Abstract
The measurement of a decay curve or a frequency response is usually used to measure the loss factor of panels. Using an FFT analyzer, the phase shift was observed near the resonant frequency in this study. The loss factors measured from the phase shift and other methods were in good agreement except for the cases of higher loss factors at frequencies of higher modes of the panel. Theoretically, the loss factor is inversely proportional to the radiated sound power if the signal is random. In this study, the sound‐pressure levels radiated from various panels of the same size and different loss factors were measured. They agreed fairly well with the predicted values, but the results for the panel with very low damping exhibited discrepancies from the theoretical values. This was due to the influence of the internal impedance of the panel as a vibrational source.
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