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Le Touquet – Paris-Plage, France

Moroz G.,Institute Of Rercheche En Communications Et Cybernetique Of Nantes | Moroz G.,Laboratoire Dinformatique Of Paris | Chablat D.,Institute Of Rercheche En Communications Et Cybernetique Of Nantes | Wenger P.,Institute Of Rercheche En Communications Et Cybernetique Of Nantes | Rouiller F.,Laboratoire Dinformatique Of Paris
Mechanisms and Machine Science | Year: 2010

This paper investigates the existence conditions of cusp points in the design parameter space of the RPR-2PRR parallel manipulators. Cusp points make possible non-singular assemblymode changing motion, which can possibly increase the size of the aspect, i.e. the maximum singularity free workspace. The method used is based on the notion of discriminant varieties and Cylindrical Algebraic Decomposition, and resorts to Gröbner bases for the solutions of systems of equations. © Springer Science+Business Media B.V. 2010. Source


Barecke T.,Laboratoire Dinformatique Of Paris | Mansilla C.,CEA Saclay Nuclear Research Center | Avril S.,CEA Saclay Nuclear Research Center | Bouchon-Meunier B.,Laboratoire Dinformatique Of Paris | And 2 more authors.
International Journal of Energy, Environment and Economics | Year: 2011

A possibility to produce hydrogen without greenhouse gas emissions is to couple a thermochemical cycle with a nuclear reactor. Among the various thermochemical cycles, the Sulphur/Iodine process is currently the most studied. The production cost of hydrogen from this process is the sum of several cost accounts which are not at present known in any satisfactoryway. In this paper we present an approach to estimate the total production cost of 1kg of hydrogen. In order to overcome the problem of uncertain information associated with each cost account, we model them as fuzzy sets. We designed a software tool which enables us to easily define the necessary sets and computes reasonable results including the overall cost. Based on the assumed values given by recent research papers for the specific cost accounts, we were able to estimate the cost of being in the interval between 1.7 and 9.4€/kg, but most certainly between 3.0€/kg and 6.8€/kg. © 2012 Nova Science Publishers, Inc. Source


Moroz G.,Laboratoire Dinformatique Of Paris | Rouiller F.,Laboratoire Dinformatique Of Paris | Chablat D.,CNRS Research Institute of Communication and Cybernetics of Nantes | Wenger P.,CNRS Research Institute of Communication and Cybernetics of Nantes
Mechanism and Machine Theory | Year: 2010

This paper investigates the cuspidal configurations of 3-RPR parallel manipulators that may appear on their singular surfaces in the joint space. Cusp points play an important role in the kinematic behavior of parallel manipulators since they make possible a non-singular change of assembly mode. In previous works, the cusp points were calculated in sections of the joint space by solving a 24th-degree polynomial without any proof that this polynomial was the only one that gives all solutions. The purpose of this study is to propose a rigorous methodology to determine the cusp points of 3-RPR manipulators and to certify that all cusp points are found. This methodology uses the notion of discriminant varieties and resorts to Gröbner bases for the solutions of systems of equations. © 2010 Elsevier Ltd. All rights reserved. Source

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