I tried to solve the problem
that a rigid disc under harmonic moments resting on a porous half-space, the
porous medium is modeled using Biot's theory, when I consider the disc as
totally impervious, I found from the numerical results that negative damping
appears when the permeability of the porous medium is very low at a small
exciting frequency. I have no idea whether this is possible, can someone give
me some suggestions? Thanks very much.
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