Sensor Placement Optimization of Vibration Test on Medium-Speed Mill

Table 2

Vibration frequencies.

Order	Frequency; /Hz	Vibration modal shape
1	1.828	direction horizontal vibration
2	2.003	direction horizontal vibration
3	3.578	Vertical vibration
4	4.078	Rotation around horizontal axis of the mill
5	4.235	Torsion around the vertical axis
6	4.422	Horizontal oblique translational vibration