Browsing by Subject "optimal lq controller"

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Access status: Open Access ,
Model - based active noise control of a piezoelectric structure
(Wydawnictwa AGH, 2007) Nestorović, Tamara; Lef?vre, Jean; Gabbert, Urlich
Methods of active noise and vibration control involve different techniques which combine electroacoustics with integration of active materials and controller into a complex active structural system in order to enable radiation of an anti-phased field for cancellation or attenuation of an original noise in a specific domain. This paper presents a model-based controller design procedure for the active noise attenuation of a piezoelectric structure surrounded by the acoustic fluid. Model development is based on a finite element method approach, which takes into consideration the electro-mechanical-acoustic effects. A FEM-based state-space model obtained after appropriate transformations and modal reduction is used for the controller design. The aim of the control, suppression of the acoustic fluid pressure in a prescribed point or field, is achieved using an optimal LQ controller designed based on a developed state-space model. The controller design involves also a novel approach, with included additional dynamics for the noise control in the presence of periodic excitations. The effects of the suggested method are tested on a smart acoustic box consisting of an aluminium plate with attached piezoelectric patches, surrounded by the acoustic fluid (air) inside the wooden box. The air pressure reduction at a selected point inside the box is observed in the controlled case.