拖曳水池标模阻力复合航次试验不确定度分析

Uncertainty Analysis of Ship Model Repeated Resistance Tests in Towing Tank

参考国际拖曳水池会议(ITTC)推荐的规程,对船模拖曳水池的阻力试验进行不确定度分析。根据船模阻力试验的流程,确定试验过程中的误差源;根据不确定度的传递方程,确定误差源对试验结果的影响;基于一艘船模标准模型进行带舵的复合航次重复试验,并根据试验误差源分析得到试验结果的不确定度。在此基础上,提出降低试验不确定度的方法。分析结果表明,在95%置信水平下(k=2),总阻力及其主要水动力系数的不确定度均小于1%,试验结果可作为标模基准校验使用。

Referring to the ITTC recommended guidelines, the uncertainty analysis of the ship model resistance test in towing tank is done. According to the procedures of the ship model resistance test, the uncertainties source in the test process is determined. According to the propagation of the uncertainty, the influence of the uncertainty source on the test result is determined. Based on a standard ship model, the repeat-run tests of the ship model with the rudder are carried out. According to the analysis of the uncertainty source, the uncertainty of the test results are obtained. On the basis, the method for reducing the test uncertainty is presented. The analysis results show that under the 95% confidence level(k=2), the total resistance and the uncertainty of the main hydrodynamic coefficients are less than 1%. The test results can be used as the benchmark calibration.