Gust response analysis using CFD-based reduced order models

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