船模阻力试验不确定度分析与实践  

Uncertainty analysis and implementation of ship model resistance tests

作　　者：宋磊[1,2,3] 冯大奎 刘曾[1,2,3] 杨祥 SONG Lei;FENG Dakui;LIU Zeng;YANG Xiang(School of Naval Architecture and Ocean Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Hubei Provincial Engineering Research Center of Data Techniques and Supporting Software for Ships(DTSSS),Wuhan 430074,China;Hubei Key Laboratory of Naval Architecture&Ocean Engineering Hydrodynamics,Wuhan 430074,China)

机构地区：[1]华中科技大学船舶与海洋工程学院,湖北武汉430074 [2]船舶数据技术与支撑软件湖北省工程研究中心,湖北武汉430074 [3]船舶和海洋工程水动力湖北省重点实验室,湖北武汉430074

出　　处：《实验技术与管理》2025年第3期37-43,共7页Experimental Technology and Management

基　　金：国家自然科学基金面上项目(12472243);华中科技大学教学研究项目(2022061,2024080);华中科技大学实验技术研究项目(2024074);华中科技大学仪器设备开放共享基金项目(KFGX2025004)。

摘　　要：该文以某艇为研究对象,分析了其阻力试验过程中的误差源,结合二因次换算公式推导不确定度传递方程;按照线型加工缩比模型并在不同时间段开展重复试验,将测试结果换算至名义温度(15℃)状态下的总阻力系数和姿态数据;按照不确定度传递原则分别分析模型精度、水物理特性、传感器精度和重复试验的不确定度,并完成合成不确定度计算。分析不确定度结果可得,为了试验测试精度,应在硬件条件允许的范围内尽量选择较小的缩尺比,针对较大模型和较大航速状态开展试验,同时对非排水型船,即使在阻力试验中也应保证重量分布与实船一致。[Objective]The International Towing Tank Conference(ITTC)imposes very strict requirements for testing ship hydrodynamic performance,and it is recommended to conduct an uncertain analysis of the test results of a ship model as part of the test result report.This uncertainty analysis is carried out on the resistance test results of the ship model;furthermore,the credibility of the test results is measured,the proportion of each component in error is analyzed,and a feasible plan is proposed for large error sources so as to further improve the accuracy of the test results.[Methods]Taking a boat as the research object,the error source in the drag test process was analyzed,and the uncertainty transfer equation was derived by using a two-factor conversion formula.According to a linear processing scale model,repeated tests were carried out in different time periods,and the total drag coefficient and posture data at a nominal temperature(15℃)were derived from the test results.According to the uncertainty transfer equation,the model accuracy,hydrophysical properties,sensor accuracy,and repeated test result uncertainty were analyzed,and the synthesis uncertainty was calculated.[Results]An analysis of experimental results shows that the accuracy of the model is relatively high in the synthesis uncertainty of the total drag coefficient,which is mainly due to the small size of the model,and the sensor error accounts for a large proportion of the total displacement,which is finally transmitted to the total drag coefficient affecting the wet area and length of the waterline.For the trim angle and heave,the main uncertainty comes from repeated tests.Preliminary analysis shows that for the investigated boat,only the total displacement and waterline ballast are maintained at the corresponding state in the process of drag ballasting,and the weight distribution(mass moment of inertia,high center of gravity)is not adjusted,which may lead to inconsistent posture during the resistance test.[Conclusions]The following guidance is propos

关 键 词：阻力试验 不确定度 误差分析 

分 类 号：U661[交通运输工程—船舶及航道工程]