Sound Radiation from an Enclosure

Abstract

The goal of the analysis is to demonstrate that the noise radiated from an existing enclosure can be predicted using finite elements or experimental measurements for the structural vibrations and boundary elements for the acoustic analysis. Because the acoustic analysis proceeds straightforwardly once the structural vibrations have been determined, the finite element analysis is the main obstacle to making the predictions. Standard "modal assurance criteria" (MAC) analyses are used to directly compare experimental measurements and finite element results and assess the accuracy of the finite element models. Methods for modeling rib-stiffened components are discussed extensively because of their importance in transmitting forces from the enclosure's shelves to its outer skin. The general conclusion is that this type of analysis is very useful for better understanding basic radiation mechanisms, but presently is not accurate enough for precisely predicting radiated noise levels.

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Document Details

Document Type
Technical Report
Publication Date
Sep 05, 2002
Accession Number
ADA465761

Entities

People

  • J. B. Fahnline
  • R. L. Campbell
  • S. A. Hambric

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Algorithms
  • Boundaries
  • Computational Fluid Dynamics
  • Experimental Data
  • Finite Element Analysis
  • Frequency
  • Measurement
  • Mechanical Properties
  • Noise
  • Pressure Measurement
  • Radiated Noise
  • Radiation
  • Standards
  • Three Dimensional
  • Transfer Functions
  • Vibration

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Structural Dynamics.
  • Systems Analysis and Design