摘要
H ilbert-Huang变换(HHT)被认为近年来信号分析领域的一大突破。适用于非平稳、非线性信号分析。从往复机械上得到的振动信号往往具有非平稳、非线性特征,因此采用HHT方法分析是一种较佳的选择。然而,该方法提出不久,并不能用一个解析公式表示,影响了对其理论分析及性能评价。建立一多分量仿真信号,并应用HHT、傅里叶变换、小波变换、时频分布对其分析比较,证明它具有较高的分解效率及准确地刻画信号的能力,并由此发展了能消除多分量信号交叉干扰项的时频分析方法。应用HHT对内燃机敲缸信号进行分析,有效地提取故障的特征信息,为往复机械的状态监测及故障诊断提供了一条有效途径。
Hilbert-Huang Transform（HHT） is regarded as a breakthrough method in the signal analysis domain. It is suitable to analyze nonlinear and non-stationary data. The vibration signal from the reciprocating engine is non-stationary, time-variation, so, application of HHT is a good choice. However, the technique cannot be expressed by an analytical formulation so that it is difficult to conduct theoretical analysis and performance evaluation. A multicompomnet signal was built. And then, compared with the Fast Fourier Transform（FFT） and Wavelet Transform （WT） and Wigner-Ville Distribution（WVD）, HHT has the capability of the high efficient decomposition signal and accurately describing it, by which a reducing cross terms interference Time-Frequency Distribution（TFD） method was developed. Applying of HHT to analyze knock cylinder signal, result shows that it can effectively extract fault signal characteristic information and give a way of the condition monitoring and fault diagnosis for reciprocating machinery.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2005年第10期9-12,共4页
Transactions of the Chinese Society of Agricultural Engineering
