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Guomin Wang, Bozhong Gu, Xiangyan Yuan Zhiyong Zhang, Xiang Jiang, Shihai Yang

Introduction of SONG telescope design. Guomin Wang, Bozhong Gu, Xiangyan Yuan Zhiyong Zhang, Xiang Jiang, Shihai Yang The Third Workshop of SONG 2010-3-30 Beijing. Outline:. General requirements. Structure design introduction. Conclusions. SONG Optical layout.

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Guomin Wang, Bozhong Gu, Xiangyan Yuan Zhiyong Zhang, Xiang Jiang, Shihai Yang

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  1. Introduction of SONG telescope design Guomin Wang, Bozhong Gu, Xiangyan Yuan Zhiyong Zhang, Xiang Jiang, Shihai Yang The Third Workshop of SONG 2010-3-30 Beijing

  2. Outline: • General requirements. • Structure design introduction. • Conclusions.

  3. SONG Optical layout

  4. Primary mirror diameter: 1.0m; • Alt-az mount; • Two Nasmyth foci; • FOV at Nasmyth focus: 15′; • System focal ratio (Nasmyth focus): F/36.7 Design specifications

  5. M3 is used to direct light to two Nasmyth foci; • Distance of M3 above M1: 250mm; • Diameter of M3: 206mm; • M2 is supported using active positioning system; • Diameter of M2: 122mm; • Distance between M1 and M2: 2669.926mm; • Mount is compatible with the Coude system; Design specifications

  6. Azimuth rotation range: ±270°(TBD); • Slew speed: ＞20°/sec; • Acceleration/deceleration of rotation: ＞2°/s2; • Resolution of rotation: ＜ 0.01arcsec; Azimuth axis specifications

  7. Elevation rotation range: 5°to 89.5°in operation (TBD) 0°to 90°in maintenance • Slew speed: ＞20°/sec; • Acceleration/deceleration of rotation: ＞2°/s2; • Resolution of rotation: ＜ 0.01arcsec; • Blind spot: ＜ 1°; Elevation axis specifications

  8. Pointing accuracy: ≤ 5″over all sky, ZD＜70°,with pointing model; ≤ 0.5″over 1.5 degree; • Tracking accuracy(without AGU): ＜ 1″ RMS over 30min; ＜ 0.3″over 90 sec; • First resonance frequency: ＞10 Hz; Pointing and tracking specifications

  9. 2. Structure design 2460mm 4584mm 1880mm Baffle style is TBD

  10. Animate of telescope

  11. Elevation axis Gimbal structure Azimuth axis Fork Base Pier

  12. Azimuth axis structure 800×1080×120mm 345×450×110.5mm ERA 880C

  13. Basement FEM calculation • Max. deformation: 0.0764mm ; • Max. stress: 39.9Mpa;

  14. Fork structure • single part, easy to mount and alignment, and to ensure the position accuracy of elevation axis; • welded structure with steel plates; • thermal treatment to relieve stress;

  15. Fork FEM calculation • Max. deformation: 0.0123mm ; • Max. stress: 2.36Mpa;

  16. Tape encoder Bearing Bearing Elevation axis structure Driving motor

  17. OSS (Tube) structure • Serrurier truss; • Primary mirror supporting: vertical: 18-point whiffletree; lateral: counterweight lever;

  18. OSS FEM calculation

  19. M1-M2 relative offset calculation

  20. M2 supporting structure • 4 vanes connecting to top-ring; • Active positioning system: δx, δy, δz, θx, θy; • Baffle for stray light;

  21. M3 connecting part to center section M3 supporting structure bearing reducer motor and encoder • 4 vanes connecting to center section; • Motorized to achieve rotation for two Nasmyth foci;

  22. Modal calculation

  23. Control system

  24. It is just conceptual design. More detail calculation is needed, such as the motor torque, bearing stiffness, etc. and more innovative structure is needed to improve the performance further. • The preliminary structure design and calculation show that the telescope requirements can be met; Conclusions:

  25. Thank you !!!

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