wavelet analysis of cockpit voice recorder data
TRANSCRIPT
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Wavelet Analysis of
Cockpit Voice Recorder Data
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Project ResponsibilitiesTeam Leader
Digitize CVR Data, Develop Test Signals
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Project ResponsibilitiesCode Developer
Develop Wavelet source code
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Project ResponsibilitiesResearch
Research Wavelet Theory
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Overview
•Project Background
•CVR Basics & Recording
•Theory
•Wavelet Parameters
•Silent Track Analysis
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Project Background
1991 Beech 1900C Twin Turboprop Accident
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Accident Location
Project Background
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•Right engine mount failed
•Engine separated and struck empennage
•Aircraft broke apart in flight
•Recovered CVR with last 30 min of audio
Project Background
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Engine Mount Location
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Accident Animation
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Project Goals
• Digitize CVR recording
• Isolate tube failure location
• Develop Wavelet analysis program
• Perform Wavelet Analysis on CVR data
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Digitize CVR Data
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2146:29 INT-2 ah once your established inbound right you're good to what?
2146:34 INT-1 oh #.
2146:34 CAM ((sound of altitude alert chime))
2146:35 INT-2 stop one thing at a time. you're in a bad situation
so correct one thing first.
CVR Transcript and Tape
Catastrophic Event
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Goldwave Analysis
Goldwave is a digital audio editing program.
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Goldwave Analysis
Windowed Fourier Transform
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Goldwave Analysis
Windowed Fourier Results
These frequencies match those found by past research.
EventTurbines
Propeller Blade PassageCVR Noise
Frequency (Hz)5400 & 10300
105400
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Goldwave Analysis
Final portion of CVR recording
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Integral Transformation Theory
What is it?
Transforms a function from one space to anotherdepending on the transfer function.
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The Fourier Transform
Signal processing tool that takes asignal and tells us what frequencies are within that signal.
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The Wavelet Transform
Determines the frequency spectrum as a function of time.
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Morlet Wavelet Equations
Morlet Wavelet
Scaling/Translation Function
Wavelet Transform
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Triboelectric Effect
• Frictional motion creates static electricity
• Aircraft wires vibrate during flight
• Vibrations generate static electricity
• CVR records static electricity
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Develop Wavelet Computer Code
• Obtained existing Wavelet code from C. Torrence and G. Compo
• Created interface allowing use of Wavelet code
• Experimented with effect of input parameters
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Important Input Parameters
• Wo – Effects Wavelet width
• dj – Effects scale width
• mother – Type of Wavelet
Transform Parameters:
Scale Parameters:
• J1 – # of Scales
• So – Base Scale
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An Example
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Fourier Analysis
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Wavelet Analysis of Test Signal
Morlet Wavelet
Wo = 6dj = .25
Wo = 24
dj = .25
Wo = 24
dj = .025
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DOG Wavelet
Wavelet Analysis of Test Signal
m = 2dj = .025
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Wavelet Display Test
Wo = 6dj = .125
Morlet Wavelet
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• Scale Parameter Equations • Minimum Scale Size
• Maximum Wavenumber
• Beat Phenomenon
• Edge Effects and Tone Width
Wavelet Code Improvements
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Scale Parameter Equations
Base Scale Size
Number of Scales
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Minimum Scale Size
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Maximum Wavenumber5 Hz Test Tone
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Beat Phenomenon
50 Hz & 52 Hz Tones
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Wavelet Analysis
4p Propeller Mode
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Wavelet Analysis
Right Engine Turbine
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Future Work
• Continue verifying code consistency
• Obtain controlled triboelectric test data
• Investigate other crash explanations
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Acknowledgements
•Dr. Ronald Stearman
•Pete Moss – UT School of Music
•Chris Garland
•Javier Fuentealba
•Marcus Kruger
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Questions