自由弹性机翼跨音速阵风响应分析

Gust response analysis of free elastic wing in the transonic flight regime

基于卷积模型发展了一种快速计算自由弹性机翼阵风响应的方法,并把这方法运用于跨音速阵风响应分析。此方法只需要用计算流体力学(CFD)方法计算一次弹性机翼在锐边阵风下的升力和广义坐标响应,任意形式的阵风响应可以迅速通过模型计算得到,计算效率和CFD方法相比得到了很大的提高。按照运输类飞机适航标准建立喷气运输机机翼在0.85马赫数时的模型,通过模型计算不同阵风形式下的响应,和直接CFD模拟的结果符合得很好,运用这种方法能快速计算各种阵风下的临界载荷响应包线。

This research presents a methodology for introducing CFD to gust response analysis in a computationally efficient manner.The approach involves computing sharp-edge gust responses of both generalized aerodynamic forces and gust generalized aerodynamic forces in a CFD run,computing the gust response due to arbitrary gust profiles via convolution.The method is highly computationally efficient,as only one relatively short CFD run is required for the computation of the sharp-edge gust responses,after which responses to arbitrary gust profiles can be computed in seconds.The use of the method is demonstrated on a transport wing that passes through one-minus-cosine gust as required by the CCAR at mach number0.85,which yields accurate response compared to the CFD results.The response envelope of critical load in different conditions can be calculated very fast.