Modal and Natural Frequency Sensitivity Analysis of Electrohydraulic Stewart Platform

Table 4

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

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)	20.1335	20.7141	58.4720	81.2448	84.9425	40.9946
Modal vibration mode	1	0.5786	−0.0038	0.1159	−0.1447	−0.0592
	0.5792	−1	0.0091	−0.1617	−0.1058	−0.0288
	0.0021	−0.0116	−1	0.0003	−0.0016	0.0221
	−0.08	0.1642	−0.0007	−1	−0.6944	0.0313
	0.1466	0.0918	−0.0024	−0.6944	1	−0.0613
	−0.0437	−0.0031	−0.011	0.0046	−0.0359	−1