民机翼型跨音速风洞颤振模型的模态分析  

Modal Analysis of the Flutter Model of a Civil Airfoil in the Transonic Wind Tunnel

作　　者：陈千一[1] 孙亚军[1] 张婷婷 张苏华 窦忠谦[1] CHEN Qianyi;SUN Yajun;ZHANG Tingting;ZHANG Suhua;DOU Zhongqian(Shanghai Aircraft Design and Research Institute,Commercial Aircraft Corporation of China,201210 Shanghai,China)

机构地区：[1]中国商飞上海飞机设计研究院,上海201210

出　　处：《力学季刊》2018年第4期854-858,共5页Chinese Quarterly of Mechanics

摘　　要：民用飞机在跨音速区的颤振特性是其设计的关键限制之一,与飞机的安全性息息相关.跨音速颤振的计算会遇到激波、流动分离等高度非线性的气动问题,因此在计算跨音速颤振问题时往往把注意力放在气动力的计算精度上.但是,如果模态分析的计算精度不够,同样无法获得可靠的颤振计算结果.本文采用HyperMesh软件进行有限元建模,主要结构件均保留了原始结构的几何信息,通过设置材料密度模拟结构的质量分布.由NASTRAN软件的Lanczos求解器完成模态分析并给出主要关注的四阶模态,经过简单的有限元模型修正,使四阶模态的计算频率与试验频率一致,计算和试验的固有振型一致,为后续的跨音速颤振分析打下基础.The flutter characteristic of a civil aircraft in the transonic regime is closely related to the safety of the aircraft,and is one of the key problems in designing.Highly nonlinear aerodynamic problems such as shock and flow separation are encountered when transonic flutter is simulated.As a result,emphasis is laid on the accuracy of numerical simulation of aerodynamics.However, if the modal analysis precision is not high enough,the simulation result of flutter is not reliable.In the present paper,the finite element model is built by HyperMesh.The geometries of the main structure components are reserved,and the mass distributions of the structures are modeled by setting density.The modal analysis is carried out by the Lanczos solver of NASTRAN,and the four main modes which have influence on flutter are obtained.After simple model updating,the numerical results of the four modes are in agreement with the test data.The natural modal shapes of the four modes also agree with the test data.This work laid a foundation for the subsequent transonic flutter analysis.

关 键 词：复杂结构 模态分析 固有频率 固有振型 有限元模型修正 

分 类 号：V216.24[航空宇航科学与技术—航空宇航推进理论与工程]