起伏海面水面船回声强度预报方法及统计规律研究  

Echo strength prediction method and statistical regularity of surface ship on fluctuant sea surface

作　　者：柴鹏程 彭子龙[1] 范军[2] 俞强 王斌[2] CHAI Peng-cheng;PENG Zi-long;FAN Jun;YU Qiang;WANG Bin(Jiangsu University of Science and Technology,Zhenjiang 212100,China;Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]江苏科技大学,江苏镇江212100 [2]上海交通大学,上海200240 [3]上海海事大学,上海201306

出　　处：《船舶力学》2023年第4期607-616,共10页Journal of Ship Mechanics

基　　金：水下测控技术国防科技重点实验室基金项目(6142407180205);江苏省自然科学青年基金项目(SBK20200995);国防科技基础加强计划技术领域基金项目(2020-JCJQ-JJ-228);国家自然科学基金项目(52201397,11774229)。

摘　　要：本文基于随机起伏水面舰船目标六自由度动力学模型和界面附近目标多路径声散射理论,考虑水面多次反射的影响,建立时变海面条件下水面舰船声散射预报模型,分析不同海浪谱条件下水面舰船回波强度统计规律。通过开展拖曳水池造波条件下舰船缩比模型声散射试验,获取舰船模型在水平探测角上时域回波特征。研究表明:120~180 kHz探测频段下回声强度理论预报幅值与实测结果平均误差小于3 dB;从舰船模型声散射实测和计算结果中均发现,波浪作用下舰船随时间变化的回声强度幅值符合χ^(2)分布的统计规律,其回声强度均值和双自由度数值k符合较好,验证了预报模型的有效性。Based on the six-degree-of-freedom(DOFs)dynamic model of warships on the sea surface with random fluctuations and the theory of multi-path acoustic scattering of warships near the interface,a predic⁃tion model of acoustic scattering of warships on the sea surface under time-varying conditions was estab⁃lished considering the effect of multiple reflections from the sea surface.Then the statistical regularity of war⁃ship echo strength(ES)under different wave spectra was analyzed based on Monte Carlo method.The acous⁃tic scattering experiments of the warship model were carried out in a towing tank to obtain the time domain echo characteristics of the warship model for the horizontal detection.The results show that the average error of ES between the prediction and the measurement is less than 3 dB when the detecting frequency ranges from 120 kHz to 180 kHz.It is found that the ES of warship model under the action of waves conforms to the statistical regularity of Chi-Square distribution with time.The mean value of ES and the numerical value k of two degrees of freedom are in good agreement,which proves the validity of the prediction model.

关 键 词：起伏海面 声散射 水面舰船 统计规律 

分 类 号：TB566[交通运输工程—水声工程]