Dynamic Analysis of Torsional Vibration of Ship Shaft

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Maleki, Ali | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 44859 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Sayyadi, Hasan; Mehdigholi, Hamid
Abstract:
Torsional vibration is a phenomenon that caused shear in rotational shafts by out of center torsion. This issue must be considered in design of shafts. Unfortunately,the rules for designing shafts that suggested by standards causes that producers don’t try to usefurther calculation for designing shafts.
In this thesis, at first and by use of finite element method and ANSYS, a shaft of a vesselthat designed based on BV rule was modeled in the software, then, the model was analyzed by modal analysis of the software. In the next level, by specifying the defect of designed shaft, optimizing of shaft’s system to minimize the first torsional natural frequency is applied. In this case, by use of changing the shaft’s material, choosing the best material to reach this goal is done. Finally, the new shaft system is analyzed for stresses of torsional vibration in order to check the reliability of new material
Keywords:
Dynamic Analysis ; Torsional Vibration ; Shaft System ; Modal Analysis

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