Virginia Tech. Engineering Science and Mechanics DepartmentJordan University of Science & TechnologyAsfar, Omar R.Hawwa, Muhammad A.2015-05-282015-05-281993-05-01Asfar, Omar R., & Hawwa, Muhammad A. (1993). Torsional mode coupling and filtering in a composite waveguide with multiperiodic interface corrugations. Journal of the Acoustical Society of America, 93(5), 2468-2473. doi: 10.1121/1.4058670001-4966http://hdl.handle.net/10919/52735This study is concerned with the interaction of six torsional modes in a composite axisymmetric waveguide whose interfaces are sinusoidally corrugated in the axial direction. The modes are interacting when two resonant conditions on the codirectional modes and a Bragg condition occur simultaneously. In light of the weakness of the interface corrugations, the perturbation method of multiple scales is used to derive the mode coupling equations. A novel numerical scheme for two-point boundary-value problems is used to solve the coupled amplitude equations. The power reflection coefficient of a filter section is then calculated for the cases of uniform, tapered, and chirped corrugations. An optimal filter is realized by combining both taper and chirp thus producing a nearly ideal characteristics.6 pagesapplication/pdfen-USIn CopyrightChirpingPerturbation methodsReflection coefficientArticle - Refereedhttp://scitation.aip.org/content/asa/journal/jasa/93/5/10.1121/1.405867https://doi.org/10.1121/1.405867