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| Study of dynamic force identification for free-free structural system |
| Received:September 27, 2008 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20101006 |
| KeyWord:force identification ill-posed problem inverse problem singular valued decomposition regularization technique |
| Author | Institution |
| 毛玉明 |
大连理工大学 工业装备结构分析国家重点实验室,大连 |
| 郭杏林 |
大连理工大学 工业装备结构分析国家重点实验室,大连 |
| 赵岩 |
大连理工大学 工业装备结构分析国家重点实验室,大连 |
| 朱礼文 |
北京宇航系统工程研究所,北京 |
| 潘忠文 |
北京宇航系统工程研究所,北京 |
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| Abstract: |
| A discrete formulation of force identification method in time domain is proposed, which is mainly for reconstructing the dynamics force applied on free-free structural system. The inverse problem of force identification is always ill-posed due to the inverse process of structural matrix and measurement noise in practical engineering and the ordinary least square method always obtains the meaningless solution. This paper further discloses the essence of ill-posedness of force identification problem in detail through the singular valued decomposition technique, and the corresponding regularization technique is presented to single out a stable and useful solution to force identification problem. Finally two forces exerting on a free-free plane frame structure are successfully identified by regularization technique with different measurement noise, at the same time the force identification results obtained by regularization technique are compared with the results gained by ordinary least square method. The numerical simulation shows that the regularized solution to identification of load exerting on the free-free structural system is valid. The proposed method is meaningful in the application to dynamic force identification for flying vehicles. |