水下大型结构体中复杂噪声源定位、识别和分离方法研究

Analysis on the noise sources of large structure under water could be effective guidance for noise control, providing solid technical support for the development of the huge structure underwater with high acoustic stealth. Traditional analysis are mainly used for noise sources with low coherence, which have limited capability for the ones this high coherence. Large moving structure under water always has multi sources with high coherence with each other. This paper proposes a coherent sources analysis method for current noise measuring and vibration analysis system. The method conducted the coherent radiated sources positioning based on the passing characteristic measuring system, coherent sources analysis using mathematical characteristics of cepstrum, and also proposed an improved blind source separation method targeting to the transitivity of complex structure. With the three methods above, the coherent sources can be separated by current noise measuring system and vibration analysis system under water which established an improved noise sources analysis system. The method can be exerted in the analysis of mechanical radiated sources and vibration sources including large moving structure under water. It can guide the noise reduction more effectively, and also can be used in other field such as complex source analysis for the vehicles on the ground and aerocrafts.

对水下大型结构体噪声源的分析可以有效指导减振降噪工作的实施，为研制声隐身性较好的水下大型结构提供坚实的技术支撑。传统的噪声源分析方法大多针对相干性程度较低的声源，对相干程度高的声源分析能力有限。水下大型航行体的机械结构复杂，往往含有多个相干程度较高的辐射噪声源。为了更好的分析此类相干噪声源，提出了一种适用于现役噪声测量和振动分析系统的相干噪声源分析方法，系统的开展基于通过特性测量系统的相干辐射噪声源定位方法、利用倒谱数学特性的相干振动源分析方法、针对复杂结构的传递特性提出一种改进的盲源分离方法，最终实现利用现役的水下噪声测量系统和振动分析系统分离相干声源，构建更完善的噪声源分析系统。研究成果可直接运用于包括水下大型航行体在内的机械辐射噪声源和振动源分析，能够更有效的指导减振降噪工作的进行，同时在其它领域，如对地面车辆和飞行器的复杂声源分析也具有重要意义和推广价值。

对水下大型结构体噪声源的分析可以有效指导减振降噪工作的实施，为研制声隐身性较好的水下大型结构提供坚实的技术支撑。传统的噪声源分析方法大多针对相干性程度较低的声源，对相干程度高的声源分析能力有限。水下大型航行体的机械结构复杂，往往含有多个相干程度较高的辐射噪声源。为了更好的分析此类相干噪声源，本项目提出了一种适用于现役噪声测量和振动分析系统的相干噪声源分析方法，系统的开展了基于通过特性测量系统的相干辐射噪声源定位方法、利用倒谱数学特性的相干振动源分析方法，针对复杂结构的传递特性提出了一种改进的盲源分离方法，最终实现了利用现役的水下噪声测量系统和振动分析系统分离相干声源。 本项目的研究成果可直接运用于包括水下大型航行体在内的机械辐射噪声源和振动源分析，能够更有效的指导减振降噪工作的进行，同时在其它领域，如对地面车辆和飞行器的复杂声源分析也具有重要意义和推广价值。