船舶辐射噪声远场空间指向性

为了获得浅海波导条件下船舶辐射噪声的远场空间指向性,提出了一种由水听器获得的船舶辐射噪声近场声压数据,推算其远场辐射声压的方法,即由近场声压数据,反演出船舶辐射噪声源模型中的多极子强度和位置,然后利用简正波理论,计算该反演参数所对应的远场指向性.仿真计算过程中,将该方法获得的远场指向性与原假设声源直接计算的远场指向性进行对比.结果表明,该方法能有效的计算出船舶辐射噪声的远场空间指向性.

Spatial directivity of ship radiated noise at far field

In order to obtain the spatial directivity of ship radiated noise at far field in shallow water, a new method is presented to compute corresponding sound field distribution at far field. Which can be described as following: at first use the sound pressure data measured by hydrophone array at near field, to obtain the equivalent intensity and positions of multi-pole structure model for ship radiated noise , then the spatial directivity of far field radiated noise is computed by normal modes. A comparison between simulation results of far field spatial directivity of ship noise obtained by this method and the result obtained from direct computation using assumed data of sound sources show that the method presented in this paper can give an acceptable spatial directivity of far field.