舰艇辐射噪声源分离方法研究

介绍一种从舰艇辐射噪声数据中分离辐射噪声源的方法.根据不同噪声源的特征,将辐射噪声1/3倍频程谱级数据按螺旋桨噪声变化规律归一化处理来实现分离.引入无量纲频率和修正系数,给出了各工况在整个频率范围的通用归一化关系式.对艇体噪声参与形成低频辐射噪声情况,论述了螺旋桨与艇体噪声的分离原理,并采用数学逼近方法确定了艇体噪声贡献.通过确定各航速时螺旋桨噪声作用,从而实现不同噪声源的分离.

Study of separation method of naval ship radiated noise sources

A separation method of naval ship radiated noise sources using measure data of radiated noise was introduced. According to different characteristics of each noise source, separation of noise sources was completed by normalized process of 1/3 octave spectral level data of radiated noise in conformity to propeller noise regulations. By introducing non-dimensional frequency and corrected coefficients, a common formula used for normalized process at different velocities was erected in whole frequency. The basic principle of low frequency radiated noise separation formed by propeller and naval ship body was discussed in theory,and action of naval ship body noise was calculated through a mathematical approach method. This method first determines the action of propeller noise and then completes separation of noise sources.