Overview
ISO 23835:2022 - Space Systems - Mechanism design and verification - defines uniform requirements for the design, material selection, fabrication, testing and inspection of spacecraft mechanisms and payload moving parts. The standard applies to mechanisms used throughout all mission phases (except engines and thermal protection systems) and supports safe, dependable operation by prescribing design practices and verification methods for space mechanism design and verification. Applicability to launch vehicle mechanisms is left to individual projects.
Key topics and technical requirements
ISO 23835:2022 organizes requirements across design and verification disciplines. Major technical topics include:
- Fundamental requirements: system performance, mission and functional allocation.
- Design requirements:
- Interfaces and integration constraints between mechanism and spacecraft.
- Environmental design addressing ground, launch vehicle flight, and orbital environments.
- Parts and materials: selection, characterization and allowable mechanical properties.
- Mechanism design features: accuracy control, driving capability (torque/force margin), design life, tribology (lubrication and wear), and major mechanical components.
- Structural, thermal and electrical design: stiffness, margins of safety, wiring, connectors and grounding.
- General engineering topics: safety, dependability, quality assurance, configuration control, redundancy, maintainability and fool-proof design.
- Verification:
- Verification by analysis (thermal, structural, life, lubrication, magnetic/electromagnetic, radiation, torque/force margin and worst‑case identification).
- Verification by test: development, qualification, acceptance and life testing (including recommended durations and practices).
- Informative annexes: guidance on driving capability design, life test duration factors and best practices for modeling & simulation.
Applications
ISO 23835:2022 is practical for:
- Designing and verifying solar array drive mechanisms, hinges, latches, rotating machinery and other moving payload mechanisms.
- Defining procurement and inspection criteria for mechanism suppliers and subcontractors.
- Developing verification plans: specifying required analyses, qualification and acceptance test programs and life testing.
- Managing risk areas such as tribology, thermal‑structural interactions and torque/force margins.
Who should use it
- Spacecraft mechanism designers and systems engineers
- Payload developers and integration teams
- Test laboratories and qualification engineers
- Quality assurance, reliability and safety managers
- Suppliers of flight mechanisms and materials
Related standards and context
ISO 23835:2022 was developed by ISO/TC 20/SC 14 (Aircraft and space vehicles - Space systems) and aligns with ISO/IEC directives for standards development. It complements other space system standards for avionics, structural and environmental testing used in spacecraft development.
Using ISO 23835:2022 helps teams standardize mechanism design and verification processes, reduce rework, and improve mission confidence for spacecraft moving mechanisms.