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