This work elaborately conducts the coupled vibration analysis of suspended monorail train and curved bridge (SMTCB) considering a nonlinear wheel-track contact relation. First, a high-efficiency coupled dynamic model of the SMTCB is developed based on a co-simulation method where the train subsystem is established using the multi-body dynamics software UM and the curved bridge subsystem is built adopting the finite element software ANSYS, whose modal information is extracted to put into the UM software; Two subsystems of the train and bridge are coupled by an improved wheel-track contact model (IWTCM) that considers the real nonlinear radial stiffness of a suspended monorail rubber tire. Then, the effects of the extracted modal orders of the bridge on vehicle-bridge vibrational responses are analyzed and discussed in detail, and the minimum modal orders extracted of the bridge that guarantee the convergence and accuracy of the proposed model are also obtained. Subsequently, the vibrational responses obtained by numerical simulation and field test are compared when the vehicle runs on a curved bridge, validating the reliability of the developed model. On this basis, by comparing the vehicle-bridge vibration responses between the traditional FIALA tire model and the IWTCM, some remarkable differences are distinguished, revealing the significances and advantages of adopting the IWTCM. Finally, employing the developed model, the vehicle-curved bridge coupled vibration features are investigated comprehensively and several key parameters are also chosen reasonably. The research results may provide some useful guidance for the design of the SMTCB.

本工作详细地进行了考虑非线性轮轨接触关系的悬挂式单轨列车和曲线桥（SMTCB）的耦合振动分析。首先，利用多体动力学软件UM建立列车子系统，利用有限元软件ANSYS搭建曲桥子系统，建立了SMTCB高效耦合动力学模型。提取模态信息，放入UM软件；列车和桥梁的两个子系统通过改进的轮轨接触模型 (IWTCM) 耦合，该模型考虑了悬挂式单轨橡胶轮胎的真实非线性径向刚度。然后，详细分析和讨论了提取的桥梁模态阶数对车桥振动响应的影响，并获得了保证模型收敛性和准确性的桥梁的最小模态阶数。随后，比较了车辆在曲线桥上行驶时通过数值模拟和现场试验获得的振动响应，验证了所开发模型的可靠性。在此基础上，通过对比传统 FIALA 轮胎模型与 IWTCM 的车桥振动响应，区分了一些显着差异，揭示了采用 IWTCM 的意义和优势。最后，利用所建立的模型，对车曲桥耦合振动特性进行了综合研究，并合理选择了几个关键参数。研究结果可为SMTCB的设计提供一些有益的指导。