Fig. 1. Structure diagram of two-axis turntable

Fig. 2. (a) Deformation cloud diagram of two-axis turntable; (b) Stress distribution cloud diagram of two-axis turntable

Fig. 3. (a) Curve of maximum deformation with temperature; (b) Curve of maximum stress with temperature

Fig. 4. Taking the position of the space vector

Fig. 5. Curve of shafting verticality error with temperature

Fig. 6. Curve of azimuth axis wobble error with temperature

Fig. 7. (a) Curve of pitch axis wobble error with temperature; (b) Comparison curve of wobble error between azimuth axis and pitch axis

Fig. 8. (a) The first-order mode, moving along the X-axis, the frequency is 77.531 Hz; (b) The second-order mode, moving along the Y-axis, the frequency is 89.633 Hz; (c) The third-order mode, moving along the Z-axis, the frequency is 132.29 Hz; (d) The fourth-order mode, rotating around the Z-axis, the frequency is 144.25 Hz; (e) The fifth-order mode, rotating around the Y-axis, the frequency is 218.69 Hz; (f) The sixth-order mode, rotating around the X-axis, the frequency is 237.92 Hz

Fig. 9. Curve of frequency change rate with temperature

Table 1. Z-direction deformation data of sample points of shaft system with 22 ℃