基于环境激励的桥梁模态参数识别  

Modal Parameter Identification of a Bridge Under Ambient Excitation

作　　者：刘宗政[1,2] 陈恳[1] 郭隆德[2] 陈振华[1,2] 陈雁[1] 

机构地区：[1]清华大学精密仪器与机械学系,北京100084 [2]中国空气动力研究与发展中心,绵阳621000

出　　处：《振动．测试与诊断》2010年第3期300-303,共4页Journal of Vibration,Measurement & Diagnosis

摘　　要：介绍了获取桥梁模态参数的试验手段,阐述了环境激励的桥梁模态参数的识别方法,通过移动测量方法测试了基于环境激励的某桥梁,并采用自功率谱、互功率谱和相干函数分析,识别了桥梁振动的前3阶振动频率、阻尼比和振型。结果表明,试验得到的桥梁模态参数与设计参数基本相同,桥梁性能良好。This paper describes a movable measuring method which is employed to measures the response signals of a bridge under ambient excitation.auto-power spectrum analysis,cross-power spectrum analysis and coherence function analysis are applied to identify the first three orders of vibration frequencies,damping ratio and vibration shape.The results show that the method is effective.

关 键 词：环境激励 桥梁 模态 功率谱 

分 类 号：O327[理学—一般力学与力学基础] U446[理学—力学]