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This paper presents an active dual-mode twisting actuation mechanism, which is an automatic transmission system based on twisted string actuation. This mechanism produces two different transmission ratios by adjusting the radius of a twisted string. Automatic mode switching between the two transmission ratios is implemented using an active control mechanism. Then, the effect of the proposed mechanism...
We describe the concept and first prototype of a novel mechatronic design of a robotic gripper, which aims at being mounted on a humanoid robot to achieve firm (i.e. locked) and robust grasps. Such grasps could ideally support complex multi-contact motions, such as ladder climbing, or manipulation of complex tools, with energy efficiency. For this purpose, we propose a solution by designing a smart...
In many applications, robots have to bear large loads while moving slowly and also have to move quickly through the air with almost no load. This leads to conflicting requirements for their actuators. Multiple gear ratios, like in a powertrain, address this issue by allowing an effective use of power over a wide range of output speed. However in robotics, as opposed to powertrains, the controlled...
In this paper, Dual Differential Rheological Actuator (DDRA) is discussed. DDRA is an actuator with high performance torque and position control characteristics, in addition to versatile, safe, robust and easily controllable robotic interactions. DDRA's design is based on the use of two magnetorheological (MR) brakes coupled to an EM motor and to the system's output through a dual differential mechanism...
Force information in virtual space is important and often required for tele-operation, training, amusement, design supporting, and other virtual reality systems. The application of passive-type force display and rehabilitation system is desirable for its high safety. However, there are some directions and link positions for which it is difficult to display the force using only passive elements. To...
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