This study proposed a hybrid actuator combining SMA and DC motor for prosthetic fingers. First, we proposed a mechanism for the hybrid actuator. Second, the characteristics of SMA were detected. Third, the performance of the prosthetic finger driven by the hybrid actuator was computed on the basis of the system model. Finally, we developed a prototype to test the feasibility of the design idea, and grasping reflex experiments were conducted. The experimental results demonstrated that compared with the case when being driven only by the motor actuator, the rate of grasping force increased significantly (approximately 4 times) when being driven by the hybrid actuator. The slipping displacement decreased sharply. Our future study will focus on the control of the hybrid actuator and the use of cooling device to increase the response speed for the consecutive reflex.
This study proposed a hybrid actuator combining SMA and DC motor for prosthetic fingers. First, we proposed a mechanism for the hybrid actuator. Second, the characteristics of SMA were detected. Third, the performance of the prosthetic finger driven by the hybrid actuator was computed on the basis of the system model. Finally, we developed a prototype to test the feasibility of the design idea, and grasping reflex experiments were conducted. The experimental results demonstrated that compared with the case when being driven only by the motor actuator, the rate of grasping force increased significantly (approximately 4 times) when being driven by the hybrid actuator. The slipping displacement decreased sharply. Our future study will focus on the control of the hybrid actuator and the use of cooling device to increase the response speed for the consecutive reflex.
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