Design and implementation of robot serial integrated rotary joint with safety compliance

Abstract

In order to guarantee safety and stability during physical human-robot-interaction (pHRI) in the occasion of service or industrial operation, a serial integrated rotary joint with the characteristics of passive and active compliance is proposed. Passive compliance is achieved by a designed elastic element, such that the compliant joint may minimize large force which occurs during accidental impacts and, further, may offer more accurate and stable force control and a capacity for energy storage. Meanwhile, the modeling of the compliant joint is comprehensively analyzed, including the effect of the motor model on the overall control system. In order to realize the active compliance, a new method of impedance control is proposed. On the basis of PD control, a more compliant impedance controller is introduced. Experimental results show that the serial integrated rotary joint can provide more effective safety compliance during physical interaction, which has also been well applied in our designed massage robot and rehabilitation robot.

Keywords

elastic element / impedance control / safety compliance / active compliance / serial integrated rotary joint

References

[1] HamR V, SugaeT G, VanderborghtB, HollanderK W. Compliant actuator designs [J]. IEEE Robotics & Automation Magazine, 2009, 16(3): 81-94

[2] PrattG A, WilliamsonM M. Series elastic actuators [C]//. Proceedings of the IEEE/RSJ International Conference on Intelligent Robots and Systems, 1995399406

[3] SensingerJ W, WeirR F. Design and analysis of a nonbackdrivable series elastic actuator [C]//. Proceedings of the 2005 IEEE 9th International Conference on Rehabilitation Robotics, 2005, Chicago, IL, USA, IEEE: 390393

[4] HutterM, RemyC D, HoepflingerM A, SiegwartR. ScarlETH: Design and control of a planar running robot [C]//. 2011 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2011, 10(1): 562-567

[5] KongK, BaeJ, TomizukaM. A compact rotary series elastic actuator for knee joint assistive system [C]//. IEEE International Conference on Robotics and Automation, 201029402945

[6] GrebensteinM, SchafferA A, BahlsT, ChalonM, EibergerO, FriedlW, GruberR, HaddadinS, HagnU, HaslingerR, HoppnerH, JorgS, NicklM, NothhelferA, PetitF, ReillJ, SeitzN, WimbockT, WolfS, WusthoffT, HirzingerG. The DLR hand arm system [C]//. IEEE International Conference on Robotics and Automation, 201131753128

[7] TsagarakisN G, MettaG, SandiniG, TsagarakisN G, MettaG, SandiniG, VernonD, BeiraR, BecchiF, RighettiL, Santos-VictorJ, IjspeertA J, CarrozzaM C, CaldwellD G. iCub: The design and realization of an open humanoid platform for cognitive and neuroscience research [J]. Advanced Robotics, 2007, 21(10): 1151-1175

[8] DEYLE T. Meka robotics’ humanoid torso and anthropomorphic hands [EB/OL]. [2009-10-18]. http://www.hizook.com/blog/2009/10/18/meka-robotics-humanoid-torso-and-anthropomorphic-hands.

[9] Brooks R. Overview of the Cog project—The motivation behind creating Cog is the hypothesis that: Humanoid intelligence requires humanoid interactions with the world [EB/OL]. [1996-08-05]. http://www.ai.mit.edu/projects/cog/OverviewOfCog/cog_overview.html.

[10] LovchikC, DiftlerM. The robonaut hand: A dexterous robot hand for space [C]//. Proceedings of the IEEE International Conference on Automation and Robotics, 1999907912

[11] ObergE, MccauleyC J, HealdRMachinery’s handbook [M], 2000, New York, Industrial Press, Inc.

[12] KangC G, LeeB J, SonI X, KimH Y. Design of a percussive massage robot tapping human backs [C]//. Proc 16th IEEE International Conference on Robot & Human Interactive Communication, 2007962967

[13] JayenderJ, PatelR V, NikumbS, OstojiM. Modeling and control of shape memory alloy actuator [J]. IEEE Transactions Control System Technology, 2008, 16(2): 279-287

[14] PughARobot sensors: International trends in manufacturing technology [M], 1986, UK, IFS Publication Ltd

[15] RobertsR KThe compliance of end effect or force sensors for robot manipulator control [D], 1984, West Lafayette, Purdue University

[16] PrattJ EVirtual model control of a biped walking robot [R], 1995, Cambridge, MIT Artificial Intelligence Laboratory

[17] SensingerJ W, WeirR F. Improved torque ripple turning in harmonic drives through the union of two existing strategies [J]. IEEE Transactions on Mechatronics, 2006, 11(4): 457-461

[18] SulzerJ, PeshkinM, PattonJ. MARIONET: An exotendondriven, rotary series elastic actuator for exerting joint torque [C]//. International Conference on Robotics for Rehabilitation, 2005103108

[19] BlayaJ A, HerrH. Adaptive control of a variable-impedance ankle-foot orthosis to assist drop-foot gait [J]. IEEE Transactions on Neural Systems and Rehabilitation Engineering, 2004, 12(1): 24-31

[20] PrattJ, KruppB, MorseC. Series elastic actuators for high fidelity force control [J]. Industrial Robot: An International Journal, 2002, 29(3): 234-241

[21] RobinsonD W, PrattJ E, PaluskaD J, PrattG A. Series elastic actuator development for a biomimetic walking robot [C]//. IEEE/ASME International Conference on Advanced Intelligent Mechatronics, 1999561568

[22] HuangY-c, RanC-j, LiJ, LiG-dong. Integrated rotary compliant joint and its impedance-based controller for single-joint pressing massage robot [C]//. IEEE International Conference on Robotics & Biomimetics, 201219621967

[23] LiuX-d, YuY, LiZ, HerbertH C I. Polytopic H_℞ filter design and relaxation for nonlinear systems via tensor product technique [J]. Signal Processing, 2016, 127: 191-205

[24] JuZ-f, YangC-g, MaH-bin. Kinematics modeling and experimental verification of baxter robot [C]//. Proceedings of the 33rd Chinese Control Conference, 2014, Nanjing, China, CCC: 85188523