| 高速铁路轨道不平顺的时频特征分析 |
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| 引用本文： | 刘彩云,郭爱煌,崔炳胜.高速铁路轨道不平顺的时频特征分析[J].电子测量技术,2009,32(7):29-32. |
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| 作者姓名： | 刘彩云 郭爱煌 崔炳胜 |
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| 作者单位： | 1. 同济大学,电子与信息工程学院,上海,200092
2. 中国铁通天津通信段,天津,300380 |
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| 摘 要： | 针对高速铁路实测轨道振动加速度信号，对比了STFT、WVD和Gabor变换三种方法分析的时频特征，利用STFT分析结果提取出匀速条件下最不利长波不平顺波长；针对STFT时频分辨率受限的特点，提出改进方案；利用改进后的STFT分析了实测信号的时频特征。时频分析结果表明：高速铁路长波不平顺信号振动频率与列车速度呈单调递增关系；改进的STFT能够顺利提取长波不平顺信号特征频率。
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| 关 键 词： | 高速铁路 轨道不平顺 时频分析 短时傅里叶变换 |
Time-Frequency characteristic analysis of track irregularity of high-speed railway |
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| Liu Caiyun,Guo Aihuang,Cui Bingsheng.Time-Frequency characteristic analysis of track irregularity of high-speed railway[J].Electronic Measurement Technology,2009,32(7):29-32. |
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| Authors: | Liu Caiyun Guo Aihuang Cui Bingsheng |
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| Affiliation: | 1.School of Electronic and Information Engineering;Tongji University;Shanghai 200092;2. CHINATIETONG Tianjin Commpany;Tianjin 300380 |
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| Abstract: | The time-frequency characteristics of a vibration signal,measured on some high-speed railway,was given by short time Fourier transform(STFT),Wigner-Ville distribution(WVD)and Gabor transform. The most disadvantage irregularity wavelength,under uniform conditions,was extracted by the result of STFT. Because of the contradiction between time and frequency resolution,an improved STFT was raised to analyze the time-frequency characteristics of the signal.The results show that the vibration frequency of long-wav... |
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| Keywords: | high-speed railway track irregularity time-frequency analysis short time fourier transform |
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