Pole Pose Measurement and Autonomous Grasping with a Biped Climbing Robot
HU Jie1, GUAN Yisheng2, WU Pinhong1, SU Manjia2, ZHANG Hong3
1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China;
2. School of Electro-mechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China;
3. Department of Computing Science, University of Alberta, Edmonton T6G2E8, Canada
In order to achieve autonomous grasping of the target pole for a 5 degree of freedom biped climbing robot Climbot with planar structure, a method for pole measurement and autonomous grasping based on a 2D scanning laser range finder (sLRF) is proposed. Firstly, the special pose constraint conditions that Climbot transits from one pole to another are listed according to the planar structure. Then, several central points of the pole are measured with a scanning motion of the sLRF mounted on the swinging gripper. Using these points, the linear equation of the pole is fitted, and the pole pose is obtained. Autonomous grasping motion satisfying the transit constraints is planned based on the linear equation. Finally, the central points' measurement errors are analyzed by experiments, and also the pole pose's angle errors relative to the real pole and the frame of Climbot's end gripper. The errors are acceptable comparing with the pole size and the open size of gripper. It is shown that the proposed method can accurately measure the position of the target pole, and the planned grasping motion is reasonable.
[1] Yashiro K, Koji Y, Kumiko I, et al. Development of tree climbing and pruning robot, Woody-1: Simplification of control using adjust function of grasping power[C]//JSME Conference on Robotics and Mechatronics. Tokyo, Japan: JSME, 2006: 1A1-E08.[2] Tavakoli M, Marjovi A, Marques L, et al. 3DCLIMBER: A climbing robot for inspection of 3D human made structures[C]//IEEE/RSJ International Conference on Intelligent Robots and Systems. Piscataway, USA: IEEE, 2008: 4130-4135.[3] Yoon Y, Rus D. Shady3D: A robot that climbs 3D trusses[C]//IEEE International Conference on Robotics and Automation.Piscataway, USA: IEEE, 2007: 4071-4076.[4] Lam T L, Xu Y. A flexible tree climbing robot: Treebot–design and implementation[C]//IEEE International Conference on Robotics and Automation. Piscataway, USA: IEEE, 2007:5849-5854.[5] Guan Y S, Jiang L, Zhu H F, et al. Climbot: A modularbio-inspired biped climbing robot[C]//IEEE International Conferenceon Intelligent Robots and Systems. Piscataway, USA:IEEE, 2011: 1473-1478.[6] 江励.双手爪模块化仿生攀爬机器人的研究[D].广州:华南理工大学,2012.Jiang L. Development and analysis of a bio-inspired modular biped climbing robot[D]. Guangzhou: South China University of Technology, 2012.[7] Jiang L, Guan Y S, Zhou X, et al. Grasping analysis for a biped climbing robot[C]//IEEE International Conference on Robotics and Biomimetics. Piscataway, USA: IEEE, 2010: 579-584.[8] Lam T L, Xu Y. Treebot: Autonomous tree climbing by tactile sensing[C]//IEEE International Conference on Robotics and Automation. Piscataway, USA: IEEE, 2011: 789-794.[9] Tavakoli M, Marques L, Almeida A T. A low-cost approach forself-calibration of climbing robots[J]. Robotica, 2011, 29(1):23-34. [10] Tavakoli M, Marques L, Almeida A T. Self calibration of stepby-step based climbing robots[C]//International Conference on Intelligent Robots and Systems. Piscataway, USA: IEEE, 2009:3297-3303.[11] Guan Y S, Xiao Z, Wu W, et al. Gripper self-alignment for autonomous pole-grasping with a biped climbing robot[C]//IEEE International Conference on Robotics and Biomimetics. Piscataway,USA: IEEE, 2012: 181-186.[12] 江励,管贻生,蔡传武,等.仿生攀爬机器人的步态分析[J].机械工程学报,2010,46(15): 17-22.Jiang L, Guan Y S, Cai C W, et al. Gait analysis of a novel biomimetic climbing robot[J]. Journal of Mechanical Engineering,2010, 46(15): 17-22.[13] 肖志光.双手爪攀爬机器人自主抓夹的研究[D].广州:华南理工大学,2013.Xiao Z G. Autonomous grasping with a biped climbing robot[D]. Guangzhou: South China University of Technology,2013.