Frequency

an example. Since coincidence in lightweight construction materials such as sheet metal, gypsum board, or thin wood panels occurs at a relatively high frequency (e.g., above 2ooo Hz), there is little practical impact from shearing effects since there is little sound transmission in this region.

Finite Panels—Resonance and Stiffness Considerations

For a finite-sized panel, an additional term must be added to the impedance at very low frequencies, to account for panel bending resonances. This term is given by (Leissa, 1969; Sharp, 1973)

where

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