Accession Number : ADA244068


Title :   Acoustic Bloch Wave Propagation in a Periodic Waveguide


Descriptive Note : Technical rept.


Corporate Author : TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS


Personal Author(s) : Bradley, Charles E


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a244068.pdf


Report Date : 24 Jul 1991


Pagination or Media Count : 109


Abstract : The propagation of linear, dissipative acoustic Bloch waves in a periodic waveguide is investigated theoretically and experimentally. The waveguide under study is a rigid, fluid-filled, rectangular waveguide that is loaded with a periodic array of rigidly terminated rectangular side branches. Conditions for the existence of Bloch waves in the periodic waveguide are presented. Analytic expressions for the dispersion relation, the impedance function, and the Bloch wave function are derived. Measurements verify the predicted passband/stopband structure of the dispersion relation and show good agreement with the theory.


Descriptors :   *WAVE PROPAGATION , ARRAYS , WAVEGUIDES , DISPERSION RELATIONS , WAVE FUNCTIONS , IMPEDANCE , ANALYTIC FUNCTIONS , FUNCTIONS , RECTANGULAR BODIES


Subject Categories : Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE