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Effects of Trim tab on High Speed Vessel‘s Performance

Tamaddondar, Mohammad Hashem | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40494 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Sayyadi, Hassan; Seif, Mohammad Saeed
  7. Abstract:
  8. Wide range application of high speed marine crafts in marine industry and other related industries results in attempts to improve the performance of such vessels. The main ideas of using control surfaces in high speed planing crafts are the change of the high speed planing craft‘s resistance due to change of their running attitudes and wave response mitigation of this vessels. Control surfaces produce forces and a pitching moment due to a pressure distribution caused by them, which can be used to alter the running attitude of high speed marine crafts. The present work contains a comprehensive study on trim tab as a control surface for the high speed crafts. The results of this study condense into six main chapters. First two chapters are about the various control surfaces of the high speed marine crafts with emphasis on trim tab. In the third chapter, the effect of trim tab is taken into account in the Savitsky formula and the performance of planing crafts equipped with trim tab is studied. Moreover, a code using MATLAB software is developed to calculate the resistance, trim angle and effective power of planing crafts which are either equipped with trim tab or not, in the planing and pre-planing condition. The CFD analysis of a planing craft equipped with trim tab is performed in the fourth chapter using ASYS-CFX software. By doing so, flow characteristics of equipped hull and forces producing by trim tab are discussed. The fifth chapter deals with a prevalent dynamical instability in planing crafts known as porpoising and how trim tab can eliminate this instability. Finally, the sixth chapter encompasses conclusion and suggestions to further this study in future
  9. Keywords:
  10. High Speed Craft ; Computational Fluid Dynamics (CFD) ; Resistance ; Trim Tab ; Dynamic Instability

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