Noise Certification Considerations for Helicopters Based on Laboratory Investigations

Abstract

This is the second part of a program concerning noise certification for V/STOL and helicopter aircraft. Aspects considered were: an engineering calculation procedure which validly and reliably reflects annoyance to helicopter operations; estimates of noise exposure levels which could be compatible with human activities in areas surrounding heliports; noise exposure modeling for helicopter noise; certification measurement approaches for helicopter noise certification. The basics of the program involved human response evaluations of conventional takeoff and landing (CTOL) aircraft noise, simulations of helicopter noise emphasizing 'slap' or pulsating noise effects, and recordings of a wide variety of helicopter operations.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1976
Accession Number
ADA032028

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acoustics
  • Aircraft Noise
  • Aircrafts
  • Airframes
  • Amplifiers
  • Band Spectra
  • Data Analysis
  • Engineering
  • Fixed Wing Aircraft
  • Frequency
  • Frequency Response
  • Measurement
  • Recording Systems
  • Repetition Rate
  • Short Takeoff Aircraft
  • Tape Recorders
  • Turbines

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Aerospace Engineering
  • Theoretical Analysis.