基于面外刚度修正的全尺寸飞机模态特性计算方法  

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

作　　者：李鹏[1] Li Peng(Aircraft Strength Research Institute of China,Xi'an 710065,China)

机构地区：[1]中国飞机强度研究所二室,西安710065

出　　处：《飞行器强度研究》2021年第3期13-19,共7页Aircraft Strength Research

摘　　要：针对全尺寸飞机结构有限元模型计算成本高、内存占比大、计算效率慢等问题,提出采用增加壳单元面外刚度的方法,提高壳单元的弯曲或鼓包刚度,从而将冗余局部模态排除到所关心的频率范围之外,显现主要整体模态,大幅提高计算效率。计算结果表明,此方法可以用于全机结构模态特性的准确高效计算,全机模型的计算时间从56.7h降为0.5h,计算效率提高100多倍;结果文件大小从20.9G降为2.11G,所需存储空间减.小近10倍;前六阶整机模态频率的最大误差仅为4%左右。Due to huge number of DOF(degrees of freedom),the full-scale aircraft structure finite element simulation can cost high calculation time and a large amount of computer memory.In order to obtain’the modal characteristics quickly and efficiently,increasing the out-of-plane stiffness of the shell element can be used to increase the local modal frequency,so as to exclude the redundant local mode from the frequency range of interest.The simulation results show that,this method can increase the calculation efficiency of full-scale aircraft structure 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 for full-scale aircraft is only about 4%.

关 键 词：全机结构 模态计算 快速高效 面外刚度 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]