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APU Sound Model Tutorial - PowerPoint PPT Presentation


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APU Sound Model Tutorial. Overview. KC-135R APU Sound Recording/Analysis V + Modeling. KC-135R APU. KC-135R Has Two APU’s Units are Located in Open Aft Cabin Area Sound Level is Significant in Cockpit. Notes on Recording. Need Calibrated SPL Microphone

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Presentation Transcript
overview
Overview
  • KC-135R APU
  • Sound Recording/Analysis
  • V+ Modeling
kc 135r apu
KC-135R APU
  • KC-135R Has Two APU’s
    • Units are Located in Open Aft Cabin Area
    • Sound Level is Significant in Cockpit
notes on recording
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
sound analysis tools
Sound Analysis Tools
  • Adobe Audition
    • Adobe Systems Incorporated
    • Edit in Frequency Domain
sound spectrograph
Sound Spectrograph

Time

Freq

Brighter Colors Are Greater Amplitudes

apu sound components
APU Sound Components
  • Intake/Exhaust Door Open/Close
  • Start Motor
  • Turbine and Noise Spectra
  • Bleed Air Valve Open
apu sound components1
APU Sound Components

Start Motor

Turbine

Bleed Air Valve Open

Door Open

enlarged start section
Enlarged Start Section

Start Motor

Turbine Spool

Door Open

turbine
Turbine

Turbine Discrete Blade Passing Frequency

(DBPF – NTSB term)

turbine removed
Turbine Removed

Removed Turbine DBPF

model inputs
Model Inputs
  • Intake/Exhaust Door Open/Close, Start Motor, Bleed Air Valve
      • Discrete Events
  • Turbine
      • Model Based on RPM From Host
summary
Summary
  • Very high fidelity model
  • V+ and FXDirect enabling technologies
  • That was just an APU
  • Modular design eases re-use