Control of Scattering Sound Field from a Cylindrical Shell Using Beam Deflection

For the current field of underwater acoustic stealth, the passive methods such as acoustic absorption materials are extensively used. However, the performance of such passive stealth method is seriously degraded at low frequencies. Therefore, active stealth methods, which control underwater sound field by actively transmitting sound signals using secondary sources, have attracted increasing attention. The paper focuses on the control of target scattering field and a method for underwater sound field control is presented. Simulation is performed using finite-element method and proves that the proposed method is effective to directionally control the scattering field of a steel shell. Finally, an experiment was conducted in an anechoic tank. The experimental results show that the proposed method can greatly weaken the specified directions of the scattering field of the steel shell.