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Description
Accurate estimation of radiated sound power from lightweight facade systems is challenging due to their complex vibro-acoustic behavior, particularly at higher frequencies. Vibration-based approaches, such as those based on the Acoustic Radiation Matrix (ARM), offer an efficient framework for predicting sound power from measured surface velocities, but discrepancies are often observed when compared with standardized measurements.This study investigates the influence of spatial discretization on vibration-based sound power estimation for an ETFE cushion system using scanning laser Doppler vibrometry. A grid refinement analysis is performed to assess the effect of measurement resolution on the predicted sound power. The results show that insufficient spatial sampling leads to systematic underestimation at higher frequencies due to unresolved spatial variations in the vibration field. Based on these observations, a spatial sampling criterion is proposed to ensure reliable sound power estimation.