1. Management, systems integration and reporting 2011 Daniel, Matt, Tony, Sam, Mayur
Mission Task • Search and rescue UAV • Requirements
Allocations of Groups & Members • 1. Management • 2. Mayur - Payload & Electrical Power • 3. Matt - Aerodynamics • 4. Daniel - Structures • 5. Sam - Propulsions • 6. Tony - Weights and Balance • 7. Matt - Launch & Retrieval
Communications • Overall group meeting • Management meeting • Management attending sub group meetings
Resolving conflict • Good vs bad • Optimal design vs realistic
Payload and Electronics Payload Design
Payload - Contents • One man life raft • EPIRB • Flares • Heliograph • Food Supplies • 1.2L water • Heat Packs • Torch • Circuitry for lights
Payload - Dropping and Retrieval • The payload is dropped to land upwind of the person • This means the wind will push it back towards the person • A rope follows the payload with a drogue, landing near the person for retrieval • The person can then access everything that is stored in the payload, which is attached with velcro
Payload and Electronics Autopilot and Flight Control
Mission Computer Decides where to fly Is responsible for communications Searches for person (via FPGA) Flight Computer Controls the aircraft Gets info from sensors Continually monitors location/speed/attitude Autopilot System
Payload and Electronics Control and Comms
Control Requires +-20 degree deflection 4 bar linkage chosen, directly driven by servo Servo mounted inside wing, linkage mount attached directly to the surface of the flap. Battery Powered. Chosen for relatively light weight and small size compared to alternatives: hydraulic actuators, direct rotation For greater range of motion, or higher torque, gearing can be be implemented for relatively small weight gain.
For wing servo PS-105, high torque servo 35Nm, +-45 degree range of motion, requires 18 W each For tail servo, K-2000 servo, 10 Nm torque, +-45 degrees of motion, requires 9 W each For throttle, Futaba Brushless servo, 3Nm torque, low power requirements.
Radio Broadcast Direct Line of sight impossible at search height Typical video surveillance (Ku, C and S) bands affected by rain Broadcast in L Band to avoid effects of Rain fade Satellite phone for telemetry broadcast 1.5" square Iridium Antenna for receiving signal RF unit to receive radio signal close to ship for direct control in case of emergency
h =781m above search height of 200m L = 100km no change to range
Telemetry Sent During normal flight Status(Cruise, Search, Loiter, Return)Location (from Gps) SpeedAltitude Distance to search area During search As above plus wind speed For positive identification, photo location Sends 50 by 50 pixel relevant section of photo to minimise bandwidth Termination protocol Ship sends confirmation signal every 10 seconds, if UAV loses contact for 10 minutes vehicle will terminate. If ship is not receiving telemetry, ie. satellite link down, will send instruction to UAV to re-establish uplink every 10 seconds, if UAV continues to receive this signal for 10 minutes will terminate.
Group 4 Structures Leo Pasukov Thomas Slee Amanda Neal NabilChowdhury NayeemChowdhury
A representation of the complete wing and fuselage attachment system
Initial Fuselage Design to accommodate payload and air cannon launch with pusher propellers located under the wing facing the back of the vehicle
Determining the total deflection of the Motor Mount and equivalent Stress of Motor Mount
The ruddervators end before the apex of the inverted V, and provide the design with some aesthetics.