Energy Modelling of mechanical transmissions in general and gear transmission in particular

In this context, Research activity is focused on the development of digital models to estimate power losses in mechanical transmission systems, as well as the resulting increases in temperature. These models should be used as predictive tools in order to improve mechanical transmission efficiency, which can be mechanical gears (manual gear boxes, planetary gears etc) or mechanical guiding systems (ball bearings, lubricated bearings etc) for example. Particular attention is given to the power requirement for oil circulation for oil-bath lubrication. For this purpose, a specific test bench has been developed in the laboratory.

The chosen method to model heat exchanges is a nodal method, which allows “a strong connection” with the power loss calculation models, whilst still maintaining reasonable calculation times. This approach means that specific modelling codes, tailored to the different applications, can be developed.

Industrial partners include: PSA Peugeot Citroën, TOTAL, CETIM, SAFRAN, Flender-Graffenstaden, TIMKEN, Leroy Somer, VOLVO…

Advanced Regulation Techniques to manage thermal devices

This Research activity is aimed at improving the energy efficiency of thermal devices such as heat exchangers, refrigerating machines or industrial heaters. Here, it is not a question of changing the machine design, but of optimising its management in the given operational modes. Therefore, a predictive control method has been developed. This method is based on the physical modelling of the machine to be controlled, in order to determine the parameters necessary to create the controls. This method has been developed thanks to a laboratory test bench composed of heat exchangers. It has also been tested and validated on industrial refrigerating machines, on boilers and induction furnaces.

Industrial partners include: EDF, Schneider-Electric, SANOFI…

Energy performance modelling of electrical energy conversion and storage systems

This research axis is an extension of the method used for mechanical transmissions. It concerns the design and modelling by multiphysical analysis of energy conversion and storage electromechanical systems, such as generators, electric motors, converters or electrochemical storage systems. The models that have been developed are based on a thermo-electro-mechanical coupling enabling the prediction of the energy performance of these systems. These matrix methods (network method) can be completed by using local finite elements or volumes analyses (such as computational fluid dynamics – CFD – for example). An experimental approach is used to validate and, if required, adjust the modelling tools that have been developed.

Industrial partners include: Laboratoire AMPÈRE, Ansaldo Sistemi Industriali, Cysalys…