传感技术学报Issue(2)：170-178,9.DOI:10.3969/j.issn.1004-1699.2015.02.004
基于环境激励的桥梁振动模态识别算法研究∗
A Bridge Modal Identification Algorithm Based on Ambient Excitation
摘要
Abstract
An online,real￣time analysis of the bridge vibration mode is often required during a bridge construction and maintenance. So a modal analysis algorithm with no human excitation is in urgent need. By researching the mathematical sense of NExT( Natural Excitation Technique) algorithm and ARMA model( Auto￣Regressive and Mov￣ing Average Model),a quick solution for NExT￣ARMA model is proposed on the basis of conventional algorithms. Compared to the traditional ambient modal analysis,this algorithm not only reduces the complexity of traditional method,but also build a feedback loop to improve the accuracy. Build a simply supported beam model both in AN￣SYS and real experimental platform to verify the algorithm. It shows that each mode of the bridge structure can be i￣dentified under nature white noise excitation. The relative error of the first three natural frequencies is 1% or less.关键词
桥梁结构/模态分析/自然环境激励法/自回归滑动平均模型Key words
bridge structures/modal analysis/natural excitation technique( NExT)/auto￣regressive and moving av￣erage model( ARMA)分类
建筑与水利引用本文复制引用
郑德智,李子恒,王豪..基于环境激励的桥梁振动模态识别算法研究∗[J].传感技术学报,2015,(2):170-178,9.基金项目
国家“863”计划(2014BAF08B01)；教育部新世纪人才资助项目；北京市支持中央高校共建项目(青年英才计划) （2014BAF08B01）
