| 基于有限元Craig缩聚模型的基础激励和载荷识别 |
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| 引用本文： | 朱斯岩,朱礼文.基于有限元Craig缩聚模型的基础激励和载荷识别[J].北京航空航天大学学报,2011,37(6):665-668,679. |
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| 作者姓名： | 朱斯岩 朱礼文 |
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| 作者单位： | 北京航空航天大学 航空科学与工程学院,北京,100191;北京宇航系统工程研究所,北京,100076 |
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| 摘 要： | 载荷识别是用有限自由度的加速度测量值推断外力.基础激励是在基础自由度上加给定的加速度时间历程激振结构,求整个结构的动响应.利用Craig减缩模型的性质,及界面自由度的已知运动可求出整个结构其余自由度的动力学响应,完成基础激励求解.在此基础上用已知的界面自由运动和求得的非界面自由度的动力学响应,代入结构动力学方程即可实现载荷识别.本方法唯一能给基础激励和载荷识别结果带来的偏差是Craig缩聚模型与原始有限元模型间的差异,对此用频响分析的方式,直接从频响曲线的变化来确定缩聚模型的精度.算例表明这一新的基础激励和载荷识别途径是有效的.
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| 关 键 词： | 结构动力学 基础激励 载荷识别 |
| 收稿时间： | 2010-03-10 |
Base excitation and load identification based on Craig reduction model |
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| Zhu Siyan,Zhu Liwen.Base excitation and load identification based on Craig reduction model[J].Journal of Beijing University of Aeronautics and Astronautics,2011,37(6):665-668,679. |
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| Authors: | Zhu Siyan Zhu Liwen |
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| Institution: | 1. School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
2. Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China |
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| Abstract: | Load identification use measured acceleration of few degree of freedom(DOF) to determine external applied load.Base excitation give movement upon foundation freedom to excite the structure,and then obtain the whole dynamic response.Making use of characteristics of Craig reduction model,and the known motion of interface DOF,the dynamic response of all other DOF could be calculated,thus the base excitation was achieved.The load identification could be performed through the dynamic equation with these motion o... |
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| Keywords: | structural dynamics base excitation load identification |
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