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This paper presents an energy bounding approach (EBA) to enhance directional transparency while guaranteeing stability for multiple degree-of-freedom (DOF) haptic interaction. It was observed that the passivity condition for multiple ports may lead to some oscillations in some coordinate directions even though total energy is positive. The passivity condition, therefore, needs to be applied to each...
Several causes of instabilities in the interaction of users with actively controlled haptic devices, notably sampling effects, sensor quantization, and hardware nonlinearities, have been identified and analyzed in prior work. However, certain instabilities may occur that cannot be attributed to these hardware limitations. The problem becomes acute when rendering passive virtual environments which...
In this paper, we analyze the stability robustness of teleoperation systems, coupled to operators and environments with finite range of dynamic variations. A new graphical extension of the scattering-based absolute stability method [5] is proposed, which incorporates minimum inherent damping of the operator as well as bounds on the environment impedance. The proposed method provides both mathematical...
Haptic assistance functions for a telepresence system are presented and assessed. These assistance functions are based on the augmentation of exchanged position and force data, and they are intended to increase the transparency of the telepresence system while maintaining stability. We present the concept and implementation of different assistance functions. Furthermore, we show the setup and results...
In telepresence and teleaction systems the haptic communication channel plays a central role. As it closes a global control loop any introduced communication delay possibly destabilizes the system and impairs the performance. The scattering theory is known to solve these stability issues by transmitting wave variables instead of haptic signals, i.e. force and velocity, over the communication channel...
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 is concerned with network-based multi-user haptic interaction using a distributed peer-peer control architecture. It proposes new quantitative measures for quantifying the fidelity of haptic simulations in such environments. User's perceived admittance and discrepancy among local copies of virtual objects are considered in defining these measures. A state prediction scheme is proposed to...
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