Notetaker: Structures Subsystem

Question 1

The frame that all other subsystems are attached to

Answer 1

Structures Subsystem

Question 2

Identify

Utilizes specific shape, usually a box/cylinder

Common Structure Type

Answer 2

Open Truss

Question 3

Identify

Frame/equipment directly attached to structural elements

Common Structure Type

Answer 3

Body Mounted

Question 4

Identify

Open Truss and Body Mounted

Common Structure Type

Answer 4

Combination

Question 5

What are the 4 structure load types?

Answer 5

• Tension
• Shear
• Compression
• Torsion

Question 6

Identify

Pulling something apart

Structure Load Type

Answer 6

Tension

Question 7

Identify

Opposing loads applied to perpendicular cross-sections

Structure Load Type

Answer 7

Shear

Question 8

Identify

Pushing something together

Structure Load Type

Answer 8

Compression

Question 9

Identify

Produced by twisting

Structure Load Type

Answer 9

Torsion

Question 10

What are the 4 structure load causes?

Answer 10

• Acceleration
• Vibrations
• Pyrotechnic Shock
• Thermal Stress

Question 11

Identify

Produced by propulsion

Structure Load Cause

Answer 11

Acceleration

Question 12

Identify

Produced by propulsion and other operations in orbit

Structure Load Cause

Answer 12

Vibrations

Question 13

Identify

Produced by explosive separation

Structure Load Cause

Answer 13

Pyrotechnic Shock

Question 14

Identify

Produced by temperature variations

Structure Load Cause

Answer 14

Thermal Stresses

Question 15

Identify

Load applied to a structure (per unit area)

Structure Load Effect

Answer 15

Stress

Higher load = higher stress
Greater area = lower stress

Question 16

Identify

Stress causes a temporary change in shape or deformation in the structure

Structure Load Effect

Answer 16

Strain

Strain = amount of deformation per unit length

Question 17

Identify

Can only be used a few times (e.g. Deployment of solar arrays, antennas, and/or booms)

Structure Mechanism

Answer 17

Low Cycle Mechanism

Question 18

Identify

Used constantly thoughout vehicle life (e.g. Reaction wheels, gyroscopes, Solar Wing Drives)

Structure Mechanism

Answer 18

High Cycle Mechanism

Question 19

Identify

• Internal heat generation
• Heat emitted from the spacecraft to deep space
• Heat absorbed by the spacecraft from external sources

Space Hazards for Structures

Answer 19

Thermal Radiation

Question 20

Identify

• Cold Welding
• Outgassing

Space Hazards for Structures

Answer 20

Space Vacuum

Question 21

Identify

Collision with natural debris (e.g. micrometeoroids, man-made debris, and intentional (hostile) projectiles)

Space Hazards for Structures

Answer 21

Micrometeroids and Debris

Question 22

Identify

Energetic particles that pass-through spacecraft’s materials and deposit in electronic components or even cause failure

Space Hazards for Structures

Answer 22

Charged-Particle Radiation

Question 23

Identify

• Metals oxidized
• Polymers react and significantly eroded

Space Hazards for Structures

Answer 23

Atomic Oxygen (AO)