Accession Number:

ADA464892

Title:

Numerical Predictions for the Demo Enclosure Comparison to Experiment

Descriptive Note:

Technical rept.

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB

Report Date:

2004-05-01

Pagination or Media Count:

49.0

Abstract:

Numerical methods for modeling the surface vibrations and sound radiation from a small enclosure are investigated, with special emphasis on simple methods for representing the connections. Finite element methods are used for the structural vibrations and the accompanying sound radiation is computed using the boundary element method. It is shown that good results can be obtained by simply adjusting the resonance frequencies for the modes to agree with experimental measurements. This assumes that the modes are fairly similar and that a one-to-one correspondence can be established between the numerical and experimental results. It is also shown that the technique of analyzing the components separately and combining them together using adding stiffnesses performed as well or better than trying to model the connections directly. The technique is also well-suited to optimization problems because numerous cases can be analyzed much more quickly than the more direct technique. Comparisons to experimental measurements show that the strategies for combining the components worked better for the more rigid connections than they did for the softer configurations.

Subject Categories:

  • Numerical Mathematics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE