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

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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。
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	刘思远1
	2
	3
	王志伟1
	2
	姜万录1
	2
	李晓明4
	卢明立3
	卢正点3

关键词 ：角域烈度特征, 变转速, 液压泵, 振动信号, 特征提取

Abstract：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.

Key words： angular intensity feature variable rotating speed hydraulic pump vibration signal feature extraction

收稿日期: 2019-02-12 出版日期: 2020-08-28

引用本文:

刘思远1,2,3，王志伟1,2，姜万录1,2，李晓明4，卢明立3，卢正点3. 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[J]. 振动与冲击, 2020, 39(17): 142-149.
LIU Siyuan1,2,3, WANG Zhiwei1,2, JIANG Wanlu1,2, LI Xiaoming4, LU Mingli3, LU Zhengdian3. Angular domain intensity feature extraction method for fault vibration signals of hydraulic pump under variable rotating speed condition. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(17): 142-149.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I17/142

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