Design and experimental study of a passive power-source-free stiffness-self-adjustable mechanism
Yuwang LIU, Dongqi WANG, Shangkui YANG, Jinguo LIU, Guangbo HAO
Design and experimental study of a passive power-source-free stiffness-self-adjustable mechanism
Passive variable stiffness joints have unique advantages over active variable stiffness joints and are currently eliciting increased attention. Existing passive variable stiffness joints rely mainly on sensors and special control algorithms, resulting in a bandwidth-limited response speed of the joint. We propose a new passive power-source-free stiffness-self-adjustable mechanism that can be used as the elbow joint of a robot arm. The new mechanism does not require special stiffness regulating motors or sensors and can realize large-range self-adaptive adjustment of stiffness in a purely mechanical manner. The variable stiffness mechanism can automatically adjust joint stiffness in accordance with the magnitude of the payload, and this adjustment is a successful imitation of the stiffness adjustment characteristics of the human elbow. The response speed is high because sensors and control algorithms are not needed. The variable stiffness principle is explained, and the design of the variable stiffness mechanism is analyzed. A prototype is fabricated, and the associated hardware is set up to validate the analytical stiffness model and design experimentally.
variable stiffness mechanism / stiffness self-regulation / bionic robot / modeling
[1] |
Ding H, Yang X, Zheng N,
CrossRef
Google scholar
|
[2] |
Hirzinger G, Bals J, Otter M,
|
[3] |
Ham V R, Sugar T G, Vanderborght B,
CrossRef
Google scholar
|
[4] |
Vanderborght B, Albu-Schaeffer A, Bicchi A,
CrossRef
Google scholar
|
[5] |
Tagliamonte N L, Sergi F, Accoto D,
CrossRef
Google scholar
|
[6] |
Wolf S, Grioli G, Eiberger O,
CrossRef
Google scholar
|
[7] |
Pratt G A, Williamson M M. Series elastic actuators. In: Proceedings of International Conference on Intelligent Robots and Systems. Human Robot Interaction and Cooperative Robots. Pittsburgh: IEEE, 1995, 399
CrossRef
Google scholar
|
[8] |
Wolf S, Eiberger O, Hirzinger G. The DLR FSJ: Energy based design of a variable stiffness joint. In: Proceedings of IEEE International Conference on Robotics and Automation. Shanghai: IEEE, 2011, 5082–5089
CrossRef
Google scholar
|
[9] |
Jafari A, Tsagarakis N, Caldwell D. Energy efficient actuators with adjustable stiffness: A review on AwAS, AwAS-II and CompACT VSA changing stiffness based on lever mechanism. Industrial Robot, 2015, 42(3): 242–251
CrossRef
Google scholar
|
[10] |
Yigit C B, Bayraktar E, Boyraz P. Low-cost variable stiffness joint design using translational variable radius pulleys. Mechanism and Machine Theory, 2018, 130: 203–219
CrossRef
Google scholar
|
[11] |
Edsinger A L. Robot manipulation in human environments. Dissertation for the Doctoral Degree. Boston: Massachusetts Institute of Technology, 2007, 102–109
|
[12] |
Morita T, Iwata H, Sugano S. Development of human symbiotic robot: WENDY. In: Proceedings of IEEE International Conference on Robotics and Automation. Detroit: IEEE, 1999, 3183–3188
CrossRef
Google scholar
|
[13] |
Tsagarakis N G, Li Z, Saglia J. The design of the lower body of the compliant humanoid robot ‘cCub’. In: Proceedings of IEEE International Conference on Robotics and Automation. Shanghai: IEEE, 2011, 2035–2040
CrossRef
Google scholar
|
[14] |
Malosio M, Spagnuolo G, Prini A,
CrossRef
Google scholar
|
[15] |
Hurst J W, Chestnutt J E, Rizzi A A. The actuator with mechanically adjustable series compliance. IEEE Transactions on Robotics, 2010, 26(4): 597–606
CrossRef
Google scholar
|
[16] |
Eiberger O, Haddadin S, Weis M. On joint design with intrinsic variable compliance: Derivation of the DLR QA-Joint. In: Proceedings of IEEE International Conference on Robotics and Automation. Anchorage: IEEE, 2010, 1687–1694 doi:10.1109/ROBOT.2010.5509662
|
[17] |
Friedl W, Höppner H, Petit F. Wrist and forearm rotation of the DLR Hand Arm System: Mechanical design, shape analysis and experimental validation. In: Proceedings of International Conference on Intelligent Robots and Systems. San Francisco: IEEE, 2011, 1836–1842
CrossRef
Google scholar
|
[18] |
Wolf S, Hirzinger G. A new variable stiffness design: Matching requirements of the next robot generation. In: Proceedings of IEEE International Conference on Robotics and Automation. Pasadena: IEEE, 2008, 1741–1746
CrossRef
Google scholar
|
[19] |
Jafari A, Tsagarakis N G, Sardellitti I,
CrossRef
Google scholar
|
[20] |
Kim B S, Song J B. Design and control of a variable stiffness actuator based on adjustable moment arm. IEEE Transactions on Robotics, 2015, 28(5): 1145–1151
CrossRef
Google scholar
|
[21] |
Groothuis S S, Rusticelli G, Zucchelli A,
CrossRef
Google scholar
|
[22] |
Van Ham R, Vanderborght B, Van Damme M,
CrossRef
Google scholar
|
[23] |
Vanderborght B, Tsagarakis N G, Semini C,
CrossRef
Google scholar
|
[24] |
Fang L, Wang Y. Study on the stiffness property of a variable stiffness joint using a leaf spring. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2018, 1989–1996: 203–210
|
[25] |
Bi S S, Liu C, Zhao H Z,
CrossRef
Google scholar
|
[26] |
Liu L, Leonhardt S, Misgeld B J E. Design and control of a mechanical rotary variable impedance actuator. Mechatronics, 2016, 39: 226–236
CrossRef
Google scholar
|
[27] |
Wang W, Fu X, Li Y,
CrossRef
Google scholar
|
[28] |
Choi J, Hong S, Lee W,
CrossRef
Google scholar
|
[29] |
Tao Y, Wang T, Wang Y,
CrossRef
Google scholar
|
[30] |
Liu Y, Liu X, Yuan Z,
CrossRef
Google scholar
|
[31] |
Shadmehr R, Arbib M A. A mathematical analysis of the force-stiffness characteristics of muscles in control of a single joint system. Biological Cybernetics, 1992, 66(6): 463–477
CrossRef
Google scholar
|
[32] |
Chang H, Kim S J, Kim J. Feedforward motion control with a variable stiffness actuator inspired by muscle cross-bridge kinematics. IEEE Transactions on Robotics, 2019, 35(3): 747–760
CrossRef
Google scholar
|
[33] |
Mata A S, Torras A B, Carrillo J A C. Fundamentals of Machine Theory and Mechanisms. Cham: Springer, 2016
CrossRef
Google scholar
|
/
〈 | 〉 |