20 research outputs found
Grasping Points Determination Using Visual Features
This paper discusses some issues for generating point of contact using visual features. To address these issues, the paper is divided into two sections: visual features extraction and grasp planning. In order to provide a suitable description of object contour, a method for grouping visual features is proposed. A very important aspect of this method is the wa
A review of parallel processing approaches to robot kinematics and Jacobian
Due to continuously increasing demands in the area of advanced robot
control, it became necessary to speed up the computation. One way to
reduce the computation time is to distribute the computation onto
several processing units. In this survey we present different approaches
to parallel computation of robot kinematics and Jacobian. Thereby, we
discuss both the forward and the reverse problem. We introduce a
classification scheme and classify the references by this scheme
Parallele Bewegungsplanung in dynamischen Umgebungen
Dieser interne Bericht gibt einen Ueberblick ueber die aktuellen
Forschungsergebnisse aus dem gleichnamigen Projekt. Hierbei wird das
Problem der praktikablen Bewegungsplanung fuer Industrieroboter in
dynamischen Umgebungen angegangen. Der Grundalgorithmus ohne
wesentliche off-line Berechnungen basiert auf der A*-Suche und arbeitet
im impliziten, diskretisierten Konfigurationsraum. Die Kollisionen
werden im kartesischen Arbeitsraum durch hierarchische
Abstandsberechnung im gegebenen CAD-Modell erkannt. Eine zyklische
Aufteilung des Suchraums auf die einzelnen Prozessoren ermoeglicht eine
gut skalierbare Parallelverarbeitung fuer nachrichten-gekoppelte
Rechnersysteme. Die Leistungsfaehigkeit des Bewegungsplaners wird an
einem Satz von Benchmark-Problemen validiert. Unterstuetzt durch eine
optimale Diskretisierung zeigt der neuartige Ansatz einen linearen
Speedup. Fuer Umgebungen mit unbewegten Hindernissen liegen die
Laufzeiten im Sekundenbereich. Zur weiteren Beschleunigung der
Bewegungsplanung wird erstmalig eine heuristische hierarchische
Suche im impliziten Konfigurationsraum eingefuehrt. Fuer zweidimensionale
Benchmark-Probleme ergibt die Hierarchisierung eine starke Reduktion des
Suchaufwandes
Modeling and Verification of a Robotic Surgical System using Hybrid Input/Output Automata
The area of robotic surgical systems has to deal with several important safety aspects to ensure that the patient and the Operating Room staff are safe. A robotic surgical system has to fulfill specific safety requirements and to ensure that the system reacts like its specification. To this end, a verification process is necessary. In this paper an architecture for robotic surgery is modeled using the framework of Hybrid Input/Output Automata (HIOAs). A case study based on a surgical robotic operation scenario is presented and modeled using HIOAs. Exploiting the modularity and compositionality theory of HIOAs, the verification of the system is performed
Application of Contract-based verification techniques for Hybrid Automata to Surgical Robotic Systems
Surgical robotic systems have to deliver a high quality of safety, since they deal with human lives. Their safety specifications must ensure the absence of risks for the patient and the operating room staff. To respect the modular nature of a surgical system, we propose a contract based verification approach for safety. We introduce a case study based on a typical surgical robotic operation scenario and model its components by using hybrid automata. We exploit the theory of parallel composition of contracts to verify properties on each component and prove that the property of the overall system can be obtained by composition