Influence of sampling rates on sloshing pressures prediction

The aim of this study is to evaluate the influence of different sampling rates on sloshing peak pressures prediction. This study is performed for a long-duration sloshing test: 480 hours at full scale, generated by 96 five hours individual tests, at a low partial filling for one critical sea state regarding sloshing. For this study, two different measuring systems are considered: The first system, considered as the reference in this study, which processes the replicated signal, coming from pressure sensors, with peak memory cards. The equivalent sampling rate of such analog measuring system is 100 kHz. The second system which records the raw signal, coming from pressure, sensors at a 20 kHz sampling rate. This sampling rate corresponds to industrial practice. Moreover, this raw signal at a 20 kHz sampling rate is degraded at two other sampling rates of 10 kHz and 5 kHz. Then, the influence of these 3 sampling rates (5, 10 and 20 kHz) on sloshing peak pressure prediction is investigated through comparison with the reference sloshing pressure peak prediction coming from the peak memory cards which is equivalent to 100 kHz. This comparison relies on statistical tools such as different fitting distributions, goodness of fittings, estimated pressures and confidence intervals.