Readiness Review University of Alabama in Huntsville University - PowerPoint PPT Presentation

NASA SL Flight Readiness Review University of Alabama in Huntsville University of Alabama in Huntsville 3/5/2018 1 USLI PDR

LAUNCH VEHICLE University of Alabama in Huntsville 3/5/2018 2 USLI PDR

Vehicle Overview • Vehicle Dimensions • Payload – Diameter: 6” fairing/4” aft – Deployable Rover – Length: 106 inches – Autonomous – Wet Mass: 41.1 lbs. – Retractable solar panels – Center of Pressure: 66.79 – L12” x H3” x W4” – Center of Gravity: 52.04 – Weight: 7 lbs. University of Alabama in Huntsville 3/5/2018 3 USLI PDR

Vehicle CONOPS University of Alabama in Huntsville 3/5/2018 4 USLI PDR

Forw rward Overview • Consists of: – Nose cone – Fairing – Transition – Forward coupler • Purposes: – House and protect rover and deployment piston – Transition between main body tube and fairing University of Alabama in Huntsville 3/5/2018 5 USLI PDR

Nose Cone • 3D printed • 6 in. tall elliptical shape • 2 in. shoulder • Houses solenoid for retention • Aluminum bulkhead for flush contact with rover University of Alabama in Huntsville 3/5/2018 6 USLI PDR

Solenoid • Three solenoids with ½ in. aluminum rods • Will reliably retain the rover during flight • Retract upon receiving signal after landing • Makes nose cone ejection easier University of Alabama in Huntsville 3/5/2018 7 USLI PDR

Solenoid • Arduino Nano with XBee • 5V supply • Spring assisted release of 8 oz. load • Solenoids pull with 10-25 oz. University of Alabama in Huntsville 3/5/2018 8 USLI PDR

Fairing • Houses rover and piston • G12 fiberglass • 25.25 in. long • 6.17 in. outer diameter • 6.0 in. inner diameter • Secured to transition with ¼-20 bolts • Secured to nose cone with solenoid pins University of Alabama in Huntsville 3/5/2018 9 USLI PDR

Piston • 6 in. tall coupler section • 0.25 in. thick aluminum bulkhead • Used to push rover out of the fairing University of Alabama in Huntsville 3/5/2018 10 USLI PDR

Transition • 3D printed forward and aft pieces with sparse in-fill for weight reduction • 0.25 in. thick aluminum insert • Threaded inserts with ¼-20 bolts hold pieces together University of Alabama in Huntsville 3/5/2018 11 USLI PDR

Coupler • 9 in. long • Sits within aft transition piece • Secured by threaded rod in tension between bulkhead and transition insert • U-bolt attached to aft bulkhead for main parachute University of Alabama in Huntsville 3/5/2018 12 USLI PDR

CENTRAL SUBSYSTEM University of Alabama in Huntsville 3/5/2018 13 USLI PDR

Central Subsystem Overview • Central Subsystem responsibilities: – Primary coupler between airframes – Flight Avionics – Ejection System – Tracking and Ground Station – Recovery System University of Alabama in Huntsville USLI 3/5/2018 14 PDR

Coupler • Altimeter calculates altitude • Charges deploy recovery system • Carbon fiber protects avionics from RF interference • Aluminum bulkheads serve as protection from ejection charges • Redundant charges/circuits University of Alabama in Huntsville 3/5/2018 15 USLI PDR

Coupler • Change: Switches rotated 270deg • Interfaces with forward and aft sections via removable rivets and shear pins, respectively • Interfaces with recovery system via U-bolts University of Alabama in Huntsville 3/5/2018 16 USLI PDR

AFT SUBSYSTEM University of Alabama in Huntsville 3/5/2018 17 USLI PDR

Aft ft Overview • Components – Lower Recovery Bulkhead – Fin Can Assembly – Fins (x4) – Rail Buttons/Standoffs – Thrust plate – Motor case retention University of Alabama in Huntsville 3/5/2018 18 USLI PDR

Aft ft Body Tube • 42 in. section of G-12 Fiberglass tube – Cut to length with wet saw • Fin slots cut using wooden jig guided router • Fin Can retention holes drilled using 3-D printed template University of Alabama in Huntsville 3/5/2018 19 USLI PDR

Aft ft Recovery ry Bulkhead • 6061T-6 Aluminum – Machined in-house using CNC • Pocketed to reduce weight • U-Bolt for lower recovery • Secured to Aft Airframe using four 4-40 bolts • Dimension – 3.9 in. dia. University of Alabama in Huntsville 3/5/2018 20 USLI PDR

Fins • Trapezoidal Fin set (x4) • G-10 Fiberglass – Wet sawed in house • Change since CDR – L1420 Flight: 3.5 in. height – L1520 Flight 3.25 in. height University of Alabama in Huntsville 3/5/2018 21 USLI PDR

Fin Can • 3-D printed in-house – ABS plastic • Attached to aft using 24x 4-40 bolts • 4 bolts holding each each fin in place • Dimensions – 9.75 in. length, 3.9 in. outer dia., 2.9 in. inner dia. University of Alabama in Huntsville 3/5/2018 22 USLI PDR

Fin Can Change • Press fits in the bottom did not stay in plastic • 6 motor retention/thrust plate holes – 4 holes now 4-40 through holes, secured with nuts – 2 remaining holes tapped for larger screws University of Alabama in Huntsville 3/5/2018 23 USLI PDR

Thrust Ring • 6061T-6 Aluminum – Machined in-house • Take motor thrust load – Not transferred to ABS plastic • Dimensions – 4.016 in. outer dia. – 3.9 in. inner lip dia. – 0.125 in. lip University of Alabama in Huntsville 3/5/2018 24 USLI PDR

Motor Retention Ring • 3-D printed from ABS plastic in-house • Held to fin can using two 6-32 screws • Retains motor into Aft body tube • Dimensions – 4.016 in. outer dia. – 3.48 in. dia. Inner lip – 0.25 in. lip University of Alabama in Huntsville 3/5/2018 25 USLI PDR

Rail Buttons • Large Airfoiled 1515 Rail Buttons – Commercially Available • Attached to Aft Airframe • 3-D printed Standoffs – Accommodate for reduced aft airframe (4 in. dia.) University of Alabama in Huntsville 3/5/2018 26 USLI PDR

RECOVERY SYSTEM University of Alabama in Huntsville 3/5/2018 27 USLI PDR

Recovery ry System • • Drogue Parachute Deployment: Main Parachute Deployment: – – Deployment at apogee Deployment at 600 ft. above ground level – – Fruity Chute CFC-18 (Cd = 1.5) Fruity Chute 96” Iris Ultra (Cd = 2.2) – – Shock Cords: ½ in. Kevlar (50 ft.) Shock Cords: ½ inch Kevlar(50 ft.) – – Connected between aft bulkhead in lower Connected between fairing bulkhead and airframe and avionics bay housing. avionics bay housing. – – Descent speed under drogue: 100.18 ft./s Descent speed under main: 15.51 ft./s University of Alabama in Huntsville USLI 3/5/2018 28 PDR

Recovery ry System Tests • Full Scale Charge Testing • Full Scale Flights University of Alabama in Huntsville 3/5/2018 29 USLI PDR

Kinetic Energy • Required that each individual section will have a maximum kinetic energy of 75 ft-lbf • Terminal velocity under drogue: 100.18 ft./s • Terminal velocity under main: 15.51 ft./s • Upon landing the vehicle will be broken into three major components tethered together Vehicle Section Mass (lbm.) KE (ft-lbf) Fairing 18.06 67.46 Coupler 6.79 25.36 Aft 8.93 33.36 University of Alabama in Huntsville 3/5/2018 30 USLI PDR

Drift Analysis Universit y of CRW Drift Model • Alabama in – Assumes: Huntsvill • Apogee is directly above the launch rail e USLI V relative • The parachute does not open immediately PDR • The drift distance stops once a component lands • Horizontal acceleration is solely based on relative velocity • Drogue parachute is negligible once the main is fully deployed Wind Speed 0 5 10 15 20 (mph) mph mph mph mph mph RASaero Drift 0.023 544.3 1088.5 1625.8 2153.6 Distance (ft.) CRW Model Drift 0 543.2 1088.4 1624.9 2153.1 Distance (ft.) 3/5/2018 31 UAH SLI PDR

Drift Analysis Cont. • CRW Monte Carlo Analysis – Varies coefficient of drag and apogee – Cases run at constant 0, 5, 10, 15, and 20 mph winds Largest Drift at ~2738 ft. Largest Drift at ~685 ft. University of Alabama in Huntsville 3/5/2018 32 USLI PDR

Ground station • Ground station written in MATLAB – Receives GPS sentences – Writes raw data and parsed data to separate files – Sends signal to rocket to deploy payload – The rover will transmit all saved sensor data to the ground station – Ground station will save rover data for post processing University of Alabama in Huntsville 3/5/2018 33 USLI PDR

GPS Tracking • System • CRW uses a circuit for tracking and payload deployment – consists of an Xbee Pro S3B RF module, a Teensy MCU, and an Adafruit MTK339 GPS Chip • Xbee transmits GPS coordinates to a receiver connected to the ground station laptop. • Str Structure In Integration • 3D printed mount to secure tracker and its essentials within the transition section of the rocket. • Three axis security and battery retention to ensure components are kept in tact University of Alabama in Huntsville 3/5/2018 34 USLI PDR

Deployment Electronics • Payload Deployment Electronics Schematic – Arduino-like MCU – Xbee Pro S3B RF Module – Adafruit GPS Module – Hot Wire University of Alabama in Huntsville 3/5/2018 35 USLI PDR

Deployment Electronics • Operated remotely from ground station • Teensy MCU receives signal to power hot wire – Hot wire cuts fishing line holding piston spike in place – Releases spike and punctures CO2 cartridge to deploy rover University of Alabama in Huntsville 3/5/2018 36 USLI PDR