Vibration Isolation of a Microphone.

Abstract

A microphone vibration isolation system using a bungee elastic suspension, designed for use in a system (NASA Project G-313) to measure the ambient noise in the Space Shuttle's payload bay during launch is described. The isolator's transmissibility was measured using a computer controlled shaker table system programmed to simulate the Shuttle's vibrational spectrum in 21 third octave bands between 20 and 2000 Hertz. Static deflection and transient response measurements verified the axial and radial transmissibility measurements. Free decay measurements were made at 5, 20, and 65 C. The isolator's natural frequency of 15 Hertz represents a substantial improvement over the isolator used previously whose lowest resonance was above 100 Hertz. Test procedures and calibration data for three microphones are included. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1985
Accession Number
ADA161018

Entities

People

  • Charles D. Stehle

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Measurement
  • Acoustic Waves
  • Acoustics
  • Amplifiers
  • Bandwidth
  • Computer Programs
  • Computers
  • Elastic Properties
  • Frequency Bands
  • Materials
  • Modulus Of Elasticity
  • Resonant Frequency
  • Sound Pressure
  • Spectra
  • Test Equipment
  • United States
  • Vibration Isolators

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Aerospace Test and Evaluation
  • Structural Dynamics.

Technology Areas

  • Space