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Algorithms 2009, 2(1), 361-397; doi:10.3390/a2010361

Algorithm for Active Suppression of Radiation and Acoustical Scattering Fields by Some Physical Bodies in Liquids

Institute of Applied Physics, Russian Academy of Science, 603950 Nizhny Novgorod, Ulianov St. 46, Russian Federation
Received: 27 October 2008 / Revised: 8 January 2009 / Accepted: 8 January 2009 / Published: 4 March 2009
(This article belongs to the Special Issue Sensor Algorithms)
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Abstract

An algorithm for the suppression of the radiation and scattering fields created by vibration of the smooth closed surface of a body of arbitrary shape placed in a liquid is designed and analytically explored. The frequency range of the suppression allows for both large and small wave sizes on the protected surface. An active control system is designed that consists of: (a) a subsystem for fast formation of a desired distribution of normal oscillatory velocities or displacements (on the basis of pulsed Huygens' sources) and (b) a subsystem for catching and targeting of incident waves on the basis of a grid (one layer) of monopole microphones, surrounding the surface to be protected. The efficiency and stability of the control algorithm are considered. The algorithm forms the control signal during a time much smaller than the minimum time scale of the waves to be damped. The control algorithm includes logical and nonlinear operations, thus excluding interpretation of the control system as a traditional combination of linear electric circuits, where all parameters are constant (in time). This algorithm converts some physical body placed in a liquid into one that is transparent to a special class of incident waves. The active control system needs accurate information on its geometry, but does not need either prior or current information about the vibroacoustical characteristics of the protected surface, which in practical cases represents a vast amount of data. View Full-Text
Keywords: Protected body; active coating; piezoelectric materials; microphone groups Protected body; active coating; piezoelectric materials; microphone groups
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Arabadzhi, V.V. Algorithm for Active Suppression of Radiation and Acoustical Scattering Fields by Some Physical Bodies in Liquids. Algorithms 2009, 2, 361-397.

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