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ACTIVE & PASSIVE CONTROL OF ACTIVE & PASSIVE CONTROL OF VIBRATION & NOISEVIBRATION & NOISE
University of MarylandVibration & Noise Control Lab.
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ACTIVE & PASSIVE CONTROL OF SMART ACTIVE & PASSIVE CONTROL OF SMART STRUCTURESSTRUCTURES
EXAMPLE 1: Active Control of Interior Noise of Cessna Citation Fuselage
Fuselage, Shaker & Control Patches Vibration & Acoustic Scanning
ACLDPatches
Shaker
Scanningarm
University of MarylandVibration & Noise Control Lab.
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ACTIVE & PASSIVE CONTROL OF SMART ACTIVE & PASSIVE CONTROL OF SMART STRUCTURESSTRUCTURES
EXAMPLE 1 (cont'd) : SOUND PRESSURE LEVEL INSIDE FUSELAGEWITH & WITHOUT CONTROLLER
University of MarylandVibration & Noise Control Lab.
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ACTIVE & PASSIVE CONTROL OF SMART ACTIVE & PASSIVE CONTROL OF SMART STRUCTURESSTRUCTURES
EXAMPLE 2: Vibration Isolation of A Gimbaled Camera System
Test Platform (ATI 496) Camera System with Vibration Isolation
University of MarylandVibration & Noise Control Lab.
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ACTIVE & PASSIVE CONTROL OF SMART ACTIVE & PASSIVE CONTROL OF SMART STRUCTURESSTRUCTURES
EXAMPLE 2 (cont'd): Vibration Isolation of A Gimbaled Camera System
CAD Drawing Hardware
Vibration Isolation Platform
University of MarylandVibration & Noise Control Lab.
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ACTIVE & PASSIVE CONTROL OF SMART ACTIVE & PASSIVE CONTROL OF SMART STRUCTURESSTRUCTURES
EXAMPLE 2 (cont'd): Vibration Isolation of A Gimbaled Camera System
Passive Control Passive & Active Control
University of MarylandVibration & Noise Control Lab.
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ACQUIRED EQUIPMENTACQUIRED EQUIPMENT
2. ULTRASPORT HELICOPTER
Engine Sound level meter
University of MarylandVibration & Noise Control Lab.
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Helicopter Cabin Vibration Contours of Door
ACTIVE CONTROL OF HELICOPTER ACTIVE CONTROL OF HELICOPTER INTERIOR NOISEINTERIOR NOISE
University of MarylandVibration & Noise Control Lab.
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MODE SHAPE OF HELICOPTER DOOR MODE SHAPE OF HELICOPTER DOOR (1st Mode (1st Mode -- 10.3Hz)10.3Hz)
Finite Element Experimental
University of MarylandVibration & Noise Control Lab.
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CABIN MODES OF VIBRATIONCABIN MODES OF VIBRATION(1ST MODE OF DOOR (1ST MODE OF DOOR -- 40 HZ)40 HZ)
University of MarylandVibration & Noise Control Lab.
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CABIN MODES OF VIBRATIONCABIN MODES OF VIBRATION(1st MODE OF BOTTOM (1st MODE OF BOTTOM -- 7.57 HZ)7.57 HZ)
University of MarylandVibration & Noise Control Lab.
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ACTIVE CONTROL OF GUN BARREL VIBRATIONACTIVE CONTROL OF GUN BARREL VIBRATION
OBJECTIVES
Enhance the firing accuracy of gun barrels using active controllers
Firing TestsDynamic Tests
University of MarylandVibration & Noise Control Lab.
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ACTIVE & REACTIVE SHELLSACTIVE & REACTIVE SHELLS
OBJECTIVES
Enhance the critical firing speed of gun barrels by modeling & experimentation of new classes of active & reactive designs
University of MarylandVibration & Noise Control Lab.
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Scanning Vibrometer
Balancing Weight
Test Shell
Motor
Water Tank
EXPERIMENTAL FACILITYEXPERIMENTAL FACILITY
Hydrophones
BalancingWeight
TestShell
HangingCables
Motor
WaterTank
Hydrophones
University of MarylandVibration & Noise Control Lab.
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FINITE ELEMENT MODELFINITE ELEMENT MODEL
Plain Ribbed
Water Tank
Test Shell
Element Type D.O.F No. of ElementAir 3-D Acoustic Fluid 1 5617Interface 3-D Acoustic Fluid 4 9160Water 3-D Acoustic Fluid 4 4036Cylinder Structural Shell 6 1364
Rib
University of MarylandVibration & Noise Control Lab.
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VIBRATION CONTROL OF SHELL IN WATERVIBRATION CONTROL OF SHELL IN WATER
0 1,000 2,000 3,000 4,000Frequency (Hz)
0.00E+00
5.00E-03
1.00E-02
Lo
ng
it
ud
in
al
Ac
ce
le
ra
ti
on
(g
)
0 1,000 2,000 3,000 4,000Frequency (Hz)
0.00E+00
5.00E-03
1.00E-02
Ra
di
al
Ac
ce
le
ra
ti
on
(g
)
Controlled
Uncontrolled
University of MarylandVibration & Noise Control Lab.
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Uncontrolled at 555 Hz Controlled at 535 Hz
LONGITUDINAL VIBRATION IN WATERLONGITUDINAL VIBRATION IN WATER
University of MarylandVibration & Noise Control Lab.