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侧面波作为近距离声场的重要成分,因其现有近似公式误差过大而给近距离声场分析和预报引入较大误差.针对Pekeris波导,在推得矢量场积分公式基础上,经严格的围道积分分析,推得侧面波矢量场积分公式,并对其设计了快速数值积分算法.该算法将侧面波原来的计算精度提高了1~2个数量级.数值分析表明,侧面波声压场与矢量场具有相近的衰减规律:相对于海深的近距离内,衰减率接近球面波;中等距离衰减率近3倍于球面波;远距离衰减率2倍于球面波.在几倍于海深的距离内,侧面波占总声场的主要成分.海试结果与声场理论预报接近,初步验证了该算法的正确性.
As the important component of the close-range sound field, the side wave has a large error due to the large error of the approximate formula.For the Pekeris waveguide, based on the integral formula of the vector field, Integral analysis of the wave field and the integral formula of the lateral wave vector field are introduced and a fast numerical integration algorithm is designed. The calculation accuracy of the side wave is improved by 1-2 orders of magnitude. Numerical analysis shows that the relationship between the surface acoustic wave pressure field and The vector field has the similar decay law: the decay rate is close to the spherical wave in the short distance with respect to the sea depth; the attenuation rate in the middle distance is nearly 3 times that of the spherical wave; the decay rate in the long distance is 2 times the spherical wave. The inner and the side waves occupy the main components of the total sound field.The results of the sea trial are close to the prediction of the sound field theory, which proves the correctness of the algorithm.