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Contrôle modal semi-actif et actif à faible consommation énergétique par composants piézoélectriques

Abstract : The control of vibrations has become a major issue in many industrial applications where the increase of lifetime is linked to the ability to reduce vibrations. In the case of onboard structures, vibrations must be efficiently damped while the weight and volume of controllers must be reduced. This can be achieved by minimizing or even bringing to zero the energy used by controls. In this case, piezoelectric ceramics such as sensors and actuators have been used. The advantages of piezoelectric materials include high achievable bandwidth, reliability, compactness, lightness and ease of implementation, thus making them well-suited to be used as actuators and sensors in the case of onboard structures. In order to reach performance and energy goals, a strategy consisting in using a semi-active modal control was developed. The proposed control is effictively a high-performance method for applications such as improving the lifetime of systems that use smart structures by concentrating control energy on damaging modes. The method is based on a semi-active method which is efficient when the excitation is located only on one mode of the structure. In order to target several modes when the structure is subject to wide bandwidth excitations, the proposed method uses a modal observer, a technique often used in active control. The observer requires the identification of the modal characteristics of the structure but nonetheless displays good stability and robustness. Damping performances of this modal method are warse than the active one. Nevertheless active control often requires heavy and cumbersome amplifiers which strongly limit the applications in the field of transportation. The proposed hybrid control associates the active control with modal semiactive control in order to benefit from the respective advantages of both methods. This hybrid method is intended to control vibration modes with the same damping performances than active control while reducing significantly the operative energy. An application on a clamped-free smart beam is carried out and an energetic balance-sheet is performed on the active order. A decrease in the power required by the control is achieved by the hybrid approach. This allows a decrease on the weight and volume of the active control devices. Therefore, this control can be used for example in the field of transportation to improve the lifetime of systems.
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https://tel.archives-ouvertes.fr/tel-00443734
Contributor : Jarir Mahfoud <>
Submitted on : Monday, January 4, 2010 - 11:18:33 AM
Last modification on : Wednesday, July 8, 2020 - 12:42:28 PM
Long-term archiving on: : Friday, June 18, 2010 - 12:15:08 AM

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  • HAL Id : tel-00443734, version 1

Citation

Stéphanie Harari. Contrôle modal semi-actif et actif à faible consommation énergétique par composants piézoélectriques. Mécanique [physics.med-ph]. INSA de Lyon, 2009. Français. ⟨tel-00443734⟩

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