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| Dynamic load identification in second-order formulation in time domain based precise time-integration |
| Received:June 27, 2016 Revised:October 31, 2016 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201705015 |
| KeyWord:Lancaster structure decoupled second-order formulation load identification precise time-integration method step load modal analysis |
| Author | Institution |
| 王淑娟 |
哈尔滨工程大学 理学院, 哈尔滨 |
| 韩伟民 |
哈尔滨工程大学 理学院, 哈尔滨 |
| 王国巧 |
哈尔滨工程大学 理学院, 哈尔滨 |
| 沈继红 |
哈尔滨工程大学 理学院, 哈尔滨 |
| 姜楠 |
哈尔滨工程大学 理学院, 哈尔滨 |
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| Abstract: |
| The way of load identification based on modal analysis transforms the system equation into a decoupled form by modal matrix,but this is only applicable to problems with proportional damping.In this paper a load identification method in time domain is established based on the decoupled second-order formulation.Firstly,the decoupled form of system equations is obtained in Lancaster structure by theoretical derivation; then,with the assumption that the load is a step function,the load identification formulas are derived by the precise time-integration method; finally,the time history of a structural load is obtained by systematic real-time response.The numerical experiments verify that the new method not only has a higher accuracy than the modal analysis method for systems with proportional damping,but also is efficient for systems with non-proportional damping. |
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