Flight Data Acquisition and Instrumentation Analysis of Stealth UAV.pdf

Unformatted text preview: Flight Data Acquisition and Instrumentation Analysis of Stealth UAV Presented by : Siddharth Roll no.: 150715 Guided by: Dr Subrahmanyam Saderla Content ❏ ❏ ❏ ❏ ❏ ❏ ❏ ❏ Objective AURA (Intro) Experimental setup Airspeed Sensor Servo Actuator ❏ Calibration Alpha - beta Vanes Data Acquisition while taxing Conclusion Objective The main objective of this experiment is to study the following properties of stealth UAV -AURA ❏ Data Acquisition ❏ Instrument Analysis of ❏ Airspeed sensor ❏ Servo Actuator (for control surface) ❏ Alpha - Beta Wind Vanes AURA taxing on the runway at IIT Kanpur Airstrip AURA(Autonomous Unmanned Research Aircraft) ● ● ● ● ● AURA is a stealth UAV Can supply battlefield intelligence Can disappear from radar Have autopilot feature Consist of 6 control surface, 2 each for Aileron,elevator,Spoiler General characteristics ● ● ● ● ● ● ● ● Wingspan of 2.74 m Root chord of 1.763 m (based on exposed wing planform) Tip chord of 0.421 m (based on exposed wing planform) Mean aerodynamic chord of 1.229 m Location of aerodynamic center from nose of aircraft 1.162 m Exposed wing planform area of 2.5116 m^2. Model weight 13 kg Fuselage length of 2.237 m Experimental Setup Alpha - Beta Vanes Inclinometer Beta Vane Alpha Vane 3D Fabricated model Air Duct Nose wheel Pitot Tube Airspeed Sensor Airspeed Sensor ● ● ● ● Use to measure Airspeed It consist of pitot tube Concept of differential pressure To get the airspeed V = √(2*(pT − pS)/ρ ) ρ -density of the flow of air pS- static pressure pT- impact/total pressure. Servo Actuator ● ● ● ● Use in movement of Aileron , Elevator and spoiler Kind of transducer Converts power of rotary motion into linear motion. Output is in PPM (pulse function modulation) Control surface Actuator Calibration 1.Calibration of Port side(left) Elevator Instrument used for calibration Inclinometer By linear interpolation 1 degree = 39.8406 PPM Mean data : 1488ppm -11deg 2.Calibration of Port side(left) Aileron Mean data : Instrument used for calibration Inclinometer By linear interpolation 1 degree = 30.2114 PPM 1500 ppm -10deg Alpha - Beta Vanes Alpha - Beta Vanes Beta Vane Alpha Vane ● ● ● ● Use to measure AoA , Sideslip angle Rotate because of force exerted by airflow Doesn’t hold for high angles Working consist of potentiometer 3D Fabricated model Specification of wind vane Mass = 14.01 grams Volume = 13288.90 cubic millimeters Surface area = 11594.48 square millimeters Center of Mass:( millimeters ) X = 90.13 Y = 116.12 Z = 205.01 CoM Y axis X axis 360 deg endless precision rotary potentiometer Free rotation potentiometer Specification of potentiometer R12=5.08 kΩ At Mean position R13=2.627 kΩ R23=2.565 kΩ Signal output Input Calibration of Alpha - Beta Vane Mean Instrument used for calibration Clinometer app in mobile By linear interpolation 1 degree = 0.0177V 0 deg 3.03V Data Acquisition while taxing Path taken by Aura on runway Airspeed (m/s) V/S time (sec) Angle of attack V/S time (sec) SideSlip Angle V/S time (sec) Roll angle of Aura V/S time (sec) pitch angle of Aura V/S time (sec) Aileron data PPM V/S time (sec) yaw angle of Aura V/S time (sec) Elevator data PPM V/S time (sec) Conclusion ● ● ● Data collected (data acquisition) from these instruments are of viable use while flying an unmanned vehicle Various sensor are replacing pilot direct maneuver (mechanical to electronic) We need these bunch of data acquired to develop machine learning models from a dataset to make a UAV autopilot Thank you ...
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