Research On Thermal Vibration And Aerothermoelastic Under High Temperature Of Structure

The concept of aeroelastic has been proposed since 1930 s. The aircraft ’s aeroelastic problem has became a hot topic in the worldwide engineering and scientific fields. With the increase of the aircraft flight speed, aerodynamic heating increases significantly, the dynamics characteristics and aeroelastic problems of structures under high temperature become a focus for researchers.Firstly, the vibration experiments of titanium alloy’s structures were implemented to get the influences of material property and thermal stress on the vibration characteristics of structures under high temperature environment, and finite simulation software MSC.PATRAN/NASTRAN was used to establish finite element models and do simulation analyses, the finite element simulations were corrected according to the actual tests results. And a typical hypersonic aircraft thermal protection TPS composite plate with boundary conditions of bilateral clamped and lateral thermal field were used to verify the step and boundary conditions in the upon simple structure simulation.Next, the thermal vibration test and finite element simulation of a rudder surface structure clamped in the shaft ends were carried out. Then flutter performance of the rudder surface structure at room temperature were analyzed by the aeroelastic analysis part of NASTRAN(sol 145), the material property, flight altitude and flight speed on critical flutter boundary of structure are the main considerations in this part. Finally, through the results of rudder surface structure’s thermal vibration analyses, the thermal aeroelastic study results of two different boundary conditions under three different temperature fields were obtained. The critical flutter speed of structure and the changes of torsional bending difference has a linear relationship.