March 1975 ONR R and D Towed Array Sea Trial Results

Abstract

New acoustical and vibrational data were acquired using the ONR R and D Towed Array in Sea Trial 5H4, conducted in March 1975. Limitations on valid array self-noise measurements due to towship radiated noise were investigated. The possibility of noise generation by the ribbon-faired towcable was examined. The quieting effects of a long neutrally-buoyant towcable section and of long Vibration Isolation Modules were evaluated. Effects of various hosewall materials on array module self-noise were evaluated. Acoustical scattering from an intentionally inserted scattering object was investigated. Several new array acoustical and vibrational sensors were tested. Hydromechanical measurements were made to characterize the towing conditions. Good-quality analog magnetic tape recordings of sensor outputs suitable for future coherence signal processing analysis were obtained. The report documents the results and presents several recommendations for improvements needed in future sea trials involving the ONR R and D Towed Array.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1975
Accession Number
ADC002894

Entities

People

  • David Walters
  • Jesse S. Diggs
  • John F. Waters

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustics
  • Acquisition
  • Ambient Noise
  • Boundary Layer
  • Classification
  • Composite Materials
  • Construction Materials
  • Corporations
  • Data Acquisition
  • Data Analysis
  • Detectors
  • Frequency
  • Frequency Bands
  • Magnetic Tape
  • Materials
  • Measurement
  • Military Research
  • Propulsion Systems
  • Radiated Noise
  • Tape Recording
  • Test And Evaluation

Readers

  • Acoustical Oceanography.
  • Acoustics.
  • Phased Array Antenna Design.