船舶和海洋技术. 船舶设计中螺旋桨空化噪声评估的模型试验方法. 第1部分：源电平估计

[中文适用范围]： 本文件规定了船舶设计中螺旋桨空化噪声评估的模型试验方法。 该过程包括噪声源再现、噪声测量、后处理和缩放。 目标噪声源是螺旋桨空化。 因此，本文件描述了基于模型和船舶之间的相似定律再现船舶空化模式的测试设置和条件。 螺旋桨噪声分三个阶段进行测量。 每个阶段的测量目标是螺旋桨空化噪声、背景噪声和传输损耗。 对于源级评估，对测量的螺旋桨空化噪声应用背景噪声和传输损耗的校正。 最后，使用缩放定律根据模型尺度结果估计全尺度源水平。 [外文原描述]： ISO 20233-1:2018 specifies a model test method for propeller cavitation noise evaluation in ship design. The procedure comprises reproduction of noise source, noise measurements, post processing and scaling. The target noise source is propeller cavitation. Thus, this document describes the test set-up and conditions to reproduce the cavitation patterns of the ship based on the similarity laws between the model and the ship. The propeller noise is measured at three stages. The measurement targets for each stage are propeller cavitation noise, background noise, and transmission loss. For the source level evaluations, corrections for the background noise and the transmission loss are applied to the measured propeller cavitation noise. Finally, the full-scale source levels are estimated from the model scale results using a scaling law.