共查询到10条相似文献,搜索用时 109 毫秒
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综述了空间并联机构自由度的分析与计算方法,在此基础上具体分析了几种典型的并联机构的自由度.对于特殊的空间并联机构,也介绍了一种确定动平台自由度及其运动类型的方法. 相似文献
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Conventional overconstrained parallel manipulators have been widely studied both in industry and academia, however the structural synthesis of hybrid mechanisms with additional constraints is seldom studied, especially for the four degrees of freedom(DOF) hybrid mechanisms. In order to develop a manipulator with additional constraints, a class of important spatial mechanisms with coupling chains(CCs) whose motion type is two rotations and two translations(2R2T) is presented. Based on screw theory, the combination of different types of limbs which are used to construct parallel mechanisms and coupling chains is proposed. The basic types of the general parallel mechanisms and geometric conditions of the kinematic chains are given using constraint synthesis method. Moreover, the 2R2T motion pattern hybrid mechanisms which are derived by adding coupling chains between different serial kinematic chains(SKCs) of the corresponding parallel mechanisms are presented. According to the constraint analysis of the mechanisms, the movement relationship of the moving platform and the kinematic chains is derived by disassembling the coupling chains. At last, fourteen novel hybrid mechanisms with two or three serial kinematic chains are presented. The proposed novel hybrid mechanisms and construction method enrich the family of the spatial mechanisms and provide an instruction to design more complex hybrid mechanisms. 相似文献
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N重八面体变几何桁架机器人速度、加速度分析 总被引:1,自引:0,他引:1
结合变几何桁架机器人的特点 ,研究了 N重八面体变几何桁架机器人的速度、加速度分析方法 ,导出了 N重八面体变几何桁架机器人速度、加速度分析递推公式 ,提出了末端平台参考点的速度和加速度正解的分析方法 ,为动力学分析打下了基础 相似文献
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四自由度的可实现SCARA型(三平移一转动)输出运动的并联机构,与三自由度的Delta机构相比,因其本身的拓扑结构复杂,导致运动学正解以及动力学计算复杂,从而使其新机型的研究和开发应用相对困难;而降低这些机构的耦合度(简称结构降耦)可直接降低机构运动学、动力学求解的难度。根据笔者提出的机构结构降耦方法,对笔者最近提出的一类5个耦合度值κ为2且具有较好实用价值的SCARA型新型并联机构进行了结构降耦优化,得到了耦合度较低(降为κ=1)但自由度和动平台输出运动类型均保持不变的10个SCARA新机型,而这10个低耦合度(κ=1)机构的运动学正解及动力学正反解,可用一维搜索法方便求得数值解,或从易导出的1个一元高次代数方程求得封闭解,为其进一步构型拓扑优化、设计及应用研究奠定了基础。 相似文献
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提出了一种能够实现三维移动的空间新型三自由度并联机构,其固定平台与运动平台通过对称布置的CU支链相连接.基于该机构运动约束方程,得到位置反解、正解和速度方程的封闭表达式.最后,应用实例验证了理论分析的正确性. 相似文献
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The analysis of degrees of freedom(DOF) of a moving platform is the fundamental problem in kinematics of parallel mechanism. However, many problems should be considered to correctly perform the DOF cal... 相似文献