抓斗挖泥船作业动态特性研究

发布时间：2018-01-20 09:53

本文关键词： 抓斗挖泥船刚柔耦合流体仿真动力学仿真　出处：《大连理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：抓斗挖泥船是一种重要的疏浚设备,广泛应用于港口、航道的建设和维护以及国防建设、农田水利等工程中。随着疏浚市场规模的不断增长,我国对抓斗挖泥船的需求量也越来越大。但目前国内在抓斗挖泥船的自主设计建造及使用等环节还存在许多问题,特别是在抓斗挖泥船作业过程中的载荷计算方面缺少参考依据,很多情况下仍然依靠经验公式进行估算,很难保证所得结果的合理性和准确性。抓斗挖泥船在作业过程中运行状态变化频繁,因为惯性力和冲击作用的存在,结构中将会产生动载荷,而动载荷的大小对挖泥船的设计计算和安全操作都具有重要意义。另外由于抓斗是在水中作业,不同于陆上起重设备,需要考虑水的作用力的影响。目前国内外缺少对抓斗挖泥船作业过程中动态特性的相关研究,为此,本文以18m3抓斗挖泥船为研究对象,对其作业过程动态特性进行研究,具体内容如下：(1)梳理总结了进行机械系统动力学仿真和流体力学仿真所需的基础理论,为仿真计算的顺利完成做好了前提准备。(2)根据抓斗挖泥船船体、转台和臂架等各部件特点,借助于Pro/E、ANSY和ADAMS等软件建立了其整机刚柔耦合模型,特别是对挖泥船绳索系统建模方法做了新的尝试,实现了绳索系统的快速参数化建模。(3)借助ANSYS Workbench平台下的Fluent软件,对挖泥船抓斗进行了流体力学仿真计算,求得了抓斗在水中运动时所受阻力大小,并研究了阻力值与相对运动速度的关系。(4)考虑抓斗挖泥船水中作业的载荷特性,将流体力学仿真结果加载到抓斗挖泥船动力学模型上,在ADAMS中对抓斗挖泥船进行了动力学仿真,研究了不同起升及回转工况下臂架动载荷及载荷特点,为抓斗挖泥船的结构设计及安全操作提供参考。
[Abstract]:Grab dredger is an important dredging equipment, which is widely used in port, waterway construction and maintenance, national defense construction, irrigation and water conservancy and other projects. The demand for grab dredger is increasing in our country, but there are still many problems in the design, construction and use of grab dredger in our country. Especially in the grab dredger operation in the process of load calculation lack of reference basis, in many cases still rely on empirical formula to estimate. It is difficult to ensure the rationality and accuracy of the obtained results. The operation state of the grab dredger changes frequently during the operation, because of the existence of inertia force and impact, the dynamic load will be produced in the structure. The size of the dynamic load is of great significance to the design calculation and safe operation of dredger. In addition because the grab is working in water it is different from the land lifting equipment. It is necessary to consider the influence of water force. At present, there is a lack of research on the dynamic characteristics of grab dredger at home and abroad. Therefore, this paper takes 18 m3 grab dredger as the research object. The dynamic characteristics of the operation process are studied. The detailed contents are as follows: 1) the basic theory of mechanical system dynamics simulation and hydrodynamics simulation is summarized. For the successful completion of the simulation calculation, the premise preparation is made. 2) according to the characteristics of grab dredger hull, turntable and arm frame, Pro/E is used. Software such as ANSY and ADAMS have established the rigid-flexible coupling model of the whole machine, especially the modeling method of the dredger rope system has made a new attempt. The fast parameterized modeling of rope system is realized. With the help of Fluent software based on ANSYS Workbench, the hydrodynamic simulation calculation of dredger grab is carried out. The magnitude of resistance of grab bucket in water motion is obtained, and the relation between resistance value and relative moving velocity is studied. 4) the load characteristics of grab dredger working in water are considered. The hydrodynamic simulation results are loaded into the dynamic model of grab dredger. The dynamic simulation of grab dredger is carried out in ADAMS, and the dynamic load and load characteristics of boom under different lifting and rotating conditions are studied. It provides reference for the structure design and safe operation of grab dredger.
【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】：U674.31

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