In this work an active control approach for radiated structure-borne sound reduction is proposed. The structure is an aluminum plate with free boundary conditions. The modal characteristics of the plate are found numerically and validated experimentally by an experimental modal analysis. Six piezoelectric patches are used as actuators and sensors and are analytically modeled and their position is found by a genetic algorithm optimum research, based on the modal properties of the structure. The acoustic properties of the structure, in terms of modal radiation efficiencies and average radiated power, are computed using the Rayleigh integral and averaging the effect of all the possible forcing position in order to remove the excitation dependence. The controlled configuration is experimentally tested in order to validate the analytic model of controlled structure. An optimal active control architecture is built using three Kalman filters and one linear quadratic regulator. The acoustic performance of the controlled strucuture are compared with the uncontrolled, and the control effort index is evaluated.
In questa ricerca viene proposto un metodo per il controllo attivo del rumore di tipo structure-borne. La struttura sotto esame é un pannello di alluminio con condizioni al contorno libere. Le sue carattericstche modali sono calcolate numericamente attraverso l'utilizzo di software agli elementi finiti, validate poi sperimentalmente attraverso analisi modale sperimentale. Gli attuatori e sensori utilizzati per il controllo sono sei cerotti piezoelettrici, il cui collocamento sulla struttura é stato ottimizzato tramite l'utilizzo di algoritmi genetici. Le proprietá acustiche della struttura sono calcolate tramite approccio alla Rayleigh, in termini di efficienze di radiazioni modali e potenza sonora media. Il modello numerico della configurazione controllata della struttura viene validato sperimentalmente. Un architettura di controllo attivo di tipo ottimo viene costruita usando tre filtri di Kalman e un regolatore lineare quadratico. Le proprietá acustiche della struttura controllata sono di nuovo valutate tramite approccio alla Rayleigh e confrontate con lo sforzo richiesto al controllore per ottenerle.
Active control of structure-borne sound of a thin plate
BONO, ENRICO
2015/2016
Abstract
In this work an active control approach for radiated structure-borne sound reduction is proposed. The structure is an aluminum plate with free boundary conditions. The modal characteristics of the plate are found numerically and validated experimentally by an experimental modal analysis. Six piezoelectric patches are used as actuators and sensors and are analytically modeled and their position is found by a genetic algorithm optimum research, based on the modal properties of the structure. The acoustic properties of the structure, in terms of modal radiation efficiencies and average radiated power, are computed using the Rayleigh integral and averaging the effect of all the possible forcing position in order to remove the excitation dependence. The controlled configuration is experimentally tested in order to validate the analytic model of controlled structure. An optimal active control architecture is built using three Kalman filters and one linear quadratic regulator. The acoustic performance of the controlled strucuture are compared with the uncontrolled, and the control effort index is evaluated.File | Dimensione | Formato | |
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https://hdl.handle.net/10589/133805