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This article deals with a diagnostic approach based on a predictive / conditional maintenance approach of a hydroelectric group. The technique used is based on the spectral analysis of the vibration signals, as well as on the orbital analysis of the bearings displacements. To do this, test protocols in different operating regimes are carried out, based on the collection of data measured according to the multisensor approach, the aim of which is to identify the predominant faults. The positions of the sensors are placed as close as possible to the bearings on the rigid structure of the hydroelectric group in accordance with the recommendations of standard ISO 10816-5. The evaluation approach is based on the analysis of the amplitudes of the vibration speeds, the aim of which is to identify the type of faults, as well as on the bearing displacement indicators in order to classify them in the pre-established zones according to thresholds recommended by the Standard. Therefore, a recommended tuning intervention can be planned in order to restore the unit to its proper operating condition, the aim of which is to increase its service life and improve fuel efficiency. Keywords—Diagnostic, Vibration analysis, Hydroelectric group, Multi-sensor approach, Standard

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Any study or project within the framework of system design has chosen to start the modeling phase with the model-based systems engineering approach (MBSE), it will encounter decision-making difficulties of the approach. to adopt. During the last two decades, many MBSE methodologies have been developed, but the majority of them present an incomplete or abstract architectural framework for organizing the modeling work. The MBSE Grid based Systems Modeling Language (SysML) approach has made the modeling task easier for system engineers. Indeed, SysML constitutes a powerful tool, using its diagrams, to model the points of view according to the principle of development of requirement, behavior or structure of the system. This paper summarizes the MBSE methodologies most used in research work and development projects. In the context of our study, the MBSE Grid approach is adopted with slight modifications concerning the names of the domains of the grid. By combining with Bombardier Transport SysMM's MBSE methodology, which consists of three main phases, the proposed MBSE grid presents a modeling approach by analysis: operational, functional and technical of the system. The purpose of this work is to conduct an operational analysis, for the implementation of a Health Monitoring and Management Unit (HMMU) of a hydropower group. Keywords—MBSE, MBSE Grid, Operational Analysis, SysML Hydroelectric group