multicopters - a practical view on unmanned aerial vehicles · multicopters a practical view on...
TRANSCRIPT
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Multicopters A practical View on
Unmanned Aerial Vehicles
Hamburg HAW, 05/06/2014
Jon Verbeke
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Overview
UAS/RPAS o Introduction UAS/RPAS o Civil Applications o Legislation o Systems & operational aspects
Multicopters o Introduction o Design o Control o Example o Live presentation
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UAS/RPAS
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UAS = RPAS
UAS = Unmanned Aerial System RPAS = Remotely Piloted Aircraft System
“A set of configurable elements consisting of a remotely-piloted aircraft, its associated remote pilot station(s), the required command and control links and any other system elements as may be required, at any point during flight operation”
UAV = Unmanned Aerial Vehicle RPA = Remotely Piloted Aircraft
GCS= Ground Control Station
RPS = Remote Pilot Station
Introduction UAS/RPAS
Command
& Control
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RPAS
Introduction UAS/RPAS
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RPAS vs. RC model aircraft
RC planes RPAS
What? Toy Perform useful task (payload) Purpose? Recreational Aerial work Where? Specific terrains “Everywhere”
Only after approval CAA Legislation? Existing model
aircraft legislation New legislation
Insurance Model aircraft club Operator
Parrot AR.Drone
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History
Started in the late 1800’s with unmanned gliders
First “successful” RPA’s during WW2 as aerial targets or missile
During Vietnam (1960’s) first used in reconnaissance role
Introduction UAS/RPAS
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History
From the 1980’s: more military applications
Drones = BAD
Introduction UAS/RPAS
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Why use RPAS?
Dangerous applications (close-up inspection)
Tedious applications ( area monitoring)
“Stealth” applications (surveillance)
Research (test platform, R&D,…)
RPAS generally cheaper than manned aircraft
Versatility
Introduction UAS/RPAS
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Cost comparison
RPAS overall cheaper o RPA is cheaper than manned version
(No systems needed for pilot: ECS, ejection seat,…) o RPS and ground handling is more expensive o Pilot training is cheaper
Difficult to precisely quantify the cost
o 1 manned aircraft = ? Unmanned aircraft? o Small or large RPA? Certification? Safety systems?
Introduction UAS/RPAS
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Configurations
RPA
Fixed-wing Rotary
Multirotor Conv. Conv Twin boom
Flying Wing
…
Other
Introduction UAS/RPAS
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Configurations/classifications
Bron: UVS int. RPAS yearbook 2013
91%
Introduction UAS/RPAS
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Civil applications
Civil applications
Your imagination is the limit…
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Applications
Inspection
Civil applications
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Applications
Surveillance
Civil applications
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Applications
Mapping (GIS = Geographic information system)
Civil applications
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Applications
Precision agriculture
Civil applications
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Applications
Delivery Services
Civil applications
“Beer-delivery drone
grounded by FAA”
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Applications
Media (Filming + photography)
Civil applications
Flying-cam Sarah 3.0
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Applications
Herding
Civil applications
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Applications
Search (and Rescue)
Civil applications
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Applications
Search (and Rescue)
Civil applications
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Applications
Search (and Rescue)
Civil applications
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Flying RPAS legally
1. Am I allowed to fly (Permit)? Aviation Authorities (State < 150kg, EASA >150kg)
2. Where may I fly? Airspace, airports CTR, military areas,…
3. What operational measures should I take? Location, Mission, Command & Control,…
4. Privacy? Photo and video capturing
Legislation
Safety!!
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Permit
Aircraft airworthiness and registration Pilot license Operator permit (operational manual, maintenance log,..) Insurance
Launch and recovery location owner’s permission Local authority permission
Depends on (national) legislation!
o http://uvs-international.org/ (European society) o http://www.uavdach.org/ (German society)
Legislation
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German society
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Where?
Airspace: o A,B,C,D,G? o P,R,D regions o Cities?
Airports CTR Low level operations
o Military low flying areas (LFA, down to 75m) o Helicopter training area (HTA, GND up to 75m)
VLOS, BLOS o Visual Line of sight o Beyond line of sight
Legislation
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Operational measures
Launch and recovery area o Obstacles o Safety region
Mission o Close-up inspection industrial site vs. monitoring fields
Line of sight, Command and Control o Control and telemetry data protection, frequencies
Right of way o RPAS at the bottom
Meteo o Required minima depend on RPA and mission
Legislation
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Privacy
No separate RPAS-privacy laws. Normal laws apply.
It is forbidden to take images AND distribute them IF people can be identified WITHOUT permission UNLESS there is a justified reason
Legislation
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System overview
Systems and operational aspects
System
Propulsion Flight control
Payload
Sensors C&C
Power Telemetry
Accessories
RX & TX C&C
(Autopilot) Telemetry
Servos Safety
C&C (ESCs or servos)
Batteries/Fuel Motors/Engines
Safety
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Take-off
Systems and operational aspects
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Recovery
Systems and operational aspects
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Transport
Systems and operational aspects
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Handling
Systems and operational aspects
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Maintenance
Parts, structure, systems, when, how…?
Systems and operational aspects
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Multicopters
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Multicopter
Special type of helicopter
Has three or more rotors/propellers
Often rotors are fixed-pitch propellers
Control of multicopter is by varying speed of each propeller
Very robust, simple and cheap
Name multirotor = multicopter
Introduction
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Types
There is no upper limit to the number of propellers: 4 propellers = quadcopter, 6 propellers = hexacopter, 8 = octo, 10 = deca,…
Introduction
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Types
E-volo VC200 First (unmanned) flight 2013 Manned flight testing 2014
Introduction
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Configurations
New configurations are still being conceived!!
Dire
ctio
n of
flig
ht
1) Quad + 2) Quad X 3) Hexa + 4) Hexa H 5) Tri 6) Hexa Y
7) Octo Conventional 8) Octo V shape 9) Octo Coax X 10) Octo Coax +
1 2 3
4 5 6
7 8
9 10
Introduction
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Special versions
Tilt rotor/ tilt wing
With wing
…
Introduction
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Special versions
PhD Research: o Design & Control of an
autonomous rotary RPA for inspection of orchards
o Harvest yield estimation
Introduction
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Components
Design
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Components
Design
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Components
Design
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Components
Design
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Multicopter control
For example: quadcopter
T= Thrust = propeller speed Q = Torque
T4
T3
T2
T1
1
2
3
4
Q4
Q3
Q1
Q2
x
y
Control
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Autopilot
Multicopters are inherently unstable autopilot!
Autopilot = computer that stabilises and controls the multicopter
Use info from sensors to evaluate the current state of the multicopter and command the motors to achieve a desired state
Both open-source and corporate autopilots exist
Control
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Autopilot examples
OpenPilot Paparazzi Mikrokopter Kkmulticopter Multiwii Aeroquad Arducopter Pixhawk
Micropilot
Control
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APM 2.6
ArduPilotMega 2.6 open source autopilot o Mission planner software on laptop
for inflight real-time status o Suitable for fixed-wing and rotary RPA o Includes:
• 6DoF Inertial Measurement Unit • 3-axis magnetometer • Barometric pressure sensor
o Combines with 3DR telemetry link and GPS o Size: 7x4x1cm, Total weight: 72g
Control
New: PixHawk
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PID controller (1)
Proportional-Integral-Derivative controller
Controller looks at the error between the actual input and the desired input and translates this error into a correcting output
Consists of three parameters that do the “translation” o Proportional parameter o Integral parameter o Derivative parameter
Control
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Autopilot control levels
Control
Mission
Navigation/Control
Stabilisation
Motor commands
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Onboard sensors
Inertial Measurement Unit (IMU) o 6DoF accelerations : 𝑥 , 𝑦 , 𝑧 , 𝜑 , 𝜃 , 𝜓 o Integrated over time to give
velocity and position o Large drift over time
Global Positioning System (GPS)
o Absolute position o Used as a correction for IMU drift
Control
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Onboard sensors
Magnetometer o Magnetic heading
Barometric pressure sensor
o Altitude o Climb speed
Ultrasonic altitude sensor (optional)
o Height above the ground
Control
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Optional onboard sensors
Optical flow sensor o Films the ground and detects
horizontal movement o Takes pitch, roll and altitude
into account
Navigational (Ultrasonic) sensors
o Detect walls, ceiling and floor o Prevents collision (indoor)
Control
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Optional onboard sensors
Laser scanner o Scans environment o Builds its own map
for navigation
Control
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Optional onboard sensors
Forward camera o Image processing o Pilot FPV or automatic
navigation (object recognition)
Control
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Indoor off-board sensors
Vicon motion capture system o Room full of cameras (20x MX T40 cameras) o Determine 6D pose of (multiple) vehicle(s): x, y, z,, and o Very accurate (millimetres) and fast (up to 2000Hz)
Control
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Optional onboard additions
Camera gimbal o Mounts camera o 1D, 2D or 3D o Compensated for roll, pitch
and yaw vehicle o From pocket camera up to cinematic
cameras
Navigational LEDs o Red, white and green o Marginal power
consumption
Control
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Research @ KU Leuven
PMA – Mechatronics and Robotics, Prof. Joris De Schutter
ESAT – TELEMIC, Telecommunications and Microwaves, Prof. Sofie Pollin
ESAT – PSI, Processing Speech and Images, Prof. Tinne Tuytelaars
Thomas More – EAVISE, Embedded Artificially intelligent Vision Engineering, Prof. Toon Goedemé
BIOSYST – M3-BIORES, Measure, Model & Manage Bioresponses, Prof. Eddie Schrevens
Kulab – Propolis, Processing Polymers & Lightweight Structures, Prof. Frederik Desplentere
Examples
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Multicopter example: ATX8
http://www.aerialtronics.com/ Endurance: 8 – 20min Range: 600m – 2km Payload : 2.75kg Wind: up to 12m/s (40km/h) Very modular design Cameras:
o Digital Single Lens Reflex-camera (DSLR) o FS700 o RED
Examples
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Multicopter example: ATX8
Examples
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Multicopter example: ATX8
Examples
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Multicopter example: ATX8
Examples
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Multicopter example: ATX8
Examples
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Multicopter example: ATX8
Examples
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Multicopter example: ATX8
Examples
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Multicopter example: ATX8
Examples
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Multicopter example: ATX8
Their new Altura Zenith ATX8
Monocoque structure!
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Flight Demo
AR.Drone Parrot 2.0 o Dimensions: 52x52cm o Weight: 400g o Battery: 3S1500 LiPo o Endurance <12min o Embedded computer/autopilot o Ultrasound altimeter 6m range o Forward camera (1280x720pix, 30fps) o Downward camera (320x240pix, 60fps)
o Safe to fly outside flight lab o Watch out for Wifi hotspots!
Live presentation