The Laboratory of Systems Modelling and Dependability (LM2S) was set up in 1995. It was successively given Jeune Equipe (JE 1999) status in 1996 and became Equipe d’Accueil (EA 3173) in 2000. The Troyes Information Science and Technology Institute (ISTIT) came into being in 2004 when this team and two other UTT laboratories joined forces. It was immediately associated with the National Scientific Research Centre (CNRS) as a FRE (FRE 2732). Since 1 January 2006, all the UTT research teams have come together within the Charles Delaunay Institute, associated with the CNRS as a FRE (FRE 2848). The main objective of the new Institute is to share means and guarantee a better coherence in UTT research. This new structure also enables development of the teams which are part of it within the framework of their research into ‘Sciences and Technologies for Risk Control’.
The search for better performance, increasingly drastic security norms along with functionality and cost demands mean that the design and use of a system need to be apprehended globally. The system is no longer just fulfilling its initial mission. Now it must include extra functions in order to ensure monitoring according to the dependability characteristics expected. Firstly, in the design phase, nominal functioning respecting requirements must be guaranteed as well as an alternative in case of a breakdown in which these functions are lost. When in use, the evolution of the system must be monitored so as to detect and situate any possible breakdowns which need to be fought against by limiting their effects, by configuring the control architecture or by recommending maintenance action.
The LM2S researchers whose specialist areas cover decision, diagnostic reliability, and maintenance by essentially statistical approaches carry out research in the fields of function dependability at design phase (predicted reliability) and also the operational phase (maintenance), and process monitoring. They broach these questions with essentially statistical approaches.
These complementary themes which aim at developing an integrated design approach and the use of a complex system can be defined as follows. Monitoring is to detect and situate flaws, abnormal functioning modes, systems abuse then to give a diagnosis. More precisely, detection is to indicate a modification of the functioning state of a system. Localisation is to determine the type of breakdown while the role of the diagnosis is to identify its cause. The objective of dependability is identification, analysis, assessment and hierarchical organisation of breakdowns. Following the detection of a flaw, the information given by the study and by monitoring can be used in the search for a compromise between production demands and the interruption of a system because of maintenance and the continuation of use. In nominal functioning, maintenance operations can be planned according to monitoring results.
The strong point of LM2S are:
• To have within the Team specialists in Dependability and Systems Monitoring
• To be deeply involved in technology transfer, notably with PSA Peugeot-Citroën, Renault, Michelin, SNECMA, EDF, CEA, INERIS, …
• To be a central partner in GIS 3SGS (Systems Monitoring, Dependability and Security)