| Summary: | 碩士 === 國立臺灣海洋大學 === 機械與輪機工程學系 === 93 === Abstract
The design of shafting alignment for high speed craft is one of the most important design progresses which related to the successful of ships construction and the safety of life at sea in term of shipbuilding. The purpose of this thesis is mainly to study problems of the propulsion shaft alignment over 100 gross tons high speed crafts built by the local shipyards. Main concerns are driven to adopt two design methodologies, the finite element method (FEM) and the three moment equation method (TMEM), to calculate the static reaction forces at shaft bearings for real case of propulsion shafting system, and then to compare these results with those original design values, such that the accuracy and reliability of currently used design methodologies can be verified and shown. It should be noted that the design target for the analysis to confirm these bearing reaction forces are fully complied with the requirements of High Speed Craft Code of Classification Society, and to meet the original design values in a static shafting alignment analysis.
As a result, it shows that the numerical solutions for static shafting bearing load of real cases by using two design methodologies, which match well with the original design values obtained by shipyard. The maximum deviation of bearing load is -9.33%, and the minimum is -2.33% which was less than 15% of maximum acceptable design deviation for bearing load. It also found that the bearing pressure complied with the requirements of 0.55N/mm2 for High Speed Craft Code of Classification Society. Moreover, the maximum design truncation error for evaluation the reliability and accuracy to the real case of shafting is 1.43% which was less than 2.0% - 2.5% of acceptable design range.
The conclusion to this study is verified that the two design methodologies can further be applied to the practical design of shafting alignment for high speed craft. It is not only to provide the reliable calculation program and software of static shafting alignment for high speed craft, but also offer more reliable design information of shafting alignment for local shipyard’s designer and the researcher in the future. Besides, it also offer a safer and more reliable guarantee for marine propulsion shafting and reduce the possibility of machinery damage and malfunction and thus, they can promote the safety of life at sea, and the whole running and economical efficiency for the ship owner.
Key words: High Speed Craft, Shafting Alignment, Finite Element Method, Three Moment Equation Method.
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