In a message dated 10/3/02 7:42:46 PM, lalofs@ENTERACT.COM writes: << So, Frank, would you like to explain the difference between positive and negative dampening. I guess physics majors like me need more practical ME training. >> Well, as a chemist myself, I look at the dampening coefficients and if they are positive then the action is energy dissipation and a reduction in the peak amplitude of the wave. If some of the coefficients are negative, I have understood that case as resonance and amplification of those frequencies. Of course the a full negative solution in which the total energy is increased or amplified is unreasonable, but partition with amplitude enhancement at lower frequencies is plausible. So, to zeroth order, positive dampening is isolation, negative dampening is amplified resonance. All part of a carefully constructed pablumesque world view designed to shield me from the world of partial differential equations! Frank Grunthaner |
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