Prediction of Acoustic Cavity Modes by Finite Element Methods

Abstract

A finite element method for acoustic cavity modal analysis is presented. The approach utilizes the VAST finite element program eigensolution routines operating on equivalent acoustic mass and stiffness matrices generated from the program ACOUSTIC. Both closed and open cavities can be treated, within the assumption of rigid boundaries. Two elements have been implemented in ACOUSTIC; a 20-noded isoparametric brick element and an 8-noded isoparametric axisymmetric element. The performance of the analysis system has been evaluated via comparison to both analytical and experimental results, and good agreement has been found. Keywords: Finite elements, Frequency analysis, Vibration, Cavities, Modal analysis, Acoustics, Numerical methods, Eigenvalues, Natural modes, Canada.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1989
Accession Number
ADA206921

Entities

People

  • Stephen Tang
  • Thomas A. Vernon

Organizations

  • Defence Research and Development Canada

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acoustics
  • Axisymmetric
  • Boundaries
  • Differential Equations
  • Eigenvalues
  • Equations
  • Finite Element Analysis
  • Frequency
  • Frequency Response
  • Geometry
  • Modal Analysis
  • Numerical Analysis
  • Power Spectra
  • Pressure Distribution
  • Pressure Gradients
  • Resonant Frequency
  • Stiffness

Fields of Study

  • Engineering
  • Physics

Readers

  • Control Systems Engineering.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)