Closed-Loop Control of Acoustic Tones in Aircraft Cavities

Abstract

An experimental investigation of acoustic mode noise suppression was conducted with a cavity model at the U.S. Air Force Academy Subsonic Wind Tunnel. Analog and digital control systems were used to suppress Rossiter tones over the Mach number range 0.25 to 0.5. The effectiveness of different closed-loop control strategies was investigated, including PD type, adaptive and a flow physics based algorithm. Experiments showed the Rossiter modes to have either a strong single-mode character or weak multimode character depending upon Mach number.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2002
Accession Number
ADA400135

Entities

People

  • David R. Williams

Organizations

  • Illinois Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Aircrafts
  • Boundary Layer
  • Control Systems
  • Crystal Lattice Vibrations
  • Flow Fields
  • Fluid Dynamics
  • Hypervelocity Flow
  • Mach Number
  • Measurement
  • Static Pressure
  • Subsonic Wind Tunnels
  • Test Facilities
  • Transducers
  • Turbulent Mixing
  • United States Air Force Academy
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Optical Physics and Photonics.
  • Robotics and Automation.