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Proceedings Paper

Computational simulation of active piezoelectric coatings with sensors and actuators applied in underwater acoustics
Author(s): Gui-Rong Liu; C. Cai; KwokYan Lam
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Paper Abstract

Control of the sound reflection from an underwater object is a very important issue. Active piezoelectric layers properly coated on the external surface of the object can control the reflection of incident sound waves. In many active control systems, a sensing device must be employed for the detection of the incident sound. The detected signal is then fed to properly controlled actuators to produce a sound wave to cancel the sound reflection. Multi-layered active coatings are therefore employed, which includes layers of acoustic sensor, layers of actuators and layers of encapsulant. The paper addresses the applications of the active acoustic coating with piezoelectric sensors and actuators for the cancellation of underwater sound reflection and transmission in the frequency domain. Computational techniques are reviewed on analyzing multi-layered active coating systems and on calculating the voltages required for the piezoelectric layers to cancel underwater sound reflections and/or transmissions. Non-reflective piezoelectric coatings are discussed for a oblique and/or normal plane sound wave incidence. The formulations such as surface impedance tensor approach and transfer matrix approach are introduced. They account for the complex interaction between the sound waves and the submerged active coating. The design criterion of imbedded sensors in the multi-layered active non-reflective coating is considered.

Paper Details

Date Published: 21 March 2001
PDF: 15 pages
Proc. SPIE 4235, Smart Structures and Devices, (21 March 2001); doi: 10.1117/12.420855
Show Author Affiliations
Gui-Rong Liu, National Univ. of Singapore (Singapore)
C. Cai, Institute of High Performance Computing (Singapore)
KwokYan Lam, Institute of High Performance Computing (Singapore)

Published in SPIE Proceedings Vol. 4235:
Smart Structures and Devices
Dinesh K. Sood; Ronald Albert Lawes; Vasundara V. Varadan, Editor(s)

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