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A BEM sensitivity formulation for three‐dimensional active noise control
Author(s) -
Brancati A.,
Aliabadi M. H.,
Mallardo V.
Publication year - 2012
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/nme.3369
Subject(s) - solver , boundary element method , sensitivity (control systems) , helmholtz equation , control volume , mathematics , residual , noise (video) , computer science , control theory (sociology) , mathematical optimization , finite element method , mathematical analysis , boundary value problem , algorithm , physics , engineering , mechanics , control (management) , electronic engineering , artificial intelligence , image (mathematics) , thermodynamics
SUMMARY In this paper, a novel boundary element formulation for sensitivity analysis of local active noise control in a three‐dimensional field is presented. The formulation is based on the Helmholtz differential equation and is valid for internal as well as for scattering wave propagation problems. The primary noise is attenuated within an enclosure, called control volume, by adding a control source modelled as an object with a vibrating surface. Both the optimum position of the control volume and the optimum location/orientation of the secondary source are determined by minimisation of a suitable cost function. The sensitivities are determined by implicit differentiation. A hierarchical adaptive cross approximation approach in conjunction with the generalised minimal residual solver is implemented to accelerate the convergence. Four numerical examples are presented to demonstrate the accuracy and efficiency of the proposed formulations. Copyright © 2012 John Wiley & Sons, Ltd.