Abstract：Regarding to the fact that the hydrodynamic characteristics of supercavitating torpedoes strongly depend on the supercavity envelops, this paper describes a high intensity underwater focused acoustic phased array used to remotely disrupt this envelope surface. First, the demand of designing an underwater focused acoustic phased array was discussed, and then an efficient sound field calculation formula for the convex spherical-section phased array was obtained. Furthermore, the sound focusing characteristics of above array were analyzed based on pseudo-inverse method. It is demonstrated, via simulation, that the arrays with minimum element size perform well on the intensity of focus pressure and the valid focusing region under the similar size of emission area. However, the change of valid focusing region is small when merely enlarge the aperture of array. And the possible application of multiple-focus pattern was investigated. Finally, the mechanism by which an imposed high-level sound field can countermeasure against supercavitating torpedoes was analyzed based on Logvinovich’s principle of independent cavity section expansion.
2012, Vol. 31 
