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Aiming at the problems of traditional impact load identification methods, such as the requirement for a large number of sensors, high sampling frequency, and low identification accuracy, a new impact load identification method based on empirical mode decomposition (EMD) technology was proposed.The EMD technology was used to decompose the complete impact response to obtain the modal acceleration response. The impact location was quickly realized by measuring the collinearity between the uncorrected mode shape vector and the column vector of the mode shape matrix in the modal acceleration response. According to the positioning results, an optimization objective function was constructed. The time history of the impact load was fitted by using the Gaussian basis function, and the optimal fitting parameters were quickly solved by using the two-dimensional gradient descent method.Tests conducted on a cantilever plate with dimensions of 600 mm×200 mm×3 mm show that with only one accelerometer, the success rate of 36 impact positioning tests is 91.67%. The peak relative error and relative error index of the reconstruction results are less than 10% and 40%, respectively.
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针对传统冲击载荷识别方法所需传感器数量多、采样频率高以及识别精度低等问题,提出了一种基于经验模态分解技术的冲击载荷识别新方法。利用经验模态分解技术分解了完整的冲击响应,并获取了模态加速度响应,通过度量模态加速度响应中未校正振型向量和振型矩阵列向量的共线性即可快速实现冲击定位。根据定位结果,构建了优化目标函数,采用高斯基函数对冲击载荷时间历程进行了拟合,并利用二维梯度下降法快速求解了最优拟合参数。在尺寸为600 mm×200 mm×3 mm的悬臂板上进行的试验表明,在仅使用一个加速度计的前提下,36次冲击定位测试的成功率为91.67%,并且重构结果的峰值相对误差和相对误差指标分别低于10%和40%。
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刘玲,女,1989年生,湖北钟祥人,硕士研究生,讲师;主要研究方向为机械强度与有限元分析;E-mail:liuling@jcut.edu.cn。
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刘玲,女,1989年生,湖北钟祥人,硕士研究生,讲师;主要研究方向为机械强度与有限元分析;E-mail:liuling@jcut.edu.cn。
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58(3):157-166.(In Chinese), articleTitle=Research on impact force reconstruction based on improved function fitting method, refAbstract=null)], funds=[Fund(id=1241451352493183204, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, awardId=2025AFC005, language=EN, fundingSource=Natural Science Foundation of Hubei Province(2025AFC005), fundOrder=null, country=null), Fund(id=1241451352589652201, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, awardId=2025AFC005, language=CN, fundingSource=湖北省自然科学基金项目(2025AFC005), fundOrder=null, country=null), Fund(id=1241451352669343980, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, awardId=2024ZDYF004, language=EN, fundingSource=Jingmen Major Science and Technology Innovation Plan Project(2024ZDYF004), fundOrder=null, country=null), Fund(id=1241451352778395889, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, awardId=2024ZDYF004, language=CN, fundingSource=荆门市重大科技创新计划项目(2024ZDYF004), fundOrder=null, country=null), Fund(id=1241451352845504760, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, awardId=2024YDKY233, language=EN, fundingSource=Jingmen Science and Technology Plan Project(2024YDKY233), fundOrder=null, country=null), Fund(id=1241451353017471228, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, awardId=2024YDKY233, language=CN, fundingSource=荆门市科技计划项目(2024YDKY233), fundOrder=null, country=null), Fund(id=1241451353088774400, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, awardId=YY202444, language=EN, fundingSource=Jingchu University of Technology Doctoral Startup Fund Project(YY202444), fundOrder=null, country=null), Fund(id=1241451353202020611, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, awardId=YY202444, language=CN, fundingSource=2024年荆楚理工学院博士启动金项目(YY202444), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1241451344670807027, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, xref=null, ext=[AuthorCompanyExt(id=1241451344679195637, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, companyId=1241451344670807027, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=College of Intelligent Manufacturing, Jingchu University of Technology, Jingmen 448000, China), AuthorCompanyExt(id=1241451344695972855, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, companyId=1241451344670807027, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=荆楚理工学院 智能制造学院,荆门 448000)])], figs=[ArticleFig(id=1241451348500205691, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=EN, label=Fig.1, caption=
Overall flow chart of impact load identification method using modal acceleration response, figureFileSmall=hRJRmRS4F/Fc56/wlz8bVw==, figureFileBig=yw/njHs6/HB01rq7OIgoeA==, tableContent=null), ArticleFig(id=1241451348600868991, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=CN, label=图1, caption=
利用模态加速度响应的冲击载荷识别方法整体流程图, figureFileSmall=hRJRmRS4F/Fc56/wlz8bVw==, figureFileBig=yw/njHs6/HB01rq7OIgoeA==, tableContent=null), ArticleFig(id=1241451348747669640, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=EN, label=Fig.2, caption=
Test setup of the cantilever plate, figureFileSmall=7SMHYF05Lt93tMt9WWagKA==, figureFileBig=y+O4FLbYzvix7NroiSGC2Q==, tableContent=null), ArticleFig(id=1241451348860915854, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=CN, label=图2, caption=
悬臂板试验装置, figureFileSmall=7SMHYF05Lt93tMt9WWagKA==, figureFileBig=y+O4FLbYzvix7NroiSGC2Q==, tableContent=null), ArticleFig(id=1241451348940607633, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=EN, label=Fig.3, caption=
Modal test results of the cantilever plate, figureFileSmall=z3GFSwFnDEDvXM/rWYQ8Qg==, figureFileBig=kGQSFuEzuzb/gOqpUmG1fQ==, tableContent=null), ArticleFig(id=1241451349045465238, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=CN, label=图3, caption=
悬臂板模态测试结果, figureFileSmall=z3GFSwFnDEDvXM/rWYQ8Qg==, figureFileBig=kGQSFuEzuzb/gOqpUmG1fQ==, tableContent=null), ArticleFig(id=1241451349171294364, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=EN, label=Fig.4, caption=
Acceleration response of point 6# under impact load, figureFileSmall=///ImLJjXr8R05J9+p1kYg==, figureFileBig=KFRSmWBGNdgEo7yW+4MiFA==, tableContent=null), ArticleFig(id=1241451349267763359, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=CN, label=图4, caption=
6#点受冲击载荷作用时的加速度响应, figureFileSmall=///ImLJjXr8R05J9+p1kYg==, figureFileBig=KFRSmWBGNdgEo7yW+4MiFA==, tableContent=null), ArticleFig(id=1241451349355843746, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=EN, label=Fig.5, caption=
Modal acceleration responses of the plate, figureFileSmall=cg7FrFctEJxJWRjbuVfZQg==, figureFileBig=yr5WNW1CKg5Q7IW5efXVpg==, tableContent=null), ArticleFig(id=1241451349439729832, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=CN, label=图5, caption=
板的模态加速度响应, figureFileSmall=cg7FrFctEJxJWRjbuVfZQg==, figureFileBig=yr5WNW1CKg5Q7IW5efXVpg==, tableContent=null), ArticleFig(id=1241451349594919084, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=EN, label=Fig.6, caption=
Impact localization result of point 6#, figureFileSmall=qHJI1kYNtZrEZJAweeQ5iQ==, figureFileBig=Hm3RS5Co5DPH7+dC4s11Cg==, tableContent=null), ArticleFig(id=1241451349712359599, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=CN, label=图6, caption=
6#点冲击载荷定位结果, figureFileSmall=qHJI1kYNtZrEZJAweeQ5iQ==, figureFileBig=Hm3RS5Co5DPH7+dC4s11Cg==, tableContent=null), ArticleFig(id=1241451349825605813, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=EN, label=Fig.7, caption=
Impact load localization results for 11 remaining potential impact positions of cantilever plate, figureFileSmall=1nVY7bLGqSYqhTnQ9gEiGQ==, figureFileBig=QOSNjeL+uiz4CIEZqNb00A==, tableContent=null), ArticleFig(id=1241451351360721082, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=CN, label=图7, caption=
悬臂板剩余11个潜在冲击位置的冲击载荷定位结果, figureFileSmall=1nVY7bLGqSYqhTnQ9gEiGQ==, figureFileBig=QOSNjeL+uiz4CIEZqNb00A==, tableContent=null), ArticleFig(id=1241451351494938817, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=EN, label=Fig.8, caption=
Reconstruction results of impact load time history, figureFileSmall=OPJdf14dz6dKPuYY1ubKtw==, figureFileBig=s8H2fqtyP/p+/Ev7YQprCg==, tableContent=null), ArticleFig(id=1241451351616573638, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=CN, label=图8, caption=
冲击载荷时间历程重构结果, figureFileSmall=OPJdf14dz6dKPuYY1ubKtw==, figureFileBig=s8H2fqtyP/p+/Ev7YQprCg==, tableContent=null), ArticleFig(id=1241451351729819849, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=EN, label=Tab.1, caption=
Physical parameters of cantilever plate
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数Parameter | 值Value |
|---|
| 长度Length /mm | 600 |
| 宽度Width /mm | 200 |
| 厚度Thickness /mm | 3 |
| 弹性模量Elastic modulus /GPa | 70 |
| 泊松比Poisson ratio | 0.3 |
| 密度Density /(kg/m3) | 2 700 |
), ArticleFig(id=1241451351843066059, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=CN, label=表1, caption=
悬臂板的物理参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数Parameter | 值Value |
|---|
| 长度Length /mm | 600 |
| 宽度Width /mm | 200 |
| 厚度Thickness /mm | 3 |
| 弹性模量Elastic modulus /GPa | 70 |
| 泊松比Poisson ratio | 0.3 |
| 密度Density /(kg/m3) | 2 700 |
), ArticleFig(id=1241451351935340751, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=EN, label=Tab.2, caption=
Impact localization results under different hammer types
, figureFileSmall=null, figureFileBig=null, tableContent=
锤头类型 Hammer type | 成功定位数/总数 Successful locations/Total | 成功率 Success trate/% |
|---|
| 铝合金Aluminum alloy | 12/12 | 100 |
| 尼龙Nylon | 12/12 | 100 |
| 橡胶Rubber | 9/12 | 75 |
), ArticleFig(id=1241451352002449618, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=CN, label=表2, caption=
不同锤头类型下的冲击定位结果
, figureFileSmall=null, figureFileBig=null, tableContent=
锤头类型 Hammer type | 成功定位数/总数 Successful locations/Total | 成功率 Success trate/% |
|---|
| 铝合金Aluminum alloy | 12/12 | 100 |
| 尼龙Nylon | 12/12 | 100 |
| 橡胶Rubber | 9/12 | 75 |
), ArticleFig(id=1241451352103112919, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=EN, label=Tab.3, caption=
Reconstruction results of impact load time history for cantilever plate
, figureFileSmall=null, figureFileBig=null, tableContent=
冲击点序号 Impact point No. | 冲击载荷幅值 Impact load amplitude/N | 最优拟合参数 Optimal fitting parameters | ePRE/% | eRE/% |
|---|
真实值 True value | 重构值 Reconstruction value | μo | σo/10-4 |
|---|
| 1# | 35.12 | 32.45 | 0.813 4 | 1.5 | 7.60 | 39.67 |
| 2# | 21.50 | 22.46 | 0.958 8 | 2.0 | 4.47 | 32.15 |
| 3# | 41.30 | 38.43 | 0.924 6 | 1.6 | 6.95 | 31.54 |
| 4# | 25.87 | 27.14 | 0.864 4 | 1.8 | 4.91 | 28.73 |
| 5# | 47.21 | 48.68 | 0.670 0 | 1.7 | 3.11 | 34.33 |
| 6# | 35.92 | 37.21 | 0.872 0 | 1.8 | 3.59 | 37.18 |
| 7# | 43.67 | 41.52 | 0.876 4 | 1.9 | 4.92 | 31.91 |
| 8# | 28.13 | 30.10 | 0.944 0 | 1.7 | 7.00 | 29.43 |
| 9# | 38.22 | 40.01 | 1.005 6 | 1.6 | 4.68 | 38.62 |
| 10# | 32.51 | 34.66 | 0.784 2 | 1.9 | 6.61 | 37.12 |
| 11# | 40.36 | 42.05 | 0.915 4 | 1.7 | 4.19 | 35.31 |
| 12# | 42.66 | 43.97 | 0.739 8 | 1.8 | 3.07 | 36.12 |
), ArticleFig(id=1241451352203776220, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241408878039060944, language=CN, label=表3, caption=
悬臂板冲击载荷时间历程重构结果
, figureFileSmall=null, figureFileBig=null, tableContent=
冲击点序号 Impact point No. | 冲击载荷幅值 Impact load amplitude/N | 最优拟合参数 Optimal fitting parameters | ePRE/% | eRE/% |
|---|
真实值 True value | 重构值 Reconstruction value | μo | σo/10-4 |
|---|
| 1# | 35.12 | 32.45 | 0.813 4 | 1.5 | 7.60 | 39.67 |
| 2# | 21.50 | 22.46 | 0.958 8 | 2.0 | 4.47 | 32.15 |
| 3# | 41.30 | 38.43 | 0.924 6 | 1.6 | 6.95 | 31.54 |
| 4# | 25.87 | 27.14 | 0.864 4 | 1.8 | 4.91 | 28.73 |
| 5# | 47.21 | 48.68 | 0.670 0 | 1.7 | 3.11 | 34.33 |
| 6# | 35.92 | 37.21 | 0.872 0 | 1.8 | 3.59 | 37.18 |
| 7# | 43.67 | 41.52 | 0.876 4 | 1.9 | 4.92 | 31.91 |
| 8# | 28.13 | 30.10 | 0.944 0 | 1.7 | 7.00 | 29.43 |
| 9# | 38.22 | 40.01 | 1.005 6 | 1.6 | 4.68 | 38.62 |
| 10# | 32.51 | 34.66 | 0.784 2 | 1.9 | 6.61 | 37.12 |
| 11# | 40.36 | 42.05 | 0.915 4 | 1.7 | 4.19 | 35.31 |
| 12# | 42.66 | 43.97 | 0.739 8 | 1.8 | 3.07 | 36.12 |
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