TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE

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ISSN (print) 2542-2324 /(online) 2618-8244


Articles of The Transactions of KSRC








The estimation of sound directivity, radiated by vibrating bodies, on a base of energetic model



Full text article (in russian)

Year

 
2012

Issue

 
355

Volume

 
6

Pages

 
183–196

Caption

 
The estimation of sound directivity, radiated by vibrating bodies, on a base of energetic model

Authors

 
A. Gladilin, V. Stepanov, V. Litvinov

Keywords

 
vibration, distribution on bodie’s surface, sound radiation, angular patterns estimation, near and far wave zones, energetic model

Summary

 
The model is proposed, which allow to calculate the angular sound intensity distribution on a base of energetic characteristics of the vibratory field distribution on the radiating surface – such as wave-spatial energetic spectral density of the vibration and it’s correlation function. The expressions are obtained for the radiated intensity estimation in the cases of a plane and circular cylindrical surfaces. The example is given to demonstrate the radiated field angular pattern evaluation for near and far wave zones in the case of multi-section cylinder with different levels of uniform sectional vibration. The distance of stable angular diagram formatting is evaluated. It is shown, that this distance is much nearer in comparison to the classical theory estimation. The equivalent plane model is also proposed to calculate the radiated sound angular distribution for bodies with curved surface of complex shape. The calculation on a base of equivalent plane model is demonstrated for the cylinder with non-uniform circular vibration distribution. The error is estimated, when real curved surface is replaced with the plane model. The conclusion is given, that relative simplicity of the method proposed makes it useful to product engineering estimations of the radiated sound field angular distribution.

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