【摘要】 基于环境激励的结构振动测试的方法中ERA方法是重要的时域分析方法。本文主要是以随机减量法(RD)和NExT两种数据处理方法结合ERA算法,对绥化学院正在建的网架结构的基本模态参数进行测试。通过分析比较得出RD/ERA和NExT/ERA较直接ERA有更高的精度,且实测分析结果与有限元分析结果较吻合。为网架结构在环境激励下用ERA方法测试模态参数提供了实验依据。更多还原

【Abstract】 Eigen-system realization algorithm is an important time domain method for structural modal parameter identification based on the ambient excitation.The outhors carry out the modal analysis and modal test for the spacial truss of Suihua University by using random decrement technique or natural excitation technique for data processing,then input the eigen-system realization algorithm for solving the modal parameters of the spacial truss.Comparisons by analysis show that RD / ERA and NExT / ERA have higher accuracy than the direct ERA,and the analysis results meet the finite element method results well.This paper provides an experimental basis for using ERA to test the modal parameters of the spacial trusses.更多还原