基于工作应变模态损伤识别方法的试验研究

顾培英;邓昌;汤雷;

振动与冲击 ›› 2011, Vol. 30 ›› Issue (11) : 175-178.

PDF(1132 KB)
PDF(1132 KB)
振动与冲击 ›› 2011, Vol. 30 ›› Issue (11) : 175-178.
论文

基于工作应变模态损伤识别方法的试验研究

  • 顾培英1,2; 邓昌1,2; 汤雷1,2
作者信息 +

Experimental study of damage identification based on operational strain mode shape

  • Gu Pei-ying1,2 ; Deng Chang1,2; Tang Lei1,2
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摘要

首先介绍了笔者近几年提出的工作应变模态频域识别方法、基于损伤应变模态差分原理的损伤位置直接指标法、基于局域应变模态面积的损伤程度直接指标法。为了验证所提方法,开展了悬臂梁多损伤物理模型试验及数值仿真计算分析,结果表明,利用该方法识别出的工作应变模态与锤击激励下的应变模态形状相似。初步验证并完善了损伤位置、损伤程度直接指标法。位于损伤处的损伤位置直接指标值远大于非损伤处指标值,识别出的损伤位置与实际损伤位置一致;同一损伤量下的损伤程度指标值变化不大,与损伤位置、模态阶数、是否归一化无关;对于多损伤结构,只要损伤间距大于影响区范围,损伤位置、损伤程度即可按单损伤方法确定。

Abstract

Operational strain mode shape (OSMS), direct index methods of damage location detection (named as ) and damage degree detection (named as ) are introduced in the paper. The methods were advanced in recent years by author. Then, the results of model test and numerical simulation are applied to verify the methods. The results show that the operational strain mode shape is similar to the strain mode shape under impact excitation. According to the results, direct index methods of damage location detection and damage degree detection are also improved. The direct index value of damage location detection at damage location is greater than the index value at undamage location, and, the damage location detected is in accord with actual damage location. Furthermore, when damage degree is equal, the variation of is slight. The value of is independent of damage location, order number of strain mode shape and normalization. If the space between of damages is longer than length affected, the methods can be applied to the multi-damage detection of structure.

关键词

环境激励 / 工作应变模态 / 损伤识别 / 直接指标法

Key words

ambient excitation / operational strain mode shape / damage identification / direct index method

引用本文

导出引用
顾培英;邓昌;汤雷;. 基于工作应变模态损伤识别方法的试验研究[J]. 振动与冲击, 2011, 30(11): 175-178
Gu Pei-ying;;Deng Chang;Tang Lei;. Experimental study of damage identification based on operational strain mode shape[J]. Journal of Vibration and Shock, 2011, 30(11): 175-178

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