Fluidic Noise Shield

Abstract

We are introducing a new "smart material" for acoustical applications, i.e., a material for active control of sound. Smart materials incorporate into their structure the sensing, actuation and control functions of an active-control system. The new concept makes use of fluidics for all three of these functions. Because of this there is no need for transduction, and the system operates entirely in the fluid domain without moving parts or electrical input. A short background on some principles in fluidics is given before the new concept is described. Then the application of this technology to airplane interior trim is introduced. Analysis and experiments in progress on the NASA program are described.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2000
Accession Number
ADA392373

Entities

People

  • Andres Andersson
  • Michael Ladd

Organizations

  • Boeing

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Sensors

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Waves
  • Acoustics
  • Actuators
  • Air Conditioning
  • Aircrafts
  • Airframes
  • Airplanes
  • Boundary Layer
  • Control Systems
  • Fluidic Amplifiers
  • Frequency
  • Frequency Bands
  • Noise Reduction
  • Passenger Aircraft
  • Sound Waves
  • Steady Flow

Readers

  • Aerospace Engineering
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Systems Analysis and Design