This paper deals with the evaluation of power radiated by two monopoles locatednear a refl ective surface, especially in the case when one monopole-strength is actively controlled forthe minimisation of total radiated power. The radiated power and the optimal input for the controlledmonopole are derived analytically. It is found that the power output of an active noise controlsystem consisting of two point sources and located near a refl ective surface is dependent upon thesystem orientation angle. Based on the mechanism that the refl ecting surface can convert a dipolevertical to the surface into a longitudinal quadrupole, we demonstrate that the introduction of arigid surface to the active noise control system could further enhance the total power reduction.
|Journal||Australian Journal of Mechanical Engineering|
|Publication status||Published - 2008|