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Llaria A.,ESTIA | Terrasson G.,ESTIA | Arregui H.,Vicomtech | Hacala A.,ESTIA
Proceedings of the IEEE International Conference on Industrial Technology | Year: 2015

Nowadays, interconnected ubiquitous objects are more and more present in different applications as a technical solution to collect, every time and everywhere, great amounts of data which are accessible through the Internet. One interesting area of application is the monitoring of cattle, in order not only to improve the farming working conditions but also to better know the behavior of the animals. In this work, a geolocation and monitoring platform oriented to extensive farming in mountain environments is presented. The proposed solution is composed of low power long range communication geolocation devices and a dedicated interface, accessible by means of different portable devices, which allows users to access and study the collected data. © 2015 IEEE.

Legardeur J.,ESTIA | Legardeur J.,University of Bordeaux 1 | Boujut J.F.,French National Center for Scientific Research | Tiger H.,French National Center for Scientific Research
Research in Engineering Design | Year: 2010

This paper presents the results of an empirical study focused on the observation and analysis of an innovative design process. We have had the opportunity to observe and participate in the early phase of a new innovative project within a design office of a truck manufacturer. Our observations based on the actor-network theory highlight the importance of the various design rationales carried by the actors involved. The results of this study show the weakness and complexity of an innovative process within a highly constrained environment. We particularly show that carrying out innovation requires different viewpoints with regard to the object of the design to evolve along with the network of actors and the organisation involved. The issue of product and process integration involving knowledge transfer between actors throughout the design process is also discussed here. As a result, we highlight the importance of rethinking the interface role played by the material expert (in our case) and, in line with other works, we put forward the "interface actor" as the key network actor involved during the early development phases. To provide the network and the interface actor with a means to share information and co-operate during these informal early design phases we propose some features of a new web-based information system and the basis for a debate on the idea lifecycle management concept as a solution to the issue of innovative idea information structuring. © 2010 Springer-Verlag London Limited.

Vechiu I.,ESTIA | Gurguiatu G.,University of Galati | Rosu E.,University of Galati
2010 9th International Power and Energy Conference, IPEC 2010 | Year: 2010

This paper presents a three-phase Active Power Conditioner to improve power quality in microgrids based on renewable energy. A microgrid is a weak electrical grid which can be easily subject to disturbances. The Active Power Conditioner (APC) presented in this paper acts as an interface between renewable energy sources and the AC bus of a microgrid and uses an improved control strategy, which makes possible to inject energy in the microgrid, compensate the current harmonics and correct the power factor. Moreover, the proposed control strategy allows the line current at the point of common coupling (PCC) to be balanced and sinusoidal even when the load is unbalanced. Consequently, the voltage at the PPC becomes balanced. Simulation results show the validity of the innovative control strategy. ©2010 IEEE.

Lartigau J.,ESTIA | Coureau J.-L.,University of Bordeaux 1 | Morel S.,University of Bordeaux 1 | Galimard P.,University of Bordeaux 1 | Maurin E.,CNRS Research Laboratory for Historical Monuments
International Journal of Fracture | Year: 2015

Glued-in-rods in timber structures lead to overcome the use of traditional bolted connections, preserve a large part of the original timber and offer aesthetic benefits. Several research programs were achieved to improve the mechanical knowledge of this technique, exhibiting experimentally the influence of materials and the effect of the geometric configuration. From these experimental results, some design rules predicting the axial strength are available, but a common criterion is still lacking. This paper relates to experimental investigations and finite element computations on glued-in rods, with the aim of providing a better knowledge about their mechanical behavior until failure. An experimental campaign is carried out on single glued-in rod connections. The finite element modeling reproduces the experimental configuration: it exhibits significant normal stress (to the interface) at the onset of the bonding, in comparison with shear stress. Within the framework of equivalent linear elastic fracture mechanics, resistance curves in mode I and mode II are established for each specimen. Finally, a mixed mode fracture criterion (I/II) is used to describe the fracture process zone development at the wood-adhesive interface (failure zone). An analytical formulation is then proposed allowing the evaluation of peak load of each specimen, which highlights a new approach for the design of such connections. © 2014, Springer Science+Business Media Dordrecht.

Latortue X.,ESTIA | Minel S.,ESTIA
Green Design, Materials and Manufacturing Processes - Proceedings of the 2nd International Conference on Sustainable Intelligent Manufacturing, SIM 2013 | Year: 2013

French construction industry is facing radical changes: the new 2012 Thermal Regulations as well as an increasing tendency from decision-makers to select the lowest tender force the constructors to change their practices. Those constraints have a deep impact on the industry. Reconsidering constructors behaviour appears to be essential. Current efforts focus on the adoption of manufacturing concepts including Concurrent Engineering (CE). Implementation of CE fosters a more efficient collaboration and increases the users needs consideration. Using 4D CAD or Building Information Modeling can also be a great contribution. Practices changes should succeed through CE trainings and it is crucial to develop procedures that will be followed by the construction actors. As a conclusion, case studies are rare and studying the implementation conditions of concurrent methodologies in the construction industry appears as a relevant approach to investigate. © 2013 Taylor & Francis Group.

Ghouaiel N.,ESTIA IRIT | Cieutat J.-M.,ESTIA | Jessel J.-P.,CNRS Toulouse Institute in Information Technology
ACM International Conference Proceeding Series | Year: 2014

An augmented reality system is used to complete the real world with virtual objects (computer generated) so they seem to coexist in the same space as the real world. The concept of plasticity [4][5] was first introduced for Human Computer Interaction (HCI). It denotes the ability of an HCI interface to fit the context of use defined by the user, the environment and the platform. We believe that plasticity is a very important notion in the domain of augmented reality. Therefore, we rely on it in order to introduce the concept of adaptive augmented reality. This concept is based on the triplet (user, environment and platform) constituting the context of use. Adaptive augmented reality can foster functional ability, ease of use and portability of new augmented reality applications. Thus, we describe in this paper three applications showing the adaptation of augmentation based on three variables: the scene illumination, the distance to the target and the ambient noise.

Takouachet N.,ESTIA | Legardeur J.,IMS | Lizarralde I.,ESTIA
ACM International Conference Proceeding Series | Year: 2014

Facilitation is proved to improve group problem-solving effectiveness, research new concepts and innovative solutions. This paper addresses facilitation role during a creative session in the digital environment. We evaluate existing collaborative software based on the metaphor of the sticky note and we show that they are designed for use without necessarily taking into account the presence of a facilitator. They offer however, a set of functions that are relevant to the group and its individuals. According to our findings, we suggest a set of principal features to fully integrate the role of the facilitator into digital creativity sessions. Copyright 2014 ACM.

Kreckelbergh S.,ESTIA | Vechiu I.,ESTIA
2012 16th International Conference on System Theory, Control and Computing, ICSTCC 2012 - Joint Conference Proceedings | Year: 2012

This paper presents the first results of the OptimaGRID project which focuses on the design of a micro-grid used for industrial area, namely the Tarnos area of the Bayonne harbor. The objective is to size the electrical sources of the micro-grid according with the harbor needs and test its dynamic operation. For these analyses, HOMER® and EUROSTAG® software have been used. © 2012 Dunarea de Jos University.

Terrasson G.,ESTIA | Llaria A.,ESTIA | Briand R.,ESTIA
2014 IEEE Faible Tension Faible Consommation, FTFC 2014 | Year: 2014

Recent advances in miniaturized sensors, low-power electronics and wireless communications have enabled the development of Body Sensor Networks (BSNs). These networks composed of intelligent communicating nodes are mainly dedicated to healthcare monitoring in order to study different pathologies or to detect and correct health problems. The objective of this article is to demonstrate the need of a system level dimensioning in order to design performing biomedical BSNs. Using the simulation tool OSCCAR developed by authors, this paper analyses the impact on the system performance of technology and strategy choice in early stages of BSN design flow, highlighting at the same time the need of a tradeoff between specifications such as Quality of Service and node autonomy. © 2014 IEEE.

Lafarge B.,ESTIA | Cagin S.,ESTIA | Curea O.,ESTIA | Perret A.H.,ESTIA
International Journal on Interactive Design and Manufacturing | Year: 2016

In the context of global energy demand increase, working on energy efficiency is essential. This paper deals with energy harvesting on car suspensions. In order to have a real added value, some criteria must be considered: the need to design a system that would be easily integrated into cars, the possibility to locally use the recovered energy to add new functionalities that can improve the security or the comfort of the car, and the necessity to not degrade and, if possible, to improve (semi-active or active dampers) the performances of the suspension. From the mechanical point of view, the functional analysis is used to define and to characterize the main suspension parts, to investigate the connexions and the energy flows and to identify the key elements for energy recovery. Then, quarter car and half car models implemented with Matlab/Simulink software are presented in order to evaluate the quantity of energy that could be recovered. Three locations are presented and evaluated. Simulations results will finally give an overview on the implementation opportunities. © 2015, Springer-Verlag France.

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