【作者】 胡伟；

【导师】 刘刚；

【作者基本信息】 武汉理工大学 ， 机械设计及理论， 2006， 硕士

【摘要】 随着我国经济贸易显著加强,国家对外进出口额逐年增加,由此而带来的港口和船舶货运吞吐量也大幅增长。船舶起重机是大型船舶必备的自装卸机械,具有灵活,便捷,适应性广等优点,其应用越来越广,作用愈来愈大,同时对起重机的技术要求也越来越高。尤其是计算机技术的广泛应用,促使了许多跨学科的先进设计方法出现,推动了起重机新的设计技术和制造技术的提高。激烈的国际市场竞争也越来越依赖于技术的竞争。这些都促使起重机的技术性能进入崭新的发展阶段。 本文运用CAE技术对船舶起重机塔体结构进行了结构静力分析,以及优化和可靠性研究,主要研究内容如下: 1.应用软件ANSYS对复杂塔体结构进行建模研究,探索建立符合力学模型的空间非规则结构的建模方法;分析塔体结构的承载能力,为塔体结构的设计和优化提供依据和指导。 2.对某型号的船舶起重机塔体结构的受力和边界条件约束进行了分析,采用两种不同的约束方式,建立有限元模型进行对比,从中得出了一些有意义的结论。 3.针对该塔体结构模型复杂,编制常规的APDL命令流分析困难,本文着重阐述了一种新的实现方法,并用这种方法重建出塔体结构的有限元模型,并将这种方法建立的命令流文件成功应用于塔体结构的优化设计和可靠性分析中。 4.对塔体结构的优化进行了研究,采用合适的优化策略和优化算法,在保证塔体结构承载能力的前提下,有效降低塔体结构自重。 5.对优化后的塔体结构进行了可靠性分析,针对该塔体结构多孔多门的缺陷结构,按有关理论计算了钢材屈服强度的均值和方差。使用蒙特卡罗(Monte Carlo)方法进行求解,重点进行了该塔体结构的可靠性统计结果和趋势结果的分析研究。更多还原

【Abstract】 With the development of economical trade of China, the national foreign import and export volume increases year by year. This leads to largely increase of the harbor and freight transportation. Ship cranes have many advantages such as flexible and adaptable. It is shown that ship cranes are playing more and more important roles in the world. This also requires ship cranes to having stricter technical capability. On the other side, the broad application of computers stimulates the appearance of many advanced design methods over the single subject, which promotes the design and manufacture standard of ship cranes. As we all know, the intense international market competition relies on the technical competition closely. This will spur crane’s technical capability up to a new development step.This paper has an optimization analysis and reliability research on a housing structure of a new style of ship crane,with the method of CAE and advanced design technology. The main research items are as follows:1. The method of building complicated models of housing structure is studied based on the famous software ANSYS. We also analyze the load capability of the housing structure, preparing for the following study of structural optimization.2. Research is carried on the force and boundary restriction of the housing structure on the ship crane. Using different boundary restriction methods, we find some useful conclusions for design and manufacture.3. This paper realizes a new method to write the APDL orders of the housing structure, due to the common ways of writing APDL is difficult for this kind of complex model. The paper also applies the APDL analyse files to optimization design and reliability research of the housing structure successfully.4. Optimization design is conducted to the housing structure.Adopting the appropriate optimized strategy and algorithm, under the premise of guaranteeing housing structure’s load-carrying capacity, we reduce the housing structure’s weight effectively.5. Reliability research is carried on the optimized housing structure. Aiming atthe housing’s gap structure of multi- gates ,we calculate the mean and variance value of steel’s yield strength according to related theories. We use the Monte Carlo method for solution and analyze the probability statistical result and the tendency result with emphasis.更多还原