MICRO AIR VEHICLES

1
MICRO AIR VEHICLES
2
WHAT ARE MAVS(?AVS)?

• Multi functional, militarily capable, small
  flight vehicles.
• size should be less than15cms.
• Reynolds's no lt 105.
• For a Primarily intended and developed for
  defence applications.

3
(No Transcript)
4
(No Transcript)
5
(No Transcript)
6
(No Transcript)
7
WHY MAVS? WHY NOT SOMETHING BIGGER?

• Keeps security personnel out of harms by
  providing situational awareness right down to
  platoon level.
• Direct connectivity
• Can be individually controlled
• Can be used for a wide range of new missions _
  (even unthought-of before?)

8
APPLICATIONS

• Reconnaissance
• Surveillance
• Defence applications
• Weather forecast
• Wildlife study photography
• Crowd control

• Targeting
• Border surveillance
• Traffic monitoring
• Tracking criminals illegal activities
• Biochemical sensing
• inspection of pipes

9
OVER THE HILL RECONNAISSANCE
10
MOTHER BIRD APPROACH
11
Tracking of chemicals
12
MAIN SUB SYSTEMS

1. FLIGHT CONTROL
2. PROPULSION SYSTEM
3. COMMUNICATION SYSTEM
4. GUIDANCENAVIGATION

13
MAV flight regime compared with existing flight
vehicles
14
FLIGHT CONTROLAERODYNAMICS

• Reynolds's no inertia force/viscous force
• Low Reynolds's no flights may have lift to drag
  ratio of 5 to 10.
• The best aspect ratios usually lie between 12
• Angle of attack should be 5-12 for good
  endurance.
• If angle of attack lt5, low aerodynamic efficiency
• Endurance?/power requirement
• For optimal endurance the mav should fly at7

15
ACTIVE OR PASSIVE CONTROL

• Use strategies using MEMS
• Create install tiny sensors
• miniature actuators
• Flow character controlled by sensor arrays
• Flexible membranes or micro flaps to affect the
  flow as required
• Micro motors piezoelectric devices magneto
  elastic ribbons

16
WING DESIGN AND FABRICATION

• Types of wings
• wing shapes
• Composite materials,
• Carbon fibres
• carbon fibre-balsawood sand witches are commonly
  used

17
(No Transcript)
18
Inflatable wing

• Distend (fill) with air or gas
• Application in UAV, military
• To stow the wings
• Can be launched from gun or aircraft

19
Advantages of aircrafts with inflatable wings

• Can be packed to 1/10 of original size
• Low mass
• Low power requirements
• High reusability
• It can be steered, accelerated, and decelerated
  in level flight.
• High stability and control
• High lift and slow landing speed

20
Experiment on inflatable wing

• Experiment conducted using I 2000
• It was launched from 800-1000 feet
• Inflatable wings comes out in 1\3 sec
• Successfully controlled the launch,flight and
  landing

21
Controlling of wing

• by using piezoelectric material

22

• actuator can be quartz and substrate can be
  aluminum or steel
• inflatable wings has smooth surface so low value
  of skin friction

23
I-2000 X-24A

• Both have inflatable wing
• I-2000 is UAV
• X-24A is manned

24
Disadvantages

• They are not self powered
• Cannot launch from ground
• There are chances of air bag buckling

25
PROPULSION SYSTEM

• Propulsion system alone consumes 90 of total
  power
• Lithium alkaline batteries
• IC engines
• Reciprocating chemical muscle
• Lithium battery that recharges using solar energy
  and fuel cells are also future prospects
• Self consuming systems

26
(No Transcript)
27
COMMUNICATION SYSTEM

• A video/still camera,
• various sensors,
• micro processors,
• Transducers
• an omni directional antennae

28
GUIDANCE AND NAVIGATION

• A combination of GPSinertial sensing is ideal
• Geographical information system to provide a map
  terrain for infrastructure would be great
• Pressure sensors

29
MAV SYSTEM INTEGRATION
30
(No Transcript)