On Parameter Identification of a Stewart Platform-based Six-component Force/Torque Sensor
WANG Hong-guang1,2, ZHAO Ming-yang1, FANG Li-jin1, ZHANG Bo1, SUI Chun-ping1
1. State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China; 2. Graduate School of the Chinese Academy of Sciences, Beijing 10004
Abstract：This paper presents a large-scale Stewart platform-based six-component force/torque sensor.A force/torque measurement model is established and an optimal objective function based on the inverse kinematics is offered.A novel parameter calibration method,named branch-in-turn calibration,is presented.Based on the developed prototype of the six-component force/torque sensor,experiments have been made.The experimental results show that the branch-in-turn calibration method can effectively identify the structural parameters of the sensor and the measurement accuracy is improved. This method can be applied to parameter calibration of the six-component force/torque sensor with similar structure.
[1] Stewart D.A platform with 6 degrees of freedom[J].Proceedings of the Institution of Mechanical Engineers,1965,180(15):371～386.
[2] Zhuang H,Yan J,Masoty O.Calibration of Stewart platforms and other parallel manipulators by minimizing inverse kinematic residuals[J].Journal of Robotic Systems,1998,15(7):395～405.
[3] Besnard S,Khalil W.Calibration of parallel robots using two inclinometcters[A].Proceedings of the IEEE International Confereuce on Robotics andAutomation[C].Piscataway,NJ,USA:IEEE.1999.1758～1763.
[4] Huang T,Wang J S,Chetwynd D G,et al.Identifiability of geometric parameters of 6-DOF PKM systems using a minimum set of pose error data[A].Proceedings of the IEEE International Conference on Robotics and Automation[C].Piacataway,NJ,USA:IEEE,2003.1863～1868.
[5] 张学功,邹怀武,陈卫东.并联六自由度对接平台运动学标定方法研究[J].宇航学报,2007,28(2):273～277.Zhang Xue-gong,Zou Huai-wu,Cheng Wei-dong.The research of kinematic calibration method of parallel 6-DOF dock platform[J].Journal of Astronautics,2007,28(2):273～277.
[6] Wampler C W,Arai T.Calibration of robots having kinematic closed loops using nonlinear least-squares estimation[A].Proceedings of the IFTOMM World Congress in Mechanism and Machine Science[C].Nagoya,Japan,1992.153～158.
[7] Zhuang H.Self-Calibration of parallel mechanisms with a case study on Stewart platforms[J].IEEE Transactions on Robotics and Automation,1997,13(3):387～397.
[8] 高建设,程丽,赵永生.新型5自由度并联机床运动学自标定研究[J].计算机集成制造系统,2007,13(4):738～743.Gao Ban-she,Cheng Li,Zhao Yong-sheng.Kinetic selfcalibration of novel 5-DOF parallel machine tool[J].Computer Integrated Manufacturing System,2007,13(4):738～743.
[9] Zhuang H.Roth Z S.Method for kinematic calibration of Stewart platforms[J].Journal of Robotic Systems,1993,10(3):391～405.
[10] Masory O,Wang J,Zhuang H.On the accuracy of a Stewart platform.Part Ⅱ.Kinematic calibration and compensation[A].Ptoccedings of the IEEE Intmmtional Conference on Robotics and Automation[C].Piscataway,NJ,USA:IEEE,1993.725～731.
[11] Sui C P,Wang H G,Fang L J,et al.Static measuring model and deadweight compensation of a Stewart platform based force/torque sensor[A].Proceedings of the IEEE/RSJ Intemational Conference on Intelligent Robots and Systems[C].Piscaraway,NJ,USA:IEEE,2006.484～489.
[12] Dwarakanath T A,Bhaumick T K,Venkatesh D.Implementation of Stewart platform based force-torque sonsor[A].Proceedings of the IEEE International Conference on Multisensor Fusion and Integration for Intelligent Systems[C].Piscataway,NJ,USA:IEEE,1999.32～37.
