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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...
In this paper, a new parallel link mechanism ldquoDELTA-4rdquo is developed as a new haptic device within a high quality force display capability and operability. DELTA-4 realizes 3 DOF of translational motions by a new redundant parallel link mechanism. The name of the mechanism DELTA-4 is derived from a conventional parallel link mechanism ldquoDELTArdquo, because there are several common points...
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...
A robot controller is developed for human-robot handshaking. The focus of the work is to provide realistic experiences for the human participant in haptic interactions with a robot. To achieve this goal, a position-based admittance controller is implemented. By using haptic data as inputs, a hidden Markov model-based high-level controller is used to estimate human intentions and modify the reference...
Actuated car doors are a promising way to increase the convenience of access to cars. In this paper, an advanced door concept which can easily be integrated into conventional car doors is presented. Using a linear, non-backdrivable actuator and various sensors, both automatic and manual door operations can be realized. The principal part is the realization of a high-quality haptic interaction of the...
Humans significantly vary the impedance of their limbs during many manipulation tasks and during interaction with their environment. Humans vary their impedance to reduce contact forces, to increase positional control, and to stabilize unstable dynamics. The neuromuscular system modulates overall limb impedance by strategically selecting appropriate limb configurations and by selective activation...
An analog input shaper (AIS) was proposed as a means for increasing the virtual impedance range that could be stably displayed by haptic interfaces. The AIS reduces high frequency inputs to haptic interfaces, since high frequency inputs that usually occur during collisions with very stiff virtual objects can induce instabilities. The AIS is composed of an analog high-pass filter, two half-wave rectifiers,...
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...
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