Sound from Turbulent Boundary Layer Excited Panels.
Abstract
The acoustic power radiated by thin flexible panels excited by turbulent boundary layer pressure fluctuations is estimated using a modal analysis, light fluid loading effects being included. Previous estimates of the modal radiation coefficients are improved, an extension being made to include the transition region where the acoustic wave length is comparable with the panel dimensions. The assumption of equipartition of the modal energies in a frequency band is used to account for the fluid loading effects. Predictions based on this assumption and also made by neglecting fluid loading are compared with experimental results obtained in air. It is shown that where the predictions are not equal they form effective upper and lower bounds, suggesting that some, at least, equipartition of modal energy occurs. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1969
- Accession Number
- AD0856121
Entities
People
- Huw G. Davies
Organizations
- Massachusetts Institute of Technology