Baseline Noise Measurements of Army Helicopters. Volume 1. Program Study and Field Tests

Abstract

The report describes a study of the methods by which noise data of Army helicopters can be measured, stored, and analyzed in consistent and accurate manner to form a baseline noise data bank. A review is made of the characteristics of helicopter noise that create particular problems in measurement and recording, and current acquisition techniques are discussed in terms of these problems. A field test program is described, in which the noise of five Army helicopters was measured for hover and flyover modes of operation. Sample data, obtained by analysis of the noise records, are presented. As a result of the study, a draft acoustic measurement specification is presented which defines the requirements on helicopter noise data acquisition and analysis for Army data-bank storage.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1971
Accession Number
AD0887625

Entities

People

  • David F. Brown

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms
  • Sensors

DTIC Thesaurus Topics

  • Accuracy
  • Acoustic Measurement
  • Acoustic Signals
  • Aircrafts
  • Bandwidth
  • Data Acquisition
  • Data Analysis
  • Dynamic Range
  • Fixed Wing Aircraft
  • Frequency Bands
  • Magnetic Tape
  • Measurement
  • Recording Systems
  • Tape Recorders
  • Tape Recording
  • Test And Evaluation
  • Test Equipment

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Aerospace Engineering
  • Systems Analysis and Design