机械振动信号盲源分离的时域方法

介绍盲源信号分离基本原理,分析了瞬态混叠模型和卷积混叠模型的特征,给出两个源信号独立性的评判准则,研究了盲分离正确性的评价误差函数,进行数值仿真,并用时域卷积瞬态混叠模型对实际机械振动信号进行源信号的盲分离。数值仿真和实际信号的分离效果较好,说明所用方法在机械振动信号盲源分离中的适用性。文中还分析了多源信号分离中所用方法的收敛性。

Blind Source Separation of Mechanical Vibration Signal in Time Domain

The basic principle of blind source separation is introduced,and the characteristics of the instantaneous mixing model and the convolutive mixing model are analyzed.Two independence criteria of source signal are proposed simultaneously.The estimate error function of correctness in blind source separation is researched.For real mechanical vibration signal,the convolutive instantaneous mixing model in time domain is used for blind separation of source signal,and a satisfied result is achieved.The astringency of the method in blind separation to multi-source signal is discussed finally.