湖南大学学报（自然科学版）2016，Vol.43Issue(11)：120-130,11.
基于改进迭代模型的车桥耦合系统竖向随机振动研究∗
Study on Vertical Random Vibration of Train-bridge Coupled System Based on Improved Iteration Model
摘要
Abstract
By using the improved iteration model for train-bridge coupled system,the analysis model of train-track bridge vertical random vibration based on Pseudo Excitation Method (PEM)was established. PEM was applied to transform the random track irregularities into the superposition of a series of vertical harmonic irregularities,while the iteration calculation was applied to solve the equation of the train-bridge coupled system.Taking a five-span simply-supported beam bridge passed through by a CRH2 high-speed train as numerical example,the accuracy and efficiency of the improved iteration model for train-bridgecoupled system was verified.The results show that the calculation efficiency of the improved model is a-bout 5 times that of the conventional model under the same calculation accuracy.The mean value and the root mean square (RMS)of the vertical random vibration response for train-track-simply supported beam bridge,which are caused by deterministic load and track irregularities,respectively,were calculated.It can be seen that the vertical displacement of the bridge is mainly controlled by the weight of the train,but the excitation of track irregularity has little effect on it.The vertical acceleration of the bridge and car bodies are significantly influenced by track irregularities,and the improvement of the track condition can effectively improve the riding comfort.The RMS of the train-bridge coupled system random vibration and the discrete of the vibration caused by track irregularities increase with the acceleration of train speed.关键词
车/桥耦合振动/迭代模型/赫兹接触/虚拟激励法/简支梁桥Key words
train-bridge coupled vibration/iteration model/Hertz contact/pseudo excitation method/simply supported beam bridge分类
交通工程引用本文复制引用
朱志辉,王力东,龚威,余志武,蔡成标..基于改进迭代模型的车桥耦合系统竖向随机振动研究∗[J].湖南大学学报（自然科学版）,2016,43(11):120-130,11.基金项目
国家自然科学基金资助项目(51378511,51678576),National Natural Science Foundation of China(51378511,51678576) （51378511,51678576）
牵引动力国家重点实验室开放课题(TPL1601) （TPL1601）
