Research on Dynamic Stability Optimization of Rock Spreader considering Prevention of Geological Subsidence and Local Collapse in Reclamation Area

Table 6

Description of first six natural frequencies and vibration modes of receiving boom.

Order	Natural frequency/Hz	Total amplitude/mm	Mode shapes
1	1.68	0.67	The middle span is around the Z-axis and bending in the positive direction of the y-axis
2	3.37	0.72	The head of the boom is twisted around the x-axis
3	4.78	0.47	Bending occurs between two groups of hanging points of boom
4	6.59	0.69	The two groups of hanging points of the boom are twisted in the opposite direction around the x-axis
5	8.36	0.65	The midspan and the head of the boom twist in the opposite direction of the x-axis
6	8.93	0.65	The whole boom is bent around Z-axis in the XY plane