扣件刚度对钢轨振动特性的影响研究

准确合理的扣件刚度参数对轨道结构设计至关重要,目前的研究尚未明确扣件刚度和钢轨振动特性之间的关系。依据单自由度隔振系统的计算公式,结合国内某地铁线路实测数据,重点研究现场钢轨垂向和横向的固有频率、振型和振动传递特性,有限元仿真和现场锤击测试充分验证了理论计算。在此基础上,通过钢轨整体的共振频率反演得到现场扣件的动刚度。该研究可为轨道减振器的仿真计算和优化设计提供依据。

Influence of Fastener Stiffness on Vibration Characteristics of Rails

Accurate and reasonable fastener stiffness parameters are critical to the design of track structures. The quantitative relationship between fastener stiffness and rail vibration characteristics has not been established. Based on the calculation formula for a of single-degree-of-freedom vibration isolation system and the measured data of a subway line in China, this paper focuses on the natural frequency, and vibration mode, and vibration transmission characteristics of a rail in the vertical and horizontal directions are considered in this investigation. The theoretical calculation is fully verified using finite element simulation and the field hammering test. On this basis, the dynamic stiffness of onsite fasteners is obtained by inversion of the full track resonance frequency. This study can provide a basis for the simulation calculations and the optimized design of a track damper.