变转速工况下液压泵故障振动信号的角域烈度特征提取方法  

Angular domain intensity feature extraction method for fault vibration signals of hydraulic pump under variable rotating speed condition

作　　者：刘思远[1,2,3] 王志伟 姜万录 李晓明[4] 卢明立[3] 卢正点 LIU Siyuan;WANG Zhiwei;JIANG Wanlu;LI Xiaoming;LU Mingli;LU Zhengdian(Hebei Provincial Key Lab of Heavy Machinery Fluid Power Transmission and Control,Yanshan University,Qinhuangdao 066004,China;MOE Key Lab of Advanced Forging&Stamping Technology and Science,Yanshan University,Qinhuangdao 066004,China;Jiangsu Tianming Machinery Co.,Ltd.,Lianyungang 222300,China;China Railway Construction Heavy Industry Group Co.,Ltd.,Changsha 221116,China)

机构地区：[1]燕山大学河北省重型机械流体动力传输与控制重点实验室,河北秦皇岛066004 [2]先进锻压成形技术与科学教育部重点实验室(燕山大学),河北秦皇岛066004 [3]江苏天明机械集团有限公司,江苏连云港222300 [4]中国铁建重工集团有限公司,长沙221116

出　　处：《振动与冲击》2020年第17期142-149,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51505411,51875498);河北省自然科学基金重点项目(E2018203339)。

摘　　要：提取对故障敏感的特征信息是提高液压泵状态评估准确性的关键;由于目前变转速工况下液压泵故障的敏感特征信息严重匮乏,导致评估准确率偏低;为此,针对液压泵滑靴磨损故障,提出角域烈度特征的新概念和新的特征提取方法。该方法利用阶比分析方法将时域非平稳振动信号转换成角域平稳信号,依据振动烈度的定义和频域计算方法,得出角域平稳振动信号的单边幅值谱和谐波频率,由此推导出三种振动信号类型(位移、速度和加速度)的角域烈度特征因子计算公式。以液压泵滑靴内边缘磨损故障为例,在变转速工况条件下提取故障振动信号的角域烈度特征因子,通过与阶次能量特征因子进行定性与定量分析比较,证实了角域烈度特征因子对滑靴磨损故障的劣化发展具有更强的敏感性。Extracting feature information sensitive to faults is the key to improve the correctness of hydraulic pump condition assessment,due to severe lack of sensitive feature information of hydraulic pump faults under variable rotating speed condition,the assessment correctness rate is much low.Here,a new concept of angular domain intensity feature and a new feature extraction method for hydraulic pump slipper wear faults were proposed.Non-stationary vibration signals in time domain were converted into stationary ones in angular domain with the order analysis method.According to the definition of vibration intensity and the calculation method in frequency domain,unilateral amplitude value spectra and harmonic frequencies of stationary vibration signals in angular domain were obtained,and then calculation formulas of angular domain intensity feature factors for three vibration signals including displacement,velocity and acceleration were derived.Taking inner edge wear fault of hydraulic pump slipper as an example,the angular domain intensity feature factor of fault vibration signals was extracted under variable rotating speed condition.Qualitative and quantitative contrastive analyses were performed for this feature factor and the order energy one.It was shown that the angular domain intensity feature factor is more sensitive to deterioration development of hydraulic pump slipper wear fault.

关 键 词：角域烈度特征 变转速 液压泵 振动信号 特征提取 

分 类 号：TP277[自动化与计算机技术—检测技术与自动化装置]