实验技术与管理2025，Vol.42Issue(3)：37-43,7.DOI:10.16791/j.cnki.sjg.2025.03.005
船模阻力试验不确定度分析与实践
Uncertainty analysis and implementation of ship model resistance tests
摘要
Abstract
[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 proposed for the design and implementation of experiments:in the experimental design stage,the scale ratio should be reduced under the premise of fully considering the capacity of an instrument and equipment and the influence of the blocking effect to ensure a larger model scale and speed.For non-displacement boats,to reduce the uncertainty of the test results when carrying out posture tests,the debugging and calibration of the model weight distribution can be considered.关键词
阻力试验/不确定度/误差分析Key words
resistance test/uncertainty/error analysis分类
交通工程引用本文复制引用
宋磊,冯大奎,刘曾,杨祥..船模阻力试验不确定度分析与实践[J].实验技术与管理,2025,42(3):37-43,7.基金项目
国家自然科学基金面上项目(12472243) （12472243）
华中科技大学教学研究项目(2022061,2024080) （2022061,2024080）
华中科技大学实验技术研究项目(2024074) （2024074）
华中科技大学仪器设备开放共享基金项目(KFGX2025004) （KFGX2025004）
