2PRC-PRS并联平台运动学分析与控制系统开发  

Kinematic analysis of 2PRC-PRS parallel platform and development of control system

作　　者：韩博[1] 许允斗[1,2] 姚建涛[1,2] 苏弘良 平立发 赵永生[1,2] 

机构地区：[1]燕山大学河北省并联机器人与机电系统实验室,秦皇岛066004 [2]燕山大学先进锻压成形技术与科学教育部重点实验室,秦皇岛066004

出　　处：《农业工程学报》2016年第14期30-38,共9页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(51275439和51405425);河北省重点基础研究项目(15961805D);燕山大学青年教师自主研究计划课题(13LGA001)

摘　　要：为拓展少自由度并联机器人在农业工程中的应用,提出一种具有两转一移(2R1T)3自由度的2PRC-PRS并联机构,基于反螺旋理论对机构的自由度及运动特性进行了分析,并推导出了机构的位置反解;设计制造了2PRC-PRS并联平台样机,结合贝加莱公司生产的伺服运动控制器,添加相应外围设备,对并联平台设计了一套基于Powerlink总线的网络化运动控制系统,组装了电控柜,并以Automation Studio 3.0为软件开发平台,基于ST编程语言开发了控制软件;在并联平台和电控柜以及控制软件的基础上,完成了伺服电机三环参数整定、电子齿轮试验、平台综合运动控制试验以及无线网络远程控制试验。为深入研究此类少自由度并联机器人奠定了理论和试验基础,丰富了工业网络实时控制系统的实践经验,也为此类机电一体化设备的研发提供了参考。Agricultural engineering operations are often conducted in complex ground conditions such as fields on a hill, forest land, and hilly land. Compared with 6 degrees of freedom（DOFs） parallel robot, lower-mobility parallel robot is especially suitable for picking, planting and transporting crops in complex ground conditions with the advantages of fewer actuators, fewer components, easy control, easy fabrication, low cost, and so on. One translational and two rotational DOFs parallel mechanism is a representative of lower-mobility parallel robot. In order to expand the application of lower-mobility parallel robot in agriculture, this paper presented a novel 2PRC-PRS parallel mechanism, which has one translational DOF and two rotational DOFs. The motion characteristics of the mechanism and its number of DOFs were analyzed based on the theory of reciprocal screw, and through establishing the moving coordinate system and the fixed coordinate system of the parallel platform, the kinematic screw system of each branch and the corresponding constraint wrenches were calculated, the reciprocal kinematic screws of the constraint wrenches of each branch were solved, and then the DOF nature of the moving platform was analyzed based on the kinematic screws of the moving platform. It concluded that the moving platform had 3 DOFs, which were respectively the movement along the vertical direction and the rotations along the two directions which are perpendicular in the horizontal plane. After analyzing the number of DOFs and the motion characteristics of the 2PRC-PRS parallel mechanism, whether the DOF of the moving platform was instantaneous or not was checked. The results showed that the DOF of the 2PRC-PRS parallel mechanism was not instantaneous, and it was continuous. By adopting Z-X-Y Euler angle to describe posture and position of the parallel platform, the inverse position of the parallel platform was calculated. The model machine of the 2PRC-PRS parallel platform was designed and manufactured; combined with the servo m

关 键 词：并联 机构 软件开发 螺旋理论 位置反解 控制系统 网络远程控制 

分 类 号：TP242[自动化与计算机技术—检测技术与自动化装置]