Aerothermoelastic Reduced-Order Model of a Hypersonic Vehicle

Autor: Carlos E. S. Cesnik, Ryan J. Klock
Rok vydání: 2015
Předmět:
Zdroj: AIAA Atmospheric Flight Mechanics Conference.
DOI: 10.2514/6.2015-2711
Popis: Model reduction techniques are applied to a hypersonic vehicle on terminal trajectories to capture the aerodynamic, thermodynamic, and structural dynamic system evolution and couplings. The General Pseudospectral Optimization Software (GPOPS-II) was used to determine a set of terminal trajectories which maximized impact velocity. Shock, Prandtl-Meyer expansion, and piston theory were combined to create an approximate flow solution over the outer mold line which was then compared to Fully Unstructured Navier-Stokes 3-Dimensional (FUN3D) computational fluid dynamics solutions. Proper orthogonal decomposition of the thermal state of the vehicle was conducted leading to 33 thermal degrees of freedom rather than approximately 28,000 contained by a representative finite element model, while sacrificing negligible system energy. Free vibration mode shapes are derived and used to generalize the structural dynamics equations of motion reducing the number of structural degrees of freedom to 8 from the original 130,000. Finally, the combination of these reduced order models is discussed in the context of future work toward a full vehicle simulation.
Databáze: OpenAIRE