基于面外刚度修正的全尺寸飞机动特性精确高效计算

全尺寸飞机结构的动特性计算时，经常遇到网格数量多、计算成本高、内存占比大以及计算效率慢等问题。为了抑制冗余局部模态，将其排除到所关心的频率范围之外，提出增加壳单元面外刚度的方法，进行局部模态缩减，仅显现主要整体模态；并分别利用典型盒段模型和全尺寸飞机模型对整体模态的计算精度和效率进行验证。结果表明：面外刚度修正方法可以用于全机结构动特性的准确高效计算，全机模型的计算效率提高了100多倍，存储文件空间减小了近10倍，前六阶整机模态频率的最大误差为4%左右。

Accurate and efficient calculation method for full-scale aircraft dynamic characteristics based on out-of-plane stiffness correction

Some problems such as large number of grids, high calculation cost, large proportion of memory and slow calculation efficiency may be encountered when calculating the dynamic characteristics of full-scale aircraft structures.In order to exclude the redundant local mode from the frequency range of interest and emphasize the main overall mode,the method of increasing the out-of-plane stiffness of the shell element is proposed. The accuracy and efficiency of the method are verified by using a box model and a full-scale aircraft model.The simulation results show that, the calculation efficiency of full-scale aircraft structure is increased by more than 100 times. As a result, the file storage space is reduced by nearly 10 times. The maximum error of the first 6-order modal frequency of full-scale aircraft is only around 4%.