rack Quality Assessment Method Based on Intrinsic Mode Function

Abstract:

In order to more effectively assess track quality, a new assessment method of track quality energy index (TQEI) is presented in this paper, which based on Intrinsic Mode Function (IMF) and included the factor of track irregularity wavelength. The data of track irregularity is decomposed into finite IMFs by empirical mode decomposition (EMD). The frequency spectrum and the power of each IMF are calculated by using FFT. The energy coefficient of track irregularity IMF is chosen as the ratio of IMF signal energy to the original signal energy, and then track quality energy index is obtained with the corresponding calculation. Track quality index (TQI) is proved to be a special form of TQEI on certain basis. Finally, the track irregularity signal is studied by the new index, which collected by track recording vehicles from Beijing-Guangzhou Railway. The statistic and analysis result indicates that track quality energy index is the development and deepen of track quality index and to assess the track quality accurately and effectively.