Preliminary Research on the Aerothermoelastic Behaviours of Sweptback Wing
Natural modes and flutter of the sweptback wing are analyzed at different temperatures. Natural frequencies are reduced as temperature increasing, the temperature gradient in the structure tend to reduce model stiffness due to changing in material properties and development of thermal stress, which degrade the structure stability. Results in this paper show that the 1st~4th order natural frequencies of sweptback wing in this paper decrease by about 12.09%, 15.06%, 14.31% and 12.57%respectively from room temperature to 450°C.The flutter frequency and velocity are also reduced as the decreasing of natural frequency due to the elevating of temperature by aero-heating; and the flutter frequency and velocity decrease by about 12.42% and 16.69% respectively as the temperature elevating from normal up to 450°C at Ma=3.0.
W. Zhao et al., "Preliminary Research on the Aerothermoelastic Behaviours of Sweptback Wing", Applied Mechanics and Materials, Vols. 138-139, pp. 874-878, 2012