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Lejeune A.,FEMTO ST Institute | Bechet F.,University of Valenciennes and HainautCambresis | Boudaoud H.,CNRS Research team on Innovative Processes | Mathieu N.,CNRS Study of Microstructures, Mechanics and Material Sciences lab | Potier-Ferry M.,CNRS Study of Microstructures, Mechanics and Material Sciences lab
Advances in Engineering Software | Year: 2012

The Manitoo library is devoted to the resolution of analytical non-linear problems using a high order method called asymptotic numerical method. We describe here the Object Oriented design of this library and especially the choices made to obtain a quite generic and flexible numerical solver. Through classical examples, we present a comparison with some existing tools implemented in Matlab and Fortran 77. © 2012 Elsevier Ltd. All rights reserved. Source


Perrard C.,University of Franche Comte | Bonjour E.,CNRS Research team on Innovative Processes
International Journal of Advanced Manufacturing Technology | Year: 2012

This paper is related to the field of assembly plan generation. It describes a new approach to a priori check the consistency of an assembly strategy that is given by the assembly system designers before running an assembly plan generation algorithm. The aim of this work is to improve the assembly plan designer's efficiency by reducing the research space while proving the existence of acceptable solutions. The assembly strategy combined with the product's model implies a set of constraints on the assembly processes. The proposed method determines whether the given assembly strategy produces possible assembly processes. In case of inconsistencies among the strategic constraints, the method will help the designer to identify the contradictory constraints. The set of constraints can be expressed by a Boolean equation. First we present the key concepts and models related to the product, processes, and added values in the field of assembly plan generation. Second we define existing strategic constraints, and propose three new ones and a classification of strategic assembly constraints. The originality of the proposed method consists in defining an elementary strategic constraint that is used to describe every other constraint. The proposed method leads to model an assembly strategy by a single Boolean equation that is used to check the inconsistencies. An industrial case study is provided to highlight and to demonstrate the interests of this approach. © Springer-Verlag London Limited 2012. Source


Armaghan N.,CNRS Research team on Innovative Processes | Renaud J.,Laboratoire Of Genie Of La Conception
Information Sciences | Year: 2012

Industrial decision-makers often try to develop new products by reusing their past experience. Methods for obtaining feedback are available in knowledge management and produce tangible results in the industrial world. Nowadays, companies often consider employees' knowledge as an asset. This approach is a potential answer for reusing knowledge acquired through experience. The Case-Based Reasoning (CBR) methodology, based on cognitive sciences, consists in solving new problems by reusing past experience. Case-Based Reasoning is an approach to solving a new problem by remembering and adapting a previous successful similar situation to the problem at hand. Of the four activities comprising CBR - Retrieve, Reuse, Revise, and Retain-this paper deals with the "Retrieve" phase. Consequently, we suggest using the Multi-Criteria Decisions concept in problem description to search for the solution in a case-based scenario. We show that Multi-Criteria Decisions and Case-Based Reasoning are complementary. This paper proposes using knowledge acquisition as a basis for seeking solutions from non-compensatory multi-criteria decision aids such as the ELECTRE-I and ELECTRE-II methods. We also carry out a robustness analysis at the end of this paper. We describe an industrial application with wire forming machines as an illustration of our recommendation. © 2012 Elsevier Inc. All rights reserved. Source


Akoussan K.,CNRS Study of Microstructures, Mechanics and Material Sciences lab | Boudaoud H.,CNRS Research team on Innovative Processes | Daya E.M.,CNRS Study of Microstructures, Mechanics and Material Sciences lab | Daya E.M.,Laboratory of Excellence on Design of Alloy Metals for Low mAss Structures DAMAS | And 2 more authors.
Composite Structures | Year: 2016

Damping properties of viscoelastic composite structures are related to the thicknesses of their layers. To design these structures, there is a need to know their damping properties sensitivities according to the thicknesses of their layers. This allows to evaluate errors committed in the design for a layer thickness variation or to predict the damping properties of other structures having the same dimensions (length and width) except the layers thicknesses. Sensitivity analysis conducted to date are limited to the first derivative approximation which reduces considerably the calculation accuracy and the convergence radius but are computation time consuming. In this paper, we propose a high order continuous sensitivity analysis of the damping properties of viscoelastic composite plates according to their layers thicknesses. This method allows to get the exact values of the optimal damping properties and the high order derivative. Two cases are considered herein: the variation of only the thickness of the core layer and the variation of the thickness of each layer the total thickness of the structure being constant. Results showed that the damping properties variation is not standard but related to the viscoelastic material, the fibers orientation of the laminated faces, the boundary conditions and the structure dimensions. © 2016 Elsevier Ltd. Source


Perrard C.,University of Franche Comte | Bonjour E.,CNRS Research team on Innovative Processes
International Journal of Advanced Manufacturing Technology | Year: 2013

Sequence planning generation is an important problem in assembly line design. A good assembly sequence can help to reduce the cost and time of the manufacturing process. This paper focuses on assembly sequence planning (ASP) known as a hard combinatorial optimization problem. Although the ASP problem has been tackled via even more sophisticated optimization techniques, these techniques are often inefficient for proposing feasible assembly sequences that satisfy the assembly planners' preferences. This paper presents an approach that makes easier to check the validity of operations in assembly process. It is based on a model of the assembly planners' preferences by means of strategic constraints. It helps to check a priori the consistency of the assembly constraints (strategic and operative constraints) given by the assembly system designers before and while running an assembly plan generation algorithm. This approach reduces the solution space significantly. A case study is presented to demonstrate the relevance of the proposed approach. © 2013 Springer-Verlag London. Source

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