舰船水下噪声中偏相干方法的应用─局部与系统的关系

Application of Partialcoherence for Underwater Noisefor Marine The Relation between a Part and System-The Relation between a Part and System

在舰艇水下噪声系统中，为预估降噪工程中一源替换的降噪效果，本文给出用偏相干方法处理问题的方法。先从变换角度给出偏相干方法，导出偏相干自谱和普通自谱的关系，及偏相干自谱对输出的贡献。从而导得在系统参数不变条件下输出的降噪效果与偏相于自谱改变的关系。

In order to estimate the effect of noise decreasing in replacing a source with other source for a marinenoise system, the method of partialcoherence is given in this paper. At first, from view point of transformation tooriginal inputs the method of paltialcoherence is presented, the relation between ordinaly autospectrum and partialcoherence autospecfrum is derived, and the contribution of partialcoherence autospectrum to output is calculated. Thereby the relation between effect of noise decreasing for output and decreasing of partialcoherence au tospectrum without changing of system parameters is derived.