| 基于变权优化的结构损伤识别方法 |
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| 引用本文： | 孙国,张亚辉,郭杏林.基于变权优化的结构损伤识别方法[J].计算力学学报,2008,25(Z1). |
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| 作者姓名： | 孙国 张亚辉 郭杏林 |
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| 作者单位： | 大连理工大学工业装备结构分析国家重点实验室工程力学系; |
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| 基金项目： | 国家自然科学基金
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| 摘 要： | 许多结构损伤识别方法通常归结为一个基于模态参数匹配的优化问题,测试信息的非完整性及测试噪音的影响经常导致解的非唯一性、解的高散性这样一些问题.基于这类目标函数构造格式的可变性,本文提出了基于变权优化的结构损伤识别方法,对不同误差函数分量进行变权综合,采用渐变的权重系数依次重构优化问题的目标函数,以顺序更新的初值进行优化问题求解,通过随机初值方法和最优灵敏度方法分析不同权重系数下解的不确定性特征,以降低特定误差函数可能存在的初值依赖性并改进识别精度,数值模拟算例显示这种方法的有效性.
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| 关 键 词： | 损伤识别 优化 变权 最优灵敏度 |
A structural damage identification method based on variable-weight optimization |
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| SUN Guo,ZHANG Ya-hui,GUO Xing-lin.A structural damage identification method based on variable-weight optimization[J].Chinese Journal of Computational Mechanics,2008,25(Z1). |
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| Authors: | SUN Guo ZHANG Ya-hui GUO Xing-lin |
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| Institution: | State Key Laboratory of Structural Analysis for Industrial Equipment;Dept.of Engineering Mechanics;Dalian University of Technology;Dalian 116024;China |
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| Abstract: | Many damage identification methods attempt to minimize a no-linear error function between the analytical and measured modal parameters.The main problem is the multiplicity of parameter estimation solutions arising from using spatially sparse and noised-polluted data.A new identification method based on variable-weight optimization is proposed according to the alterability of the error function composition.The method adopts a combined error function with variable weighting coefficient and changes the coeffic... |
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| Keywords: | damage identification optimization variable-weight Optimum Sensitivity |
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