舰船辐射噪声特性重构技术

发布时间：2018-08-07 22:07

【摘要】：舰船辐射噪声是水下对抗最重要的物理场之一,并大量应用于水雷与反水雷装备中。为了对抗目标识别能力越来越强的声引信水雷,最有效的方法就是模拟被保护舰船的水下辐射噪声,使敌方水雷真假难辨。声场频谱特性是区分舰船类型和航速的主要依据,声场通过特性则反映了舰船由远及近通过测量点的动态过程。本论文以舰船水下辐射噪声为依据,重构其频谱特性和通过特性,回答了模拟什么和如何模拟这两个问题。论文重点研究声场频谱特性重构控制算法。简要介绍了舰船辐射噪声来源及基本特性,详细分析了频谱特性重构信息流程,利用回路时间来说明实时谱分析与控制的必要性。通过对四种经典功率谱估计算法的比较研究,选用Welch法周期图谱估计方法。提出了一种频谱特性重构控制算法,给出了一种改进型相位调制方法。仿真分析表明,该方法控制结果的谱线合格率更高、平滑度更好,有效地解决了由功率谱变为复傅氏谱的过程中如何添加相位的问题。仿真分析了谱线数、控制步长及平均帧数三种因素对控制谱线平滑度的影响,结果表明,谱线数越多、控制步长越小、平均帧数越多,谱线平滑度越好。给出了频谱控制系统中如何克服控制对象非线性带来的影响、如何得到级联设备的传递函数、如何通过测量谱生成控制谱等问题的解决方法,并在频谱特性重构信息流程和频谱特性重构控制算法的基础上,提出了频谱控制系统构建方案。
[Abstract]:Ship radiated noise is one of the most important physical fields in underwater countermeasure and is widely used in mine and anti-mine equipment. In order to counter the acoustic fuze mine which has more and more powerful target recognition ability, the most effective method is to simulate the underwater radiation noise of the protected ship, which makes the enemy mine difficult to distinguish. The spectrum characteristic of sound field is the main basis for distinguishing ship type and speed, and the passing characteristic of sound field reflects the dynamic process of ship passing from far and near measurement points. Based on the underwater radiated noise of ship, this paper reconstructs its spectrum characteristic and passing characteristic, and answers the question of what to simulate and how to simulate. This paper focuses on the reconstruction control algorithm for the spectrum characteristics of sound field. This paper briefly introduces the source and basic characteristics of ship radiated noise, analyzes in detail the information flow of spectrum characteristic reconstruction, and illustrates the necessity of real-time spectrum analysis and control by using loop time. Based on the comparison of four classical power spectrum estimation algorithms, Welch method is used to estimate the periodic spectrum. In this paper, a control algorithm for the reconstruction of spectrum characteristics is proposed, and an improved phase modulation method is presented. Simulation results show that the proposed method has higher pass rate and better smoothness, which effectively solves the problem of how to add phase in the process of changing power spectrum to complex Fourier spectrum. The influence of three factors, the number of spectral lines, the control step size and the average frame number, on the smoothness of the control line is analyzed by simulation. The results show that the more the number of lines, the smaller the control step, the more the average frame number and the better the smoothness of the spectral line. The methods of how to overcome the influence of nonlinear control object, how to get the transfer function of cascaded equipment and how to generate control spectrum by measuring spectrum in spectrum control system are given. On the basis of the information flow of spectrum characteristic reconstruction and the control algorithm of spectrum characteristic reconfiguration, the construction scheme of spectrum control system is put forward.
【学位授予单位】：中国舰船研究院
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U674.70

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