chinese song progress and its design introduction guomin wang [email protected] nanjing...
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Chinese SONG progress and
its design introduction
Guomin WangGuomin [email protected] [email protected]
2011-9-162011-9-16 Nanjing Institute of Astronomical Optics & Nanjing Institute of Astronomical Optics &
TechnologyTechnology
SONG 4SONG 4thth Workshop Workshop College of CharlestonCollege of Charleston
Telescope schedule
Item Schedule Status
Preliminary Design
Review
Aug., 2010 Closed
Critical Design Review Dec., 2010 Closed
Factory Acceptance Nov., 2012 On going
Ready for Shipment Dec.,2012 . . .
On site Acceptance Apr., 2013 . . .
General requirements
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;
F/36.7 parameters
Item ParametersM1 ф1000Primary ratio F2.3System ratio F36.667Primary focus length 2300System focus length 36666.8 ( λ=546.1nm )FOV R32.52″M1-M2 distance 2100 mmM2–M3 distance 1600 mmM3–focus distance 1588.3 mmWorking wavelength VIS ( λ=450 ~ 650nm )
RED ( λ=650 ~ 1000nm )
Optical elements list
Item Size ( mm) Material CoatingAccuracy
Qty.
M1 φ1030x75 Zeodur AL λ/50 1
M2 φ96x25 Fused silica AL λ/60 1
M3 φ76X15 Zeodur AL λ/60 1
M4 φ30x5 Zeodur AL λ/60 3
M5 φ54x8 AL Zeodur λ/60 5
Wedge prism
φ40x6,∠5° H-LAK10/H-ZF1
450-1000nmantireflection λ/60 2
K mirror 1 60x44x10 Zeodur AL λ/60 2
K mirror 2 36x30x8 Zeodur AL λ/60 1
Dichroic mirror 1
φ30x3 Fused silica450-620nm (R)680-1000nm (T)
λ/30 1
Dichroic mirror 2
φ30x3 Fused silica450-620nmHalf-reflection λ/30 1
Item Size (mm)
Coating Material Accuracy Qty.
Field lens 1 φ20x4 Antireflective H-K9L N=1, ΔN=0.1
1
Field lens 2 φ20x5 Antireflective H-K9L N=1, ΔN=0.1
1
Achromatic lense1
φ20x7.5 Antireflective H-K9L/H-ZF2 N=1, ΔN=0.2
1
Achromatic lense2
φ20x7.2 Antireflective H-K9L/H-ZF2 N=1, ΔN=0.2
1
Achromatic lense3
φ38x7.5 Antireflective H-K9L/H-ZF2 N=1, ΔN=0.2
1
Achromatic lense4
φ22x7 Antireflective H-K9L/H-ZF2 N=1, ΔN=0.2
1
Achromatic lense5
φ24x9 Antireflective H-K9L/H-ZF2 N=1, ΔN=0.2
1
Achromatic lense6
φ22x7.2 Antireflective H-K9L/H-ZF2 N=1, ΔN=0.2
2
Protect mirror φ54x8 Antireflective Fused silica λ/10 3Dichroic prism 32x32x
32Antireflective Fused silica λ/10±10″ 1
Dichroic mirror 4 φ32x3 Half-reflective Fused silica λ/10 1Tilt mirror φ32x5 Al 480-680nm Zeodur λ/20 1Filter φ22x3 480-680nm Fused silica λ/10 3
Basem
en
t S
tru
ctu
re
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;
Max. stress: 49.92 Mpa
Max. deformation: 0.022 mm
Levelness adjustment
Rated load(N)
Max. load(N)
Unit torque(Nm/104N)
Adjustable height of adjusting bolt
(mm)
Adjustable height(mm)
Unit weight(kg)
20000 60000 2.5 0.25 5 7
Table 2-1 Parameeters of iron pad
Azimuth bearing
TypeCrossed roller bearing
d 680 mm
D 880 mm
H 80 mm
Axial runout < 0.02 mm
Radial runout < 0.02 mm
Axial sitffness 5000 N/m
Radial stiffness
10000 N/m
Tilt stiffness 450000 Nm/mrad
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;
Max. deformation: 0.042mm
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;
43
M1-M2 offset calculation
θ° uy ( um ) uz ( um ) Rotx(″)
0 0.00 11.71 0.00
10 1.52 11.57 0.14
20 2.79 11.15 0.27
30 3.80 10.44 0.39
40 4.56 9.44 0.50
50 5.10 8.13 0.58
60 5.46 6.51 0.65
70 5.68 4.59 0.70
80 5.79 2.41 0.73
90 5.83 0.00 0.74
Uz-altitute angle Uy-altitute angle Rotx-altitute angle
Fre
quency
ca
lcula
tion
Mode Frequency (Hz) Mode shape
1 24.8 Fork lateral
2 26.8 Fork fore-and-aft
3 46.4 Truss lateral
4 52.2 Truss fore-and-aft
5 54.5 Top ring torsion
6 73.7 Center section