HYDROACOUSTICS
ANNUAL JOURNAL |
START | NEW VOL 20 | SEARCH | STATISTICS | PAS - GDANSK DIVISION |
pp. 163-170, vol. 15, 2012 Łukasz Nowak Institute of Fundamental Technological Research, Polish Academy of Sciencess, Warsaw, Poland Tomasz G. Zieliński Institute of Fundamental Technological Research, Polish Academy of Sciencess, Warsaw, Poland Key words: numerical investigation; transducer Abstract: The paper presents results of the theoretical and numerical investigation on acoustic radiation of vibrating plate structures submerged in water. The current state of the art on the
considered issues is briefly reviewed. Then, the method for determining eigenmode shape
functions and eigenfrequencies of plate vibrating in water that has been used in presented
study is introduced. The constitutive equations for solid domain and the pressure acoustic
equation for liquid domain are coupled via boundary conditions and solved numerically using
the finite element method. Structural mode shapes and eigenfrequencies computed for plate
submerged in water are compared to analogous results obtained for air and for the in vacuo
case. It is assumed, that the plate is rectangle shaped and that it is placed in an infinite rigid
baffle. Three-dimensional near- and far-field acoustic radiation characteristics for the plate
vibrating in water are introduced. Possibilities of implementation of the active control system
for reduction of the hydroacoustic emission are briefly discussed.
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