摘要
用改进的正交模型正交模态(ICMCM)法,结合模型缩聚及模态扩展技术对某贮箱结构进行了有限元模型修正。分析结果表明:用ICMCM法进行修正时模态扩展方法的可修正参数数量远大于模型缩聚法。对修正参数较多的修正问题,用模态扩展方法因在修正过程中可使用的数据量增加使修正方程数同时增加,可获得更好的修正结果。
The finite element model of some tank was modified by improved cross-model cross-modal method with the model reduction method and modal expansion technique respectively in this paper. The modified results showed that the updating parameters using modal expansion technique were much larger than that using model reduction method. The modal expansion technique was more suitable for model updating method because the incensement of data made the updating parameters were huge.
出处
《上海航天》
2014年第5期60-64,共5页
Aerospace Shanghai
关键词
有限元模型修正
自由匹配度
模型缩聚
模态扩展
Finite element model updating method
Freedom matching
Model reduction
Modal expansion
