Damping loss factors and coupling loss factors are estimated for two sets of coupled plates, one set joined along a line and the other joined at a point Two levels of damping, achieved with constrained layer treatments are considered. For the more highly damped plates, the differences between estimations using transient force versus persistent force are small. As expected serious differences in estimated loss factor are found for lightly-damped plates, that is, with loss factors below 0.01 (1%).
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