基于ROM技术的阵风响应分析方法

阵风响应分析是大型飞机设计过程中必不可少的环节. 现有的阵风响应分析主要采用基于线化升力面理论的气动力模型，不能考虑到各种非线性效应，不适合于跨音速气动弹性的分析. 基于CFD技术，采用系统辨识方法，在状态空间内建立了降阶的非定常气动力模型(reduced order model, ROM). 耦合结构运动方程、非定常气动力模型(结构运动)、外激阵风的气动力模型，建立了基于CFD技术的阵风响应分析模型.算例研究了某一典型机翼在方波激励下的阵风响应问题，对比了各阶模态位移的响应以及翼根弯矩的响应. 基于ROM技术的计算结果与CFD/CSD直接耦合仿真结果吻合，证明了该方法的正确性和精度. 

GUST RESPONSE ANALYSIS USING CFD-BASED REDUCED ORDER MODELS

Gust response analysis plays an important role in largeaircraft design. Most of existing aerodynamic models for gust responseanalysis are linear, not suitable for transonic nonlinear aeroelasticanalysis. In this paper, based on CFD technique and system identificationmethod, a CFD-based ROM (reduced order model) is firstly constructed instate space. Gust response analysis is then investigated by couplingstructural equations with CFD-based ROM. The case of a square-edged gustresponse for a typical wing is presented to obtain the responses ofgeneralized coordinates and root bending moment (RBM) and to validate thecorrectness and precision of the CFD-based ROM method, compared well withthe direct approach of a coupled CFD/CSD methodology