关键词: 水下角反射器, 声反射性能, 泡沫塑料, 夹层

Abstract: For the unsatisfactory acoustic target strength and scattering stability of common underwater metal corner reflector, a method for improving the acoustic reflection performance of corner reflector by using low impedance foam interlayer was proposed according to the principle of water-reflector layer acoustic impedance mismatch, and a polyurethane foam interlayer plate was designed. Its acoustic reflectance was calculated, and was compared with that of monolayer metal plate in terms of frequency and incident angle. Based on this, a new polyurethane foam interlayer corner reflector is constructed. Considering the concave shape and submerged thin-wall structure of the underwater corner reflector, the acoustic scattering characteristics of the underwater foam interlayer corner reflector and the metal plate corner reflector are simulated and compared by using the finite element software ANSYS combined with the acoustic software SYSNOISE. Finally, the contrast experiments of the two kind corner reflectors were carried out in anechoic pool. The results show that the polyurethane foam interlayer corner reflector has better acoustic reflection performance than the metal plate corner reflector, and its target strength and scattering stability are better under the condition of the same side length.

Key words: underwatercornerreflector, acousticreflectioncapability, foam, interlayer