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Comprehensive Guide to KC-135R APU Sound Recording and Analysis Techniques

This tutorial provides an in-depth overview of sound recording and analysis for the KC-135R Auxiliary Power Unit (APU). It covers the dual APU system located in the open aft cabin area, focusing on significant sound levels in the cockpit. Key methods include using a calibrated SPL microphone for digital recording, essential for FAA Level D certification. Users will learn to utilize sound analysis tools like Adobe Audition for detailed frequency domain editing. The guide also discusses modeling sound components associated with motor start, turbine operation, and bleed air valves for high-fidelity simulations.

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Comprehensive Guide to KC-135R APU Sound Recording and Analysis Techniques

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Presentation Transcript

  1. APU Sound Model Tutorial

  2. Overview • KC-135R APU • Sound Recording/Analysis • V+ Modeling

  3. KC-135R APU • KC-135R Has Two APU’s • Units are Located in Open Aft Cabin Area • Sound Level is Significant in Cockpit

  4. Notes on Recording • Need Calibrated SPL Microphone • Record at Source for Model Details • Record in Cockpit for FAA Level D Certification • Record Digitally • (24 Bit) Mono • Associate with Instrumentation if Possible

  5. Sound Analysis Tools • Adobe Audition • Adobe Systems Incorporated • Edit in Frequency Domain

  6. Sound Spectrograph Time Freq Brighter Colors Are Greater Amplitudes

  7. APU Sound Components • Intake/Exhaust Door Open/Close • Start Motor • Turbine and Noise Spectra • Bleed Air Valve Open

  8. APU Sound Components Start Motor Turbine Bleed Air Valve Open Door Open

  9. Enlarged Start Section Start Motor Turbine Spool Door Open

  10. Starter Motor

  11. Turbine Turbine Discrete Blade Passing Frequency (DBPF – NTSB term)

  12. Turbine Removed Removed Turbine DBPF

  13. Model Inputs • Intake/Exhaust Door Open/Close, Start Motor, Bleed Air Valve • Discrete Events • Turbine • Model Based on RPM From Host

  14. V+ APU Model

  15. Summary • Very high fidelity model • V+ and FXDirect enabling technologies • That was just an APU • Modular design eases re-use

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