磁悬浮车辆随机振动响应分析及其平稳性研究

以德国Transrapid磁悬浮系统为原型，建立了磁悬浮车辆/线路相互作用模型，高速磁悬浮线路随机不平顺则引入了分段功率谱表述模型。运用数值积分法和时频转换法对磁悬浮车/线、车/桥系统随机响应进行了仿真分析，并以先进地面交通车辆走行品质UTACV规范和铁道车辆Sperling平稳性指标对磁悬浮车辆运行平稳性进行评价。

A Study on Maglev Vehicle Vertical Random Virbration and Ride Quality

Based on the German maglev vehicle TR06,a maglev vehicle/guideway model is established, where the guideway random irregularities are described in three subsections of irregularity wavelength. Using the numerical integration and the time-frequency transform method, the random responses of maglev vehicle are simulated and analyzed, and the ride quality of maglev vehicle is evaluated according to the UTACV power spectral density ride quality standard and the Sperling ride index method. The numerical results show that the main frequency of maglev carbody vibration is 0.5~1Hz, and for elevated guideway there are a periodic response at 2.2Hz due to periodic configure of rigid piers. Maglev carbody acceleration PSD meets the UTACV criterion and its acceleration amplitude is less than 0.05g which has became factual AGT vehicle standard. Whatever guideways the Sperling ride index of maglev vehicle is less than 2.5 when vehicle velocity is under 450km/h, so maglev vehicle ride comfort is excellent.