Notetaker: Structures Subsystem Flashcards
The frame that all other subsystems are attached to
Structures Subsystem
Identify
Utilizes specific shape, usually a box/cylinder
Common Structure Type
Open Truss
Identify
Frame/equipment directly attached to structural elements
Common Structure Type
Body Mounted
Identify
Open Truss and Body Mounted
Common Structure Type
Combination
What are the 4 structure load types?
- Tension
- Shear
- Compression
- Torsion
Identify
Pulling something apart
Structure Load Type
Tension
Identify
Opposing loads applied to perpendicular cross-sections
Structure Load Type
Shear
Identify
Pushing something together
Structure Load Type
Compression
Identify
Produced by twisting
Structure Load Type
Torsion
What are the 4 structure load causes?
- Acceleration
- Vibrations
- Pyrotechnic Shock
- Thermal Stress
Identify
Produced by propulsion
Structure Load Cause
Acceleration
Identify
Produced by propulsion and other operations in orbit
Structure Load Cause
Vibrations
Identify
Produced by explosive separation
Structure Load Cause
Pyrotechnic Shock
Identify
Produced by temperature variations
Structure Load Cause
Thermal Stresses
Identify
Load applied to a structure (per unit area)
Structure Load Effect
Stress
Higher load = higher stress
Greater area = lower stress
Identify
Stress causes a temporary change in shape or deformation in the structure
Structure Load Effect
Strain
Strain = amount of deformation per unit length
Identify
Can only be used a few times (e.g. Deployment of solar arrays, antennas, and/or booms)
Structure Mechanism
Low Cycle Mechanism
Identify
Used constantly thoughout vehicle life (e.g. Reaction wheels, gyroscopes, Solar Wing Drives)
Structure Mechanism
High Cycle Mechanism
Identify
- Internal heat generation
- Heat emitted from the spacecraft to deep space
- Heat absorbed by the spacecraft from external sources
Space Hazards for Structures
Thermal Radiation
Identify
- Cold Welding
- Outgassing
Space Hazards for Structures
Space Vacuum
Identify
Collision with natural debris (e.g. micrometeoroids, man-made debris, and intentional (hostile) projectiles)
Space Hazards for Structures
Micrometeroids and Debris
Identify
Energetic particles that pass-through spacecraft’s materials and deposit in electronic components or even cause failure
Space Hazards for Structures
Charged-Particle Radiation
Identify
- Metals oxidized
- Polymers react and significantly eroded
Space Hazards for Structures
Atomic Oxygen (AO)
