论文部分内容阅读
基于浅海波导中目标回声计算的射线声学方法,将数值模型推广到任意声速剖面的情况,发展了基于射线跟踪技术的浅海波导中复杂目标回声的数值计算方法。应用HAPRO声线模型跟踪计算本征声线,并结合板块元方法计算浅海波导中的目标声散射。算例比较了冬、夏两季典型声速剖面和细沙、黏土海底等不同浅海环境情况下的目标回声特性。计算表明,浅海波导中球体和横向放置的长圆柱体的等效目标强度ETS与自由空间中的目标强度TS很接近,声速剖面和海底底质对这类目标的ETS影响很小,传统意义上的声呐方程基本上成立。竖向放置的长度/波长比远大于1长圆柱以及benchmark潜艇等复杂形状目标的ETS与自由空间中的TS差别较大,传统的主动声呐方程存在较大误差。
Based on the ray acoustics method of target echo calculation in shallow sea waveguides, the numerical model is generalized to any sound velocity profile, and the numerical method of complex target echo in shallow sea waveguide based on ray tracing technique is developed. The HAPRO acoustic model is used to track and calculate the eigen sound ray, and the target acoustic scattering in the shallow sea waveguide is calculated by using the plate-element method. The case study compares the typical acoustic velocity profile in winter and summer, and the target echo characteristics under different shallow sea conditions such as fine sand and clay seafloor. The calculated results show that the equivalent target intensity ETS of the shallow cylinder waveguide and the laterally placed long cylinder is close to the target intensity TS in free space and the sound velocity profile and the seabed sediment have little effect on the ETS of such targets. Traditionally, The sonar equation is basically established. The difference between the ETS and the TS in free space for vertically oriented long cylindrical / semi-cylindrical submarines and for more complex shape targets is greater, and the traditional active sonar equations have large errors.