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Dynamics and Control: Spinning vs Linear Deployment Methods for Space Applications

Explore the advantages and disadvantages of Spinning and Linear deployment methods in preliminary design for space applications. Understand the impact on tether mass, tension, velocity, and rotational rates.

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Dynamics and Control: Spinning vs Linear Deployment Methods for Space Applications

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  1. Dynamics & Control Anne DeLion 6 February 2001 Preliminary Design

  2. Two types of deployment: Spinning Linear All calculations done for Hab, but code can easily be converted to work for ERV Tether Mass ~ 500kg Tether Mass < 1% of Hab mass, therefore it is considered negligible Tether Reel System ~ tether mass [Powell] Deployment

  3. Assumptions: Tether will deploy smoothly and uniformly All DV manoeuvres will be instantaneous Connected Hab/NTR modelled as a cylinder Spinning Deployment: Spin up connected Hab/NTR Release Hab & NTR to deploy the tether As the tether deploys, the rotation rate of the system will decrease After deployment, a second DV gives vehicles 2rpm spinrate Spinning Deployment

  4. Spinning Deployment • Advantages • Constant tension on tether during deployment • Easy to implement • Disadvantages • Requires greater DV • Possible attitude problems

  5. Spinning Deployment

  6. Linear Deployment • Deployment by initial linear velocity, spin up after tether deployment • Assumptions: • Tether will deploy smoothly off a reel • Initial velocity will be given by pyrotechnics, and will remain constant unless friction or braking is considered in the reel system • System c.m. will remain constant with respect to the orbit reference frame

  7. Linear Deployment Method: • After initial velocity, the tether will have to be decelerated. • Reel/Braking system • Friction included in reel

  8. Linear Deployment • Advantages • Lower DV needed for gravity spin-up • Disadvantages • How to keep constant tension? • What system to slow velocity of deployment?

  9. No Spin .5 rpm Spin-Up Initial Rotation Rate (rad/s) 0 0.0524 Initial Tension (N) 0 2365 Initial Velocity (m/s) Hab 0 .6021 NTR 0 1.5708 Rotation after Deploy (rad/s) 0 7.198e-4 Tension after Deploy (N) 0 3.75 Velocity after Deployment (m/s) Hab 0 .0695 NTR 0 .2051 Gravity Spin-up Rate (rad/s) .2094 .2094 Tension after Spin-up (N) 317470 31740 Velocity After Spin-up (m/s) Hab 20.2109 20.2109 NTR 59.6903 59.6903 Total Delta V for Spin-Up (m/s) Hab 20.2109 20.7436 NTR 59.6903 61.0559 Deployment - Comparison

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