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Structural condition assessment is crucial for ensuring the safe services of structures, with structural damage detection (SDD) being a core component. In this paper, a novel SDD method is proposed based on the adaptive grasshopper algorithm and sparse regularization. It aims to tackle accuracy decline of SDD results and instability involving uncertainties and incomplete measurement, thereby achieving sparse-regularization-based structural condition assessment. Firstly, adaptive Lévy flight and elite opposition-based learning strategies are incorporated into the adaptive grasshopper algorithm to prevent the SDD process from falling into local optima and to enhance the stability of SDD results. Secondly, a modal parameter-based objective function with sparse regularization is formulated to increase the sparsity of SDD results, thereby improving SDD accuracy and robustness. The optimization results of competition-based evolutionary computation benchmark functions show that the adaptive grasshopper algorithm exhibits better global convergence and identification stability compared with its standard version. Numerical and experimental results for simply-supported beams indicate that the proposed method can ensure reliable SDD accuracy even in the case of incomplete measurements, and it possesses good noise robustness as well.
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结构状态评估对于保障结构安全服役至关重要,其中结构损伤识别是核心环节。针对测量不确定性及不完备性容易引发的结构损伤识别不适定性问题,提出一种基于自适应蝗虫算法与稀疏正则化的结构损伤识别方法,以获得精确可靠的结构损伤识别结果。首先,自适应蝗虫算法引入了自适应Lévy飞行和精英反向学习策略,避免结构损伤识别陷入局部最优,以提高识别结果稳定性;其次,融合了稀疏正则化构造模态参数型目标函数,通过提高结构损伤识别解的稀疏度以实现识别精度和鲁棒性的提高。基准函数测试表明,自适应蝗虫算法相比标准算法具有更好的全局收敛性和识别稳定性。简支梁的数值与试验结果表明,所提方法在不完备测量情况下仍可保证可靠的结构损伤识别精度,并且具有良好的噪声鲁棒性。
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Flowchart of SDD based on IGOA-ALOL and sparse regularization, figureFileSmall=DDnmmv/5CSzh3YcVal9+OA==, figureFileBig=ZNLrCKg3ByLv9/ewMCLRLw==, tableContent=null), ArticleFig(id=1243226227457245978, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=CN, label=图1, caption=
基于自适应蝗虫算法的SDD稀疏正则化方法流程, figureFileSmall=DDnmmv/5CSzh3YcVal9+OA==, figureFileBig=ZNLrCKg3ByLv9/ewMCLRLw==, tableContent=null), ArticleFig(id=1243226228342244148, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=EN, label=Fig. 2, caption=
Boxplot of optimal results for 10 independent runs, figureFileSmall=Yqk4xfJlgYgl8d5x6ilOJw==, figureFileBig=VfoBYhFaN6hXGRlIkIqgcg==, tableContent=null), ArticleFig(id=1243226228711342908, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=CN, label=图2, caption=
10次独立运行结果箱形图, figureFileSmall=Yqk4xfJlgYgl8d5x6ilOJw==, figureFileBig=VfoBYhFaN6hXGRlIkIqgcg==, tableContent=null), ArticleFig(id=1243226229105607492, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=EN, label=Fig. 3, caption=
FE model of a 20-element simply-supported beam, figureFileSmall=gp7wq6w1hgjwMBDXbctbYg==, figureFileBig=Om+yEJCjKytyxNgbuP2Ang==, tableContent=null), ArticleFig(id=1243226229445346125, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=CN, label=图3, caption=
简支梁数值仿真模型, figureFileSmall=gp7wq6w1hgjwMBDXbctbYg==, figureFileBig=Om+yEJCjKytyxNgbuP2Ang==, tableContent=null), ArticleFig(id=1243226229734753110, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=EN, label=Fig. 4, caption=
SDD results for different damage cases, figureFileSmall=PjnP07caKUK1d15HyQ45gQ==, figureFileBig=WRICFINeMRo9TeAq9UuIjg==, tableContent=null), ArticleFig(id=1243226230175155036, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=CN, label=图4, caption=
不同工况的结构损伤识别结果, figureFileSmall=PjnP07caKUK1d15HyQ45gQ==, figureFileBig=WRICFINeMRo9TeAq9UuIjg==, tableContent=null), ArticleFig(id=1243226230443590498, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=EN, label=Fig. 5, caption=
SDD results of IGOA-ALOL compared to other swarm intelligence algorithms, figureFileSmall=wYFj1WBE0pi6TFaaMxCwug==, figureFileBig=iM9spzZk048QM0fpd5aeFQ==, tableContent=null), ArticleFig(id=1243226231026598762, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=CN, label=图5, caption=
IGOA-ALOL与其他算法的结构损伤识别结果, figureFileSmall=wYFj1WBE0pi6TFaaMxCwug==, figureFileBig=iM9spzZk048QM0fpd5aeFQ==, tableContent=null), ArticleFig(id=1243226231316005743, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=EN, label=Fig. 6, caption=
SDD results with L1 regularization, figureFileSmall=06QZhjt6sioYIfckWWs0Dw==, figureFileBig=vKHS9lpBmTrf+tpIaPrbsQ==, tableContent=null), ArticleFig(id=1243226231819322234, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=CN, label=图6, caption=
引入L1正则化后的结构损伤识别结果, figureFileSmall=06QZhjt6sioYIfckWWs0Dw==, figureFileBig=vKHS9lpBmTrf+tpIaPrbsQ==, tableContent=null), ArticleFig(id=1243226232100340607, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=EN, label=Fig. 7, caption=
SDD results based on IGOA-ALOL under noise, figureFileSmall=du5x17nI9/QWLlf6TeYSBg==, figureFileBig=7DQBjoWtZEvjd3xxqFJWJw==, tableContent=null), ArticleFig(id=1243226232427496322, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=CN, label=图7, caption=
基于IGOA-ALOL的噪声工况结构损伤识别结果, figureFileSmall=du5x17nI9/QWLlf6TeYSBg==, figureFileBig=7DQBjoWtZEvjd3xxqFJWJw==, tableContent=null), ArticleFig(id=1243226232897258379, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=EN, label=Fig. 8, caption=
Diagram of experimental structure, experimental devices and damage settings, figureFileSmall=JLa7eMvt7Xg1B3nFVmnehQ==, figureFileBig=1h1aOJVZnuvNvruDm06jSA==, tableContent=null), ArticleFig(id=1243226233291522960, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=CN, label=图8, caption=
实验模型、实验设备与损伤设置图, figureFileSmall=JLa7eMvt7Xg1B3nFVmnehQ==, figureFileBig=1h1aOJVZnuvNvruDm06jSA==, tableContent=null), ArticleFig(id=1243226233631261587, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=EN, label=Fig. 9, caption=
SDD results of experimental structure, figureFileSmall=V37Hi+uRtJDGgtGJXbGGhw==, figureFileBig=UojALCXVTuKNBxv50b5tzg==, tableContent=null), ArticleFig(id=1243226233924862871, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=CN, label=图9, caption=
实验结构的结构损伤识别结果, figureFileSmall=V37Hi+uRtJDGgtGJXbGGhw==, figureFileBig=UojALCXVTuKNBxv50b5tzg==, tableContent=null), ArticleFig(id=1243226234361070496, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=EN, label=Tab. 1, caption=
Pseudo codes of IGOA-ALOL
, figureFileSmall=null, figureFileBig=null, tableContent=
| 输入:种群数量N,最大迭代次数L |
| 输出:最优蝗虫个体αopt |
| 1. | 初始化种群 |
| 2. | 计算每个个体的适应度值 |
| 3. | αopt=最佳蝗虫个体 |
| 4. | While l<L |
| 5. | | 更新参数cl的值 |
| 6. | | for each bgi∈BG |
| 7. | | | 计算并归一化蝗虫之间的距离到区间[1,4] |
| 8. | | | 根据公式更新每一个蝗虫的位置 |
| 9. | | | 执行自适应Lévy飞行策略 |
| 10. | | end for |
| 11. | | 对当前迭代的精英个体执行精英反向学习策略 |
| 12. | | 更新全局最优个体αopt |
| 13. | | l=l+1 |
| 14. | end while |
| 15. | 返回全局最优位置αopt |
), ArticleFig(id=1243226234805666726, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=CN, label=表1, caption=
IGOA-ALOL伪代码
, figureFileSmall=null, figureFileBig=null, tableContent=
| 输入:种群数量N,最大迭代次数L |
| 输出:最优蝗虫个体αopt |
| 1. | 初始化种群 |
| 2. | 计算每个个体的适应度值 |
| 3. | αopt=最佳蝗虫个体 |
| 4. | While l<L |
| 5. | | 更新参数cl的值 |
| 6. | | for each bgi∈BG |
| 7. | | | 计算并归一化蝗虫之间的距离到区间[1,4] |
| 8. | | | 根据公式更新每一个蝗虫的位置 |
| 9. | | | 执行自适应Lévy飞行策略 |
| 10. | | end for |
| 11. | | 对当前迭代的精英个体执行精英反向学习策略 |
| 12. | | 更新全局最优个体αopt |
| 13. | | l=l+1 |
| 14. | end while |
| 15. | 返回全局最优位置αopt |
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Damage cases
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| 工况 | 类型 | 损伤程度@损伤单元 |
|---|
| 1 | 单损伤 | 10%@E10 |
| 2 | 两损伤-非对称 | 10%@E10,10%@E16 |
| 3 | 两损伤-对称 | 15%@E6,15%@E16 |
| 4 | 三损伤 | 20%@E6,25%@E11,15%@E16 |
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损伤工况
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| 工况 | 类型 | 损伤程度@损伤单元 |
|---|
| 1 | 单损伤 | 10%@E10 |
| 2 | 两损伤-非对称 | 10%@E10,10%@E16 |
| 3 | 两损伤-对称 | 15%@E6,15%@E16 |
| 4 | 三损伤 | 20%@E6,25%@E11,15%@E16 |
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DVC100 values of different damage cases
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| | 工况1 | 工况2 | 工况3 | 工况4 |
|---|
| GOA | 0% | 0% | 0% | 0% |
| IGOA-AL | 45% | 14% | 10% | 6% |
| IGOA-OL | 39% | 22% | 16% | 2% |
| IGOA-ALOL | 85% | 61% | 39% | 14% |
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不同损伤工况的DVC100值
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| | 工况1 | 工况2 | 工况3 | 工况4 |
|---|
| GOA | 0% | 0% | 0% | 0% |
| IGOA-AL | 45% | 14% | 10% | 6% |
| IGOA-OL | 39% | 22% | 16% | 2% |
| IGOA-ALOL | 85% | 61% | 39% | 14% |
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DVC100 values of different damage cases
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| | 工况1 | 工况2 | 工况3 | 工况4 |
|---|
| GOA | 1% | 0% | 0% | 1% |
| IGOA-AL | 88% | 54% | 90% | 53% |
| IGOA-OL | 11% | 0% | 45% | 10% |
| IGOA-ALOL | 95% | 67% | 92% | 80% |
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不同损伤工况的DVC100值
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| | 工况1 | 工况2 | 工况3 | 工况4 |
|---|
| GOA | 1% | 0% | 0% | 1% |
| IGOA-AL | 88% | 54% | 90% | 53% |
| IGOA-OL | 11% | 0% | 45% | 10% |
| IGOA-ALOL | 95% | 67% | 92% | 80% |
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Parameters before and after updating
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| 模型修正参数 | 初始值 | 修正值 | 变化率 |
|---|
| ρA/kg•m-1 | 9.0792 | 7.9325 | -12.63% |
| EI/N•m2 | 159950 | 140560 | 12.12% |
| kv/N•m-1 | ∞ | 5.330e+8 | - |
| kr/N•rad-1 | 0 | 3.785e+6 | - |
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简支梁模型修正前后参数对比
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| 模型修正参数 | 初始值 | 修正值 | 变化率 |
|---|
| ρA/kg•m-1 | 9.0792 | 7.9325 | -12.63% |
| EI/N•m2 | 159950 | 140560 | 12.12% |
| kv/N•m-1 | ∞ | 5.330e+8 | - |
| kr/N•rad-1 | 0 | 3.785e+6 | - |
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Experimental and calculated frequencies
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| 阶次 | 实测值/Hz | 修正前 | 修正后 |
|---|
| 计算值/Hz | 误差 | 计算值 | 误差 |
|---|
| 1 | 23.778 | 23.092 | 2.89% | 23.778 | 0.00% |
| 2 | 89.058 | 92.367 | 3.72% | 89.058 | 0.00% |
| 3 | 188.612 | 207.832 | 10.19% | 188.612 | 0.00% |
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实测频率和模型计算频率
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| 阶次 | 实测值/Hz | 修正前 | 修正后 |
|---|
| 计算值/Hz | 误差 | 计算值 | 误差 |
|---|
| 1 | 23.778 | 23.092 | 2.89% | 23.778 | 0.00% |
| 2 | 89.058 | 92.367 | 3.72% | 89.058 | 0.00% |
| 3 | 188.612 | 207.832 | 10.19% | 188.612 | 0.00% |
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Damage cases and corresponding frequencies
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| 工况 | 裂纹深度@损伤位置 | 估计损伤程度@损伤单元 | 测量频率/Hz |
|---|
| 1阶 | 2阶 | 3阶 |
|---|
| 1 | 20 mm@0.4 | 89.1%@3 | 23.236 | 82.886 | 172.675 |
| 2 | 30 mm@0.4 | 95.2%@3 | 22.787 | 78.817 | 165.016 |
| 3 | 30 mm@0.4 | 95.2%@3 | 22.096 | 75.093 | 161.514 |
| 3 mm@2.2 | 70.1%@15 |
| 4 | 30 mm@0.4 | 95.2%@3 | 21.067 | 70.828 | 158.006 |
| 20 mm@2.2 | 89.1%@15 |
), ArticleFig(id=1243226239067079658, tenantId=1146029695717560320, journalId=1242798230522609684, articleId=1243226199305076982, language=CN, label=表7, caption=
实验损伤工况及对应测量频率
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| 工况 | 裂纹深度@损伤位置 | 估计损伤程度@损伤单元 | 测量频率/Hz |
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| 1阶 | 2阶 | 3阶 |
|---|
| 1 | 20 mm@0.4 | 89.1%@3 | 23.236 | 82.886 | 172.675 |
| 2 | 30 mm@0.4 | 95.2%@3 | 22.787 | 78.817 | 165.016 |
| 3 | 30 mm@0.4 | 95.2%@3 | 22.096 | 75.093 | 161.514 |
| 3 mm@2.2 | 70.1%@15 |
| 4 | 30 mm@0.4 | 95.2%@3 | 21.067 | 70.828 | 158.006 |
| 20 mm@2.2 | 89.1%@15 |
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