Hilbert能量谱及其在齿轮故障诊断中的应用_于德介.pdfVIP

30 4 ( ) Vol. 30, No.4 2 0 0 3 8 Journal of Hunan University(Natural Sciences) Aug 2 0 0 3 : 2003) Hilbert 于德介 , 程军圣, 杨 宇 ( , 410082) : 将HilbertHuang 变换引入齿轮故障诊断, 提出了局部Hilbert 能量谱的概念, 同 建立了一种基于HilbertHuang 变换的齿轮故障诊断方法: Hilbert 能量谱方法. 该方法 首先采用EMD 方法将齿轮故障振动信号分解为若干个固有模态函数( Intrinsic Mode unc tion, 简称 IM ) 之和, 然后选择包含故障信息的 IM 分量进行Hilbert 变换得到局部 Hilbert 能量谱在局部瞬 能量图中可以发现, 齿轮故障振动信号具有明显的冲击特征, 从而可进一步对齿轮故障进行诊断. :HilbertHuang 变换; 局部Hilbert 能量谱;局部瞬 能量; 齿轮故障诊断 :TH 165. 3 :A Hilbert Energy Spectrum and Its Application to Gear ault Diagnosis YU Dejie , CHENG Junsheng , YANG Yu ( College of Mechanical and Automotive Engineering, Hunan Univ, Changsha 410082, China) Abstract: HilbertHuang transform(HHT) is a new and selfadaptive signal processing method, which in cludes EMD (Empirical Mode Decomposition) method. In this paper, the concept of local Hilbert energy spec trum was established. Meanwhile, a gear fault diagnosis method based on HHT named Hilbert energy spectrum was proposed, in which the gear fault vibration signal is decomposed into a number of intrinsic mode function ( IM ) components, and the local Hilbert energy spectrum can be obtained by applying Hilbert transform to some IM components including fault information. The gear fault vibration signal changes periodically on the time axisof the local Hilbert energy spectrum, and the shock characteristic of gear fault vibration can be detected obviously from the local instantaneous energy. T herefore, the gear fault can be diagnosed. Key words: HilbertHuang transform ; local Hilbert energy spectrum ; local instantaneous ener