National Engineering School of Tarbes

www.enit.fr
Tarbes, France

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Grant
Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: AAT-2007-4.1-05 | Award Amount: 6.75M | Year: 2008

ACCENT addresses the relevance to the call 7.1: Aeronautics and Air Transport by Improving Cost efficiency and quality of safety critical aircraft engine components. The manufacture of safety critical rotating components in modern aero engines is by nature very conservative. In order to achieve the required engine performance, thermal and mechanical stresses are pushed to the maximum, which in turn leaves the choice of materials to exotic super alloys. These materials are classed as difficult to machine under normal circumstances, but when added to the changes in mechanical properties which occur naturally from part to part, consequently variable and often unpredictable tool life, and the ever present possibility of random and unexpected process anomalies, machining processes can never be fully optimised. Stringent legislative controls are placed on safety critical component manufacture to ensure that parts entering service will function correctly and safely to a declared service life, and in declaring the service life for such a part, the machinability issues stated above have to be taken into consideration. Hence manufacturing process parameters are often reduced or tools are changed early to ensure part surface integrity. The industry method adopted, is to freeze to process following process qualification to first article inspection, and successful part validation via laboratory examination and testing. Once frozen, no changes to process parameters are permitted without time consuming and costly re-validation. ACCENT will allow the European Aero Engine manufacturers to improve their competitiveness by applying adaptive control techniques to the manufacture of their components. Being able to adapt the machining process to the constantly changing tool and component conditions whilst operating in a multi-dimensional approved process window, processes will be optimised to the prevailing conditions and no longer frozen.


Grant
Agency: European Commission | Branch: FP7 | Program: CP-IP | Phase: AAT.2012.1.4-2. | Award Amount: 30.14M | Year: 2012

Future aero engines will need to be more efficient and contribute to the reduction on environmental impact of air transportation. They must reach some standards of performance by reducing emissions and creating some savings on operation costs. EIMG consortium has launched since several years some initiatives to develop future engines in the frame of the European Committee research programmes. Within different project such as DREAM, VITAL, NEWAC or LEMCOTEC, EIMG is ensuring the development of innovative technologies in order to further reduce the fuel burn, emissions and noise. In order to ensure the technological breakthrough, future aero-engines will have higher overall pressure ratios (OPR) to increase thermal efficiency and will have higher bypass ratios (BPR) to increase propulsive efficiency. These lead to smaller and hotter high pressure cores. As core engine technologies have been addressed in the previous project, E-BREAK project will ensure the mandatory evolution of sub-systems. It is indeed required for enabling integration of engine with new core technologies to develop adequate technologies for sub-systems. E-BREAK will aim to adapt sub-systems to new constraints of temperature and pressure. The overall picture of these initiatives bring all technology bricks to a TRL level ensuring the possibility to integrate them in a new aero engines generation before 2020. In its 2020 vision, ACARE aims to reduce by 50% per passenger kilometer CO2 emissions with an engine contribution targeting a decrease by 15 to 20% of the SFC. NOX emissions would have to be reduced by 80 % and efforts need to be made on other emissions. E-BREAK will be an enabler of the future UHOPR integrated engine development, completing efforts done in previous or in on-going Level 2 programs.


Kamsu-Foguem B.,National Engineering School of Tarbes | Foguem C.,University of Burgundy
European Research in Telemedicine | Year: 2014

In developing countries, telemedicine and mobile health tools promise to enhance access to high-quality healthcare, to support communication of medical information and to assist pharmacovigilance processes. In this article, we provide some arguments on the potential of telemedicine and mobile health (mHealth) applications to improve the delivery of health care in rural African regions. Specifically, the development of mobile telemedicine could help to lay the foundations of a healthcare approach integrating modern medical knowledge with ancient medical practices on the African continent. Access to information and communication technology (ICT), technical devices or portable media in developing countries is increasingly widespread. This can foster a complementary approach to healthcare, namely in African homebased care (AHC), in which the practice of conventional medicine takes place in an environment where belief in traditional medicine is strong. In the AHC, there are community volunteers who provide primary care and link patients with qualified medical personnel working in the nearest clinics and hospitals. These volunteers have contextual knowledge that is at the frontier of modern and traditional medicine, strongly influencing their practical approach to healthcare. The article proposes an interesting holistic look at potential applications of telemedicine in this context and examines in particular therapeutic and preventive education of toxicological aspects of medicinal plants and communication about the potential side effects of these plants. © 2014 Elsevier Masson SAS. All rights reserved.


Grant
Agency: European Commission | Branch: FP7 | Program: JTI-CS | Phase: JTI-CS-2012-1-SAGE-02-015 | Award Amount: 198.00K | Year: 2012

This topic aims to develop an optimized manufacturing process for the Open-Rotor demonstrator deicing system electrical machine based on organic matrix composite material processing technologies. The different tasks will design the manufacturing process, select the resin and optimize its process parameters, and then manufacture a demonstrator of an electrical machine. This advanced manufacturing will be based on composite material process technologies developed at Nimitech Composites with optimized process parameters and defect investigation determined at Ecole Nationale dIngnieurs de Tarbes.


Karama M.,National Engineering School of Tarbes
Structural Control and Health Monitoring | Year: 2011

The dimensioning of structures depends on the nature of the loading to which they are subjected. Load may be constant or, more generally, variable over the course of time. Take, for example, automobile suspension parts or the wings of a plane; their degree of stress in use varies. In fact, the phenomenon of fatigue concerns each object which surrounds us, and repeated use leads to their deterioration. Repetitive use and loading levels are determining parameters with regard to the lifespan of these elements, i.e. the period during which they function correctly. The main reason mechanics lack motivation for fatigue testing is the high cost of such tests. This is due, amongst other things, to the particularly dispersive character of the fatigue phenomenon and to the duration of the tests themselves. For each type of experimental checking in fatigue, this wide dispersion makes a considerable number of tests necessary in order to obtain representative results. Following up damage to the specimens according to the number of cycles in order to quantify the lifespan of the material was done using an infrared camera to evaluate the variation in temperature during the fatigue test. An approach to fatigue damage mechanisms, based on the treatment of dissipation images, is given. The endurance limit, obtained by energy method, is also shown. © 2011 John Wiley & Sons, Ltd.


Rotella F.,National Engineering School of Tarbes | Zambettakis I.,University Paul Sabatier
Automatica | Year: 2011

A constructive procedure to design a single linear functional observer for a time-invariant linear system is given. The proposed procedure is simple and is not based on the solution of a Sylvester equation or on the use of canonical state space forms. Both stable observers or fixed poles observers problems are considered for minimality. © 2010 Elsevier Ltd. All rights reserved.


Potes Ruiz P.A.,National Engineering School of Tarbes | Kamsu-Foguem B.,National Engineering School of Tarbes | Noyes D.,National Engineering School of Tarbes
Knowledge-Based Systems | Year: 2013

Distributed environments, technological evolution, outsourcing market and information technology (IT) are factors that considerably influence current and future industrial maintenance management. Repairing and maintaining the plants and installations requires a better and more sophisticated skill set and continuously updated knowledge. Today, maintenance solutions involve increasing the collaboration of several experts to solve complex problems. These solutions imply changing the requirements and practices for maintenance; thus, conceptual models to support multidisciplinary expert collaboration in decision making are indispensable. The objectives of this work are as follows: (i) knowledge formalization of domain vocabulary to improve the communication and knowledge sharing among a number of experts and technical actors with Conceptual Graphs (CGs) formalism, (ii) multi-expert knowledge management with the Transferable Belief Model (TBM) to support collaborative decision making, and (iii) maintenance problem solving with a variant of the Case-Based Reasoning (CBR) mechanism with a process of solving new problems based on the solutions of similar past problems and integrating the experts' beliefs. The proposed approach is applied for the maintenance management of the illustrative case study. © 2013 Elsevier B.V. All rights reserved.


Kamsu-Foguem B.,National Engineering School of Tarbes
European Research in Telemedicine | Year: 2014

The complexity of the health care system is a particularly notable framework for the development of telehealth and telemedicine. It is therefore necessary to try to answer the relevant question that can be summarized broadly as "How to manage this complex system?" We will discuss here the relations between system engineering and telehealth, or more specifically how systems engineering can be applied in the design of a telehealth system, and what benefits it can bring in its development. This naturally leads us to think of methods you can use to understand the difficulty of decision-making and the conceptual perspectives. It has been an accepted fact that this first requires modeling, i.e. to construct a representation of the perceived reality through symbols and relevant rules, then to verify or validate in absolute terms this representation, model, so as to improve or be able to use it. The importance of this modeling and the rigorous analysis of the requirements of telemedicine systems are even more apparent since the recognition of the generic representation declined in two meta-models: the first covers the activities of teleconsultation, teleexpertise and teleassistance; the second concerns telemonitoring. © 2014 Elsevier Masson SAS. All rights reserved.


Kamsu-Foguem B.,National Engineering School of Tarbes
European Research in Telemedicine | Year: 2014

The verification and validation of information system models impact on the adequacy and appropriateness of using the value of telemedicine services for continuously optimizing healthcare outcomes. We have defined a methodology to help the modeling and rigorous analysis of the requirements of information systems in telemedicine. On one hand, this methodology will be based on a formal representation of requirements (systemic, generic domain, etc.) within a knowledge base that will be a requirements repository. On the other hand, this methodology will use conceptual graphs for the formalization of ontology of activities and the production of arguments related to the formal verification of models built from this ontology. We describe an example illustrating the engagement of conceptual graph procedures to model the contextual situations in the telemedicine development. We also discuss the way in which ethical issues will actually take place in telemedicine applications. © 2014 Elsevier Masson SAS. All rights reserved.


Rotella F.,National Engineering School of Tarbes | Zambettakis I.,National Engineering School of Tarbes
IEEE Transactions on Automatic Control | Year: 2013

The technical note deals with existence conditions of a functional observer for linear time-varying systems in the case where the order of the observer is equal to the number of observed variables. Constructive procedures for the design of such a linear functional observer are deduced from the existence conditions. As a specific feature, the proposed procedures do not require the solution of a differential Sylvester equation. Some examples illustrate the presented results. © 2012 IEEE.

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