The Improvement of Resistance and Propulsion Related Experimental Techniques and Data Analysis for Ship Model Test

  • 吳 政翰

Student thesis: Master's Thesis


After some new experimental technologies of main ship model tests was successfully established we still need improve the accuracy of those tests and the performance prediction method The purpose of this research is also to study whether the procedure can obtain the same results by applying to different ships after repeatedly tests and comparing with the statistical data of foreign towing tank in order to promote the reliability and the commercialization of NCKU towing tank The steel cable method of resistance was established in NCKU towing tank The measuring system is set up on the LCB position and the height of steel cable is equal to the propeller shaft to avoid producing a moment After the resistance tests the performance prediction was improved in this research and shows high stability To calculate the thrust deduction we combine self-propulsion test which uses dynamometer to measure the revolution torque and thrust and the result from resistance test After several tests and improvement of experimental technologies we obtain the stable result from ship model R0 But due to the shaft being placed too tightly which leads to the uncontrollable friction the statistical data is therefore unstable though it still remains in the reasonable range The five-hole Pitot tube measurement system is located behind the stern of ship model R0 and used to measure the three-dimensional velocity profile of inflow on propeller plane namely axial velocity radial velocity and tangential velocity The purpose of this research is to improve the wake fraction interpolation estimation method Cubic hermite spline was found the best curve fitting method among others for wake survey data interpolation in radial direction
Date of Award2015 Aug 25
Original languageEnglish
SupervisorJeng-Horng Chen (Supervisor)

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