A Study of Reduced Order Structural Model for Hypersonic Vehicle Control Surface

초록

This work focuses on the development of a way to generate a reduced order model for structural dynamics. In hypersonic regime, it experiences high temperature condition due to aerodynamic heating. And increasing temperature causes thermal stress in the vehicle and material degradation. Reversely, the resulting deformation alters the aerodynamic force and heating condition. Therefore, an efficient methodology is required to capture the complicated behaviors of hypersonic vehicle. In this work, Eckert reference temperature method is used to consider the effect of aero-heating. Further, unsteady aerodynamic force due to structural deformation is considered by using piston theory, since it gives reliable solution in hypersonic regime compared to CFD. Although proposed methodology is able to capture an external force acting on hypersonic vehicle, it is necessary that reduced order mass and stiffness matrix have to be correctly formulated to get a high fidelity solution and to reduce computational time. The specific challenge of handling those are considered by using normal and Ritz mode which capture the quasi-static response due to slowly changing loads. As a finial example, the behaviors of hypersonic vehicle control surface obtained from the constructed reduced order model are compared with full finite element model.