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Engineering Analysis: Introduction

Engineering Analysis: Introduction. Spring 2014. Innovative System Project for the Increased Recruitment of Emerging STEM Students. Outline. Engineering Analysis (Calculations) Videos Analysis Flow Charts Global Assumptions. Engineering Analysis Videos.

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Engineering Analysis: Introduction

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  1. Engineering Analysis: Introduction Spring 2014 Innovative System Project for the Increased Recruitment of Emerging STEM Students

  2. Outline • Engineering Analysis (Calculations) Videos • Analysis Flow Charts • Global Assumptions

  3. Engineering Analysis Videos • 8 videos about different physics aspects of your payload • Spacecraft (orbiter) orbital velocity • Muzzle Velocity • De-Orbit • Drag Force (full physics analysis) • Drag Approximations • Parachute Physics • Buoyance • Power and Batteries • Supporting material in Workbook and Downloads page • Watch (and re-watch) the videos that pertain to your payload • Ask Matt/P.J. and/or your UAH POC any questions

  4. Introduction: Analysis Flow charts

  5. Engineering Analysis Flow Charts • Purpose • To show the calculation process • Shows inputs and outputs • Shows intermediate steps • Basically, shows how you got from A to B to C … • Things to Include • Ground Rules and Assumptions (GR&A) • Inputs and outputs • Intermediate calculations • The overall flow process

  6. Calculation/Analysis Flow Charts Examples from college and professional world *Note: These are shown for ideas – InSPIRESS teams won’t do all these calculations!

  7. With Images This flow chart contains images instead of boxes. They look nice, and show the audience what you are solving for.

  8. More with Images/Icons Another flow chart with images instead of boxes. Here, you can easily the see inputs and outputs, and which variables are passed to the next (subsequent) calculations.

  9. Flow Charts The following two flow charts are BAD. They were made by Matt for his college class – Matt intended for them to be difficult to understand and confusing (not to mention ugly). IF your flow charts look anything like the flow charts on the next two slides, please do them again, or just get rid of them. REMEMBER – a bad flow chart is worst than no flow chart at all!

  10. Example With Blocks • Science Objective: • Orbit Element X • Surface Element Y • Atmospheric Element Z • Options: • Combined or Individual Atmos & Surface Entry • Entry capsule on Orbiter or Carrier Atmospheric Science MER Atmos Elem Dry Mass PMF Atmos Elem Wet Mass MER Entry Capsule Mass Entry Mass ? 1 2 Surface Science MER Surface Elem Dry Mass MER Entry Capsule Mass Entry Mass 2 1 MER Orbit Science MER Orbit Elem Dry Mass PMF Orbit Elem Wet Mass Carrier Elem Dry Mass PMF Carrier Elem Wet Mass MER = Mass Estimating Relationship PMF = Propelland Mass Fraction

  11. More with Blocks • Science Objective: • Orbit Element X • Surface Element Y • Atmospheric Element Z Outcome: --Mass --Power --Cost --Mission Decision Tree C3 Mission Decision Tree Element Masses LV Selection Total Arch Mass Mission Scenario LV Cost Scenario Additions Science Payload Mass Power Total Mission Cost Cost: --Orbit Elem --Surface Elem --Atmos Elem --Entry System --Carrier System PER Element Power Element(s) Mass Element(s) Power Number of Instruments Cost Model Element(s) Costs

  12. Calculation Flow Charts Examples from Inspiress *Note: These are examples from InSPIRESS, so these are representative for what you’ll be doing!

  13. Flow: Penetrator Impacting Enceladus Calculate structural and battery mass Calculate Orbital Velocity Calculate Impact velocity for desired penetration Evaluate Launch Angle for Maximum Velocity Evaluate Launch Barrel Length Calculate Launch Velocity Calculate Launch Pressure

  14. Flow: Probe Entering Saturn’s Atmosphere Calculate orbital velocity. Evaluate Saturn’s gravity as a function of altitude. Calculate structural and battery mass. Calculate maximum pressure probes can withstand. Calculate transmission time. Calculate deployment velocity of probes. Calculate time before entering atmosphere. Calculate time to descend through atmosphere. Calculate launch pressure Evaluate launch tube length.

  15. Instructions for Analysis Flow charts

  16. Analysis Flow Charts • Show Ground Rules and Assumptions (GR&A) • Show inputs and outputs • Where are you starting? • Where are you ending? • What are the input along the way? • Show major calculations (intermediate steps) • To get from the start to the end, where do you have to go? • Show the flow • Using images/icons is nice (if it’s not “too much”) • Must be easy to understand • Don’t need all the equations/answers

  17. The Flow Chart Blocks Ground Rules and Assumptions, Initial Conditions, etc Calculation Calculated Input (Previous Step) Calculated Output (for Next Step)

  18. InSPIRESS Spring 2014 Engineering Analysis Global assumptions

  19. Global Assumptions • Proper drag calculations are iterative, and usually require a computer to solve (Excel, Mathcad, Matlab, etc) • You are free to try the full (proper) drag calculations • Several teams have done this in InSPIRESS in the past • However, you can use drag approximations, if you want • The global assumptions for drag are on the next slide (and on the introduction video)

  20. Global Assumptions 230 km 175 km No Drag 100 km 65 km 50 km Drag Venus Surface

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