The Returning Rocket Friend or Foe? David Franklin & Philip - - PowerPoint PPT Presentation

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The Returning Rocket Friend or Foe? David Franklin & Philip - - PowerPoint PPT Presentation

The Returning Rocket Friend or Foe? David Franklin & Philip Massey 1 / 15 The Returning Rocket - David Franklin & Philip Massey Outline Introduction Motivation Safety Physics Controllers Strategy Descent


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SLIDE 1

The Returning Rocket

Friend or Foe? David Franklin & Philip Massey

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SLIDE 2

The Returning Rocket - David Franklin & Philip Massey

Outline

  • Introduction

○ Motivation ○ Safety ○ Physics

  • Controllers

○ Strategy ○ Descent ○ Balance

  • Conclusion

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SLIDE 3

The Returning Rocket - David Franklin & Philip Massey

Outline

  • Introduction

○ Motivation ○ Safety ○ Physics

  • Controllers

○ Strategy ○ Descent ○ Balance

  • Conclusion

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SLIDE 4

The Returning Rocket - David Franklin & Philip Massey

Introduction

How do we make space exploration less expensive? Possible answer:

  • Reusability of launch

vehicles

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"Atlas EELV Family" Public Domain, US Gov FFA

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SLIDE 5

The Returning Rocket - David Franklin & Philip Massey

Introduction - Problem

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http://youtu.be/0UjWqQPWmsY?t=40s

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SLIDE 6

The Returning Rocket - David Franklin & Philip Massey

Introduction - Safety

  • Descent

○ Must land with safe velocity

  • Balance

○ Maintain a safe rotation

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"Falcon rocket family" by Craigboy - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons

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SLIDE 7

The Returning Rocket - David Franklin & Philip Massey

Introduction - Physics

  • Descent

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SLIDE 8

The Returning Rocket - David Franklin & Philip Massey

Introduction - Physics

  • Descent

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SLIDE 9

The Returning Rocket - David Franklin & Philip Massey

Introduction - Physics

  • Descent

  • Balance

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SLIDE 10

The Returning Rocket - David Franklin & Philip Massey

Outline

  • Introduction

○ Motivation ○ Safety ○ Physics

  • Controllers

○ Strategy ○ Descent ○ Balance

  • Conclusion

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SLIDE 11

The Returning Rocket - David Franklin & Philip Massey

Controllers - Strategy

  • Use two time-based controllers

○ One controller for descent ○ One controller for balance ○ Either can be changed without need to reprove

  • ther controller.

○ Cannot take advantage of particular descent strategy.

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SLIDE 12

The Returning Rocket - David Franklin & Philip Massey

Controllers - Descent

  • Safety:

○ At height h = 0, ensure v < vsafe

  • Cased solution:

○ If speed greater than max: ■ ○ Else if speed less than max and can free fall: ■ ○ Else: ■

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SLIDE 13

The Returning Rocket - David Franklin & Philip Massey

Controllers - Balance

  • Safety:

○ Maintain a bound on rotation

  • Idea:

○ Non-deterministically assign

  • Simple Solution:

○ Set ○ Keep ○ Use

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SLIDE 14

The Returning Rocket - David Franklin & Philip Massey

Conclusion

  • Safety
  • Physics
  • Controllers

○ Strategy ○ Descent ○ Balance

  • Importance

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"SpaceX Landing Rendering" Jon Rosszlsa

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SLIDE 15

The Returning Rocket - David Franklin & Philip Massey

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Questions?