| 基于Copula函数的高速列车转向架故障特征提取 |
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| 引用本文： | 金炜东,吕乾勇,孙永奎.基于Copula函数的高速列车转向架故障特征提取[J].西南交通大学学报,2015,28(4):676-682. |
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| 作者姓名： | 金炜东 吕乾勇 孙永奎 |
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| 基金项目： | 国家自然科学基金资助项目(61134002) |
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| 摘 要： | 为了实时监测高速列车转向架关键部件的工作状态,提出了一种基于Copula函数的特征提取方法.以某型高速列车转向架正常、抗蛇形减振器失效、空气弹簧失效、横向减振器失效4种工况的振动信号为研究对象,将信号进行聚合经验模态分解,针对得到的本征模态函数,使用Gaussian Copula函数构建它们的联合概率密度函数.提取边缘分布的Kullback-Leibler Distance值,及联合概率密度函数的均值和方差作为特征,采用支持向量机进行识别.实验结果表明,在200 km/h速度下,故障平均识别率在95%以上,表明了该特征提取方法的有效性.
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| 关 键 词： | 高速列车 聚合经验模态分解 Copula函数 特征提取 |
| 收稿时间： | 2014-12-15 |
Extracting Fault Features of High-Speed Train Bogies Using Copula Function |
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| JIN Weidong,LÜ,Qianyong,SUN Yongkui.Extracting Fault Features of High-Speed Train Bogies Using Copula Function[J].Journal of Southwest Jiaotong University,2015,28(4):676-682. |
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| Authors: | JIN Weidong LÜ Qianyong SUN Yongkui |
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| Abstract: | To monitor the working condition of key components of high-speed train bogies in real time, an approach using Copula function to extract features is proposed. Vibration signals of a certain high-speed train are obtained under four typical working conditions, including normal condition, yaw damper fault, air spring fault, and lateral damper fault. The vibration signal is decomposed by ensemble empirical mode decomposition first. Then, the joint probability distribution of intrinsic mode functions is computed by Gaussian Copula function. The Kullback-Leibler distance of two marginal distribution functions, and the mean and variance of the joint probability density function are extracted as the features. The support vector machine is used to classify the working conditions. The experimental result shows that the average recognition rate is above 95% at the speed of 200 km/h, which verifies the effectiveness of the proposed feature extraction method. |
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