非线性消噪的LP方法在振动信号分析中的应用  

Nonlinear Noise Reduction and Its Application to the Vibration Signal Analysis

作　　者：何卫锋[1] 程礼[1] 李小刚[1] 罗俊[1] 

机构地区：[1]空军工程大学工程学院,西安710038

出　　处：《振动工程学报》2004年第4期408-411,共4页Journal of Vibration Engineering

摘　　要：采用局部投影(LP)方法对测量数据进行消噪处理,对被噪声污染的Henon映射数据进行了消噪前后的一致性检验,计算其消噪前后的关联维数。结果表明,该方法能较好地再现被污染信号的非线性特征,提高依据非线性特征进行发动机振动故障的分类和诊断的可靠性。Noise has great influence on the time series signal analysis for aeroengine. To eliminate the measured noise, the local projective noise reduction is applied first. And then the consistence of the method is tested by means of estimating the correlation dimension of Henon map trajectory after noise reduction. It is proved that the method is effective to reproduce the nonlinear invariant parameters such as correlation dimension. The aeroengine signal is processed, and its correlation dimension is estimated accurately, which can describe the nonlinear characteristics properly and can be used to classify different faults.

关 键 词：LP 诊断 法能 局部 方法 污染 消噪处理 信号 HENON映射 故障 

分 类 号：V474[航空宇航科学与技术—飞行器设计] TN911[电子电信—通信与信息系统]