Modal and Natural Frequency Sensitivity Analysis of Electrohydraulic Stewart Platform

Table 2

Modal frequencies and corresponding modal shapes of the Stewart platform in Case (a).

Vibration modes of each degree of freedom of upper platform	Moving along the X-axis	Moving along the Y-axis	Moving along the Z-axis	Rotate along the X-axis	Rotate along the Y-axis	Rotate along the Z-axis
Frequency (Hz)	20.4484	20.4484	58.4773	83.4761	83.4761	41.3497
Modal vibration mode	1	0	0	0	−0.1543	0
	0	1	0	−0.1543	0	0
	0	0	1	0	0	0
	0	−0.1538	0	−1	0	0
	0.1538	0	0	0	1	0
	0	0	0	0	0	−1