A High Intensity Infrasonic Acoustic Test System

Abstract

We describe the design, mathematical modeling, construction, and test of an acoustic test system intended to support the performance of high-intensity acoustic effects experiments on large targets at low-sonic to infrasonic frequencies. An early experimental version of the system, HILF1, used a compressed-air source and airflow modulator from the ARL Mobile Acoustic Source (MOAS) and a single-volume Helmholtz resonator test chamber to achieve sound pressure levels (SPL) above 140 dB in a 5-cu m volume. Based on results from this system, a more advanced system, HILF2, was designed and built. HILF2 uses a compressed-air source based on automotive superchargers, a low-impedance airflow modulator, and a two-volume Helmholtz resonator test chamber to achieve sustained high-purity sinusoidal sound pressure levels in excess of 155 dB in a 2.5-cu m test volume at frequencies from 2 to 20 Hz.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2001
Accession Number
ADA399241

Entities

People

  • Bruce T. Benwell
  • Christian G. Reiff
  • H. E. Boesch Jr.

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Air Compressors
  • Air Pressure
  • Compressed Air
  • Compressors
  • Construction
  • Electrical Circuits
  • Energy Transfer
  • Frequency
  • Impedance
  • Measurement
  • Military Research
  • Nonlethal Weapons
  • Pressure Measurement
  • Research Facilities
  • Resonant Frequency
  • Sound Pressure
  • Test Facilities

Fields of Study

  • Physics

Readers

  • Auditory Neuroscience/Auditory Physiology.
  • Electrical Engineering
  • Microwave Engineering.