磁浮道岔梁自振特性及瞬态响应分析

建立了磁浮道岔五跨钢结构连续梁的梁单元和板单元有限元模型，分析了道岔梁的自振特性，计算了磁浮道岔梁的瞬态响应。模态分析表明道岔梁板单元模型的前5阶扭转频率在14．2Hz至16．1Hz之间，与其现场实测值14．9Hz极为接近，道岔梁梁单元模型的扭转频率计算值明显高于实测值，道岔梁板单元模型能更为准确的反映其振动特性。瞬态响应分析表明磁浮车辆通过时道岔梁第三跨跨中挠度最大，车速240km／h时其最大值约为1．29mm。

Natural Vibration and Transient Response of Maglev Switch Beam

Two finite element models for a five-span steel beam of maglev switch were established by adopting the beam element and the plate element respectively. Then, the natural vibration and transient response of the switch beam were analyzed. Mode analysis showed that the first five torsional frequencies of the plate element model range from 14.2 Hz to 16.1Hz, which is very close to the test value 14.9 Hz. The calculated torsional frequencies of the beam element model are much larger than the test value. So it is concluded that the plate element model can more precisely reflect the vibration characteristics of the maglev switch beam. Furthermore, the transient results showed that the maximum vertical deflection appeared at the mid-span of the third span beam when maglev vehicle passed through maglev switch, which reached 1.29 mm at a running speed of 240km/h.