颤振边界高效精确预测分析  

The high efficiency and accuracy prediction analysis of the flutter envelope

作　　者：程芳 李俊杰 CHENG Fang;LI Junjie(Department of Strength Engineering Research,AVIC The First Aircraft Institute,Xi’an 710089,China)

机构地区：[1]航空工业第一飞机设计研究院强度设计研究所,西安710089

出　　处：《航空工程进展》2023年第3期100-107,共8页Advances in Aeronautical Science and Engineering

摘　　要：高效精确地确定多种飞机构型的颤振边界在飞机设计过程中具有重要意义。为了提高计算效率和计算结果的准确性,针对亚声速和跨声速两种马赫数区域,提出分别采用线性和非线性方法进行非定常气动力分析。非线性分析在引入精确的定常气动力的基础上,采用高效率跨声速小扰动方程进行求解;颤振求解统一采用g法。对大型飞机的梁架—减缩刚度组合模型的空机及3种典型燃油构型进行涵盖飞行包线的全马赫数变高度颤振分析,结果表明:4种构型的颤振边界与颤振试飞边界一致,与其他分析方法相比,效率明显提高,尤其是对于多种飞机构型能够高效地获得准确的颤振边界,即说明本文采用的颤振边界预测方法是目前适用于工程上的一种高效精确的预测大型飞机颤振边界的方法。It is significant to efficiently and accurately determine the flutter boundary of various aircraft configura-tions in the aircraft design.In this paper,the linear unsteady aerodynamic method and nonlinear unsteady aerody-namic method are adopted for the subsonic and transonic areas,respectively.In the nonlinear method,the transonic small disturbance equation based on the accuracy steady CFD results is used as inputs.The g method is used in all flutter solutions for different Mach areas.The flutter analysis is used for an beam and reduced stiffness FEM model of the whole aircraft including empty aircraft and three special fuel cases for choosing the typical altitudes and Mach number covering the flight envelope and determine the flutter envelopes for the four aircraft configuration.Results show that the flutter boundary of the aircraft is consistent with flight flutter test.Compared with other analysis meth-ods,the efficiency is obviously improved,especially for a variety of aircraft configurations.Therefore,the method adopted in this paper is an efficient and accurate method for predicting flutter boundary of large aircraft,which is suitable for engineering at present.

关 键 词：颤振包线 线性 非线性 跨声速小扰动方程 减缩刚度 

分 类 号：V215.34[航空宇航科学与技术—航空宇航推进理论与工程]