Purdue University Project Chaffee Critical Design Review Launch - PowerPoint PPT Presentation

Purdue University Project Chaffee Critical Design Review

Launch Vehicle

Vehicle Dimensions Length: ● Diameter: 3” ● Wall Thickness: 0.057” ● Fin Thickness: 0.125” ● Weight (loaded): 22 lbs. ● Weight (unloaded): 20.5 lbs. ●

Vehicle Materials Filament-wound fiberglass: Airframe; coupler tubes ● G10 fiberglass: Fins; bulkheads; centering rings ● Kevlar: Shock cord ● Nylon: Parachutes ● Epoxy: Adhesive for fixed joints ● Stainless steel: Recovery hardware (eyebolts, quick links, etc.) ● 6061 Aluminum: Motor retainer ● ABS: Custom-printed parts (avionics sled, payload mounting, etc.) ●

Flight Simulation

Stability Analysis Center of Pressure: ● Center of Gravity: ● Static Stability Margin: ● Minimum Dynamic Stability: ● Launch Rail Clearance Velocity: ●

Motor Data Designation: Aerotech K828FJ ● Maximum Thrust: 1303.8 N ● Average Thrust: 862.9 N ● Burn Time: 2.5 s ● Total Impulse: 2157.2 Ns ● Thrust/Weight Ratio: 8.8 ●

Recovery - 2 redundant altimeters - Primary Altimeter - Featherweight Raven - Secondary Altimeter - Missile Works RRC3 - Drogue Parachute Deployment - Apogee - Main Parachute Deployment - 700 Feet

Recovery cont. - Main Parachute - 60” Sky Angle - Drogue Parachute - 24” Sky Angle - Shock Cord - 5/16” Tubular Nylon

Kinetic Energy and Drift Analysis

Payload Design Closed Loop PID controller that has multiple filters to help create accurate results

Control Theory Theta dot- roll rate V infinity- Velocity Phi- Fin Deflection (s+a/(s+b))- compensator TF- actuator transfer function 1/s-integration

Physical Mechanism

Physical Mechanism

Parts List

Payload Testing Hard Code Test ● Torque Testing ●

Computing and Sensors Arduino Pi ● processing ● Adafruit Flora 9-DOF ● Orientation, velocity, gyroscope ●

Safety Construction Safety ● Use appropriate PPE, and obey all university lab procedures ○ Failure Modes ● Addressed through verification plan (see next slide) ○ Many prevented through material selection ○ Launch checklists to ensure safety ●

Verification Plan Payload Verification ● During construction and before launch ○ Vehicle Verification ● During construction and before full-scale test flight ○ Pre-Flight Verification ● To take place before every flight ○

Launch Operations Launch checklists to be used before all flights ● Hotel Procedures - Verify functionality ○ Prep Table Procedures - Secure all components ○ Pad Procedures - Arm all electronics ○ Launch Area Procedures - Assure personnel safety ○

Subscale Test Flight

Subscale 320 feet. ● Canted fins had noticeable but smooth effect. ● Landed safely ● Noticed bad “weathercock” ● Design change ○

Interfaces Navigation ● Eggfinder GPS transmitter/receiver ○ 900 MHz frequency range ○ Igniters ● Ensure proper installation before flight ○

Thank You!