基于模型修正的钢管焊接结构焊缝损伤识别

李世龙;马立元;李永军;王天辉

振动与冲击 ›› 2012, Vol. 31 ›› Issue (15) : 127-131.

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PDF(1522 KB)
振动与冲击 ›› 2012, Vol. 31 ›› Issue (15) : 127-131.
论文

基于模型修正的钢管焊接结构焊缝损伤识别

  • 李世龙,马立元,李永军,王天辉
作者信息 +

Damage detection of weld seam damage on steel tube welded structures by Model Updating

  • Li Shi-long, Ma Li-yuan, Li Yong-jun, Wang Tian-hui
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摘要

摘要:本文提出了一种基于模型修正的钢管焊接结构焊缝损伤识别方法。利用从发射台骨架试验模型获取的模态参数,选择识别结果中精度较好的模态频率作为模型修正的基准频率。通过对待修正参数的灵敏度分析,运用ANSYS和MATLAB软件对有限元模型进行了修正。以实测模态和计算模态之间的误差建立一个带约束边界非线性最小二乘目标函数,将损伤识别问题转化为优化问题,并采用信赖域方法求解该优化问题。以有限元模型焊接结点单元组弹性模量的降低模拟焊缝损伤,并假定了两种损伤工况,通过对发射台骨架模型的数值仿真及试验研究,结果表明本文提出的损伤识别方法识别效果较为理想,为解决这种复杂焊接结构焊缝损伤识别问题提供了新的思路。

Abstract

Abstract:A new method for weld seam damage detection on steel tube welded structures based on model updating is proposed in this paper. The identified frequencies which are more accurate are selected as updating parameters, then the initial finite element model is updated by Ansys and Matlab based on sensitivity analysis. The objective function is defined as an nonlinear Ieast-squares problem with bound-constrains and for detection of the location of structural damage by minimizing the sum of differences between the experimental and analytical modal date, then the detection problem is transformed into an optimization problem in this method, and the trust-region approaching method is then used to solve the minimization problem. Finally, the proposed method is applied for damage detection on the frame of a launch platform. The elastic modulus reduction of jointing crunodes elements group is taken to simulate the weld seam damage state and two cases are investigated. The simulation and experimentation results show that the proposed method is well suitable for weld seam damage detection on such complex steel tube welded structures.

关键词

发射台骨架 / 焊缝损伤 / 模型修正 / 信赖域 / 损伤识别

Key words

frame of a launch platform / weld seam damage / model updating / trust region / damage detection

引用本文

导出引用
李世龙;马立元;李永军;王天辉. 基于模型修正的钢管焊接结构焊缝损伤识别[J]. 振动与冲击, 2012, 31(15): 127-131
Li Shi-long;Ma Li-yuan;Li Yong-jun;Wang Tian-hui . Damage detection of weld seam damage on steel tube welded structures by Model Updating[J]. Journal of Vibration and Shock, 2012, 31(15): 127-131

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