| 基于共振解调技术的高速铁路焊接接头状态评判方法 |
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| 引用本文： | 康熊,黎国清,王卫东,刘金朝.基于共振解调技术的高速铁路焊接接头状态评判方法[J].中国铁道科学,2011,32(5). |
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| 作者姓名： | 康熊 黎国清 王卫东 刘金朝 |
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| 作者单位： | 中国铁道科学研究院,北京,100081 |
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| 基金项目： | 国家“八六三”计划重点项目(2009AA110302); 铁道部科学技术研究开发计划项目(2010T001-B) |
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| 摘 要： | 基于广义共振原理,利用共振解调方法将钢轨焊接接头对车辆—轨道系统的低频周期性冲击特征的分析转换为对其高频共振的分析.对轴箱垂向加速度实测数据进行带通滤波,然后利用希尔伯特变换得到轴箱垂向加速度包络,并采用离散时间傅里叶变换对包络进行分析得到细化包络谱.利用细化包络谱第1主频能量与其0～5 Hz内的总能量之百分比反映钢轨焊接接头对车辆—轨道系统的周期性冲击特性,并根据该百分比与滤波频率的关系曲线的峰值确定带通滤波截止频率,由此得到带通滤波的频率范围是20～450 Hz.结合钢轨焊接接头处轴箱垂向加速度有效值出现大值的位置和钢轨焊接接头周期性间距近似为100 m的性质,对钢轨焊接接头进行精确定位.根据300 km·h-1速度级高速铁路钢轨焊接接头处轴箱垂向加速度移动有效值的分布规律,确定其阈值为50 m·s-2,依此作为评判钢轨焊接接头状态的依据.在此基础上,给出了300 km·h-1速度级高速铁路焊接接头状态动态评判方法和实现方式.
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| 关 键 词： | 钢轨焊接接头 状态评判 共振解调 轴箱加速度 移动有效值 高速铁路 |
Evaluation Method for High-Speed Railway Welded Joints Based on Resonance Demodulation Technology |
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| KANG Xiong,LI Guoqing,WANG Weidong,LIU Jinzhao.Evaluation Method for High-Speed Railway Welded Joints Based on Resonance Demodulation Technology[J].China Railway Science,2011,32(5). |
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| Authors: | KANG Xiong LI Guoqing WANG Weidong LIU Jinzhao |
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| Institution: | KANG Xiong,LI Guoqing,WANG Weidong,LIU Jinzhao(China Academy of Railway Sciences,Beijing 100081,China) |
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| Abstract: | Based on the generalized principle of resonance,resonance demodulation method is used to transform the analysis on low frequency periodic impact of rail welded joints on the vehicle-track system into the analysis of high-frequency resonance.The envelope of the measured vertical acceleration of the axle-box preprocessed by band-pass filter is extracted by use of Hilbert transform,and discrete time Fourier transform is applied to calculate its refined envelope spectrum.The percentage ratio of the energy corre... |
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| Keywords: | Rail welded joint Status evaluation Resonance demodulation Axle-box acceleration RMS value High-speed railway |
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