Carsten Preusche

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In this paper, a passive bilateral control scheme is proposed for a teleoperator with time-varying communication delay. Recently proposed two-port time-domain passivity approach (TDPA), which composed of Passivity Observer (PO) and Passivity Controller (PC), is extended. A set of sufficient conditions is derived, which satisfies the passivity of the(More)
A recently proposed method for stabilizing haptic interfaces and teleoperation systems was tested with a “PHANToM” commercial haptic device. The “Passivity Observer” (PO) and “Passivity Controller” (PC) stabilization method was applied to stabilize the system but also excited a high frequency mode in the device. To solve this problem, we propose a method to(More)
Despite a lot of research in recent years stable and realistic haptic interaction with virtual environments keeps an unsolved problem. Among different approaches the Voxmap-PointShell (VPS) method seems very promising due to constant sample rates, independent of the static environment. But there is still the stability problem to be solved globally. In this(More)
In the present study, a vibrotactile feedback device for spatial guidance was evaluated in tracking task paradigm. Participants (N = 18) had to translate and rotate virtual objects according to the vibrotactile vs. verbal cues without visual information. Both types of spatial guidance were evaluated using objective performance data (i.e. speed, accuracy) as(More)
ROKVISS, Germany's newest space robotics technology experiment, was successfully installed outside at the Russian Service Module of the International Space Station (ISS) during an extravehicular space walk at the end of January 2005. Since February 2005 a two joint manipulator is operated from ground via a direct radio link. The aim of ROKVISS is the in(More)
This article presents a haptic system for bimanual haptic feedback that is composed of two light-weight robot arms. The system has a workspace and force capabilities similar to that of two human arms. Sophisticated control strategies are implemented to enable using this system as haptic interface. Depending on the requirements of the task one of three(More)
Recent analysis on the stability boundary for haptic rendering assumed a stabilizing effect through a human operator holding a haptic device, without considering his/her dynamics directly. This paper derives stability boundaries of a linear model of a haptic system including those dynamics. It shows that all three elements of the human arm modeled as(More)