Fig. 1. 38 kW dish Stirling power generation system. (a) Physical image; (b) (c) mirror unit support adjustment structure

Fig. 2. Ideal posture and error posture of the mirror unit

Fig. 3. Schematic diagram of the introduction of error sphere

Fig. 4. Mirror unit eliminates the error of the axis vector after three rotational movements

Fig. 5. Influence of position errors in different marker points on the focal axis deviation angle. (a) T₁ marker point; (b) T₂ marker point; (c) T₃ marker point

Fig. 6. Mean value and variance of the focal axis deviation angle under position error of different marker points. (a) Mean value; (b) variance

Fig. 7. Proportion of different marker points with different error sizes that meet the calibration accuracy. (a) Errors of T₁, T₂, and T₃ are within the range of 1‒5 mm; (b) errors of T₁ and T₂ are within the range of 2.3‒2.6 mm; (c) errors of T₃ are within the range of 1.6‒1.9 mm

Fig. 8. Mean value and variance of the focal axis deviation angle for different marker points. (a) Mean values of T₁ and T₂; (b) variance of T₁ and T₂; (c) mean value of T₃; (d) variance of T₃

Fig. 9. Influence of different errors at the three marker points on the deflection angle of the focal axis

Fig. 10. Ratio of mean value and variance of the focal axis deviation angle under different position errors of three marker points to the alignment accuracy. (a) Mean value; (b) variance; (c) proportion of conformity adjustment accuracy

Fig. 11. Influence of different sizes of mirror units on the deflection angle of the focal axis

Fig. 12. Mean value, variance, and proportion of compliance of the deflection angle obtained from different sizes of mirror units. (a) Mean value; (b) variance; (c) proportion of compliance

Fig. 13. Spatial location map of the three marker points of the mirror unit simulated by the Matlab program. (a) Overall diagram; (b) detailed diagram

Fig. 14. Mean value and variance of deviation angle obtained from different initial poses of mirror units. (a) Mean value; (b) variance