Boundary element simulations for local active noise control using an extended volume

This paper presents a novel local active noise control (ANC) approach formulated using a 3D fast Boundary Element Method (BEM). The proposed method can be easily implemented in a conventional ANC system. The unwanted noise is reduced in a predefined volume, called control volume (CV), by minimising the square modulus of two acoustic quantities, the pressure and one component of the particle velocity. Formulations are presented for one and two control sources. Simulations for both the formulations with various CV sizes, different locations of secondary sources-CV, and a large-scale engineering problem are presented. Practical aspects of the proposed procedure are also described.