Health Diagnosis of Roadheader Based on Reference Manifold Learning and Improved K-Means

Table 1

Corresponding relation of vibration sensor.

Measuring point	Measuring point position	Sensor direction	Sensor	Coordinate
1	Lifting cylinder support point	Perpendicular to the cutting arm (X)	1	Establishing the coordinate system according to the roadheader: X: perpendicular to the side of the cutting part; Y: horizontal to the heading direction of the roadheader; Z: perpendicular to the upper plane of the roadheader
		Horizontal to the cutting arm (Y)	2
2	Cutting gearbox	Perpendicular to the cutting arm (X)	3
		Horizontal to the cutting arm (Y)	4
3	Hinge point between cutting part and turntable	Perpendicular to the cutting arm (X)	5
		Horizontal to the cutting arm (Y)	6
4	Fixed points of lifting cylinder and turntable	Perpendicular to the cutting arm (X)	7
		Horizontal to the cutting arm (Y)	8
5	Turntable center	Horizontal roadheader direction (Y)	9
		Vertical roadheader upper plane (Z)	10