The Evaluation Analysis of Track Irregularity Based on Empirical Mode Decomposition Method

• 1、School of Civil Engineering, Central South University, Changsha 410075, China
• 2、National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, China

Abstract：Based on the inverse fourier transform method, we can get the simulation irregularity value of speed 120km/h, 160km/h, and 200km/h for the nation's main railway way, the American Six-level Spectrum, and the track spectrum preliminarily got through analyzing the actual data of Huning (Shanghai-Nanjing), Huhang (Shanghai-Hangzhou), Jinghu (Beijing-Shanghai) High-speed Railway, and make these values as the standard track irregularity states. This text absorbed the idea of dividing the rank of the railway line by its speed, at the same time, based on the empirical mode decomposition method can adaptively abstract the wave-amplitude message of the irregularity in high resolution, we can acquire the foundation of intrinsic mode function ( IMF ), based on this , putting forward two evaluation indexs: the standard deviation of the IMFand the secondary standard deviation, we can use this two index for evaluating the irregularities' size feature of the amplitude wave at the frequency domain and the relative amplitude wave size of the rail section at the whole frequency domain. On account of the methods above, through comparative analysis the inverting data of track spectrum and the actual measured data, it demonstrated that the method above is effective. At last, based on the orthogonality and completenese of EMD signal component, inferred this relation between the and , we can still further perfect the EMD evaluation method.

Keywords： railwaytransportation the evaluation of track irregularity empirical mode decomposition track spectrum intrinsic mode function evaluation index track irregularity index