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Contrôle de la propagation des ondes ultrasonores dans des cristaux phononiques piézoélectriques

Abstract : The ability to control the propagation of acoustic waves knows in recent years potential applications especially on the manufacture of electrical filter, but also in controlling the mechanical vibration of structures and sound insulation. To achieve this control, the properties of propagations can be changed by external load. The aim of this work is to achieve the control of acoustic waves in phononic crystal using piezoelectric materials. These materials have elastic properties coupled to the electrical properties resulting from their manufacturing process. The vibration of a piezoelectric layer is affected by the electrical boundary conditions imposed on its electrodes. A simple way to consider an electrical boundary condition on piezoelectrical material is to connect an external impedance load (positive capacitance, negative capacitance, inductance) to its electrodes. The resonance frequencies of the piezoelectric layer are then affected differently according the nature of external electric load. The positive capacitance allows to reduce the parallel resonance frequency. A negative capacitance makes it possible to increase the parallel resonance frequency of the piezoelectric layer, giving the ability to use the piezoelectric material away from away from its fundamental resonance frequency. The particular case of an inductive load has a wide possibility to control the propagation of acoustic waves through a piezoelectric pc. We demonstrate that the use of this inductive load opens a hybridization gap in a one-dimensional piezoelectric structure and enable to control the frequency position of this gap. As a result, the hybridization gap causes the opening of a bandwidth within the gap Bragg. The hybridization gap can also cause a high attenuation of acoustic waves in a pass band especially at low frequencies.
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  • HAL Id : tel-01623552, version 1

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Sid Ali Mansoura. Contrôle de la propagation des ondes ultrasonores dans des cristaux phononiques piézoélectriques. Acoustique [physics.class-ph]. Université du Havre, 2015. Français. ⟨NNT : 2015LEHA0027⟩. ⟨tel-01623552⟩

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