非线性浮置板轨道减振系统的工程化设计研究

Aiming at the problems of the bad behavior of traditional steel floating slab track vibration isolation at lower frequencies and it’s larger vibration response, the designing optimized objective is proposed based on the load characteristics of the floating slab isolators. Based on the nonlinear damping vibration reduction technique and dynamic vibration absorbing technique, nonlinear floating slab track system and its key components (nonlinear damping isolators and dynamic vibration absorbers) are developed by means of theoretical analysis, numerical simulation and real scale track tests. This study shows that nonlinear damping, dynamic vibration absorbers and nonlinear floating slab system has a good vibration suppression effects on isolator supporting force, floating slab acceleration and tunnel vibration near the first nature frequency of the floating slab track, in which the nonlinear floating slab system has the most obvious vibration reduction effect, especially at lower frequencies. Besides, the nonlinear floating slab track system can suppress the vibration amplification problem when the dynamic vibration absorber deviates from its designing frequencies. The acceleration of dynamic vibration absorber is greater than that of the floating slab, while the displacement of them is nearly the same, which indicates that the dynamic vibration absorber can absort the vibration effectively, while it will not produce large relative displacement to ensure vehicle running safety.