Acoustic scattering and absorption by a rigid porous elliptic cylindrical shell
W. E. Zorumski, Langley Research Center, United States. National Aeronautics and Space Administration
National Aeronautics and Space Administration, 1971 - Technology & Engineering - 30 pages
Scattering of plane waves from thin rigid porous elliptic cylindrical shells and Mathieu function.
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accuracy accurate to eight angle of incidence APPENDIX Bessel function product Bessel function series characteristic values Coupling terms cylinder surface deg SR DR DISSIPATED POWER RATIOS Doctor of Philosophy DR SR DR eight significant figures elliptic cylinder elliptic cylindrical shell elliptical coordinate five significant figures four infinite sets Fourier series function product series Gegenbauer polynomial grazing incidence higher order functions incident power iNor(s intermediate frequency Jer(s Jor(s Langley Research Center Levin ref major axis Mathieu function series maximum dissipation occurs method of reduction minor axis normal incidence normal velocity obtained parallel planes periodic Mathieu function plane wave porous cylinder porous elliptic cylindrical porous material pressure drop radial functions radial Mathieu functions radial solutions ratio of scattered reference 12 resistance RIGID POROUS ELLIPTIC scattered and dissipated second kind sets of equations Solutions for scattering terms of Mathieu tions tricities velocity expansion velocity normal wavelength Wronskian relations zero