Accession Number:

ADA465761

Title:

Sound Radiation from an Enclosure

Descriptive Note:

Technical rept. May 2000-Sep 2002

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB

Report Date:

2002-09-05

Pagination or Media Count:

78.0

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 enclosures 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.

Subject Categories:

  • Numerical Mathematics
  • Acoustics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE