摘要
为了使机器人的超声探头能够紧密贴合被检管道表面,设计了一种被动柔顺性末端执行器,并提出了一种被动关节与主动关节分离的外环混合位置/力控制策略,进行了位置/力控制仿真。确定了被动柔顺性末端执行器微动位置调整与主动关节输出变量之间求解关系,建立了理想状态下的准静态力学控制模型,理论上证明了位置偏差和力偏差均可通过主动关节的控制得到有效消除,保证控制精度。仿真研究了分度角分别为0、30°、60°与90°所对应的圆、椭圆及直线的截面线轨迹扫查情况。结果表明在各种情况下的位置与力控制都收敛并满足精度要求,从而证明了所提出的被动柔顺关节外环位置/力控制策略是有效的。
A passive compliance end actuator was designed to enable a robot＇s ultrasonic wave detector to touch tested tube surfaces tightly, an out-loop position/force mixture control strategy which isolates the robot＇s passive joints from its active joints was presented, and its position/force control simulation was made. The relationship between micro-motion position adjustment of the passive compliance end actuator and output variables of active joints was determined. Quasi-static mechanical model in its ideal status was created. Theoretically, errors of position and force can be erased through the control of active joints. Scan paths for section lines of circle, ellipse and line with graduation in degrees 0, 30°, 60° and 90°were studied by simulation. The simulation demonstrated that the position/force control algorithm was astringent in all cases and met high precision requirements, which proved tiffs out-loop position/force control method for passive flexible joints was effective.
出处
《机械科学与技术》
CSCD
北大核心
2006年第3期253-256,共4页
Mechanical Science and Technology for Aerospace Engineering
基金
国家"863"高技术研究发展计划项目(2002AA442110)资助
关键词
管道焊缝检查
机器人
被动柔顺性
位置/力混合控制
仿真
tube welded seam scanning
robot
passive compliance
position/force mixture control
simulation
