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Sampling rate effect on wedge pressure record in water entry by experiment

机译：试验中楔形压力记录的采样率效应

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摘要

Water entry experiment is the most reliable method by which impact pressures on marine structures are measured. Several parameters have to be controlled during the water entry experiments to obtain accurate and reliable results. Sampling rate of data acquisition system is one of the influencing factors. In this paper, the effect of sampling rate on impact pressure on wedge water entry experiments is investigated. A wide range of wedges with deadrise angles of 5-35 are dropped into water at the entry velocity of 3.13 m/s and impact pressures are recorded with different sampling rates. Results are compared to analyze the effect of sampling rate on outcomes. Finally, to mitigate the negative aspects, some thresholds of sampling rate are determined for different wedges. It was found that for wedges with deadrise angles of 25 degrees and higher, a sampling rate of 25 kHz is adequate for this configuration. This sampling rate; however, is not appropriate for deadrise angles lower than 20 degrees where a higher rate is needed. Results indicate that the acceptable sampling rate for a wedge of 5 deadrise angle is 600 kHz at water entry velocity of 3.13 m/s.
机译：水入口实验是最可靠的方法，测量了海洋结构上的冲击压力。在水处理实验期间必须控制几个参数，以获得准确且可靠的结果。数据采集​​系统的采样率是影响因素之一。本文研究了采样率对楔形水进入实验对冲击压力的影响。在进入3.13米/秒的入口速度下滴入水中的宽范围为5-35，并以不同的采样率记录冲击压力。比较结果与分析采样率对结果的影响。最后，为了减轻否定方面，针对不同的楔形来确定采样率的一些阈值。发现，对于具有25度和更高的死亡角度的楔形，采样率为25kHz对于这种配置是足够的。这种抽样率;然而，不适合低于需要更高速率的20度的死亡角度。结果表明，在水入口速度为3.13米/秒的情况下，5个失去角度的楔形楔的可接受采样率为600 kHz。

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