【作者】 侯峰涛；

【导师】 马军星；

【作者基本信息】 长安大学 ， 机械电子工程， 2009， 硕士

【摘要】 擦窗机是一种广泛应用于高层建筑的幕墙清洁及维护的专用设备,是现代高处清洗作业最理想、最安全、高效率、多功能的高空作业设备。在我国,随着高层建筑的增多,擦窗机的应用也越来越广泛。对其安全性,可靠性,经济性也提出更高的要求。然而,目前擦窗机设计中多凭借经验或粗略的手工计算完成,不能全面了解结构应力分布,致使结构设计不尽合理,既造成材料浪费和成本的增加,也为使用埋下了安全隐患。因此,以擦窗机整机作为研究对象,借助有限元方法对其静动态力学性能进行分析,为擦窗机设计,改造及合理使用提供科学的依据具有重要的理论和应用价值。本文首先利用D-H法对擦窗机进行运动学分析,推导出工作点运动方程,为该机作业范围的确定,和后续研究中惯性载荷的计算奠定了基础。选择擦窗机工作中三个危险工况,在深入研究ANSYS有限元分析中铰链自由度耦合处理,多种单元混合建模等技术的基础上,建立CD250型复合折臂式擦窗机整机有限元分析模型,并分别对三个危险工况多种载荷组合作用下擦窗机静变形及应力分布进行了分析。在满足强度和刚度的要求下为该机的改进设计提出了建议。在静力分析的基础上,对该机进行模态分析,得到整机的前五阶固有振动频率及相应的主振型,分析了工作中各种动态载荷对整机振动的影响,为进一步提高该机的动态性能提供了理论依据。更多还原

【Abstract】 As the most ideal, safe, efficient and multifunctional equipment, gondola is widely used in the cleaning and maintenance of glass curtain wall of high-rise buildings. In our country, gonloda is becoming a kind of necessary equipment for high-rise buildings. In the near future, more and more safe, reliable, economic gonlodas are needed with the increase of the high-rise buildings. However, the gondolas are designed to be rough on the manual calculation and the experience. During the design, the distribution of stress in the structure can not be known clearly and fully by engineers. This not only brings in some unreasonable structural, material waste and high manufacturing costs in the product of gonloda, but also causes many security problems. Therefore, it has important theoretical and applied value that the intergration finite element method is used to analyze the static and dynamic mechanical properties of whole gondola and provide a scientific basis for its design.In this dissertation, the kinematics of gondola is analyzed through the D-H method firstly. The motion equations of operating point are derived. These equations provide a theroetical basis for determining the operation range of the gonloda and calculating the inertia loads in further studies.Three dangerous work conditions are selected to study the static mechanical properties of the gondola. Based on study some key techniques of ANSYS, such as simulating hinge by coupled degree of freedoms, modeling complicated construction by mixed elements and so on, the interation finite element analysis model of goose-neck jib gondola CD250 is established. In three dangerous working conditions, the static deformation and stress distribution of the gondola with complex loads are analyzed. Some useful advices are presented for redesign.Modal analysis of the gonloda is also carried out. The first five natural vibration frequencies and corresponding vibration mode of the whole equipment are obtained. The influences of all dynamic working loads on vibration are analyzed. This provides a theoretical basis for improving the dynamic performance of the gonloda.更多还原