Thermal Modal Analysis of Wing Considering Aerodynamic Heating

The vehicles will suffer strong aerodynamic heating at high speed, which will generate high temperature and large temperature gradients on the structure of the vehicles. There are two problems will be introduced in modal analysis in the thermal environment caused by aerodynamic heating, which will change the stiffness and stiffness distribution of the structure. The main work of this paper is given as follows. Firstly, a new method, which makes the aero thermodynamics and heat transfer coupled, is used to calculate the temperature distributions at every time in the process of aerodynamic heating. Secondly, the finite element method is employed to compute the modal frequencies and shapes at every condition of temperature distribution. Finally, the changes of the temperature distributions and the modal frequencies and shapes with every time in the process of aerodynamic heating are obtained. Based on the analysis and investigation of the simulation results, the influence of the transient thermal environment on structure modal frequency and shape is determined. Furthermore, the investigation of wing structure modal analysis considering aerodynamic heating is an important basis of aerothermoelastic simulation.