In the mechanical design industry, it is very time-consuming to convert actual engineering design problems into finite element models, and it is repeatedly modified during the product design process. Each time the structure is modified, computer simulation analysis is repeated, and the product development cycle becomes longer. Therefore, in this paper, a re-analysis theoretical method based on the inversion of the block matrix based on the change threshold is proposed to quickly obtain responses with different accuracy after the structure is modified according to the initial analysis. By modifying the size of the change threshold, the accuracy and calculation time of the reanalysis results are controlled. This reanalysis method shortens a lot of calculation time under the premise of controllable response accuracy. In this paper, numerical calculations are given to show the accuracy of the response under different thresholds, and the efficiency of this method is proved by the finite element model under the same accuracy.

在机械设计行业中，将实际的工程设计问题转换为有限元模型非常耗时，并且在产品设计过程中会对其进行反复修改。每次修改结构时，都会重复计算机仿真分析，并且产品开发周期会更长。因此，本文提出了一种基于变化阈值的基于块矩阵求逆的重新分析理论方法，以根据初始分析对结构进行修改后快速获得不同精度的响应。通过修改更改阈值的大小，可以控制重新分析结果的准确性和计算时间。这种重新分析方法在响应精度可控的前提下缩短了很多计算时间。在本文中，