Abstract
Aerodynamic heating will be caused when a hypersonic vehicle is in flight, so it should be taken into account when a structural dynamic analysis is carried out. A method for structural dynamic analysis under thermal environment is presented in this paper. Firstly, Computational Fluid Dynamic (CFD) method which is based on solving the three-dimensional compressible Navier-Stokes (N-S) equations is employed to perform aerodynamic heating analysis. Secondly, Finite Element Method (FEM) is used to assess structural heat conduction and get temperature field. Lastly, based on the quasi-linear structural model, a structural dynamic analysis is analyzed under thermal environment. A hypersonic composite wing is investigated as a numerical example. Compared with the case without considering aerodynamic heating, major modes and frequencies of the wing change a lot because of the decrease of the elastic modulus and the alteration of structural stiffness distribution. The results indicate that the aerodynamic heating has a high influence on the vibration characteristics. Therefore, aerodynamic heating should be considered in hypersonic structural dynamic analysis.
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