Reliability Analysis For The Safety And Comfort Of High-speed Train Moving On CRTS â…¡ Track Plate Lay On The Bridge

The article chooses CRTS Ⅱ track plate and power concentration high-speed train developed by China itself as the research object. Based on train-track-bridge coupling dynamics theory and the structure reliability principle, the reliability of safety and comfort of the high-speed train moving on the slab track layed on bridge is solved by means of stochastic finite element method.The following work is carried out in the paper.1. Establish the dynamics model which is suitlabe for train-track-bridge’s random vibration analysis.According to the research content of the paper, the train-track-bridge system is simulated with poper simplification; the train-track-bridge system’s nonlinear finite element analysis of vertical coupling vibration model is established. By means of the principle of total potential energy with a stationary value in elastic system dynamics and the "set-in-right-position" rule for formulating matrices, the equations of vertical motion for the system are formulated. And the corresponding Matlab solver is prepared.2. Analysis the random vibration responses of the train-track-bridge system under the excitation of German low-intrusion high-speed spectrum.Using the German low-intrusion high-speed spectrum as the incentive, random dynamic responses of the system under four kind of speed are obtained. Then the time history curves of dynamic response are given.3. Obtain the probability characteristics and distribution law of the dynamic responses’maximum random variable by statistical analysis.The maximum of dynamic response for the system is taken as a random variable, the sample value of which is represented by the maximum of dynamic response of each time for each speed, then the sample that the size is200of random variable is get. By means of K-S test the probability characteristics and distribution law of the random variable can be obtained. And in the paper the probability characteristics and distribution law is get under four kinds of speed. Furthermore, the influences of the vehicle speed on the dynamic responses are explored.4. Solve the reliability of safety and comfort of the high-speed train moving on the slab track layed on bridge, according to the structure reliability principle.Using the probability characteristics and distribution law of the system’s dynamic responses maximum random variable that have been obtained before, the reliability of safety and comfort of the high-speed train can be solved, according to operational safety and comfort index.Shown as the calculation:safety index of the moving car(trailer) shows a trend of decrease with the increase of operation speed; while comfort index changes not obviously. But they all have enough reliability.