Abstract
In various kinds of sound and vibration measurements, impulsive excitation is often used as well as stationary random excitation. Concerning such kinds of measurements using impulsive sound or vibration source, it has been theoretically cleared that, by squaring and time-integrating the measured responses of signals like sound pressure and vibration acceleration and by time-integrating the responses of sound intensity, equivalent results corresponding to those measured by stationary random excitation can be obtained. To examine the theoretical relations, three kinds of basic experiments relating to spatial distributions of sound pressure level, vibration acceleration level and sound intensity level were conducted and their validities have been confirmed. Further, as an application of impulsive excitation to practical sound radiation measurement, an experiment performed to investigate the noise reduction of an iron railway bridge made by hammering is introduced.
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