热应力对机翼结构固有频率的影响分析
Influence of Thermal Stress on Vibration Frequencies of a Wing Structure

研究了热应力对飞行器机翼结构固有频率的影响。用ANSYS建立机翼结构有限元模型，计算了均匀温度场、非均匀温度场和非均匀可变温度场条件下的结构热应力分布和振动模态。根据固有振动的结构变形,分析了热应力对固有频率的影响效应。研究结果表明，热环境下机翼结构因材料属性的退化导致固有频率下降，但对于振型节线处于翼面内部的振动模态，附加热应力刚度矩阵在结构总刚度矩阵变化中起主导作用，使该阶固有频率增大。
To analyze the influence of thermal stress on vibration frequencies, a wing structure finite element model is established using ANSYS. The structural thermal stress distribution and vibration modes are calculated with uniform, non-uniform and non-uniform variable temperature fields. According to the structure deformation of natural vibration, the influence of thermal stresses on natural frequencies is analyzed. The results show that the natural frequencies of the wing structure will decline because of material deterioration in the thermal environment. For some vibration modes whose nodal lines are in the wing surface, the additional heating stress stiffness matrix will take a leading role in the total stiffness matrix, and those natural frequencies will be increased.