Conversion of an acoustically hard body into an acoustically transparent one in an initial-value problem

Arabadzhi, Vladimir V.

doi:10.1134/s1063771008060018

Cited by 4 publications

(2 citation statements)

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“…The new approach allows quick suppression of scattering fields with minimum information about the boundary problem. The one-sided direction of the radiation of Huygens' sources allows us to form the distribution of oscillatory velocities (or displacements), which we need, on the outside surface of an active coating, without inducing additional oscillations of the protected body [25,36,37]. At this point the analogy between Malyuzhinets's method and our approach is over.…”

Section: Joint Suppression Of Radiating and Scattering Field By A Coamentioning

confidence: 99%

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

Arabadzhi

2009

Algorithms

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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.

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Section: Joint Suppression Of Radiating and Scattering Field By A Coamentioning

confidence: 99%

“…represented by the prominent polygon with square σ k [37] and characteristic linear scale ~L V , satisfying the following conditions L V < λ min /2 and L V >> h r + 2h c . Within each equivalent piston S k (i.e.…”

Section: The Discrete Representation Of the Body Protection Surfacementioning

confidence: 99%

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

Arabadzhi

2009

Algorithms

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The Problem of Complete Damping of a Diffraction Sound Field for a Cylindrical Shell

Kosarev

2024

J. Mach. Manuf. Reliab.

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Experiments on Actively Suppressing Sound Reflection and Radiation by a Piston in a Water-Filled Pipeline

Mikhailov

2021

Acoust. Phys.

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Conversion of an acoustically hard body into an acoustically transparent one in an initial-value problem

Cited by 4 publications

References 1 publication

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

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

The Problem of Complete Damping of a Diffraction Sound Field for a Cylindrical Shell

Experiments on Actively Suppressing Sound Reflection and Radiation by a Piston in a Water-Filled Pipeline

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