THE ACOUSTIC IMPEDANCE OF A RIGID CIRCULAR PISTON WITHOUT A BAFFLE OR WITH A FINITE CONCENTRIC BAFFLE
ADMIRALTY RESEARCH LAB TEDDINGTON (UNITED KINGDOM)
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An expression for the self-impedance is derived for any size of baffle with piston sizes in the range kalpha 0.75 - 2. The unbaffled condition, as a particular case, provides a means of checking the expression against the few existing results derived by more advanced methods and good agreement is obtained. Certain sizes of finite baffle raise the self resistance and reactance somewhat above the infinitely baffled values.