Experimental Research On Vibration Characteristics Of Vibration Reducing CRTS â…¢ Slab Ballastless Track

With the continuous development of high-speed railway in our country, our national high speed railway has gone out of the country to the world, so it is of great significance in engineering application to carry out the study of vibration characteristics of CRTS III slab track, which patent was hold by our country. The article focuses on vibration type CRTS III Slab Track, uses method of drop test and builds equal proportion model, and in-situ test is conducted on this basis. Meanwhile, based on the vibration theory and vehicle-track vertical coupling dynamics theory, using finite element software ABAQUS, the test data is compared and analyzed. The following conclusions are obtained.(1) Based on time domain analysis, stiffness of damping cushion has less impact on rail vertical acceleration but large impact on rail vertical displacement, and rail vertical displacement decreases gradually with the increasing of stiffness of damping cushion. Stiffness of damping cushion has a certain effect on both vertical acceleration and vertical displacement of track slab, and vertical acceleration and vertical displacement of track slab decrease gradually with the increasing of stiffness of damping cushion. Stiffness of damping cushion has a certain effect on bed vertical acceleration, the larger the stiffness of damping cushion, the larger the bed vertical acceleration is.(2) Transfer function analysis shows that damping cushion has a large effect on transfer function of track interlayer structure, the value of transfer function between track slab and rail is less than 1, transfer function decreases with the increasing of stiffness of damping cushion, Plane stiffness 0.02MPa/mm shock absorbing cushion transfer function of the magnitude of the largest peak of up to 0.74. The transfer function between bed and track slab is also effected, and the larger the stiffness of damping cushion, the transfer function is, The larger the transfer function, plane stiffness 0.02MPa/mm damping cushion the transfer function of the minimum peak at 0.65, which also explains the damping cushion plays a certain effect on vibration isolation of track structure.(3) The natural frequency of track structure is given from the first mode to fifth mode based on test data. By comparative analysis of natural frequency of track structure with different stiffness of damping cushion, we can find that stiffness of damping cushion has little impact on first three step natural frequency of track structure but large impact on high order natural frequency, which presents the regularity of larger natural frequency of track structure and larger stiffness of damping cushion.(4) By comparative analysis of acceleration-vibration level of test data, the damping effect of different stiffness of damping cushion on track structure is obtained. The data shows that vibration damping is best when stiffness is 0.02MPa/mm, vibration damping is better when stiffness is 0.04MPa/mm, and vibration damping is least when stiffness is 0.08MPa/mm. The drop shaft height also effects the value of damping vibration level, and the larger the drop shaft height, the more obvious the damping vibration is.