Ms. Stéphanie Harari Profile

Stéphanie Harari

at INSA de Lyon

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Publications (3)

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Proceedings Article | 7 April 2009 Paper

Enhanced piezoelectric voltage build-up for semi-active control of smart structures

C. Richard, S. Harari, L. Gaudiller

Proceedings Volume 7288, 72881Y (2009) https://doi.org/10.1117/12.813965

KEYWORDS: Switching, Actuators, Switches, Sensors, Smart structures, Capacitance, Phase shifts, Optical simulations, Amplifiers, Matrices

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This paper presents a combination of the SSD (Synchronized Switch Damping) semi-active control and techniques developed for active control. The principle of modal SSDI is to synchronize the piezoelectric voltage inversion or switching with the extremum of the targeted mode modal displacement. This modal displacement is estimated even in the case of complex, broadband or noisy excitation with a modal observer. The switching process control induces a non linear processing of the piezoelectric voltage which results in a cumulative self generated control voltage in phase with the mode speed, thus generating an important damping of the targeted mode. This voltage self building is optimal if the piezoelectric voltage is maximum when the modal displacement of the targeted mode is extremum. But in the case of complex excitation or when the targeted mode amplitude is lower than higher modes, the performances are altered. The proposed method consists in implementing a decision algorithm allowing waiting for the next voltage extremum before to trig the voltage inversion, the whole process being globally synchronized with the targeted modal displacement. Indeed, the targeted mode amplitude is reduced by using part of the energy of the higher modes which enhances the build up of the self generated piezoelectric control voltage. Simulations carried out on a clamped free beam are presented. Results obtained first with a bimodal excitation then in the case of pulse excitation demonstrates a large increase of the damping on the targeted mode.

Proceedings Article | 7 April 2009 Paper

Low energy multimodal semi-active control minimizing the number of transducers

L. Gaudiller, S. Harari, C. Richard

Proceedings Volume 7288, 72881X (2009) https://doi.org/10.1117/12.812249

KEYWORDS: Sensors, Actuators, Smart structures, Switches, Transducers, Feedback control, Signal attenuation, Control systems, Amplifiers, Inductance

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The new proposed method is the hybridization between SSDI techniques and active methods developed for modal active control such as time sharing control and modal observer in order to control several modes of a structure with a good performance but without operative energy. It is designed in order to minimize the number of control components. The principal application field is the transportation. It is based on several modal SSDI controllers which act on the same actuator voltage. They are synchronized on each extremum of the corresponding modal displacement. Modal displacements are reconstructed thanks to a modal model of the smart structure from a modal observer. In order to reduce the number of actuators, the time sharing method is adapted to SSDI techniques: all the modal SSDI are connected to the same piezoelectric actuator, but only one controller is selected to control the voltage inversion for each step time. In order to select modal SSDI controller having the most effective action for damping, a computation of modal energies is realized from the estimated modal state. A controller selector is used to connect the modal SSDI command, whose corresponding mode has the highest modal energy [6], to the switch trigger. An application on a smart clamped free beam including one actuator and two sensors is presented. Three modes are controlled and the modal responses are observed on five modes. The results show that the control reduces significantly the vibration of targeted modes. Moreover, the method is not subject to stability problems.

Proceedings Article | 7 April 2009 Paper

Hybrid active/semi-active modal control of smart structures

S. Harari, C. Richard, L. Gaudiller

Proceedings Volume 7288, 72881Z (2009) https://doi.org/10.1117/12.814094

KEYWORDS: Signal attenuation, Smart structures, Actuators, Amplifiers, Control systems, Sensors, Inductance, Switches, Vibration control, Switching

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Smart structures controlled by active algorithms proved their high efficiency. But active control requires external energy and heavy amplifier which strongly limit the applications in the transportation field. An alternative to active control is given by semi-active control which does not require operative energy but which is less efficient than active control. The proposed hybrid control associates the active control with semi-active control in order to benefit from the respective advantages of both methods. This hybrid control is intended to control vibration modes with the same performances than active control while reducing significantly the operative energy. An application on the second mode of clamped-free smart beam is presented. The results show that this new control approach appears to be able to decrease the required external energy and to reduce the power and consequently the weight of the active control amplifiers while maintaining the same damping performances. This control can be used, for example, in the transportation field to improve the lifetime of systems which use smart structure.

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