More intensive vibration reduction measures are necessary given increasing demands for urban rail transit vibration control. While the floating slab track system remains the most effective vibration isolation measure, a large vibration reduction blind area can still be observed at low frequencies. In the present study, a general quasi-zero-stiffness vibration isolator (GQZS vibration isolator) was proposed to enhance the ultra-low frequency (< 20 Hz) vibration control capability of floating slab tracks. The dimensionless analysis was utilised to design nonlinear stiffness curves and to determine the proposed GQZS vibration isolator static mechanical performance. Analyses of the dynamic mechanical behaviours of the proposed vibration isolator were conducted based on the force transmissibility rate. Results showed that the designed stiffness curve effectively reduced force transmissibility at low frequencies. A vehicle-floating slab track-substrate coupled dynamic model was proposed considering complicated train loads, and the results were consistent with force transmissibility analyses. When compared with conventional linear steel spring vibration isolators, the proposed GQZS vibration isolator significantly enhanced the floating slab track vibration reduction performance at ultra-low frequencies without affecting the driving stability or safety.

随着城市轨道交通减振需求的不断增加，需要采取更强化的减振措施。虽然浮动板式轨道系统仍然是最有效的隔振措施，但在低频下仍然可以观察到较大的减振盲区。在本研究中，提出了一种通用准零刚度隔振器（GQZS 隔振器），以增强浮动板式轨道的超低频（< 20 Hz）振动控制能力。无量纲分析用于设计非线性刚度曲线并确定所提出的 GQZS 隔振器静态力学性能。基于力传递率对所提出的隔振器的动态力学行为进行了分析。结果表明，设计的刚度曲线有效地降低了低频下的力传递率。提出了考虑复杂列车载荷的车辆-浮动平板轨道-基板耦合动力学模型，结果与力传递分析结果一致。与传统的线性钢弹簧隔振器相比，所提出的GQZS隔振器在不影响行驶稳定性或安全性的情况下，显着提高了浮动板式轨道在超低频下的减振性能。