浅海底座的波浪扰动力

Wave Forces on a Bottom in Shallow Sea

在中国船舶科学研究中心的波浪水池中完成了浅海底座波浪扰动力模型试验。 最近Chakrabarti发表论文介绍了一个浅海底座波浪扰动力的模型试验,在他的实验中由于测试技术的需要必须在浅海底座模型与波浪水池池底间保留一个间隙,其后果是由于间隙的存在导致波浪垂向扰动力大幅度下降。为此Chakrabarti提出了有间隙底座(OPen-bottom)波浪扰动力的计算方法。 为了解决这个测试技术上的问题,在我们的模型试验中采用了泡沫塑料软垫(重150g,厚3mm)封闭了底座间隙。我们认为:此试验状态更切合实际。此外,本文还给出了三维势流理论对无间隙底座的计算结果,并与模型试验实测结果进行了比较,其结果表明:理论计算结果与模型试验结果十分一致。

Model tests were conducted to measure the wave forces on a bottom in shallow sea at wave tank of China Ship Scientific Research Center.In a recent paper, Chakrabarti performed model tests of wave forces on an open-bottom. The load measuring technique necessitated a gap between structure bottom and tank floor. The measured vertical forces experienced a significant reduction, due to this gap, so that Chakiabarti suggests a computation method of wave forces on the open-bottom.To solve this problem of measuring technique, in our model tests the gap was closed by using a soft foamed plastics (weight is about 150g and the thickness is 0.3cm). The test case is closer to the real situation. In this paper we also have carried out calculation by using 3-D potential program. The computation results were in very well agreement with experimental in waves.