基于频域形态滤波的低速滚动轴承声发射信号降噪新方法  

A new de-noising method for acoustic emission signal of rolling bearings with low speed based on morphological filtering in frequency domain

作　　者：李修文[1] 阳建宏[1] 黎敏[1] 徐金梧[1] 

机构地区：[1]北京科技大学机械工程学院,北京100083

出　　处：《振动与冲击》2013年第1期65-68,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金(50905013;51004013);高等学校博士学科点专项科研基金(20090006120007);中央高校基本科研业务费专项资金(FRF-TP-09-014A;FRF-AS-09-008B)

摘　　要：声发射检测技术以其灵敏度高、频响范围宽、信息量大等优点,为机械故障诊断提供了一条新的检测途径,但应用于旋转机械设备时,容易混入各种有色噪声。当噪声频率与声发射信号重叠时,传统的降噪方法难以满足要求。将形态滤波应用到信号频域,可以有效消除有色噪声的干扰。根据声发射频响特性,对频谱进行拟合平滑高斯白噪声的影响,最后重构到时域。仿真和实际低速轴承信号表明此方法具有较好的降噪效果,有利于信号后续的处理和分析。Acoustic emission technique provides a new measuring approach for machinery fault diagnosis because of its characteristics of high sensitivity, wide frequency response range and containing much information. An acoustic emission signal often is mixed with a variety of color noise when applied to a rotating machinery. Traditional noise reduction methods can not meet the measuring requirements when the frequencies of noise and those of acoustic emission signals overlap. Here, morphological filtering was applied to eliminate color noise in frequency domain. According to the acoustic emission fre^Iuency response characteristic, a spectrum was fitted in order to smooth white Gaussian noise. Finally, a time domain waveform was reconstructed. The simulation results and the real signals of rolling bearings with low speed showed that the proposed methodology can achieve good effect of noise reduction, and is beneficial to the subsequent processing and analysis of signals.

关 键 词：频域形态滤波 声发射 故障诊断 

分 类 号：TG115.28[金属学及工艺—物理冶金] TH133.3[金属学及工艺—金属学]