小水线面双体船总振动分析计算

发布时间：2018-04-06 04:35

本文选题：小水线面双体船　切入点：船舶总体振动　出处：《大连理工大学》2016年硕士论文

【摘要】：振动现象广泛存在于海上船舶的运行中,恶劣的振动可能危及航行船舶的安全,船舶总振动相关性能的预报对一条设计阶段的船舶具有十分重要的意义。小水线面双体船(SWATH)发展迅速,受到越来越广泛的关注。但同时,其特殊的船型决定了其振型复杂、容易产生耦合振动。与单体船相比,关于SWATH的振动特性的分析尚不成熟,在此背景下,本文采用ABAQUS声-固耦合法和基于二维边界元方法的切片理论,对某小水线面双体船的振动特性进行了分析研究,并对其计算结果尤其是典型振型进行了讨论总结。首先,介绍了船舶总振动分析相关的理论,总结比较了船体总振动分析的几种计算方法。讨论了附连水质量对振动分析的影响,及对本文应用的奇点分布法(SDM)求解速度势及附加质量进行了介绍。其次,对本文主要应用的声-固耦合法进行了介绍,包括声-固耦合法理论及Lanczos计算原理,并对软件分析的前后处理流程进行了说明。再次,使用两种计算方法对某小水线面双体船进行振动特性分析,提取“干”模态和“湿”模态的固有频率和振型。通过对振型的总结可知,由于SWATH结构形式特殊、潜体入水,形成了多种其特有的振型,潜体与主体耦合增加了振动的复杂性。通过两种方法的计算及比较,认为利用声-固耦合法解决SWATH的总体振动是可行及可靠的；以及使用SDM+PATRAN方法进行SWATH振动特性分析是可行的,这里考虑了双体间的互相影响。最后,讨论了点焊对船舶振动的影响。根据实际加工的焊距,通过释放节点的方式模拟点焊的效果,对比原模型计算结果,分析点焊对船舶振动的影响。
[Abstract]:The phenomenon of vibration exists widely in the operation of ships on the sea. The bad vibration may endanger the safety of navigation ships. The prediction of ship total vibration correlation performance is of great significance to a ship in the design stage.Small waterline catamaran (SWATH) has developed rapidly and received more and more attention.But at the same time, its special ship shape determines its vibration mode is complex, easy to produce coupling vibration.Compared with the single ship, the analysis of the vibration characteristics of SWATH is still immature. In this background, the ABAQUS acoustic-solid coupling method and the slice theory based on two-dimensional boundary element method are used in this paper.In this paper, the vibration characteristics of a small waterline catamaran are analyzed, and the calculation results, especially the typical modes, are discussed and summarized.Firstly, the theory of ship total vibration analysis is introduced, and several calculation methods of ship total vibration analysis are summarized and compared.The effect of attached water mass on vibration analysis is discussed, and the solution of velocity potential and additional mass by using singular point distribution method (SDM) in this paper is introduced.Secondly, the acousto-solid coupling method, which is mainly used in this paper, is introduced, including the theory of acousto-solid coupling method and the principle of Lanczos calculation, and the pre-and post-processing flow of software analysis is explained.Thirdly, the vibration characteristics of a small waterline catamaran are analyzed by two calculation methods, and the natural frequencies and modes of "dry" mode and "wet" mode are extracted.From the conclusion of vibration mode, it can be seen that because of the special structure form of SWATH, the submerged body enters the water, forming a variety of its unique modes, and the coupling between the submersible and the main body increases the complexity of vibration.Through the calculation and comparison of the two methods, it is considered that it is feasible and reliable to use the acousto-solid coupling method to solve the overall vibration of SWATH, and that it is feasible to use the SDM PATRAN method to analyze the vibration characteristics of SWATH. The interaction between the two bodies is considered here.Finally, the effect of spot welding on ship vibration is discussed.According to the actual welding distance, the effect of spot welding was simulated by releasing the joints, and the effect of spot welding on ship vibration was analyzed by comparing the results of the original model.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U661.44;U674.951

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