The Measurement of Plate Vibration and Sound Radiation from a Turbulent Boundary Layer Manipulator

Abstract

Two Boundary Layer Manipulators (BLMs) made of thin honeycombed aluminum were placed in a turbulent boundary layer flow. Sound intensity measurements were taken in order to determine the Mach number dependence of sound radiation. We found that sound intensity levels follow a power law consistent with dipole radiation. We made estimates of intensity levels for the BLMs in water using our measurements in air. Our estimates predict low radiation levels when mounted on naval vessels. Vibration levels were increased when undamped BLMs were installed in our wind tunnel facility. However, vibration levels were very low, and consequently sound radiation due to plate vibration was too low to be measured. Damping of the BLMs dramatically reduced vibration levels as well as direct radiation from the BLMs.

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Document Details

Document Type
Technical Report
Publication Date
Aug 15, 1991
Accession Number
ADA240127

Entities

People

  • K. Herbert
  • Mark C. Phillips
  • P. Leehey

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Acoustics
  • Air Flow
  • Boundary Layer
  • Control Surfaces
  • Flow
  • Fluid Dynamics
  • Fluid Mechanics
  • Frequency
  • Frequency Bands
  • Mach Number
  • Materials
  • Measurement
  • Military Research
  • Physics Laboratories
  • Turbulent Boundary Layer
  • Underwater Acoustics
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Fluid Dynamics.
  • Robotics and Automation.