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| A method combining matrix perturbation and Newmark-β stepwise integration for load identification of uncertain structure |
| Received:June 05, 2021 Revised:July 18, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20210605002 |
| KeyWord:matrix perturbation Newmark-β uncertain structure time domain load identification |
| Author | Institution |
| 李晓旺 |
北京机械设备研究所, 北京 |
| 黄科 |
北京机械设备研究所, 北京 |
| 魏广威 |
北京机械设备研究所, 北京 |
| 杨翔飞 |
北京机械设备研究所, 北京 |
| 黄磊 |
北京机械设备研究所, 北京 |
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| Abstract: |
| In order to reconstruct the upper and lower bounds of dynamic excitation applied on the uncertain structure,a method combining matrix perturbation and Newmark-β stepwise integration is establish.Firstly,matrix perturbation theory is used to express dynamic load in a first-order Taylor polynomial expansion.Then Newmark-β stepwise integration algorithm is introduced to decouple differential equation of structural dynamics in time domain.A linear discrete equation combining structural response,structural characteristics and dynamic load is set up.As a result the midpoint and first-order perturbation of dynamic load are calculated.Numerical examples indicate that the proposed method is able to identify force bounds at high speed and accuracy.Meanwhile,this method possesses strong noise resistance. |