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为满足提速线路最高行车速度250km.h-1的要求,研究截止波长为70m的轨道长波不平顺检测技术。选择合适的电路参数设计模拟滤波器。根据模拟滤波器的性能、传感器精度、70m截止波长和±1mm检测精度的要求,确定轨检车最低检测速度为40km.h-1。设计以三角窗为基窗、各窗函数并联、截止波长为70m的数字滤波器,并编程实现;对现场检测数据进行频谱分析,证明设计的数字滤波器滤波效果良好。检测的轨道长波不平顺以波形图和浏览波形图显示,并用于评价轨道质量。通过在轨检车上应用和现场复核,长波不平顺检测技术满足提速线路检测的需要。
In order to meet the requirements of the maximum speed of 250km.h-1, the long-wave track irregularity detection technology with a cutoff wavelength of 70m was studied. Select the appropriate circuit parameters to design analog filters. According to the requirements of analog filter performance, sensor accuracy, 70m cutoff wavelength and ± 1mm detection accuracy, the minimum detection speed of railcar is 40km.h-1. The triangular window is taken as the base window, the window functions are connected in parallel, the digital filter with cutoff wavelength of 70m is realized and programmed. The spectral analysis of field test data proves that the designed digital filter has a good filter effect. Long-wave tracks of detected orbital irregularities are shown in waveforms and viewing waveforms and are used to evaluate orbital quality. Through the application and on-site inspection car inspection, long-wave non-smooth detection technology to meet the needs of speed testing line.