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It has three important parts Descent control system Material Selection Egg protection

Mechanical system. It has three important parts Descent control system Material Selection Egg protection. Intro to cansat. DESCENT CONTROL SYSTEM. DESCENT CONTROL. Intro to cansat. Most important part of CanSat

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It has three important parts Descent control system Material Selection Egg protection

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  1. Mechanical system • It has three important parts • Descent control system • Material Selection • Egg protection CanSat 2013 PDR: Team 1276 (Garuda)

  2. Intro to cansat DESCENT CONTROL SYSTEM CanSat 2013 PDR: Team 1276 (Garuda)

  3. DESCENT CONTROL Intro to cansat • Most important part of CanSat • Need: To bring the descent rate to a value such that components are not affected by final impact with ground • Devices : Drag or Lift Generating CanSat 2012 PFR: Team 7634 (Garuda)

  4. Descent Rate Calculations Intro to cansat Formula used for calculating the terminal velocity Where Vt= Terminal Velocity W= Payload Cd= Coefficient of Drag (1.5 for round and hemisphere) ρ =Density of Air (It varies from 600m to ground level) A= Equivalent area of Parachute or cluster of them ((π*d2)/4) CanSat 2013 PDR: Team 1276 (Garuda)

  5. DESCENT RATE CONTROL : Our Design Intro to cansat • Objective: To reach the descent rate of 20 +/- 1m/s • Procedure: • Determination of basic dimensions and attributes of parachute through preliminary calculations • Determination of material’s coefficient of drag.It can be determined through Ansys Fluent analysis. • Experimentation to determine actual descent rate • Problems encountered: • It is not possible to find heights to test the parachute • More the height, more is the drift; hard to relocate parachute • Difficult to find out terminal velocity CanSat 2012 PFR: Team 7634 (Garuda)

  6. Descent Control Strategy Trade & Selection : Our Method Intro to cansat • DRAG MECHANISM SELECTION CanSat 2013 PDR: Team 1276 (Garuda)

  7. Descent Control Strategy Trade & Selection : Our Method Intro to cansat • MATERIAL SELECTION CanSat 2013 PDR: Team 1276 (Garuda)

  8. Descent Control Strategy Trade & Selection : Our Method Intro to cansat • PARACHUTE SHAPE SELECTION FINAL DECISION: Round shape is selected be because it provides minimum descent rate CanSat 2013 PDR: Team 1276 (Garuda)

  9. Container Descent Control Strategy Trade & Selection Intro to cansat Color Selection • Parachutes are ordered from FruityChutes.com which provide varied color parachutes • Colored parachute is preferred because of its ease in detection Shock Force Survival & DCS Connection • Parachute is connected to envelope via strings that can take up shock of sufficient magnitude Pre Flight review testability • Plumb line with very low weight as compared to payload • Length of string to be very long • Calculate the descent rate by simple formula- Velocity = CanSat 2013 PDR: Team 1276 (Garuda)

  10. OTHER DRAG DEVICES Intro to cansat • UMBRELLA DESIGN • Compressed Air Transport (Lift Providing Mechanism) • Air is highly compressed(about 20atm) and flows through nozzles to provide upper thrust • Air need to be compressed at very high pressure • Container material not easily available and will lead to increase in weight • Experiments showed that air compressed at 6 atm in 4L container with 3 nozzles provided thrust for just 5-6 seconds CanSat 2012 PFR: Team 7634 (Garuda)

  11. Intro to cansat Material Selection CanSat 2013 PDR: Team 1276 (Garuda)

  12. Material selection for the payload Intro to cansat Material Selection Requirement: • It should be light in weight • Easily available in nearby market • Easy to manufacture • Material Properties • How to select the material • Using data base software like CES • Test its properties on FEM software CanSat 2012 PFR: Team 7634 (Garuda)

  13. Problem Statement Intro to cansat • Propose a descent control system for a payload of 800gms with these requirements: • It should have an initial size of 250X130mm containing all the components for descent control. • During flight, it can expand to any dimension. • At the ground, it should have a velocity of around 8-10m/s to ensure the safe landing of the payload. CanSat 2013 PDR: Team 1276 (Garuda)

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