intermediate project presentation: hidden …€¦ · intermediate project presentation: hidden...
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INTERMEDIATE PROJECT PRESENTATION:
Hidden cracks/defects detection in aircrafts
Department of Civil EngineeringNorth Dakota State University
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Outline of the Project
1. Sensor deployment
2. Diagnostic signal generation
3. Signal processing
4. Experimental demonstration
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Sensor Deployment & Signal Generation
Sensor Deployment
Mechanical strain gages bonded to plate surfaces
Fiber optical gratings used as sensors
Diagnostic Signal Generation
Interrogation wave generation through PZT actuators Agilent 33220A wave
generator
Impact hammer
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Signal Processing
Signal processing
Clustering algorithmLocating impact positions on the composite plate and their impact forces
Determining the shapes and sizes of the damages
Beam-forming tech
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Finding Impact Locations Through Clustering
Hierarchy clustering K-means clustering
Tab. 1 Input data for clustering investigation
X 1 1 1 1 1 2 2 2 2 2 3 3 Y 1 2 3 4 5 1 2 3 4 5 1 2
Peak -28 7 11 -10 16 -13 -7 6 -32 -4 3 -2
3 3 3 4 4 4 4 4 5 5 5 5 5
3 4 5 1 2 3 4 5 1 2 3 4 5
1 0 -9 2 3 -6 5 -16 24 8 -18 -10 32
0 1 2 3 4 5 60
2
4
6
-30
-20
-10
0
10
20
30
0 1 2 3 4 5 60
2
4
6
-30
-20
-10
0
10
20
30
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Experimental Demonstration
Use flat composite plate specimens as aircraft fuselage
Implement proper boundary conditions
Cantilever or simply supported
Simulate impacts events using an impact hammer
Collect signals through oscilloscope and optical sensor interrogator
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Use Composite Plate as Aircraft Fuselage
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Use Impact Hammer as Excitation Devices
Impact Hammer
Used to simulate impact
Has sensor on the tip
Sends impact signals to ocsilliscope
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Signal Collection
Oscilloscope
Collect data from impact hammer
Dataq Instruments
Collect data from the mechanical strain gages
Optical Sensor Interrogator
Collect strain data from optical grating sensors
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Use Oscilloscope as Impact Signal Collection
Agilent 54621A
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Use Optical Sensor Interrogator as Strain Signal Collection
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Use DATAQ Board to Collect Mechanical Strain Gauge Signals
Dataq Intstuments for strain gage data collection.
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Simulated Impact Events Through Impact Hammer
• The data in the figure above shows an impact event in a one second time frame using 2000 data points.
• Typically the impact event is recorded in a span of 0.005 seconds or 10 data points. Typical impact force is 10 N-15 N.
Collected signals from oscilloscope
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Collected Mechanical Strain Gauge Date
• The data from the above figure shows the strain response from the six mechanical strain gages attached to the composite plate.
• The strain gage response is dependent on the gage’s location on the plate and the location of the impact.
Collected strain gauge data
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Modeling the anticipated system in virtual environments through software
Abaqus
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Thank you! Any questions?
Acknowledgement of the support from ND NASA Space Grant Consortium for this research