Kinematic Analysis and Design Optimization for a Reduced-DoF Quadruped Robot with Minimal Torque Requirements

With a unique kinematic arrangement, a new type of quadruped robot with reduced degrees of freedom (DoF) requires minimal-torque actuators to achieve high-payload locomotion. This paper focuses on the kinematic analysis and design optimization for robots of this type. To plan and control its change of posture, a necessary strategy to find feasible solutions of full-body inverse kinematics under additional kinematic constraints is introduced. A design method via nonlinear programming (NLP) is first presented in order to optimize link parameters with guarantee to a series of successive steps. Workspace is also investigated to prepare for further dynamic motion planning. We have verified feasibility of proposed methods with software simulations and hardware implementations, e.g., omni-directional walking and situ rotation.

[1]  Kan Yoneda,et al.  Light Weight Quadruped with Nine Actuators , 2007, J. Robotics Mechatronics.

[2]  Clément Gosselin,et al.  Workspaces of Planar Parallel Manipulators , 1998 .

[3]  Jun Wu,et al.  Performance comparison of three planar 3-DOF parallel manipulators with 4-RRR, 3-RRR and 2-RRR structures , 2010 .

[4]  Martin Buehler,et al.  SCOUT: a simple quadruped that walks, climbs, and runs , 1998, Proceedings. 1998 IEEE International Conference on Robotics and Automation (Cat. No.98CH36146).

[5]  Sangbae Kim,et al.  MIT Cheetah 3: Design and Control of a Robust, Dynamic Quadruped Robot , 2018, 2018 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS).

[6]  Daniel E. Koditschek,et al.  Design Principles for a Family of Direct-Drive Legged Robots , 2016, IEEE Robotics and Automation Letters.

[7]  Shigeo Hirose,et al.  Construction of a quadruped with reduced degrees of freedom , 2000, 2000 26th Annual Conference of the IEEE Industrial Electronics Society. IECON 2000. 2000 IEEE International Conference on Industrial Electronics, Control and Instrumentation. 21st Century Technologies.

[8]  Christopher G. Atkeson,et al.  Optimization and learning for rough terrain legged locomotion , 2011, Int. J. Robotics Res..

[9]  Peter Fankhauser,et al.  ANYmal - a highly mobile and dynamic quadrupedal robot , 2016, 2016 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS).

[10]  J. Denavit,et al.  A kinematic notation for lower pair mechanisms based on matrices , 1955 .

[11]  Daniel E. Koditschek,et al.  RHex: A Simple and Highly Mobile Hexapod Robot , 2001, Int. J. Robotics Res..

[12]  Jun Wu,et al.  Parameter design and manufacture for the 4RRR parallel manipulator , 2011, Proceedings of 2011 International Conference on Electronic & Mechanical Engineering and Information Technology.

[13]  Albert Wang,et al.  Proprioceptive Actuator Design in the MIT Cheetah: Impact Mitigation and High-Bandwidth Physical Interaction for Dynamic Legged Robots , 2017, IEEE Transactions on Robotics.

[14]  Pei-Chun Lin,et al.  Design of a leg-wheel hybrid mobile platform , 2009, 2009 IEEE/RSJ International Conference on Intelligent Robots and Systems.