【作者】 孙超； 刘月婵； 何元安；

【Author】 SUN Chao~1,LIU Yuechan~1,HE Yuanan~2 (1.Science and Technology on Underwater Acoustic Laboratory,Harbin Engineering University,Harbin,150001,China; 2.System Engineering Research Institute,Beijing 100036,China)

【机构】 哈尔滨工程大学水声技术重点实验室； 船舶系统工程部；

【摘要】 针对水下半自由场声源识别中存在界面反射干扰的问题,结合统计最优平面近场声全息(SOPNAH)的双面声场分离,提出了一种混合波叠加法的全息变换算法。首先采用SOPNAH的双面声场分离技术将自由场和反射场合成的空间声场分离,得到自由场信息,再通过波叠加方法(WSM)识别出噪声源。该方法不需界面反射系数的先验信息就可以精确的识别声源,进行声场重建,同时测量孔径也不必完全覆盖噪声源。可在半自由场条件下对任意形状物体进行噪声源识别。仿真结果表明,该方法可以精确的定位识别水下噪声源,工程中易于实施,有广泛的应用前景。更多还原

【Abstract】 Statistics optimal planar near-field holography(SOPNAH) of double layer sound field separation method is applied to identify noise source in underwater semi-free space for solving reflective interference.A holographic transform algorithm named hybrid wave superposition is proposed.Firstly,double layer sound field separation method based on SOPNAH is used for separating free space acoustical information from space sound field including free field and reflective field,and then the noise source is identified by wave superposition method(WSM).This method can improve the identification accuracy without prior information of the reflection coefficient.Noise source in objects with arbitrary shape can be identified on the condition of semi-free space.The simulation results show that the hybrid wave superposition method can oriented and identify the underwater noise source accurately.This method is easy to be implemented in engineering and can be applied broadly.更多还原