剪叉式机动平台的设计与结构优化

发布时间：2018-04-17 05:14

本文选题：剪叉式机构 + 机动平台　；参考：《长沙理工大学》2012年硕士论文

【摘要】：剪叉式机构是一类具有鲜明特色的平面连杆机构，由于该机构具有结构简单、伸缩性好、稳定性强等优良特性，因此在工程中得到了广泛的应用，特别应用于升降平台车、伸缩门、支撑架领域中。但由于剪叉式机构缺乏系统的设计理论支持，设计者们难以去挖掘剪叉式机构应有的应用潜力。本论文对剪叉式机构展开理论研究和探讨，并将剪叉式机构运用到机动平台领域。对原有的机动平台进行结构的改进，并针对该机动平台进行了承载能力的分析，并应用有限元软件对其进行了优化设计。主要进行了以下研究工作：研究剪叉式机构不同组合形式，结合机动平台的工作环境特点，对原有机动平台进行修改，加入剪叉式组合机构，得到一种改进后的空间展开式机动平台。对空间展开式机动平台的主要受力构件剪叉臂进行承载能力分析。考虑在实际情况下剪叉臂可能受到的载荷类型有压力、弯矩、风载荷，对剪叉臂在承受不同载荷类型下的强度、刚度以及稳定性进行计算分析，最后再对剪叉臂在承受多种载荷下综合承载能力进行计算分析。分析结果表明，在承受不同载荷情况下，剪叉臂的承载能力是足够的。利用ANSYS有限元分析软件，对剪叉臂以及空间展开机构受力情况进行仿真，得到了剪叉臂和空间展开机构的最大应力、最大变形的大小以及位置，其分析结果也对前面的理论分析结果起到验证性的作用。利用ANSYS强大的优化功能，对空间展开式机动平的主要受力构件进行了结构优化，得到了优化分析结果，大大减小了剪叉臂所承受的最大应力，达到了优化的目的。通过改进后的空间展开式机动平台具有剪叉式机构的优良特性，，可广泛运用于户外作业环境中去。
[Abstract]:The shear fork mechanism is a kind of planar linkage mechanism with distinct characteristics. Because of its simple structure, good flexibility and strong stability, it has been widely used in engineering, especially in lifting platform cars.Telescopic door, support in the field.However, due to the lack of systematic design theory support, it is difficult for designers to tap the application potential of the shear fork mechanism.In this paper, the shear fork mechanism is studied theoretically and applied to the field of mobile platform.The structure of the original mobile platform is improved, and the load-carrying capacity of the platform is analyzed, and the finite element software is used to optimize the design of the platform.The following studies were carried out:In this paper, the different combination forms of shear fork mechanism are studied. According to the working environment characteristics of the mobile platform, the original mobile platform is modified, and the shear fork type combination mechanism is added to obtain an improved spatial expansion maneuvering platform.The load-carrying capacity of the shear-fork arm, which is the main force member of the space expansion mobile platform, is analyzed.Considering the load types such as pressure, bending moment and wind load, the strength, stiffness and stability of the shear fork arm under different load types are calculated and analyzed.Finally, the comprehensive load-bearing capacity of the shear-fork arm under various loads is calculated and analyzed.The results show that the bearing capacity of the shear arm is sufficient under different loads.By using ANSYS finite element analysis software, the stress of the shear fork arm and the spatial expansion mechanism is simulated, and the maximum stress, the maximum deformation and the position of the shear fork arm and the spatial expansion mechanism are obtained.The analysis results also play a validating role to the previous theoretical analysis results.By using the powerful optimization function of ANSYS, the structural optimization of the main force components of the spatial expansion maneuvering plane is carried out, and the results of optimization analysis are obtained, which greatly reduce the maximum stress of the shear fork arm and achieve the purpose of optimization.The improved spatial expansion maneuvering platform has the excellent characteristics of shear fork mechanism and can be widely used in outdoor working environment.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH112

【引证文献】