)	Measuring point location											Working condition for vibration (rotation speed: rpm)
	1	2	3	4	5	6	7	8	Air filter	Muffler	Back panel
700	−0.035	0.067	−0.039	0.009	0.139	−0.001	0.021	−0.032	0.201	0.281	0.432	700
2400	−0.119	0.111	−0.038	0.062	0.023	−0.068	0.015	−0.062	0.283	0.311	0.511	2400