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Strasbourg, France

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. Source

Mamoghli S.,LGECO | Goepp V.,ICube | Botta-Genoulaz V.,INSA Lyon
Enterprise Information Systems | Year: 2015

Enterprise Resource Planning (ERP) systems offer standard functionalities that have to be configured and customised by a specific company depending on its own requirements. A consistent alignment is therefore an essential success factor of ERP projects. To manage this alignment, an ‘Operational Model Based’ method is proposed. It is based on the design and the matching of models, and conforms to the modelling views and constructs of the ISO 19439 and 19440 enterprise-modelling standards. It is characterised by: (1) a predefined design and matching order of the models; (2) the formalisation, in terms of modelling constructs, of alignment and misalignment situations; and (3) their association with a set of decisions in order to mitigate the misalignment risk. Thus, a comprehensive understanding of the alignment management during ERP projects is given. Unlike existing methods, this one includes decisions related to the organisational changes an ERP system can induce, as well as criteria on which the best decision can be based. In this way, it provides effective support and guidance to companies implementing ERP systems, as the alignment process is detailed and structured. The method is applied on the ERP project of a Small and Medium Enterprise, showing that it can be used even in contexts where the ERP project expertise level is low. © 2015 Taylor & Francis Source

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. Source

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. Source

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. Source

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