改进的SEREP缩聚法在航天器结构动力学模型修正中的应用  

Application of improved SEREP model reduction in dynamic model updating for spacecraft structural analysis

作　　者：李建宏宇 庞贺伟[3] LI Jianhongyu;PANG Hewei(Beijing Institute of Spacecraft Environment Engineering;National Key Laboratory of Science and Technology on Reliability and Environmental Engineering;China Academy of Space Technology,Beijing 100094,China)

机构地区：[1]北京卫星环境工程研究所 [2]可靠性与环境工程技术重点实验室 [3]中国空间技术研究院,北京100094

出　　处：《航天器环境工程》2021年第1期17-24,共8页Spacecraft Environment Engineering

摘　　要：模型缩聚是基于频率响应的模型修正的基础,准确的模型缩聚才能保证模型修正的正确性。针对目前的模型缩聚方法对于航天器结构在中高频段不能准确反映模型动力学特性的问题,提出改进的SEREP缩聚方法:以结构的模态分析为基础,通过加入扩展的主自由度增加缩聚模型对应的线性子空间的维数。经实际航天器结构算例证明,在使用改进的SEREP缩聚方法后,缩聚模型的特征值和频率响应的精度得到提高,可以准确反映结构的动力学特性。The model reduction is the precondition for the model updating based on the frequency responses.It is only with an accurate model reduction method,that the proper model updating can be ensured.With the view to accurately reflect the dynamic characteristics of the model for the spacecraft structure in the medium-to-high frequency band,an improved SEREP model reduction method is proposed in this paper,based on the modal analysis of the structure,and the increase of the dimension of the linear subspace corresponding to the model reduction by adding extended master degrees of freedom.It is shown by a spacecraft structure example that the precisions of the eigenvalues and the frequency responses are increased with the improved SEREP model reduction,thus the reduced model can accurately reflect the dynamic characteristics of the structure.

关 键 词：航天器结构 频率响应 模型缩聚 SEREP缩聚方法 模型修正 

分 类 号：V414.1[航空宇航科学与技术—航空宇航推进理论与工程]