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 |  موضوع: رسالة دكتوراة بعنوان Aspects of Mechanical Design for an Infrared Robotic Telescope in Antarctica - Irait الأحد 11 أكتوبر 2020, 10:43 pm | |
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أخوانى فى الله
أحضرت لكم رسالة دكتوراة بعنوان
Aspects of Mechanical Design for an Infrared Robotic Telescope in Antarctica - Irait
Università Degli Studi Di Teramo
Dipartimento Di Scienze Della Comunicazione
Tesi Di Dottorato Di Ricerca in
Astrofisica Computazionale
Ciclo Xviii
Candidato:
Igor Di Varano
Tutors: Coordinatore:
Prof. Gino Tosti, Ch.mo Prof. Franco Eugeni
Prof. Oscar Straniero
و المحتوى كما يلي :
Contents
Acknowledgments 5
Introduction 6
Chapter 1 Characteristics of the Antarctic Site Dome C 8
1.1 General characteristics of Antarctic Plateau 8
1.1.1 Mario Zucchelli Station 9
1.1.2 Dome C Concordia Station 10
1.2 Antarctica as an astronomical site 11
1.2.1 Dome A 15
1.2.2 South Pole 15
1.3 Environmental conditions and astronomical site testing at Dome C 15
1.3.1 AASTINO 17
1.3.2 CONCORDIASTRO 17
CHAPTER 2 THE IRAIT PROJECT 20
2.1 Project overview 20
2.2 Scientific purposes 22
2.3 IRAIT operational modes 22
2.4 IRAIT Optical layout 24
2.5 Secondary and tertiary mirror drivers 26
2.6 Transportation and logistics at Dome C 29
CHAPTER 3 IRAIT MECHANICAL STRUCTURE 33
3.1 Main characteristics of an alt–az mount telescope 33
3.2 Drive rates and tracking limits 35
3.2.1 Field-rotation correction 35
3.2.2 Tracking limits of velocity in azimuth near zenith 37
3.2.3 Blind spot 38
3.3 Mechanical design criteria 40
3.4 Choice of materials 43
3.5 Telescope design 433
3.6 The optical tube 45
3.6.1 Serrurier truss design 45
3.6.1.1 Basic requirements 45
3.6.1.2 Nodes displacements: 2D and 3D comparison (static analysis) 46
3.6.1.3 Flexure diagrams 47
3.6.2 The supporting structure of the optical tube 52
3.6.3 Top ring 53
3.6.3.1 Estimation of vibration modes of the top ring 54
3.6.4 Optical tube analysis: second formulation 59
3.6.5 Comparison between analytic approach and numerical results 59
3.6.6 Spur gear sector for altitude motion 64
3.7 Fork structure 65
3.7.1 Fork arm of the first Nasmyth focus 67
3.7.2 Interface flange with AMICA 67
3.7.2.1 Flange analysis 67
3.7.2.2 Bolt selection 70
3.7.2.3 Structural analysis for fork arm at first Nasmyth focus 72
3.7.3 Fork arm on the second Nasmyth focus 75
3.7.3.1 Loads analysis 75
3.8 Base chassis 78
3.9 Shipping container 80
3.9.1 Heat transfer analysis 81
CHAPTER 4 MACHINE ELEMENTS DESIGN 84
4.1 Bearings choice criteria 84
4.1.1 Azimuth slewing bearing 84
4.1.2 Estimation of the forces acting on the azimuth bearing 86
4.1.3 Pinion design 89
4.1.3.1 Fatigue verification 89
4.1.3.2 Hertz verification 89
4.1.4 Verification of the duty cycle of azimuth bearing 90
4.1.5 Altitude taper roller bearings 90
4.2 Shaft dimensioning for azimuth transmission motion 91
4.2.1 Forces calculation 91
4.2.2 Stresses plot 93
4.2.3 Maximum stresses determination 94
4.2.4 Strain verification 96
4.3 Drive train 97
4.3.1 Selection of stepper motors 98
4.4 Joints 99
4.5 Welded joints 100
CHAPTER 5 SYSTEMATIC ERRORS 103
5.1 Astrometric errors 103
5.1.1 Annual aberration 103
5.1.2 Stellar Parallax 1044
5.1.3 Precession 104
5.1.4 Nutation 106
5.1.5 Polar motion 107
5.1.6 Proper stellar motion 107
5.1.7 Diurnal aberration 107
5.1.8 Atmospheric refraction 108
5.2 Mechanical errors 109
5.2.1 Azimuth axis misalignment 109
5.2.2 Collimation error 110
5.2.3 Driving rates 110
5.2.4 Field rotation corrections 110
5.2.5 Mount misalignments (intrinsic errors) 110
5.2.5.1 Misalignment of altitude axis due to fork arm flexure 110
5.2.6 Periodic gearing errors 112
5.2.7 Bearing errors 114
5.2.8 Tube flexure 116
5.2.9 Mount flexure 119
5.2.10 Tilt errors 119
5.2.10.1 Coordinate correction by data retrieved from inclinometers 120
CHAPTER 6 THERMAL ANALYSIS 123
6.1 Heat mass transfer analysis for electronic boxes 123
6.2 Optical tube box 124
6.3 Fork mount box 1 131
6.4 Container box 136
CHAPTER 7 THE AMICA RACK 140
7.1 Introduction 140
7.2 Upper cabinet 140
7.3 Lower cabinet 144
7.4 Mechanical interface with the telescope 144
CONCLUSIONS AND REMARKS 148
APPENDIX 149
A. FEM method analysis 149
B. Programs codes 155
C. Catalogues and products technical features 164
BIBLIOGRAPHY 17
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