基于Ma lla t 塔式算法小波变换的多故障诊断方法

提出一种用Mallat金字塔算法的小波多分辨率分析技术对系统进行多故障诊断的方法，首先利用小液交换的多分辨率分析的特点，对系统的状态信号进行多尺度分解；然后根据其在不同尺度下的高频分量的小液系数模极大值和不同尺度的模极大值所在小波系数序列的对应关系进行多故障诊断，同时对故障的信息提取给出了相应的方法，仿真结果证实了该方法的有效性和可行性。

Multi-fault diagnosis method on Mallat pyramidal algorithm wavelet analysis

A method for multi-fault diagnosis based on wavelet multiresolution in Mallat pyramidal algorithm is presented. By using the character of wavelet multiresolution, the signal of a system is decomposed at multiple-scale. According to the relationship between the maximum wavelet coefficient modules of high frequency parts of the signal at different level and their positions in the coefficient sequences, those faults are diagnosised in the system. The way for extracting the features of those faults is given. The validity and feasibility of the fault diagnosis method is demonstrated by a simulation.