ISO 23835:2022

INTERNATIONAL ISO
STANDARD 23835
First edition
2022-04
Space Systems — Mechanism design
and verification
Systèmes spacieux — Conception et vérification des mécanismes
Reference number
© ISO 2022
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Published in Switzerland
ii
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Fundamental requirements . 4
4.1 System performance . 4
4.2 Mission . 4
4.3 Function . 4
5 Design requirements .4
5.1 Interfaces . 4
5.2 Environmental design . 5
5.2.1 General . 5
5.2.2 Ground environment . 5
5.2.3 Launch vehicle flight environment . 5
5.2.4 Orbital environment. 5
5.3 Parts and materials . 5
5.3.1 General . 5
5.3.2 Requirements for parts . 6
5.3.3 Requirements for materials . 6
5.4 Mechanism design . 6
5.4.1 Accuracy control design . 6
5.4.2 Driving capability design . 7
5.4.3 Design life . 7
5.4.4 Tribology . 7
5.4.5 Major mechanical components . 8
5.4.6 Other requirements . 8
5.5 Structural design . 9
5.5.1 General requirements related to structural design . 9
5.5.2 Allowable mechanical properties of structural materials . 9
5.5.3 Margin of safety . 9
5.5.4 Stiffness design . 9
5.6 Thermal design . 9
5.7 Electrical design . 9
5.7.1 Electrical design . 9
5.7.2 Electrical wires . . 10
5.7.3 Electric connectors . 10
5.7.4 Insulation . 10
5.7.5 Grounding . 10
5.7.6 Deformation of wiring . 10
5.8 General requirements . 10
5.8.1 Safety . 10
5.8.2 Dependability . 10
5.8.3 Quality assurance . 11
5.8.4 Configuration . 11
5.8.5 Redundancy . 11
5.8.6 Operability . 11
5.8.7 Maintainability . 11
5.8.8 Interchangeability . 11
5.8.9 Fool-proof design . 11
5.8.10 Other requirements .12
6 Verification .12
iii
6.1 General .12
6.2 Verification by analysis . 12
6.2.1 General .12
6.2.2 Identification of worst-case conditions . .13
6.2.3 Thermal analysis . 13
6.2.4 Structural analysis .13
6.2.5 Function and performance analysis . 13
6.2.6 Analysis of torque/force margin . 14
6.2.7 Shock generation and susceptibility . 14
6.2.8 Generated disturbance . 14
6.2.9 Lubrication analysis . 14
6.2.10 Life analysis . 14
6.2.11 Magnetic or electromagnetic analysis . 14
6.2.12 Radiation analysis . 14
6.2.13 Electrical parts stress analysis . 14
6.3 Verification by test . 15
6.3.1 General .15
6.3.2 Development tests .15
6.3.3 Qualification tests . 15
6.3.4 Acceptance tests . 16
6.3.5 Life test . 17
Annex A (informative
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