摘要
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。
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 modal from the frequency range of interest,the method of increasing the out-of-plane stiffness of the shell element is proposed,and the local modal is reduced for showing the entire modal.The accuracy and efficiency of the entire modal are verified by using a box model and a full-scale aircraft model.The results show that the out-of-plane stiffness correction method can be applied to the accurate and efficient calculation of the full-scale aircraft structure characteristics,the calculation efficiency of full-scale aircraft model is increased by more than 100 times,the file storage space is reduced by nearly 10 times,and the maximum error of the first 6-order modal frequency of full-scale aircraft is only around 4%.
作者
李鹏
王雅荟
LI Peng;WANG Yahui(Vibration Research Department,Aircraft Strength Research Institute of China,Xi’an 710065,China;School of Mechanical Engineering,Dalian University of Technology,Dalian 116081,China;The 18th Research Department,AVIC Aeronautics Computing Technology Research Institute,Xi’an 710076,China)
出处
《航空工程进展》
CSCD
2022年第2期51-56,共6页
Advances in Aeronautical Science and Engineering
基金
国家自然科学基金(52075068)。
关键词
全机结构
动特性
模态计算
快速高效
面外刚度
full-scale aircraft structure
dynamic characteristics
modal calculation
accurate and efficient
out-ofplane stiffness
