Abstract
The results of a theoretical and experimental study of the impedance tuning capabilities of an electromechanical acoustic liner are presented. An electromechanical acoustic liner utilizes an array of Helmholtz resonators, each containing an electroactive, compliant-walled cavity, to couple the electrical, mechanical and acoustical energy domains. Due to this coupling, the acoustic impedance of this liner is a function of elements from all of these energy domains. Therefore, the acoustic impedance of the liner can be modified via an electrical network. In this study, a prototype of a single cell of an electromechanical acoustic liner is developed and tested. The prototype consists of a cylindrical Helmholtz resonator with a circular, piezoelectric composite backplate, consisting of a thin brass disk bonded to a disk of PZT. An electrical network of resistors, inductors, and capacitors was connected across the terminals of the PZT to implement tuning. Normal-incidence acoustic impedance measurements were taken in an impedance tube from 1 to 6.4 kHz for various values and combinations of electrical components. The measured impedance spectra are then compared to theoretical impedance spectra based on lumped element modeling.
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