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Sampling periods in digital control systems have been shortened thanks to the development of both hardware and software technologies. In recent years, FPGA (Field Programmable Gate Array) has been applied to robot systems to achieve hard real-time system with short sampling periods. Due to the short sampling periods, the effect of the time quantization has been reduced. Some other hardware restrictions,...
This paper proposes a novel structure of time delayed control systems with communication disturbance observer (CDOB). Time delay problem is one of difficult issues in control engineering and the effects seriously induces performance deterioration and destabilization. Therefore, many kinds of time delay compensation methods or stabilization methods have been proposed so far. As one of those methods,...
In this paper, haptic consensus is introduced for networked robotics; specifically teleoperation systems. Haptic consensus basically employs distributed consensus algorithms, forcing the networked robots to agree on system states such as position, acceleration and force. Once the systems agree on these states they have a haptic coupling. Any force applied on one robot is felt by others and they can...
Time delay in bilateral teleoperation systems is inevitable and very serious problem. It possibly destabilize systems and deteriorates the performance of systems. Many researches about time delay in bilateral teleoperation systems have been proposed so far. In such a situation, authors have proposed a time delay compensation method based on the concept of network disturbance (ND) and communication...
Bilateral teleoperation has been needed in many scenes such as space activities or undersea, work on a atomic power plant and minimally invasive surgery, etc. In bilateral teleoperation, transfer of keen tactile sense as if the operator directly touch the environment without using the robot is required. Wide frequency bandwidth of force sensing is required to achieve transfer of a keen tactile sensation...
This research focuses on improvement of disturbance suppression even under existence of observation noise. Disturbance observer is an effective tool to estimate and compensate disturbance. There is a problem, however, that it cannot accomplish desired disturbance suppression when a large observation noise exists. In this research, a method with which influence of disturbance can be suppressed greatly...
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