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The Time Domain Passivity Control Approach is gathering interest in the robotics field. Simplicity and flexibility and the fact that system design emerges from ideal cases make it a powerful stability tool for teleoperation systems. Communication time delay is an inherent attribute of nearly every realistic teleoperation system. Unless the communication channel guarantees transmission delays of less...
A three-channel bilateral control system which is hybrid of position control and force control in the acceleration dimension based on disturbance observer gets unstable in contact with environments under time delay. In this control system, the sum of master force and slave force is controlled to zero in common modal space to realize the law of action-reaction. This paper proposes a velocity damping...
Time delay in bilateral control system seriously deteriorates the performance and stability. A time delay compensation method based on the concept of network disturbance (ND) and communication disturbance obsrver (CDOB) has been proposed and the validity has been verified so far. Time delay compensation by CDOB improves the ??Operationality?? of master robot but simultaneously deteriorates ??Reproducibility??...
This paper introduces a method to realize multilateral teleoperation(multi operator/multi robot teleoperation) under time delay. This method provides stability regardless of the size of the delay and good performance including force feedback. We first introduce the four channel based multilateral control scheme to realize multilateral teleoperation and show using small gain theorem that as in traditional...
This paper analyses the L2 stability of four channel teleoperation systems under time delay. It is a well known fact that four channel architecture provides the best performance when no delay is present on the communication channels. However when delay is present four channel systems can not guarantee stability or good performance. The L2 analysis we present using small gain theorem indeed confirms...
The paper addresses the controller design problem for a class of teleoperation systems. The forward and the backward transmission time delays are time-varying and asymmetric. The velocities of the master and slave joints are not available and the precise mathematical robot models are also not known. For dealing with the control problem, we first design a high gain observer to estimate the velocities...
Previous efforts in bilateral time-delay teleoperation have mainly yielded control algorithms that sacrifice performance in order to guarantee robust stability. This paper proposes a provably stable adaptive predictive controller for teleoperation systems with communication delay. The method uses the model and delay information and can adapt to uncertainties in user and environment dynamics in order...
This paper discusses the problem of time delayed control system with communication disturbance observer (CDOB) when the system suffers large external force. This method is based on the concept of network disturbance that consider the effect of time delay as a disturbance in acceleration dimension. CDOB estimate the effect of time delay to the system and using the estimation result compensate it. In...
Wave variables approach is mostly used due to its conservation to keeping passivity in time delayed teleoperation. On the other hand, excess conservation of passivity results in degraded system performance on environment perception or positional maneuverability. In physical environments waves are reflected, diffracted and refracted. Thus, wave variables approach introduces drifting problem to control...
In this paper, creation of a new network model entitled as infinite mode networks is explained. Infinite mode networks intelligently governs any kind of systems by analyzing multi inputs and exerting multi outputs. They have a desired embedded internal function which roughly determines a route for the whole system to follow as a DNA does for biological systems. By this system, infinitely many error...
In this article, an Internet-based remote control system is designed and implemented. The communication is based on the master-slave structure. The master PC communicates with the slave from about 40 km away by UDP protocol. In order to guarantee the master and slave clocks to be synchronized, the NTP (network time protocol) is used in both sides. The packets are sent together with time-stamps. The...
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