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The Mechanical Design of the Second The Mechanical Design of the Second and third Antarctic Survey Telescopeand third Antarctic Survey Telescope
Wen Haikun
http://www.niaot.ac.cn
Outline• 1. The Tube Design • 2. The Drive System Design• 3. The Low temperature test• 4.The AST3-3 Mechanical Design
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Sealing Structure
Temperature compensation Structure
Titanium alloy
The Tube Structure Design
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Bending angle
• Corrector mirror:2.84″
• Primary Mirror:2.12″
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Primary Mirror Supporting Structure
• 9 point whiffle tree structure
• Fixed position in the middle hole.
• Flexure supporting structure
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The stress and the deformation of the Mirror shape
• The max stress value :0.425Mpa
• The defromation of the mirror surface shape:
PV Value :43.7nm , RMS Value:7.2nm 。
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The focal plane System
• Switch the filter• Auto-focus system• Thermal dissipation
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Deformation of the drive system
Deformation in the east-west directionMax displacement:0.935e-04mm
Deformation in the north-south directionMax displacement:0.884-04mm
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Buffer and limit position structure
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Reducer improvement
• Increase the rigidity of the reducer
• The lowest frequency :14.8Hz
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The Low temperature Test
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Mo He winter test
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Picture in the Anatarctic
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The tube of the third telescope
• Move the CCD to the outside of the tube
• Solve the heat problem
• easy to install and maintain
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The drive system of the third telescope
• Adjust the gaps of the gear
• Increase the rigidity of the reducer
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Thankyou