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Description
Floor impact sounds are mainly divided into light-weight and heavy-weight, and different measurement equipment and evaluation methods are required according to each characteristic. Using both types of impact sources in a real experimental environment is time-consuming and resource-consuming, and there are limitations in terms of repeatability and reproducibility. Rubber balls, which are heavy-weight impact sources, may experimental errors increase depending on the impact position or drop angle due to the free-fall method. Accordingly, there is a need for a simpler and more reliable measurement method. To simplify this measurement method, this study aims to examine the possibility of evaluating heavy-weight characteristics including low frequency bands (50, 63, 80 Hz) by excluding existing rubber ball impact sources and using only tapping machines. By analyzing the low frequency band response of the tapping machine, we want to explore its applicability as a heavy-weight impact source and present a more practical and consistent evaluation technique. As a result of analyzing the single numerical evaluation amount of the existing rubber ball impact source and tapping machine focusing on the low frequency band, which is the heavy-weight evaluation frequency, the correlation coefficient between the two impact sources is not high. It can be seen that the correlation coefficient for each frequency is very high. This is thought to be a difference according to the method of evaluation rather than a problem with the impact source. If only an appropriate evaluation method can be proposed, evaluation of the low frequency band using a tapping machine is likely to be valid.