Verification on prediction method of floor impact sound using vibro-acoustic coupling effect

Abstract

The impact noise generated in concrete structures exhibits complex behavior due to the interaction between vibration and sound, making it difficult to predict. To achieve accurate predictions, it is important to consider the interaction between vibration and sound and input reliable data. In this study, a governing equation that considers the interaction between vibration and sound was proposed and validated using relatively reliable vibration data as input. Vibration and sound data were obtained from a mock-up house built with a structure similar to that of an actual residential building. The vibration data was analyzed using time history and modal decomposition to confirm the interaction between vibration and sound. Subsequently, the proposed governing equation was used to calculate the sound data by inputting the vibration data, which was then compared and analyzed against the measured data. In the time history analysis, it was observed that the calculated data after 0.8 seconds exhibited relatively less attenuation, suggesting a higher damping ratio in the mock-up house than anticipated. Furthermore, the modal decomposition comparison revealed a slight shift in the mode frequency from 43.0 Hz to 43.6 Hz, and the spectrum showed larger values in the calculated data, which can be attributed to the damping ratio. Further research on the damping ratio in residential buildings is planned to improve the accuracy of the prediction in the vibration-sound system.