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Contribution à la compensation active des vibrations des machines électriques

Abstract : This work is devoted to elaborate an active control system of rotating machine vibrations. It is based on additional currents supplying the stator coils of the machine. They generate radial forces on the stator frame,
and finally create additional vibrations which interact with the machine ones. Therefore, the aim of this system is to process the optimal value of the input currents, in order to minimize the vibration signals power measured on the stator frame by several accelerometers.
First, the transfer function between the input currrents and the engendered vibrations is modelized by a linear and periodically time-varying (LPTV) system. Moreover, its fondamental frequency is shown proportional to
the machine rotating frequency.
Applied to the present problem, classical active control methods reach middling performance, a theoritical study of LPTV systems is thus realized. It leads to the definition of a transfer matrix, having the same
properties than the classical transfer function used for linear and time-invariant systems. By using this matrix, a simple frequency relation can be obtained linking inputs and outputs of a LPTV system.
Then, previous results are used to determine the optimal value of the input currents minimizing the power of the measured vibration signals. Moreover, an adaptive algorithm permits to reach this optimum and to
take into account some potential variations of the vibratory disturbances. The performance obtained by this processing are illustrated thanks to simulations on synthetic and real data. The synchronous vibrations with
the machine rotation are significantly reduced, unlike the asynchronous ones, which are left unchanged. The real-time implementation of this algorithm is finally described and realized thanks to a digital signal processor.
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Submitted on : Tuesday, September 26, 2006 - 5:10:56 PM
Last modification on : Friday, November 6, 2020 - 3:50:28 AM
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Pierre Granjon. Contribution à la compensation active des vibrations des machines électriques. Traitement du signal et de l'image [eess.SP]. Institut National Polytechnique de Grenoble - INPG, 2000. Français. ⟨tel-00101286⟩

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