波浪起伏对噪声场空间特性的影响

发布时间：2018-08-02 09:09

【摘要】：风成噪声是海洋环境噪声的重要组成部分,现有的噪声预报模型基本都是基于海面为绝对软平坦边界的假设建立的,然而海面波浪起伏引起的散射必然造成声波能量的衰减,改变声场的空间分布。本文通过引进P-M波浪谱模型来描述海面粗糙度,利用小斜率近似求解二维粗糙海面下相干反射系数,然后将海面相干反射系数引入到声传播模型中,使得模型能够考虑界面粗糙对噪声传播的影响,基于简正波理论建立了粗糙界面下噪声场空间特性预报模型。仿真分析了海面粗糙度对噪声场空间特性的影响。结果表明:海面起伏会引起噪声强度的衰减,并影响空间相关函数的幅度,还会改变噪声场的水平相关半径。
[Abstract]:Wind-induced noise is an important part of marine environmental noise. The existing noise prediction models are based on the assumption that the sea surface is an absolute soft and flat boundary. However, the scattering caused by wave fluctuations on the sea surface will inevitably lead to the attenuation of acoustic energy. Change the spatial distribution of sound field. In this paper, the P-M wave spectrum model is introduced to describe the roughness of the sea surface, and the coherent reflection coefficient under the two-dimensional rough sea surface is solved by using the small slope approximation, and then the coherent reflection coefficient of the sea surface is introduced into the acoustic propagation model. The influence of interface roughness on noise propagation can be considered in the model. Based on the theory of normal wave, the prediction model of spatial characteristics of noise field in rough interface is established. The influence of sea surface roughness on the spatial characteristics of noise field is simulated and analyzed. The results show that the fluctuation of the sea surface will cause the attenuation of the noise intensity, affect the amplitude of the spatial correlation function, and change the horizontal correlation radius of the noise field.
【作者单位】：哈尔滨工程大学水声技术重点实验室;哈尔滨工程大学水声工程学院;
【基金】：国家自然科学基金项目(11474073)
【分类号】：P733.2

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