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Design of a New Variable Stiffness Actuator and Application for Assistive exercise control.pdf

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Design of a New Variable Stiffness Actuator and Application for Assistive exercise control

Abstract—Focusing on the physical interaction between people and machines within safety constraints in versatile situations, this paper proposes a new, efficient actuation approach, continuous-state coupled elastic actuation (CCEA), to provide oncoming human-machine systems with an intrinsic programmable stiffness capacity to shape output force corresponding to the deviation between human motions and set positions of the system. As one of all the possible CCEA systems, a prototype of a 2-DOF coupled elastic actuator is designed to provide a compromise between performance and safety. Using a pair of antagonistic four-bar linkages, the inherent stiffness of the system can be adjusted dynamically. Compared to the state-of-the-art variable stiffness actuators, the CCEA system is unique in that it can achieve near zero mechanical stiffness in an efficient way. In addition, a human-robot interaction model is built to investigate the controlled bandwidth and safety of the CCEA system. For the application of assistive exercises, this study also proposes two kinds of controls for assistive exercises. Finally, a CCEA exoskeleton is built for elbow rehabilitation. Both simulations and experiments are conducted to show some desired properties of the proposed CCEA system. I. INTRODUCTION hysical human-robot interaction (pHRI), considering the trade-off between safety and performance, emerges from modern robotics as a focused effort to design robots that are intrinsically safe for human interaction [1]. In particular, several distinguished imperative expectations in the field of pHRI are arising to satisfy long-term requirements and to solve anticipated problems, such as the development of robots as mechanical workers or servers to support human labor or to assist disabled humans with daily activities under labor shortages and longevity problems. To achieve safety and efficiency, one must employ manifold strategies involving all aspects