实测模态和结构模型同步修正的结构损伤识别方法

张 纯;宋固全;吴光宇

振动与冲击 ›› 2010, Vol. 29 ›› Issue (9) : 1-4.

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PDF(1224 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (9) : 1-4.
论文

实测模态和结构模型同步修正的结构损伤识别方法

  • 张 纯;宋固全;吴光宇
作者信息 +

Structure damage identification by synchronal updating of measured modal and finite element model

  • Zhang Chun; Song Gu-quan;Wu Guang-yu
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摘要

在基于灵敏度分析的有限元模型修正方法基础上,提出一种对实测模态和结构模型同步修正的结构损伤识别方法。即利用有损结构模态与测量噪声在时频域内的差异,以结构有限元模型为基准,对实测模态差进行小波去噪处理,再利用修正后的模态构造目标函数,进行有限元模型修正,经过迭代计算最终可识别结构的损伤。数值算例表明本文方法可有效降低噪声的影响,提高损伤识别的精度。

Abstract

This paper develops a damage identification method by synchronal updating of measured modal and finite element model based on the classic sensitivity-based model updating method. A wavelet de-noise treatment is proposed to reduce the noise in mode difference between measured modal and analysis modal of the
finite element model according to different time-frequency features between structural modal signal and noise. The de-noising modals are used to construct objective function and the optimal question is solved to update finite element model, then the structural damage can be identified through iterative process. The numerical cases show that the proposed method has a good de-nosing performance and can identify structural damage more accurately.

关键词

模型修正 / 小波去噪 / 损伤识别

Key words

model updating / wavelet denoise / damage identification

引用本文

导出引用
张 纯;宋固全;吴光宇. 实测模态和结构模型同步修正的结构损伤识别方法[J]. 振动与冲击, 2010, 29(9): 1-4
Zhang Chun;Song Gu-quan;Wu Guang-yu. Structure damage identification by synchronal updating of measured modal and finite element model[J]. Journal of Vibration and Shock, 2010, 29(9): 1-4

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