一种提高平稳随机载荷识别精度的方法

廖俊 蒋炳炎 时伟

振动与冲击 ›› 2013, Vol. 32 ›› Issue (16) : 176-181.

PDF(2724 KB)
PDF(2724 KB)
振动与冲击 ›› 2013, Vol. 32 ›› Issue (16) : 176-181.
论文

一种提高平稳随机载荷识别精度的方法

  • 廖俊1 蒋炳炎1 时伟2
作者信息 +

A way to improve stationary random loading identification accuracy

  • LIAO Jun1, JIANG Bingyan1, SHI Wei2
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文章历史 +

摘要

针对动态随机载荷识别结果在固有频率附近因传递函数矩阵病态而出现载荷识别误差较大的问题,在逆虚拟激励法的基础上提出一种条件数加权平均算法尝试改善识别的精度。方法用仿真和试验验证了对识别精度的改善效果。同时采用频响函数条件数的大小来作为判断识别结果可靠度和测点组合选择的一个参考,减少了工作量并取得了良好的识别效果。提出了一些实际操作中的建议,为工程实际提供参考。

Abstract

A condition number weighted average method is presented based on inverse pseudo-excitation method to reduce the identification error caused by the rank defect of the frequency response function matrix; simulation process is given to compare the result between the presented method and routine method. It proves the optimizing result by use of the method; experiments are designed to certify the feasibility of the algorithm, and achieve good results, and the ill-conditioning problem can be conquered to some extent. The condition number of FRF is used to choose the response measuring point ,it reduces the workload, and get a accurate result.

关键词

随机振动 / 载荷识别 / 虚拟激励法 / 矩阵病态 / 矩阵条件数

Key words

random vibration / loading identification / inverse pseudo-excitation method / ill condition for matrix / condition number.

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导出引用
廖俊 蒋炳炎 时伟. 一种提高平稳随机载荷识别精度的方法[J]. 振动与冲击, 2013, 32(16): 176-181
LIAO Jun;JIANG Bingyan;SHI Wei. A way to improve stationary random loading identification accuracy [J]. Journal of Vibration and Shock, 2013, 32(16): 176-181

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