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- W1970319081 abstract "The acoustic eigenfrequenciesfnsmin concentric spheroidal–spherical cavities are determined for both Dirichlet and Neumann boundary conditions. Two types of cavities are examined, one with spheroidal outer and spherical inner boundary and inversely for the other. The pressure field is expressed in terms of both spherical and spheroidal wave functions, connected with one another by well-known expansion formulas. When the solution is specialized to small values ofh=d/(2R2) wheredis the interfocal distance of the spheroidal boundary andR2the half length of its rotation axis, exact closed-form expressions are obtained for the coefficientsgnsm(2)andgnsm(4)in the resulting relationsfnsm(h)=fns(0) [1+gnsm(2)h2+gnsm(4)h4+O(h6)]. Numerical results are given for various values of the parameters." @default.
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- W1970319081 date "1997-09-01" @default.
- W1970319081 modified "2023-09-25" @default.
- W1970319081 title "ACOUSTIC EIGENFREQUENCIES IN CONCENTRIC SPHEROIDAL–SPHERICAL CAVITIES" @default.
- W1970319081 doi "https://doi.org/10.1006/jsvi.1997.1122" @default.
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