Study on the dynamic characteristics and parameter identification of elastic hydraulic isolator in floating slab track system

The elastic hydraulic isolator is a novel liquid-gas mixture isolator applied to floating slab track structure. The dynamic parameters of isolators are the key to the attenuation effect of ground vibration. Therefore, a nonlinear dynamic model and parameter identification method for vibration isolation supports of floating slab track structure is proposed. The changes in stiffness and damping parameters of the elastic hydraulic isolator are studied by changing its damping components and comparing them with those of the steel spring isolator and rubber isolator. The results indicate that the accuracy of the nonlinear dynamic model is verified by comparing the experimental curve with the reconstructed curve. The dynamic parameters of the elastic hydraulic isolator are dependent on the excitation frequency and amplitude and are influenced by the liquid viscosity and the damping plate. The stiffness and damping parameters of the elastic hydraulic isolator are similar to those of the rubber isolator, but the variation law with excitation frequency is different.