| The effect of track irregularity on vibration of train-track system is great. With the development of speeding-up and high-speed railway in China, the requirement to track irregularity is higher. Therefore, this paper "Analysis of effect track irregularity on vertical vibration response of train-track system" has very important theoretical value. At the same time, it also has guidance performance to track maintainance. The major jobs and conclusions completed in the thesis are as follows:1. The comparison with power spectrum of track vertical profile, alignment, and cross-level irregularities between of Zhengzhou-wuchang line and Qinhuangdao-shenyang line is made. The conclusion is that the track irregularity status of Zhengzhou-wuchang line is relatively better than those of Qinhuangdao-shenyang line.2. The comparison with multiplicate methods of track irregularity simulation, such as trigonometric progression method, second filter method, equivalent method based of power spectrum in frequency range and ARMA method is made. By the actual calculation and simulation, the advantages and disadvantages of those methods mentioned above are explained. At the same time, the equivalent method based of power spectrum in frequency range will be recommended.3. The effects of the wavelength and amplitude of the track vertical profile irregularity on the vertical vibration responses of train-track system are analyzed. Some influence rules are understood.4. When sepration between wheel and rail appears, the wheel load reduction rate is equal to one. According to the criterion, the critical wavelength and amplitude of track vertical profile irregularity when the sepration between wheel and rail appears are obtained, respectively.5. The effect of speed (80-200km/h) on vertical vibration of the train-track system is analyzed. The calculated results show that with the speed increase, all of the responses increase, which agrees well with the physic conception. |
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