基于最小二乘复指数法辨识钢轨模态参数  

dentification of Rail Modal Parameters Based on Least Square Complex Exponential Method

作　　者：岳国栋 张霖霖 洪嘉希 张文献 YUE Guo-Dong;ZHANG Lin-Lin;HONG Jia-Xi;ZHANG Wen-Xian(School of Mechanical Engineering,Shenyang Jianzhu University,Shenyang Liaoning110168,China;Shenyang Railway Signal Co.,Ltd.,Shenyang Liaoning110025,China)

机构地区：[1]沈阳建筑大学机械工程学院,辽宁沈阳110168 [2]沈阳铁路信号有限公司,辽宁沈阳110025

出　　处：《机电产品开发与创新》2023年第3期88-92,共5页Development & Innovation of Machinery & Electrical Products

基　　金：国家自然科学基金(51705340)。

摘　　要：铁路天窗时间短,线路长,对模态实验的便捷性提出很高要求。为此,本文提出基于最小二乘复指数法(LSCE)和稳态图辨识钢轨模态参数。首先建立Beam梁模型,结合稳态图和LSCE辨识瞬态分析模态参数,与模态分析结果对比,验证所提出模态辨识算法正确性。其次,在铁路线路进行模态实验,LSCE算法与频响函数法识别频率结果的最大误差比为1.7%,验证所提算法适合铁路模态测试需求,能够便捷地进行钢轨模态实验。The time of railway skylight is short and the line is long,which requires high convenience of modal experiment.For this reason,this paper proposes to identify the modal parameters of the rail based on the least square complex exponential(LSCE)method and the stabilisation diagram.Firstly,the Beam model is established,and the modal parameters of transient analysis are identified by combining the stabilisation diagram and LSCE.The correctness of the proposed modal identification algorithm is verified by comparing with the modal analysis results.Secondly,the modal experiment on railway lines shows that the maximum error of frequency identification results between LSCE algorithm and frequency response function method is 1.7%,which verifies that the proposed algorithm is suitable for railway modal test and can conveniently carry out rail modal experiment.

关 键 词：轨道结构 模态参数 LSCE 有限单元法 实验模态分析 

分 类 号：U211.3[交通运输工程—道路与铁道工程]