application of shape memory alloys in aerospace industries
TRANSCRIPT
Mohammad Tanhaei
Sahand University of
Technology (SUT)
Iran - Tabriz
VGC (Variable Geometry Chevron)
VAFN (Variable Area Fan Nozzles)
Actuators :
Telescopic wing system
Servo valve
Retractable landing gear
Reconfigurable Rotor Blade (RRB)
VAFN ( Variable Area Fan Nozzle )
Significant reduction in noise and improved fuel consumption
The nozzle : is the exhaust duct
of the engine. This is the engine
part which actually produces the thrust for the plane.
VAFN ( Variable Area Fan Nozzle )
Larger diameter at take off can reduce jet velocity reducing noise
Adjusting the diameter in cruise reduce fuel consumption
Boeing tested VAFN capable of 20% area change
SMA actuators were used to position 12 panels at the nozzle exit
Cruise
Thrust
Nozzle Design
SMA actuators designed to
expand the nozzle when
heated, are attached to half of
the panels.
A support is attached to a
nozzle
Panels is attached to a support
ring by a small piece of thin steel
Actuator base is attached to
support ring
Nozzle Design
A small resistive heater is bonded on the surface of each actuator
SMA
60%Ni 40%Ti
Transition Temp: -55 to 70
Recoverable strain : up to 2.5 %
1000s of actuator
cycles
VGC (Variable Geometry Chevron)
What is chevrons ?
that are used for noise reduction. Their principle of operation is that, as hot
air from the engine core mixes with cooler air blowing through the engine
fan, the shaped edges serve to smooth the mixing, which reduces noise
creating turbulence .
VGC (Variable Geometry Chevron)
VGC (Variable Geometry Chevron)
VGC (Variable Geometry Chevron)
Static and Flight engine test
6 flights over 5 days with 3 engine
configurations3 days of testing June 2006
Telescopic wing system
A BStructure
Outer wing
segment
Slot
Inner wing
segment
Telescopic wing system
Coiled SMA actuator
Flexible
tube
fluid
Outer wing segment
Thanks for your Attention
Sahand University of
Technology (SUT)
Iran - Tabriz
Jet engine (Turbo jet)