A NOTE ON THE DESIGN OF FLEXIBLE-WALL, VOLUME RESONATOR ACOUSTIC FILTERS.
HYDRONAUTICS INC LAUREL MD
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The behavior of flexible-wall, volume-resonator acoustic filters in liquid-filled pipes can be predicted accurately over a wide frequency range by means of existing theory. However, for design purposes, a simple method for the selection of the major parameters of the filter, and the effect of the variation of these parameters upon the filter performance, needs to be made available. Results are presented herein, which will enable one to select an approximate value of the attenuation parameter for given requirements. Additional results show the effect of the variation of the tail pipe parameter on the filter performance. These findings aid in the proper placement of the filter from the open end of the pipe. Experimental results of tests on a resonator filter with three different connectors are presented. These tests indicate that the values used for the conductivity of the connectors and the theoretical predictions of the filter performance are correct. Author