Fig. 1. Solar heliostat structure composition

Fig. 2. Finite element model and local mesh of heliostat structure. (a) Finite element model of heliostat structure; (b) local mesh

Fig. 3. Variation of maximum deformation and slope error of heliostat with height angle when bolt support spacing d=900 mm. (a) Maximum deformation of planar mirror; (b) specular slope error component

Fig. 4. Variation of maximum deformation and slope error of heliostat under different bolt support spacing d and quantity N.(a) Maximum deformation of planar mirror; (b) mirror slope error component

Fig. 5. Distribution of deformation and total slope error of mirrors under different bolt support spacing d when N=11. (a)(d) d=750 mm; (b)(e) d=900 mm; (c)(f) d=1050 mm

Fig. 6. Results of optical accuracy of mirrors in service under different position parameters (H and L) of oblique support rods. (a) Maximum deformation of planar mirror; (b) mirror slope error component

Fig. 7. Results of optical accuracy of mirrors in service under different angle steel cross-section parameters (a and t). (a) Maximum deformation of planar mirror; (b) mirror slope error component

Fig. 8. Distribution of deformation and total slope error of mirrors under different angle steel cross-sectional parameters (a and t). (a)(c) a=50 mm, t=5.0 mm; (b)(d) a=30 mm, t=4.0 mm

Fig. 9. Results of optical accuracy of mirrors in service at different wind pressures and altitude angles. (a) Maximum deformation of planar mirror; (b) mirror slope error component

Fig. 10. Distribution of deformation and total slope error of mirrors under different wind pressures when height angle is 90°. (a)(c) Wind pressure is 0 Pa; (b)(d) wind pressure is 180 Pa

Fig. 11. Focused spot flux density distribution under different conditions (intensity of direct sunlight irradiation is 1000 W/m²). (a)-(c) Results of ideal mirror, self-weight only, and self-weight +180 Pa wind pressure at solar altitude and azimuth angles of 60° and 90°, respectively; (d) result of self-weight +180 Pa wind pressure at solar altitude and azimuth angles of 60° and 135°.