PROPAGATION OF HIGH INTENSITY SOUND WAVES

Abstract

Sound field characteristics were studied as a function of increasing intensity. It was determined that one effect outweighs others. This is the distortion generated within the siren which makes it impossible to generate pure tones above a certain intensity. At high intensity the waveform of the sound assumes a sawtooth shape producing periodic shock waves. Conversely, it is concluded that if the distortion is small at the mouth of the siren, additional distortion in the subsequent propagation will not be significant. Waveforms observed in the AFFDL facility are included in an appendix. Interaction of sound waves from different sirens will, in addition, give rise to intermodulation effects producing sum and difference frequencies. In general, the intensity in the region in which the radiation from different sirens can interact will be so much lower than the intensity in the throat of the siren horn that these effects will also be small compared with harmonic distortion generated in the sirens.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1967
Accession Number
AD0822785

Entities

People

  • Gale R. Hruska
  • Henry B. Karplus
  • Verner J. Raelson

Organizations

  • IIT Research Institute

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Signals
  • Acoustic Waves
  • Acoustics
  • Computational Science
  • Computer Programs
  • Differential Equations
  • Doppler Effect
  • Frequency
  • Frequency Bands
  • Shock Waves
  • Sound Waves
  • Standing Waves
  • Test And Evaluation
  • Thermal Conductivity
  • Wave Propagation
  • Waveforms

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Fluid Dynamics.
  • Wave Propagation and Nonlinear Chaotic Dynamics.