BEMD全矢包络谱及其在TRT故障诊断中的应用

Full envelope spectrum based on BEMD and its applications in TRT fault diagnosis

为全面提取转子故障时振动信号特征,提高故障诊断的可靠性,提出了一种基于全矢包络谱的旋转机械故障诊断方法。首先,利用正交采样技术获取转子同一截面上互相垂直的振动信号,将其组成复数信号;然后,运用基于能量阀值的二元经验模态分解(BEMD)将复数信号分解成系列复固有模态函数分量(CIMFs),利用希尔伯特变换(HT)解调CIMFs获得复包络信号;最后,通过全矢谱技术融合复包络信号得到全矢包络谱,在此基础上,进行故障诊断。柔性转子和高炉煤气余压透平发电装置故障诊断结果证明了所提方法的有效性和可行性。

In order to fully extract the characteristics of vibration signal and improve the reliability of fault diagnosis,a mechanical fault diagnosis method based on FVES（Full Vector Envelope Spectrum） is proposed.Firstly,the orthogonal sampling technique is used to obtain the mutually perpendicular rotor vibration signal in the same section and composited them to a complex signal. Secondly,this complex signal is divided into series of CIMFs（Complex Intrinsic Mode Functions） based on BEMD（Bivariate Empirical Mode Decomposition）,which are demodulated by Hilbert transform to get the envelope signal of CIMFs. Finally,the complex envelope signal is fused by Full Vector Spectrum technology to get corresponding FVES for fault diagnose.The fault diagnosis results of rubbing rotor and the blast furnace top gas recovery turbine unit show that the proposed method is accurate and complete.