在介绍子模型法基本思想和基本分析步骤的基础上 ,针对发动机结构强度分析的特点 ,对某新型发动机复杂结构进行组合总体分析 ,采用子模型法对发动机某些关键的局部结构进行细化分析 ,并采用外推法对分析结果的误差进行估计 .通过实例分析表明 ,采用子模型法不仅可以解决复杂结构分析时软硬件条件的制约 ,而且可以得到精度较高的分析结果 ,这种方法可以广泛地应用于复杂结构的强度分析中 . Based on the introduction of the basic idea of ​​sub-model method and the basic analysis steps, aiming at the characteristics of engine structural strength analysis, the complex structure of a new engine is analyzed and the sub-model is used to analyze some of the key local structures of the engine , And the extrapolation method is used to estimate the error of the analysis results.An example analysis shows that the sub-model method can not only solve the constraints of hardware and software conditions in complex structure analysis, but also can obtain the analysis results with high accuracy, which can Widely used in the analysis of complex structures.