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Proceedings Paper

Architecture definition of a piezoceramic-based ANN system for multiple-tone vibration suppression
Author(s): Antonio Concilio; Luciano De Vivo; A. Sorrentino
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Paper Abstract

The capabilities of a system developed on the basis of ANN are preliminarily evaluated, in suppressing the vibration field related to a general structural element; to this introductory aim, a numerical FE-model of a flat plate, part of an acoustic box for technology demonstration of architectures for sound radiation reduction, is referred to. The aluminum panel is excited by a 2-tonal point force, with the main peak at 50 Hz. The force may vary in frequency and amplitude (+/- 2% and +/- 10%, respectively). The time delay, between the two components of the signal is considered time-varying. A control system referring to 4 piezoelectric ceramic actuators and 8 accelerometers is used to minimize the vibration field; the placement of the different devices is defined by means of a proper tool based on Genetic Algorithms, and able to consider both the investigated frequencies; time delay (or phase shift), is not take into account in this process. An arbitrary signal, simulating the corresponding reference for the vibration suppression system, is transmitted to an ANN-based observer, aimed at identifying all the characteristic values, namely the amplitudes, the frequencies and the time shift. A classic feed-forward type minimization algorithm, ANN-based, is implemented. The identified solution is validated by means of a FE simulation, developed in the time domain, where the disturbance force is acting with the true values of the component sinusoidal forces (amplitude and frequencies), shifted by the correct value of the imposed phase. To have a first estimate of the capability of the proposed architecture in following the signal variations, a new signal is given to the ANN identifier, and the whole process is repeated.

Paper Details

Date Published: 9 June 1999
PDF: 12 pages
Proc. SPIE 3668, Smart Structures and Materials 1999: Smart Structures and Integrated Systems, (9 June 1999); doi: 10.1117/12.350705
Show Author Affiliations
Antonio Concilio, Italian Aerospace Research Ctr. (Italy)
Luciano De Vivo, Italian Aerospace Research Ctr. (Italy)
A. Sorrentino, Italian Aerospace Research Ctr. (Italy)

Published in SPIE Proceedings Vol. 3668:
Smart Structures and Materials 1999: Smart Structures and Integrated Systems
Norman M. Wereley, Editor(s)

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