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移动随机荷载作用下梁桥非平稳随机振动的PEM-FFT方法
PEM-FFT for Non-stationary Random Vibration Analysis of Simple-supported Beam Bridge under Moving Random Load
投稿时间:2017-09-25  修订日期:2017-10-30
DOI:
中文关键词:  移动随机载荷  非平稳  随机振动  频域分析
英文关键词:moving random load  non-stationary  random vibration  frequency domain
基金项目:
作者单位E-mail
赵岩 大连理工大学力学系 yzhao@dlut.edu.cn 
摘要点击次数: 24
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中文摘要:
      针对移动随机载荷作用下桥梁结构非平稳随机振动问题,建立了一种基于频域分析的虚拟激励-傅里叶变换方法(PEM-FFT)。与通常的非平稳随机振动的时频分析方法不同,提出的方法完全在频域上执行。其主要特色是能够给出了随机输入与随机输出的频域显示关系,表明移动载荷作用下结构非平稳随机振动分析仅需要对载荷的确定性“移动函数项”进行计算。数值算例考虑了等截面/变截面简支梁受移动随机载荷作用问题,首先与通常的时频分析方法进行对比验证PEM-FFT方法的正确性和有效性,进一步讨论了不同结构形式以及不同载荷移动速度对于响应演变统计量的影响。
英文摘要:
      A frequency domain analysis method for non-stationary random vibration of bridge structures under moving random loads is presented. Unlike the time-frequency analysis methods for non-stationary random vibration, the proposed method is fully implemented in frequency domain. One of the main features of this method is capable of getting the relationship between random input and random output in frequency domain, which shows that non-stationary random vibration analysis of moving load only needs to compute the ‘moving function item’ as the determined part of input loads. The numerical examples consider a simple-supported beam which has a constant or variable cross section under moving random load. First of all, the time-frequency analysis method is used to compare and confirm the correctness and validity of the proposed method, and then the effect of the moving loads with different speed and structures on the response of the statistical variables is discussed.
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