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Chinese SONG progress and its design introduction. Guomin Wang gmwang@niaot.ac.cn 2011-9-16 Nanjing Institute of Astronomical Optics & Technology. SONG 4 th Workshop. College of Charleston. Outline:. Progress introduction Telescope design introduction. PROGRESS INTRODUCTION.
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Chinese SONG progress and its design introduction Guomin Wang gmwang@niaot.ac.cn 2011-9-16 Nanjing Institute of Astronomical Optics & Technology SONG 4th Workshop College of Charleston
Outline: • Progress introduction • Telescope design introduction
Now, we are… Structure constructing
Now, we are… Mirrors material test report from Russia LZOS Preparing mirror fabrication
Large bearing manufacturing Delivery time: 4 months Azimuth bearing φ680×φ880 × 80
Large bearing manufacturing Delivery time: 4 months Altitude bearing φ240×φ320 × 38
Preparing contract for long-term elements, such as . . . Encoders Torque motors
Cassegrain system; • M1: paraboloid, 1m clear aperture, Zeodur material, active support and close-loop controled through S-H; • M2: hyperboloid, fused silica material, active positioned by 5-DOF unit; • M3: flat mirror, Zeodur material, 180°turn to direct the light to different Nasmyth platform; • System ratio: F/36.7; General requirements
Image quality: 80% energy encircled in 0.3″ @ lucky imaging focus； • Nasmyth focus: VIS camera (450 - 650nm), RED camera (650 - 1000nm), Focus monitoring camera (< 450nm), auxiliary focus; • FOV @ Nasmyth: R32.52″； • Coudé focus: spectrograph (480 - 680nm); • FOV @ Coudé: 10″； • ADC: doublet prism; • Optical derotator: three - mirror General requirements
Range of azimuth: 0 º ～ ±220º; • Range of altitude: 10 º ～ 89º • Max. acceleration: 2 º/sec2 ; • Max. pointing speed: 20 º/sec; • Blind spot: 2 º (diameter); • Tracking accuracy: RMS 0.3″ , 90s, no guiding； • Pointing accuracy: RMS 5″, 70 º ≥ ZD ≥1 º; • Repeat pointing accuracy: ≤ RMS 1″, 70 º ≥ ZD ≥1 º; • First frequency: large than 8 Hz; General requirements
F/36.7 imaging quality after ADC Spot diagram of VIS @ ZD = 5 °
F/36.7 imaging quality after ADC Spot diagram of VIS @ ZD = 45 °
F/36.7 imaging quality after ADC Spot diagram of VIS @ ZD = 75 °
F/36.7 imaging quality after ADC Spot diagram of RED @ ZD = 5 °
F/36.7 imaging quality after ADC Spot diagram of RED @ ZD = 45 °
F/36.7 imaging quality after ADC Spot diagram of RED @ ZD = 75 °
Nasmyth optical design To Coudé From telescope
Coudé optical design From telescope
Constrained the 8 fixed anchor bolts; • Applied 3.5 t on the bearing place to simulate the above weight; • Apply 1g on the structure; • Apply 700N on the place of 1373mm from the bearing to simulate the wind force at 15 m/s; Basement Structure Max. stress: 49.92 Mpa Max. deformation: 0.022 mm
Table 2-1 Parameeters of iron pad Levelness adjustment
Azimuth motor • Friction torque:67.5N.m； • Inertial torque: 50N.m； • Wind torque: 139N.m； Swiss Etel Company: TMB0450-100; Rated torque: 561Nm; Rated current: 11.3A;
Constrain nodes connecting to bearing; • Add 1180N on top surface of center section to simulate the above weight; • Add 5390N on the down surface to simulate the down weight; • Add 1g to the structure; • Apply 400N at the place of 149.5mm above center section to simulate the wind force; Max. stress: 12.64 Mpa
M1 support • ￠1010mm, thickness 45mm, center hole 65mm, flat bottom; • Axial supporting: • Fixed supporting: 3; • Pneumatic active supporting: 33 (6+9+18); • Lateral supporting: 10 counterweight level; R1 = 151.72mm, F1 = 28.664N ; R2 = 296.5mm, F2=31.183N; R3 = 449.12mm, F3=36.775N;
Mirror cell calculation Max. deformation: 0.58 um Max. stress: 2.9 MPa
Electro- pneumatic regulator SMC Regulator
M1-M2 offset calculation Uz-altitute angle Uy-altitute angle Rotx-altitute angle
TCS configuration Master Computer (Advantech Industrial PC) Slave Computer(UMAC)
