北京航空航天大学学报 ›› 2011, Vol. 37 ›› Issue (6): 665-668,679.

• 论文 • 上一篇    下一篇

基于有限元Craig缩聚模型的基础激励和载荷识别

朱斯岩1, 朱礼文2   

  1. 1. 北京航空航天大学 航空科学与工程学院, 北京 100191;
    2. 北京宇航系统工程研究所, 北京 100076
  • 收稿日期:2010-03-10 出版日期:2011-06-30 发布日期:2011-07-05
  • 作者简介:朱斯岩(1973-),女,北京人,讲师,ysz4444@buaa.edu.cn.

Base excitation and load identification based on Craig reduction model

Zhu Siyan1, Zhu Liwen2   

  1. 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
  • Received:2010-03-10 Online:2011-06-30 Published:2011-07-05

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.

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 of interface DOF and the calculated dynamic response of non-interface DOF. The only error of this method for base excitation and load identification is the difference between the Craig reduction model and the original finite-element model. For this reason, frequency response analysis was applied to determine the precision of Craig reduction model through the variation of the frequency response curve. An example was given to demonstrate the validity of the present base excitation and load identification method.

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