柴油机加速振动信号的阶比双谱特征提取

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (1) : 154-158.

论文

柴油机加速振动信号的阶比双谱特征提取

张玲玲1,2, 乔龙2 ,廖红云2,刘远宏 2 ,陈祥龙 2

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Feature Extraction for Accelerating Vibration Signal of Diesel Engine Based on Order Bi-spectrum Estimation

ZHANG Ling-ling 1,2, QIAO Long2, LIAO Hong-yun2,LIU Yuan-hong2,CHEN Xiang-long2

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文章历史 +

摘要

针对发动机加速过程振动信号的非平稳性和混有大量噪声的特点，提出计算阶比跟踪和双谱相结合的方法，将振动信号按等角度间隔进行软件重采样，得到阶域内的平稳信号，再进行双谱分析，通过仿真信号验证了该方法优于传统双谱。为了充分利用阶比双谱图中的信息，提出双谱特征阶比面的概念，通过比较阶比平面内的累加能量来反映不同工况的变化。诊断实例表明，该方法能有效提取柴油机曲轴轴承的故障特征。

Abstract

For the non-stationary and color noise characteristics of accelerating vibration signal from diesel engine , a method based on computed order tracking (COT) and bi-spectrum is proposed. The unstable signal is re-sampled at constant angular interval and the stabilized signal is obtained at the order area, then to analyze by bi-spectrum method. The simulation shows that the order bi-spectrum analysis is superior to the conventional bi-spectrum. To utilize the information from order bi-spectrum results fully , the novel concept—bi-spectrum characteristic order plane is put forward . Different working conditions of engine can be reflected by comparing the accumulated energy within order plane. Experimental results indicate that this method can extract feature of accelerating vibration signal effectively.

导出引用

张玲玲;乔龙;廖红云;刘远宏 ;陈祥龙 . 柴油机加速振动信号的阶比双谱特征提取[J]. 振动与冲击, 2013, 32(1): 154-158

ZHANG Ling-ling;QIAO Long;LIAO Hong-yun;LIU Yuan-hong;CHEN Xiang-long. Feature Extraction for Accelerating Vibration Signal of Diesel Engine Based on Order Bi-spectrum Estimation[J]. Journal of Vibration and Shock, 2013, 32(1): 154-158