A geometric approach to solving the stable workspace of quadruped bionic robot with hand–foot-integrated function

This paper discusses stable workspace of a hand–foot-integrated quadruped walking robot, which is an important issue for stable operation of the robot. This robot was provided with combined structure of parallel and serial mechanisms, whose stable workspace was the subspace of the workspace in which the system was considered stable. The reachable region was formed under structural conditions, while the stable space was formed by the overall conditions of stability which changed with the robot's pose and the mass of grabbed object. In this paper, based on the robot's main structure, the key issues in solving the robot's workspace are discussed in detail, including searching steady conditions of operation of the robot. To research the robot's workspace, working leg's motion curve needed to be solved by kinematics analysis. Due to the redundant drive, it was problematic to deal analytically with the kinematics of the quadruped walking robot. A geometric method of kinematic analysis was proposed as well. Based on the geometric method, the workspace of the robot under varying postures was analyzed by the method of grid partition and in combination with Matlab, VB and Solidworks software programs. An automated computational system of the stable workspace was developed and an example was given to illustrate the whole process in detail. The theory and analysis procedures were also verified by simulation of the robot and its actual grabbing of an object.     

曲面上CRS机器人的极值轨道

为了解决曲面上移动CRS机器人的路径规划问题,在曲面上建立了机器人的动态模型,利用微分几何的李群理论和庞特里亚金最大值原理,证明了曲面上CRS机器人是可控的,并给出了机器人的最小时间控制的必要条件和结构方程.指出速度控制变量和角速度控制变量完全由结构方程和曲面的高斯曲率决定.通过对结构方程的分析,得到机器人的极值轨道由5种基本轨道的有限组合而成,这5种基本轨道是以单位速度向前(后)移动,并且还给出了这5种基本轨道角速度变化的具体分布情况.     

人行激励荷载作用机理的试验研究

人行激励荷载引发的结构振动可能导致结构使用舒适性问题.利用识别的单步荷载落足曲线建立连续步行激励荷载时程曲线用于人行桥人致振动响应分析过程中,对于人行桥人致振动使用舒适性问题研究具有重要意义.利用多维测力台数据采集和分析系统进行行人步行过程中荷载数据采集工作,然后通过关键点荷载值多项式插值方式识别出六类人行荷载模式的落足曲线,对比了各种荷载模式下的单步落足曲线,最后建立了人行荷载峰值与步频间的具体函数关系式,给出了相应的拟合曲线.     

基于刚柔混合建模的移动焊接机器人系统仿真

以某移动焊接机器人为例,在刚柔混合建模理论与方法的基础上,利用Pro/E对移动焊接机器人进行整体造型;不仅将模型导入到仿真软件ADAMS环境,而且利用ADAMS/AutoFlex模块对机器人部分构件建立柔性体,同时通过ADAMS/View构建了机器人的刚柔多体动态仿真模型。仿真分析说明：该模型能够准确的反映焊接机器人的运动和受力情况,其分析也为末端机械手的动力学研究和移动焊接机器人物理样机的开发提供可靠的方法和依据。     

转向盘式全方位六足机器人运动分析及控制

提出了一种腿式机器人与转向盘复合的全方位步行机构,介绍了其独特的运动特点和转向性能;为了实现对其良好的运动控制,建立了该步行机器人转向机构在运动过程中的等效机构模型,采用拉格朗日力学法推导出操作臂的动力学方程;通过对样机模型的运动规划和实验研究,证明了转向盘式全方位机器人具有简单灵活、精确的方向可操控性。     

CAN总线在移动机器人中的应用

移动机器人多路超声波传感器分别与中央处理器连接存在着数据线过多、中央处理器负担过重的问题．因此提出了基于CAN（Controller Area Network）总线的测距系统,设计了机器人的超声波测距系统的CAN总线硬件节点和软件结构,包括SJA1000CAN控制器及其初始化,CAN控制器数据接收程序和CAN控制器数据发送程序,并且讨论了数据发送过程。