TEST RESULTS FROM THE BOUNDARY LAYER FACILITY (THEORY AND EXPERIMENTAL COMPARISON)
BOEING COMMERCIAL AIRPLANE CO RENTON WA
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The problem of acoustic radiation of panels excited by random pressure fluctuation of the turbulent boundary layer was investigated. The main purpose of the paper is to show by using a relatively simple functional representation of the space-time correlation of the wall pressure fluctuation, and by the use of Lyons-Dyer method, that motion and radiation intensity of a simply-supported panel agree reasonably well with experimental results. The most striking feature of the excitation mechanism is the so-called coincidence which has profound effects on the response of the structure and power radiations. If, under certain conditions, a mismatch occurs between wave speeds on the panel and the pressure field, panel displacement and acoustic radiation should be reduced. Such a mismatch is caused by a turbulence pressure eddy which decays faster than the modes wavelength on the structure.
- Fluid Mechanics