基于表面贡献法的船壳远场声辐射热区识别

对舰船水下远场声场的声辐射热区进行识别可为后续降噪工作指明方向.舰船外壳表面振动的不同位置之间具有复杂相位关系,其近场声场和远场声场有很大不同,导致使用表面有功声强进行远场声辐射热区定位并不准确.本文尝试使用声能量表面贡献方法对某巡逻艇船壳表面的远场声辐射热区进行识别.表面贡献方法在振动结构表面构造了一个和位置相关的正值,表示对应小块面积对声场的绝对贡献.使用表面贡献方法,本文准确地标示出船壳表面的远场声辐射热区,这一尝试展现了表面贡献方法在舰船降噪中的应用前景.

Identification of hull's radiation hotspot to far-field based on the surface contribution method

The complex phase relationship that exists in the hull surface's vibration leads to a big difference between near-field and far-field of the acoustic radiation and inaccuracy of the identification of far-field sound radiation hotspot using surface active intensity. This work has tried to identify the hull surface radiation hotspot to far-field of a patrol ship using the surface contribution method of acoustic energy. For the surface contribution method, a position-related positive value is cre-ated at the surface of vibrating structure to represent absolute contribution of this piece of surface to acoustic radiation in the far-field. Based on the surface contribution method, the hotspot contributed to far-field is identified on the surface precisely, and it shows the possibility of applying the surface contribution method to noise control of ships.