ESTIA Recherche

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ESTIA Recherche

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Lizarralde I.,ESTIA Recherche | Tyl B.,APESA
Journal of Cleaner Production | Year: 2017

Although the impact of technology on society has been widely studied in the literature, few studies have proposed a practical approach directly engaging stakeholders, including designers and engineers, in the development of new products and services. Within the degrowth movement, some approaches criticizing the western model of development suggest original criteria that could be integrated in the design process.The current study seeks to analyze the conviviality concept of Ivan Illich (1973) to develop a new framework for designers. To that end, current design literature and four industrial case studies were analyzed according to the five main threats to conviviality: the biological degradation of the ecosystem, radical monopoly, over-programming, polarization, and obsolescence. As a result, this paper proposes a framework that includes two guidelines: one for product scope and another for the socio-technical system scope. The guidelines are composed of a set of recommendations that emerge from the relationship between the threats to conviviality and life cycle stages of a product or service.These recommendations allow designers and engineers to better approach the complexity of the design process and co-create a strong sustainable society with stakeholders. © 2017.


Larrasquet J.-M.,University of Pau and Pays de l'Adour | Lizarralde I.,ESTIA Recherche
ACM International Conference Proceeding Series | Year: 2010

In this contribution, we are focusing on this side of complexity which is grounded on omnipresence of interpretation in the production of cognitive objects in the processes of innovation and design, their organization and management. Our "socio-cognitive" approach allows highlighting the status of these objects (particularly the concept of a "system") and also what "producing knowledge" means in the frame of such processes. This reflection leads us to (re-) consider the way we have to build "systems" socio-cognitively, to take life-cycles into consideration and to begin to think about the development of knowledge and competences that actors (particularly project managers) need in order to intervene cleverly in the management of such projects of innovation and design. Copyright © 2010 ACM.


Cagin S.,ESTIA Recherche | Fischer X.,ESTIA Recherche
Lecture Notes in Mechanical Engineering | Year: 2017

The complexity of flow inside cylinder leads to develop new accurate and specific models. Influencing the 2-stroke engine efficiency, the scavenging process is particularly dependent to the cylinder design. To improve the engine performances, the enhancement of the chamber geometry is necessary. The development of a new neuro-separated meta-model is required to represent the scavenging process depending on the cylinder configuration. Two general approaches were used to establish the meta-model: neural networks and NTF (Non-negative Tensor Factorization) separation of variables. To fully describe the scavenging process, the meta-model is composed by four static neural models (representing the Heywood parameters), two dynamic neural models (representing the evolution of gases composition through the ports) and one separated model (the mapping of the flow path during the process). With low reduction errors, these two methods ensure the accuracy and the relevance of the meta-model results. The establishment of this new meta-model is presented step by step in this article. © Springer International Publishing AG 2017.


Bonithon G.,ESTIA Recherche | Bonithon G.,BART | Joyot P.,ESTIA Recherche | Chinesta F.,Airbus | Villon P.,UTC Roberval
Engineering Analysis with Boundary Elements | Year: 2011

There are many ways to solve spacetime linear parabolic partial differential equations by using the boundary element method (BEM). In general, standard techniques make use of an incremental strategy. In this paper we propose a novel alternative of efficient non-incremental solution strategy for that kind of models. The proposed technique combines the use of the BEM with a proper generalized decomposition (PGD) that allows a spacetime separated representation of the unknown field within a non-incremental integration scheme. © 2010 Published by Elsevier Ltd.


Nourdine S.,ESTIA Recherche | Nourdine S.,University of the Basque Country | Camblong H.,ESTIA Recherche | Camblong H.,University of the Basque Country | And 2 more authors.
18th Mediterranean Conference on Control and Automation, MED'10 - Conference Proceedings | Year: 2010

This paper focuses on the design of Linear Quadratic Gaussian (LQG) controllers for variable-speed horizontal axis Wind Turbines (WT). These turbines use blade pitch angle and electromagnetic torque control variables to meet specified objectives for Full Load (FL) zone. The main control objectives are to reduce structural dynamic loads and to regulate the power of the WT. The controllers are designed in order to optimize a trade-off between several control objectives. Four different LQG using Individual Pitch Control (IPC) are designed, with Wireless-Sensors (WS) placed at the end of the blades for the last one. Their control model is progressively more complex. The first one takes into account a rigid simple behavior, the second control model considers the first mode of the drive-train flexibility, the third model takes into account the drive-train and tower flexibilities and the fourth that of the blades. Likewise, their optimization criteria consider for each controller a new control objective to alleviate fatigue loads in the drive-train, then, also in the tower and finally also in the blades. The evaluation of the fatigue loads affecting the WT components are based on a Rainflow Counting Algorithm (RFC) and the Miner's rule. The results indicate a significant reduction of fatigue loads especially in the drive-train and the blades when its flexibility is taken into account in the control models. © 2010 IEEE.


Tyl B.,APESA | Lizarralde I.,ESTIA Recherche | Allais R.,University of Technology of Troyes
Procedia CIRP | Year: 2015

Design has a great role to play in sustainability. Interesting progresses has been performed within the last decades. Nevertheless, some issues of sustainability, and their impact on design, remains poorly studied. Specifically, when it comes to the field of local value creation, the literature in design is still limited. However, the Local Value Creation (LVC) thinking can be a great insight for designers to develop more ecoinnovative concepts, through new product design, new services and new business models. In order to go towards this direction, it is necessary to include new variables that are rarely considered in design processes such as the local workforce, sustainable local resources or the customization of the new product or service for local customers. This paper proposes a better understanding of the relation between eco-design approaches and LVC, and more precisely how current eco-design approaches consider this issue. To do so, a first part introduces the Local Value Creation concept and its challenges for sustainability. Then, a second part focuses on a literature review to understand how the LVC dimension is studied in the eco-design process. This will lead in a third section to concretely characterize how eco-design approaches and tools consider LCV issue. A last section proposes to identify potential contradiction between the LVC and the eco-design concept, in order to draw first outlines of a new eco-design paradigm with a Local Value Creation dimension. © 2015 The Authors. Published by Elsevier B.V This is an open access article under the CC BY-NC-ND license.


Dupe V.,ESTIA Recherche | Sebastian P.,French National Center for Scientific Research | Fischer X.,ESTIA Recherche | Fischer X.,French National Center for Scientific Research | Briand R.,ESTIA Recherche
Expert Systems with Applications | Year: 2012

We propose a decision support method in embodiment design, dedicated to embedded autonomous microsystems design. The main objective of our work is to go beyond battery configurations by supporting the design of autonomous microsystems, namely systems able to harvest and use available energy from their environment. The main challenge of our approach consists of supporting the designer's decisions from qualitative representation to physical models. We have thus developed instruments, both based on flows and effect analysis and behavioral component modeling. The method decreases the number of potential alternatives to obtain the best solution and the associated models. To validate our method, we focus on a marketed wired road sensor. © 2012 Elsevier Ltd. All rights reserved.


Abi Akle A.,ESTIA Recherche | Abi Akle A.,École Centrale Paris | Minel S.,ESTIA Recherche | Yannou B.,École Centrale Paris
Proceedings of the International Conference on Engineering Design, ICED | Year: 2015

Design space exploration, that is an embodiment of a paradigm Design by Shopping, refers to the systematic activity of discovery and evaluation of the elements in the design space in order to identify optimal solution by reducing the design space toward an area of performance. This activity is composed of three main phases: The discovery, the optimization and the selection. There are existing tools for the design space exploration with different graphs (ScatterPlot matrix, 2D and 3D scatter plot, parallel coordinates plot, etc.). These graphs are useful for the representation of multidimensional set of data with an unlimited number of alternatives (design points). Obviously, during the selection phase, designers face to a reduced design space with a limited number of design points (in a performance area). Thus, in our work, we try to identify which graph is the most adapted to the selection phase. It emerges, from literature, three graphs useful for the representation of multidimensional set of data (>3 variables) and with a limited number of alternatives (<50). Thus we have designed experimentation composed of 3 scenarios (with 13 design parameters and 5 variables of performance) performed by 30 participants. It results one graph more suited to the selection phase in the Design by Shopping: The Parallel Coordinates Plot.


Balanuta C.,University of Galati | Vechiu I.,ESTIA Recherche | Gurguiatu G.,University of Galati
2012 16th International Conference on System Theory, Control and Computing, ICSTCC 2012 - Joint Conference Proceedings | Year: 2012

In this paper is presented a comparative analysis between two power conditioners connected to a four-wire micro-grid. The first one was developed on a two levels voltage structure and the second one on a three-level voltage NPC structure (Neutral Point Clamped), both controlled by the same strategy. The main objective of the proposed strategy is to limit the disturbance produced by different loads. Another goal is to act as an interface between renewable energy sources and the micro-grid. In this study, about 25% of the power requested by the load comes from the renewable energy sources. The investigated systems have been implemented in Matlab / Simulink, in order to analyze the micro-grid harmonic level, the power factor and the voltage unbalance at the point of common coupling. © 2012 Dunarea de Jos University.


Dupe V.,ESTIA Recherche | Dupe V.,French National Center for Scientific Research | Briand R.,ESTIA Recherche
International Journal on Interactive Design and Manufacturing | Year: 2010

This paper describes a multidisciplinary and interactive approach for the design of autonomous microsystems. These devices satisfy the actual requirements in terms of size, cost and autonomy. This autonomy is obtained by harvesting the energy in microsystem environment. There is no denying that microsystem design requires multidisciplinary skills and necessitates collaboration between several groups with different fields of expertise. All aspects have to be considered to get a mechanically, electronically and energetically efficient structure, consistent with the specifications and the requirements of the problem. However, few designers are competent enough in all the involved engineering fields. Thereby, we propose a multidisciplinary and interactive approach for autonomous microsystem design. This method delves into several steps. It begins by a global description and analysis of the system in its environment. This problem structuring is mainly based on the use of tools of functional analysis. Then, the autonomous microsystem is modeled, with a special care on energy harvester design. The method is applied to energy harvester design for automotive braking system instrumentation. The interactive character is present through the consideration of interactions (cognitive, physical and sensory). Finally, the multidisciplinary aspect is ensured by the collaboration and the exchanges between designers and numeric tools. © 2009 Springer-Verlag.

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