What does it mean when damped imaginary frequency is zero? I am using the QRDAMP modal solver and there is damping in the model.
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Development advised that in this case a zero imaginary component of frequency indicates a mode is over damped. Mode 3 is a rigid body mode of the structure bouncing vertically on bearing elements 70002, 70003, 80002 and 80003. They have values of stiffness and damping which I think represents overdamping at 95.3 Hz. The ratio of critical can be computed as (c/k)*pi*f. |
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