舵面热颤振分析研究

Analysis on Thermal Flutter of Rudder with Aerodynamic Heating

建立小展弦比空气舵结构有限元模型,研究了典型温度分布下舵面结构模态特性,在此基础上得到不同温度分布下单独舵面结构热颤振特性。研究结果表明,温度上升,舵面刚度下降,结构频率降低,舵面的发散速度下降;温差增大,热应力影响增强使得热刚度提高,舵面的发散速度上升。

The finite element model of air rudder structure is established and the structural modal characteristic in typical temperature field is studied. Based on the analysis results, thermal flutter charac- teristic of the separate rudder is studied in different temperature distributions. Research shows that elevat- ed temperature reduces the rudder stiffness distribution, the decreasing the structural frequency and final- ly control surface divergence speed falls. As the temperature difference increases, effect of thermal stress should be enhanced, so the thermal stiffness and rudder surface divergence speed rises.