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Dynamique des rotors à très hautes vitesses et en régime non-stationnaire - Identification par le filtre de Kalman

Abstract : In the frame of the growing trend of promoting the carbon-free mobility, RedHV+ project is carried out in order to investigate whether or not it is possible to manufacture a high-speed and high performance gearbox compatible with car costs. As part of this project, a new dynamic model for very high speed rotors working at non-stationary operating conditions is proposed.First, the different assumptions used for rotordynamics modeling are separated into different categories and classified based on the order of complexity they add to the model. Then, according to the operating conditions of the RedHV+ test bed, a choice of the most realistic modeling assumptions is done. As a first step of the dynamic modeling, the work focused on monorotors. In this study, we suggest not to make any assumption on the angular speed. The rotor shaft is flexible in traction, bending and torsion. The energy source is assumed to be non-ideal and the angular displacement including both the rigid body motion and the torsional deformation is assessed. The dynamic model leads to a novel expression of the gyroscopic effect terms. It shows its capacity, through both its analytical expression as well as through numerical results, to accurately introduce the coupling between the flexural and torsional degrees of freedom. The results are presented at a first step, for a simple rotor made of a shaft, a disk and flexible support. Another degree of complexity is introduced later, by considering a geared parallel-rotor system. The aim is to improve the accuracy of simulations for the rotor dynamics in non-stationary conditions especially when getting through critical speeds.The study of geared systems mainly focuses on the dynamic modeling of a simplified architecture of the RedHV+ test bed. The results obtained using the new dynamic model show interesting conclusions regarding the vibration behavior of the rotor when crossing the critical speeds. The reached vibration levels, in the presence of elastic coupling, highlight the importance of a correct dimensioning of a rotating machinery going through critical speeds.Finally, an identification tool based on the Unscented Kalman Filter is developed in order to enrich the dynamic models of the rotating machineries with more realistic values of its uncertain parameters. The identification tool showed interesting results and it is shown that its performance increases when the rotor goes through critical speeds.
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Submitted on : Tuesday, July 7, 2020 - 10:35:06 AM
Last modification on : Wednesday, October 14, 2020 - 4:08:32 AM


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  • HAL Id : tel-02890956, version 2


Emna Sghaier. Dynamique des rotors à très hautes vitesses et en régime non-stationnaire - Identification par le filtre de Kalman. Mécanique des solides [physics.class-ph]. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPASC013⟩. ⟨tel-02890956v2⟩



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