动态载荷激励位置时域识别技术研究

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (17) : 74-78.

论文

动态载荷激励位置时域识别技术研究

祝德春1,2 张方2,姜金辉２，张卫民１

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Study of time-domain identification technology of dynamic load location

ZHU De-chun1,2 ZHANG Fang２，ＪＩＡＮＧＪｉｎｈｕｉ２，ＺＨＡＮＧＷｅｉｍｉｎ1

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摘要

对实测振动加速度信号进行分析，采用基于盖尔圆定理的GDE算法识别作用于结构的动态载荷数量；在此基础上，建立结构有限元模型，运用基于正交多项式拟合的动态载荷时域识别方法拟合虚拟激励位置处的当量动态载荷，基于优化理论建立动态载荷位置时域识别的数学模型，计算该模型结果向量的均方根值并将其作为识别动态载荷激励位置的判别依据，提出了动态载荷激励位置识别的均值判别系数法。仿真和试验结果均表明方法正确可行，可用于线弹性系统多个谐波载荷或任意形式时变动态载荷的激励位置识别。

Abstract

The actual measured vibration acceleration signal was analyzed and the dynamic load quantity was identified by GDE algorithm based on Gerschgorin’s Disk Theorem. The structural finite element model was built, then the dynamic load identification method in time-domain fitted based on orthogonal polynomial was used to fit the equivalent dynamic load on virtual location. The mathematical model of dynamic load location identification in time-domain was built based on optimization theory. The root mean square value of vector of the model result was calculated, which was used as distinguish basis to identify dynamic load location. The mean value discriminating coefficient solution of dynamic load location identification was proposed. Computer simulation and experimental results show that the method is correct and feasible to idetntify the location of one or more harmonic load or arbitrary time-varying dynamic load.

导出引用

祝德春; 张方;姜金辉;张卫民. 动态载荷激励位置时域识别技术研究[J]. 振动与冲击, 2013, 32(17): 74-78

ZHU De-chun; ZHANG Fang;ＪＩＡＮＧＪｉｎｈｕｉ;ＺＨＡＮＧＷｅｉｍｉｎ. Study of time-domain identification technology of dynamic load location[J]. Journal of Vibration and Shock, 2013, 32(17): 74-78