敷设吸声材料复杂目标的目标强度计算

Target Strength Calculation of Underwater Complicated Targets Coated with Absorbing Materials

研究敷设吸声材料复杂目标的目标强度的计算方法.利用ANSYS建立水下复杂目标的数值模型,利用传递函数得到模型敷设吸声材料前后的反射系数,根据非刚性表面目标特性计算的板块元方法计算复杂目标敷设吸声材料前后的目标强度.结果表明：在1~30 kHz低频时,水下复杂目标敷设吸声材料对于降低目标强度的效果不明显;而随着频率的增大,敷设吸声材料后的目标强度降低值越大,吸声材料的作用也越明显.

The target strength of underwater complicated targets coated with absorbing materials was calculated by the planar element method which is suitable for the objects with nonrigid surface. In the calcula- tion, numerical models of underwater complicated targets were built by the software of ANSYS, while the reflection coefficient was obtained by transfer function. From 1 kHz to 30 kHz, the target strength of the model was compared with that of the model coated with absorbing materials. The results show that the absorption effect is not obvious for the targets coated with absorbing materials at low frequencies. However, the absorption effect increases with the frequency increasing, that is to say, the absorption effect is more obvious for the targets coated with absorbing materials at higher frequencies.