To investigate the dynamic performance of the low-to-medium-speed (LMS) maglev train and bridge system under uneven ground settlement, a refined vertical dynamic interaction model of the LMS maglev train–track–bridge system with uneven settlement is proposed. Firstly, the numerical model is verified based on the field test. Secondly, the dynamic performances of the system induced by uneven settlements are numerically analyzed. Furthermore, numerical studies are carried out to investigate the effect of various uneven settlement types, to compare the performances of the two typical bridges, and to assess the contribution of the F-rail in the presence of uneven settlement. The results show that uneven settlement has a significant enlargement effect on the dynamic responses of the car body and levitation module, but a very weak influence on the bridge. Both the patterns of uneven settlement and bridge types significantly affect the dynamic response of the maglev train to various levels. The numerical model excluding the track structure will overestimate the dynamic responses of the levitation module. It is suggested that the dynamic interaction model for the maglev train–track–bridge system be selected to simulate the influence of uneven settlement for better accuracy.

中文翻译：

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两座典型桥梁不均匀沉降下LMS磁浮列车-轨道-桥梁系统的动态性能

为研究中低速（LMS）磁悬浮列车与桥梁系统在不均匀地面沉降下的动力性能，提出了一种精细的LMS磁悬浮列车-轨道-桥梁系统不均匀沉降垂直动力相互作用模型。首先，在现场试验的基础上对数值模型进行了验证。其次，数值分析了不均匀沉降引起的系统动力性能。此外，还进行了数值研究，以研究各种不均匀沉降类型的影响，比较两座典型桥梁的性能，并评估 F 型钢在存在不均匀沉降时的贡献。结果表明，不均匀沉降对车身和悬浮模块的动力响应有显着的放大作用，但对桥梁的影响很小。不均匀沉降模式和桥梁类型都对磁悬浮列车的动力响应产生不同程度的影响。不包括轨道结构的数值模型将高估悬浮模块的动态响应。建议选择磁浮列车-轨道-桥梁系统的动力相互作用模型来模拟不均匀沉降的影响，以获得更好的精度。