基于起重机动力学的RMG门架结构动态分析及优化设计

发布时间：2018-05-02 06:39

本文选题：轨道式集装箱龙门起重机 + 动力学分析　；参考：《武汉科技大学》2011年硕士论文

【摘要】：轨道式集装箱龙门起重机是一种广泛用于集装箱堆场装卸集装箱的大型起重机械。全球经济一体化和我国对外贸易的持续增长带动了我国港口物流运输业的蓬勃发展。因此,我们对作为港口物流运输主要工具的轨道式集装箱龙门起重机的性能要求也越来越高。具体来说,就是要求其额定起重量越来越大,运行速度越来越快,这使得起重机运行时的动载荷随之增大。另外,由于起重机在工作过程中,运动状态经常发生变化,存在着诸多不稳定工况,如载荷起升离地、行走时冲击及碰撞、大小车起动和制动等,在这些工况下起重机结构会受到不同程度的冲击和振动影响。这样以来,在对起重机械进行设计时就不得不考虑各种动载对机械结构的冲击影响,需要以动态设计的方法来对起重机械进行设计。本文首先研究了轨道式集装箱龙门起重机的静态和动态力学特性。通过静力学分析,确定了载荷位于梁中、梁端两种位置的危险点,并对其强度和刚度进行了校核;结合有限元参数化模型,对轨道式集装箱龙门起重机门架结构进行了模态分析,提取了前10阶固有频率及振型图,并对其结果进行了分析。其次对轨道式集装箱龙门起重机突然起吊的动载情况进行了瞬态分析。得到了轨道式集装箱龙门起重机起吊离地瞬间的动力响应,包括主梁垂直位移、垂直速度、垂直加速度与时间的响应曲线。最后通过结构动态优化设计方法,对整机结构重量进行动态优化设计。该方法既有效地减轻了整机结构的重量,又保证了整机结构具有良好的静、动态性能,达到动态优化设计的目的。
[Abstract]:Rail-type container gantry crane is a large-scale crane widely used for loading and unloading containers in container yard. Global economic integration and the sustained growth of China's foreign trade have driven the vigorous development of our port logistics industry. Therefore, the performance requirements of rail container gantry crane, which is the main means of port logistics transportation, are becoming higher and higher. Specifically, it is required to increase the rated lifting weight and speed, which makes the dynamic load of crane increase. In addition, because the movement state of crane often changes in the working process, there are many unstable working conditions, such as load lifting and leaving the ground, impact and collision while walking, starting and braking of the trolley, etc. Under these conditions, crane structure will be affected by shock and vibration to varying degrees. In this way, the impact of various dynamic loads on the structure of the crane has to be taken into account in the design of the lifting machinery, and it is necessary to design the lifting machinery by dynamic design method. In this paper, the static and dynamic mechanical properties of the rail container gantry crane are studied. Through statics analysis, the dangerous point of load at the end of beam and beam is determined, and its strength and stiffness are checked, combined with the parameterized finite element model, The modal analysis of the gantry structure of the rail container gantry crane is carried out. The first 10 natural frequencies and vibration patterns are extracted and the results are analyzed. Secondly, the transient analysis of the dynamic load of the rail container gantry crane is carried out. The dynamic response of the rail container gantry crane at the moment of lifting off the ground is obtained, including the response curves of the girder vertical displacement, vertical velocity, vertical acceleration and time. Finally, the dynamic optimization design of the whole machine structure weight is carried out by the method of structural dynamic optimization design. This method not only effectively reduces the weight of the whole machine structure, but also ensures the good static and dynamic performance of the whole machine structure, and achieves the purpose of dynamic optimization design.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH21

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