Number: Mech 123/94
Author(s): VEKSLER, N.D., IZBICKI, J.-L.
Title: Modal resonances of the Franz waves. 36 p.
Language: English
ABSTRACT. An approach is presented to find the modal resonances
of the Franz waves and the results are given of the resonances
computation for problems of a plane acoustic wave scattering by
the acoustically rigid and soft spheres and cylinders (for
oblique and normal incidence. The results obtained are compared
with the Franz wave asymptotics. The successive in order n modal
resonances are strongly overlapping in frequency and are
superimposing almost in antiphase, thus the modulus of the
superposition is smaller than that of every single modal
resonance. Therefore the influence of the Franz waves on the
total form function can be observed only at small frequency band.
The width of modal resonances at scattering by the rigid sphere
and cylinder is smaller than at scattering by the soft ones and
thus the contribution of the Franz waves in the total form
function is more pronounced at scattering by the rigid sphere and
cylinder.