Model 301 HLH/ATC (Heavy Lift Helicopter/Advanced Technology Component) Transmission Noise Reduction Program

Abstract

The report presents the results of a transmission noise reduction program. The emphasis of the program is to reduce transmission noise at its source. The program included a dynamic test of a CH-47C helicopter transmission with internal instrumentation to measure strains, displacements, and accelerations of rotating components and external instrumentation to measure case acceleration and noise levels. Test results were used to verify prediction methodology which in turn was used to analyze the dynamic response of the Heavy Lift Helicopter (HLH) transmission components. (Modified author abstract)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1974
Accession Number
AD0784132

Entities

People

  • R. Badgley
  • R. Hartman

Organizations

  • Boeing Rotorcraft Systems

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Acquisition
  • Aircrafts
  • Airframes
  • Army Aviation
  • Computer Programming
  • Computer Programs
  • Computers
  • Data Acquisition
  • Dynamic Response
  • Dynamic Tests
  • Frequency Bands
  • Geometry
  • New York
  • Resonant Frequency
  • Sound Pressure
  • Strain Gages
  • Test And Evaluation

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Aerospace Engineering