Absorption of Low-Frequency Sound Energy by Vegetation: A Laboratory Investigation

Abstract

Many field research projects have been conducted to study the effects of natural foliage on the propagation and attenuation of sound. This research takes natural foliage into a controlled laboratory setting to test its low-frequency acoustic characteristics. Absorption of low-frequency components of unwanted noise is of interest to the Army, but has been an unsolved problem due in part to the cumbersome and expensive testing facilities needed to study long wavelengths. In this research, low-frequency absorption and reflection coefficients were found reliably and consistently. Due to study of the steady state conditions, the methods presented here could constitute a more consistent method than ever before. The procedures described in this paper can serve as a handbook for future research; recommendations are included.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2006
Accession Number
ADA445391

Entities

People

  • Ryan J. Lee

Organizations

  • Engineer Research and Development Center

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption Coefficients
  • Acoustic Properties
  • Acoustics
  • Army Corps Of Engineers
  • Barometric Pressure
  • Construction
  • Electrical Engineering
  • Engineering
  • Resonant Circuits
  • Resonant Frequency
  • Signal Generators
  • Signal Processing
  • Standing Wave Ratios
  • Standing Waves
  • Three Dimensional
  • Transmission Lines
  • Wave Propagation

Readers

  • Acoustics.
  • Computer Vision.
  • Spectroscopy.