基于小波包变换的故障诊断  

Fault Diagnosis Based on Wavelet Packet Transform

作　　者：杨长林[1] 许化龙[2] 胡昌华[2] 陈新海[1] 

机构地区：[1]西北工业大学航天工程学院,陕西西安710072 [2]第二炮兵工程学院,陕西西安710025

出　　处：《西北工业大学学报》2000年第3期370-373,共4页Journal of Northwestern Polytechnical University

摘　　要：由于小波包变换在信号分析与处理中 ,具有良好的局部化品质 ,本文提出了一种基于小波包变换的故障诊断方法 ,并应用于控制系统动态测试过程的故障检测。计算和实验结果表明 :该方法可以快速有效地进行故障检测与定位。In this paper, we for the first time present a new method for fault diagnosis of control systems during dynamic test based on wavelet packet transform. Such a method is described in detail in section 2. It involves the following four steps: (1) Decompose the output into j layers by wavelet packet transform. (2) Calculate the energy distribution of the output in 2 j frequency sections by eq.(7). (3) Determine the feature vector according to eq.(8). (4) Determine whether a fault occurs or not by Δ (eq.9). Our method has met with preliminary success in a engineering applications.

关 键 词：动态测试 故障诊断 飞行器 小波变换 控制系统 

分 类 号：V249.122[航空宇航科学与技术—飞行器设计] O174.22[理学—数学]