磁浮车桥耦合振动性能模拟的离线混合试验方法

Off-line Hybrid Test Method for Vibration Performance Simulation of Coupled Maglev Train-Bridge

磁浮轨道交通的核心问题是车桥耦合振动,实时混合试验技术近年来已在实验室内用于测试桥上行车性能,但有较高的实时性要求.基于此,采用离线混合试验方法,避免了实时混合试验中数值与物理部分之间的高实时同步性难题,结合不动点迭代算法,发展了磁浮桥上行车性能模拟的离线混合试验方法.在振动台内环离线控制的基础上,设计外环控制器,构成双层离线迭代控制框架,以提高磁浮车桥耦合振动的试验复现精度.在数值环境下进行了磁浮桥上行车离线混合试验.结果表明:该方法能够在有限次迭代后解决磁浮车桥动态响应收敛问题,验证了该方法复现磁浮车桥耦合振动性能的可行性.

The core problem of maglev rail traffic is the coupled vibration of vehicle and bridge.In recent years,the technology of real-time hybrid test has been used in the laboratory to test the performance of train operation on bridge,but it has higher real-time requirements.Based on this,this paper adopted the off-line hybrid test method,which avoided the difficulty of high real-time synchronization between numerical and physical parts in real-time hybrid test.Combined with the fixed-point iteration,the off-line hybrid test method was developed to simulate the performance of the driving train on maglev bridge.Based on the shaking table inherent off-line iterative control,an outer loop off-line iterative controller was designed to form a double-layer off-line iterative control framework to improve the test reproduction accuracy of the maglev train-bridge coupled vibration.The off-line hybrid test on maglev train-bridge was carried out in the numerical environment.Results show that this method can solve the dynamic response convergence problem of coupled maglev train-bridge system after finite iterations.The feasibility can be verified for this method to reproduce the coupled vibration performance of maglev train-bridge.