Modal and Natural Frequency Sensitivity Analysis of Electrohydraulic Stewart Platform

Table 5

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

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)	19.6809	20.294	57.2292	79.4651	83.2042	40.1239
Modal vibration mode	1	−0.3536	0.0068	−0.1017	0.1476	−0.0553
	0.3554	1	0.0154	0.1572	0.083	−0.0372
	0.0105	0.0128	−1	0.0013	0.0241	0.033
	−0.0388	−0.1592	0.0097	1	0.5615	0.052
	0.1524	−0.0591	−0.0174	0.5604	−1	−0.0473
	−0.0387	−0.0114	−0.0163	0.0127	0.0331	−1