Active sound control in 3D bounded regions

•Active sound control in the 3D bounded domain is considered, including wanted sound.•The noise source or transmission path data is not needed to obtain the solution.•The controls, located at the boundary, cancel the noise but preserve the wanted sound.•If wanted sound is present, it is doubled outside the shielded region.•The noise reduces by 2.5 dB if the number of controls doubles in each direction.

We consider active sound control with the preservation of wanted sound in 3D bounded regions via numerical experiments. In contrast to some previous papers which are based on the difference potential method, our approach in the present work is based on surface potentials. In active sound control, some bounded domain is shielded from noise generated outside by situating additional sources at the perimeter of the domain to be protected. The method does not require knowledge of the source of noise (nature, location, and intensity). The approach allows the presence of wanted sound in the shielded domain, which is preserved, while the noise is canceled. To implement the method, the only required knowledge is the total acoustic field at the perimeter of the shielded domain. A number of test cases in different 3D bounded domain configurations are considered in the frequency domain. Furthermore, for the first time the effect of the number of secondary sources on the noise cancelation is studied. A significant level of volume noise cancelation is achieved at most parts of the shielded domain.