地铁运营下钢弹簧浮置板轨道减振分析

计算模型分为两个部分,列车荷载通过多体动力学软件SIMPACK求得.然后,以有限元软件ANSYS为平台,建立了轨道-隧道-大地三维有限元模型.通过谐响应稳态扫频技术,从频域角度分析定点谐荷载下钢弹簧浮置板轨道引起的大地振动;通过瞬态分析,从时域分析列车荷载下引起的大地振动.结论表明:从频域角度来看,钢弹簧浮置板在接近自身固有频率处会引发地面共振,但影响范围不大;对于中高频有着很好的减振效果.从时域的角度来看,钢弹簧浮置板对应的地表振动远小于整体道床,转频域后其轨道振动分布可按谐响应计算结果解释.

The Vibration Damping Analysis of Steel Spring Floating Slab Tracks in Subway Operations

In this paper the proposed calculation model is made up of two parts: the train load obtained from the multibody dynamics software SIMPACK;the track-tunnel-earth three-dimensional finite element model established on the platform of finite element software ANSYS.Through the harmonic response steady state sweep technology,the paper firstly analyzes the earth vibration caused by the steel spring floating slab tracks from the perspective of frequency domain under the point harmonic load;then in view of time domain transient analysis it discusses the earth vibration under the train load.The study shows that from the perspective of frequency domain the steel spring floating slab close to inherent frequency places may cause ground resonance with a limited impact range;while for high frequency places it has a large damping effect.In light of time domain,the surface vibration corresponding to steel spring floating slabs is far less than the whole ballast bed.The track vibration distribution can be illustrated according to harmonic response calculation after the frequency domain is changed.