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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 - PowerPoint PPT Presentation
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SimPhonics, Inc.
APU Sound Model APU Sound Model TutorialTutorial
SimPhonics, Inc.
• KC-135R APU
• Sound Recording/Analysis
• V+ Modeling
OverviewOverview
SimPhonics, Inc.
KC-135R APUKC-135R APU
• KC-135R Has Two APU’s– Units are Located in Open Aft Cabin Area– Sound Level is Significant in Cockpit
• KC-135R Has Two APU’s– Units are Located in Open Aft Cabin Area– Sound Level is Significant in Cockpit
SimPhonics, Inc.
Notes on RecordingNotes 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
• 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
SimPhonics, Inc.
Sound Analysis ToolsSound Analysis Tools
• Adobe Audition– Adobe Systems Incorporated– Edit in Frequency Domain
• Adobe Audition– Adobe Systems Incorporated– Edit in Frequency Domain
SimPhonics, Inc.
Sound SpectrographSound SpectrographTime
FreqBrighter Colors Are Greater Amplitudes
SimPhonics, Inc.
APU Sound ComponentsAPU Sound Components
• Intake/Exhaust Door Open/Close
• Start Motor
• Turbine and Noise Spectra
• Bleed Air Valve Open
• Intake/Exhaust Door Open/Close
• Start Motor
• Turbine and Noise Spectra
• Bleed Air Valve Open
SimPhonics, Inc.
APU Sound ComponentsAPU Sound Components
Start Motor
Door Open
Turbine Bleed Air Valve Open
SimPhonics, Inc.
Enlarged Start SectionEnlarged Start SectionStart Motor
Door Open
Turbine Spool
SimPhonics, Inc.
Starter MotorStarter Motor
SimPhonics, Inc.
TurbineTurbine
Turbine Discrete Blade Passing Frequency(DBPF – NTSB term)
SimPhonics, Inc.
Turbine RemovedTurbine Removed
Removed Turbine DBPF
SimPhonics, Inc.
Model InputsModel Inputs
• Intake/Exhaust Door Open/Close, Start Motor, Bleed Air Valve
• Discrete Events
• Turbine• Model Based on RPM From Host
• Intake/Exhaust Door Open/Close, Start Motor, Bleed Air Valve
• Discrete Events
• Turbine• Model Based on RPM From Host
SimPhonics, Inc.
V+ APU ModelV+ APU Model
SimPhonics, Inc.
• Very high fidelity model
• V+ and FXDirect enabling technologies
• That was just an APU
• Modular design eases re-use
SummarySummary
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