摘要
带通滤波器参数(中心频率和带宽)设置是共振解调的关键,针对快速峭度图找寻的中心频率偏大、带宽过宽的问题,应用Infogram(信息图)确定带通滤波器参数。研究分析了信息图的概念及特点;通过构建脉冲噪声干扰和故障脉冲高重复率两种仿真信号,对信息图和快速峭度图进行了分析对比,信息图对共振频带的优选效果强于快速峭度图;将信息图应用到轴承内圈、滚动体故障振动信号共振解调中,可得到故障特征频率及其谐波、转频、边频带等轴承故障特征参数,故障特征明显、故障信息较为丰富。
Selecting proper parameters( center frequency and bandwidth) of a band-pass filter is crucial to resonance demodulation. However,those parameters selected by the fast kurtogram were not satisfactory; therefore,Infogram was proposed. Firstly,its concept and peculiarity were investigated. Then to compare the application effect of the Infogram with the fast kurtogram,the simulated signals with the impulsive noise and high repetition rate were designed. The Infogram was better than the fast kurtogram for identification ability of resonance frequency bands. Finally the Infogram was applied to resonance demodulation of the vibration signals of faulted bearings,and the feature parameters( fault characteristic frequency and its harmonics,sidebands,and etc.) of faulted bearings were clearly observed. The result shows the bands selected by the Infogram have two obvious advantages: fault characteristics are highlighted and fault information is rich.
引文
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