Sound Transmission through Ducts.

Abstract

This report covers analytic studies describing the propagation of sound waves in acoustically lined ducts. These ducts are typically found in quieted high bypass turbine engine nacelles. Fortran IV computer programs were written for a CDC 6600 computer to predict maximum exponential attenuation of a least naturally attenuated mode in rectangular, annular, and cylindrical ducts either uniform or sheared flow. Additional programs were written to design optimum perforated plate liners. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1978
Accession Number
ADA057803

Entities

People

  • Eugene P. Hoffman
  • John J. Schauer
  • Robert W. Guyton

Organizations

  • University of Dayton

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Cyber
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Impedance
  • Acoustic Propagation
  • Acoustic Velocity
  • Acoustic Waves
  • Acoustics
  • Boundary Layer
  • Computer Programs
  • Department Of Veterans Affairs
  • Differential Equations
  • Eigenvalues
  • Mach Number
  • Partial Differential Equations
  • Plastic Explosives
  • Pressure Distribution
  • Pressure Gradients
  • Sound Transmission
  • Turbojet Engines

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Combustion and Flow Dynamics.
  • Computer Science.