In this paper a fast Boundary Element (BE) formulation for optimising a local Active Noise Control (ANC) strategy is presented. The Helmholtz differential equation is rapidly solved in a three-dimensional field using an Adaptive Cross Approximation (ACA) approach in conjunction with the Hierarchical matrix format and the GMRES solver. The noise is reduce in a local sense by attenuating a primary disturbance within a predefined volume, called control volume, utilising a control source modelled as an object with a vibrating surface. A sensitivity analysis is utilised to evaluate the optimum position of the secondary source and the control volume and the optimum orientation of the secondary source. The proposed formulation is valid both scattering and internal wave propagation problems. The accuracy and efficiency of the proposed formulation is demonstrated through example simulating real circumstances.
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