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Frechard J.,University of Strasbourg | Knittel D.,LGeCo
Mechanism and Machine Theory | Year: 2013

This paper analyzes for the first time the influence of the master roller placement of roll-to-roll systems and the effects of velocity and tension bandwidths. In such systems, each motor driven roller is controlled separately (decentralized control). The influence of the master roller position, which is only controlled in velocity and therefore gives the web speed, is studied. The other motor driven rollers are also controlled using optimized PI web tension controllers, automatically synthesized in the fixed-order and structure H ∞ framework. The web speed and tension control bandwidths play a major role on the system performances and therefore have to be chosen carefully. The impact of the master roller placement, considering several setting values of speed and control bandwidths, is analyzed with respect to reference tracking, disturbance rejection and robustness to web elasticity variations. Several configurations and settings are compared in time domain simulations and frequency system/signal analysis. © 2013 Elsevier Ltd.

Sun H.,Jilin University | Sun H.,University of Strasbourg | Houssin R.,LGECO | Houssin R.,University of Strasbourg | And 2 more authors.
International Journal of Industrial Ergonomics | Year: 2013

Engineering design processes are often technology-centred and have difficulties adequately integrating user behaviour in product design. Although, industry and academia agree that the human aspect is important for the success of a product, there are few methods and tools that help designers with such factors during the synthesis of the design process. This paper covers multi-trade engineering design, and deals with the development of a behavioural design approach to help designers optimize product performance in the design phase by taking into account use conditions and requirements. This method integrates user and product behavioural data as design work. These two behavioural are defined as tasks to do by user and product. So a set of solutions could be considered before choosing a final solution. Thus, a software application is being developed to support and allow a systematic utilization of the " behavioural design approach" (BDA) by integrating it into the daily work of the designer. An application is presented to show the applicability of our method. Relevance to industry: The article describes a behaviour design approach to be used by industrial engineers, designers and ergonomists for ergonomic analysis and evaluation in product or machine design. The approach has been developed for both expert and non-expert practitioners, who can integrate user behaviour and product behaviour during the design phase for improving product performance. © 2012 Elsevier B.V.

Rousselot F.,French National Center for Scientific Research | Zanni-Merk C.,French National Center for Scientific Research | Cavallucci D.,LGECO
Computers in Industry | Year: 2012

For nearly two decades, TRIZ has appeared as a set of methodological tools useful for supporting inventive aims in industry. The central aspect of a process based on TRIZ invariably involves the formulation of a contradiction, although there has been very little research conducted about the formalization of this notion. Our paper proposes a formal definition of the contradiction and of its potential manipulations useful in inventive design in accordance to the fundamentals of TRIZ. This formalization is particularly important when software tools are needed to implement TRIZ in industry. This work is also necessary at a moment where perceptions associated with the TRIZ point of view about contradictions diverge away from what made TRIZ original and relevant in the innovation area. © 2012 Elsevier B.V.

Zanni-Merk C.,LGECO | Cavallucci D.,LGECO | Rousselot F.,LGECO
Computers in Industry | Year: 2011

The paradigm change that rules our industry (currently evolving under the quality paradigm) requires an enterprise to organize innovation in a pragmatic way. Beyond theoretical discourses around the necessity for innovation, methods and tools, based on theories should now be translated into engineering practices to be efficiently applied. One of the consequences of this necessary evolution is that R&D departments (and especially project teams), familiar with methods and tools inherited from quality area, are pushed toward changes in their practices sometimes far from their respective cultures. Software tools for accompanying this evolution are needed. This article proposes the use of ontologies as a base to the development of those software tools. Formalization of the main concepts concerning inventive design is provided by the use of formal ontologies. The tools already developed assist the expert in the conduction of an inventive design study, from problem formulation to the proposal of solution concepts. © 2010 Elsevier B.V. All rights reserved.

Souili A.,LGeCO | Cavallucci D.,LGeCO
Procedia Engineering | Year: 2015

Patents are valuable source of knowledge and are extremely important for assisting engineers and decisions makers through the inventive process. This paper describes a new approach of automatic extraction of IDM (Inventive Design Method) related knowledge from patent documents. IDM derives from TRIZ, the theory of Inventive problem solving, which is largely based on patent's observation to theorize the act of inventing. Our method mainly consists in using natural language techniques (NLP) to match and extract knowledge relevant to IDM Ontology. The purpose of this paper is to investigate on the contribution of NLP techniques to effective knowledge extraction from patent documents. We propose in this paper to firstly report on progress made so far in data mining before describing our approach. © 2015 The Authors. Published by Elsevier Ltd.

Souili A.,LGeCO | Cavallucci D.,LGeCO
Procedia Engineering | Year: 2015

Patents are increasingly of great importance to innovation performance. A patent document is an important source of technological knowledge where artifact evolves according to problems and partial solutions. This paper reports on an on-going research whose goal is to provide design engineer with an efficient patent mining tool that re-structures a patent corpus in a problem graph to better highlight state of the art of given field of knowledge. The methodology employed to achieve such a functionality is based on a NLP method that manage both IDM-TRIZ concepts and patent corpuses contents. The paper also presents a case study in steel making industry to illustrate the methodology. © 2015 The Authors. Published by Elsevier Ltd.

Chinkatham T.,LGECO | Cavallucci D.,LGECO
Procedia Engineering | Year: 2015

Inventive Design Method (IDM) is an extension of TRIZ. It was developed to solve classical TRIZ limits and address therefore wider and more complex problematic situations. The context of Solution Concepts developed with the aid of IDM is incomplete, conflicting and produces uncertain information. As a result, it becomes more difficult to evaluate then select which Solution Concepts to refine for more in-depth development. The early evaluation stage that is held by experts is usually an informal meeting and it involves generally instinctive judgments based on the experience of the experts. Thus it has a tendency to lack accuracy. The immediate reactions of experts have a strong influence on the decision and always tend to be negative when facing novel Solution Concept and time restrictions in the design cycle. This obvious reaction causes them to abandon Solution Concepts that are considered as unfeasible, too risky or outside of the primary focus of the design project. In order to prevent the rejection of good Solution Concepts or to screen out unfeasible ones, we proposed an approach to assist the designers in increasing confidence in the Solution Concept by providing a rapid estimation and/or exploration of the feasibility of a tested Solution Concept. The results obtained will be further used as inputs in the selection task. In this way, a designer acquires a certain degree of justification in bypassing expert intuition. Consequently, the evaluation and selection process can be implemented with accuracy. In this paper, we will report on current progress made on our ongoing research, and a case study will be given to demonstrate the practicability of the proposed approach. © 2015 The Authors. Published by Elsevier Ltd.

The analysis of initial situation is necessary when dealing with the complex engineering situation. Furthermore, innovation is the underlying foundation of technological advances and today's competitive economy. Patents contain important research and it is also possible to find within them a kind of history of the evolution of an artifact. Used effectively, patents can help to provide businesses and individuals work with innovative ideas. In this context, the engineers may very often need to analyze them in order to benefit from the knowledge contained therein to organize their inventive task. However, patents are lengthy and rich in technical terminology; analyzing patents may require a lot of human effort. Thus, automating the process is very timely. To facilitate this, several patent analysis tools have been created. There are also patent analysis tools dedicated to highlighting various values of tools, but very few of them are designed to extract information or knowledge contained in patents. This paper presents an ongoing research on knowledge extraction for the Inventive Design Method (IDM), which extends from TRIZ, the theory of inventive problem solving. © 2015 The Authors. Published by Elsevier Ltd.

Nowamooz H.,LGECO | Nowamooz H.,University of Lorraine | Jahangir E.,University of Lorraine | Masrouri F.,University of Lorraine
Engineering Geology | Year: 2013

This paper presents a simple approach to model the hydro-mechanical behaviour of swelling soils at different initial states during successive wetting and drying cycles. This model was developed based on the experimental results obtained for an expansive bentonite/silt mixture compacted at three different initial dry densities representing loose, intermediate and dense states. The parameters of the simplified model were initially fitted based on the results obtained for the loose and dense samples and then used to estimate the hydraulic and mechanical behaviour of the intermediate samples. Generally, the model prediction produced a satisfactory correspondence with the experimental results. © 2012 Elsevier B.V.

Nowamooz H.,LGECO | Chazallon C.,LGECO
Construction and Building Materials | Year: 2011

Construction with natural soils is becoming more and more popular due to new geoenvironmental approaches. In this context, this paper presents initially several experiments performed on the Missillac sand used as natural soil in this study: Identification tests to determine the pore size distribution curve as well as the compaction curve.Suction measurement to obtain the Soil Water Retention Curve (SWRC).Repeated Load Triaxial Tests (RLTT) to study the resilient mechanical behaviour of the soil when accommodation is observed after several cycles.Montonic triaxial tests to determine the Critical State Line (CSL). With these tests, all the parameters of the different constitutive models required for the elastoplastic modelling of the hydro-mechanical behaviour of this material can be determined. We propose finally, in this paper, to model a rammed earth wall built in this natural soil. The elastoplastic modelling was then performed, under static loadings, with the finite element code Cast3M. A good stability of the wall can be observed under the various loadings for the drier soils compared to the wall built at the water content w = 11%. © 2010 Elsevier Ltd. All rights reserved.

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