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Numerical modeling of electrical-mechanical-acoustical behavior of a lumped acoustic source driven by a piezoelectric stack actuator

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Author: Tajdari, F. · Berkhoff, A.P. · Boer, A. de
Type:article
Date:2016
Publisher: KU Leuven, Departement Werktuigkunde
Source:Sas, P.Moens, D.Walle, A. van de, 27th International Conference on Noise and Vibration Engineering, ISMA 2016 and International Conference on Uncertainty in Structural Dynamics, USD2016. 19 September 2016 through 21 September 2016, 1261-1275
Identifier: 762726
ISBN: 9789073802940
Keywords: Acoustic noise measurement · Acoustics · Actuators · Amplifiers (electronic) · Electric power systems · Mechanical actuators · Piezoelectricity · Recovery · Structural dynamics · Acoustic sources · Analogue amplifiers · Piezoelectric elements · Piezoelectric stack actuators · Quasi-static regime · Radiation efficiency · Reactive components · Switching amplifiers · Acoustic noise · Observation, Weapon & Protection Systems · AS - Acoustics & Sonar · TS - Technical Sciences

Abstract

The present work describes the electrical, mechanical and acoustical behavior of a thin honey-comb structure as an acoustic source. The acoustic source has to operate in the low frequency, quasi-static regime and is driven by a piezoelectric stack actuator. In addition, a two-way energy flow between the actuator and a connected amplifier is investigated. In particular, the effectiveness of energy recovery from the reactive components of the acoustic source is evaluated to improve the overall radiation efficiency. A lumped model is used to represent the acoustic source that is excited by a stacked piezoelectric element. The required power supply and resulting radiation efficiency are evaluated when a conventional nalogue amplifier is used. The result is compared to the case in which some parts of the stored power are recovered and sent back to the connected switching amplifier. The study reveals 20% increase in the radiation efficiency and more than 80% decrease in the amount of required input power through recovering the reactive power in the system.