结构振动有限元模型的精细修改方法

FINITE ELEMENT MODEL REFINEMENT OF STRUCTURE VIBRATION

本文在分析模型精细校正的基础上,从另一角度推导了分析模型的质量阵和刚度阵的修改公式,简化了精细校正计算公式,不仅计算量小,且修改灵活,修改后的模型保持了与实际结构的对应关系,从而可以再修改.文中对非测试自由度振型值的计算也给出了改进的公式.最后,简要地讨论了精细校正方法的数学基础.

Based on the fine correction of the analysis model,a group of formulations to update the mass matrix and steffness matrix of the analysis model from another point of view was developed in this paper.The formulations which simplify the process of fine correotion are of a small amount of calculation and easy to update.The updated model meintains a corresponding relationship with the real struoture,thus reupdating can be carried on.This paper also provides a group of improved formulations to calculate the vibrate-type value of untested degree of freedom and discusses the mathematical basis of the fine correction method rather thoroughly.