摘要
针对滚动轴承振动信号的非线性和非平稳性特点,提出了一种结合变分模式分解(VMD)和Volterra预测模型的轴承振动信号特征提取方法。利用VMD良好的非平稳信号分解能力将轴承振动信号分解成有限个平稳的本征模式函数(IMF)分量,然后对各IMF分量进行相空间重构,在重构的相空间内建立Volterra自适应预测模型,根据类内类间距准则对模型参数进行优选,用于描述轴承振动信号。对4种状态的滚动轴承振动信号进行了分析,优选的特征参数表现出较好的分类性能。实验结果表明,该方法能有效提取振动信号中的非线性和非平稳特征,从而提高滚动轴承故障诊断精度。
Aiming at nonlinear and non-stationary characteristics of rolling bearing vibration signals,a feature extraction method for rolling bearing vibration signals based on variational mode decomposition( VMD) and Volterra prediction model was proposed. VMD with a good ability of non-stationary signal decomposition was utilized to decompose a rolling bearing vibration signal into finite stationary intrinsic mode functions( IMFs). Then phase space reconstruction was conducted for these IMFs. Volterra prediction model was established in the reconstructed phase space. With the class distance within class criterion,the model 's parameters were optimized to describe the bearing vibration signal. Four different states of rolling bearing vibration signals were analyzed, the optimized feature parameters had a better classification performance. Test results indicated that the proposed method can effectively be used to extract nonlinear and non-stationary features of vibration signals,and improve the fault diagnosis accuracy of rolling bearings.
出处
《振动与冲击》
EI
CSCD
北大核心
2018年第3期129-135,152,共8页
Journal of Vibration and Shock
基金
国家自然科学基金(E51205405
51305454)
