热效应对导弹翼面固有振动特性的影响

Thermal Effect on Dynamic Characteristics of a Missile Wing

以变厚度导弹翼面模型为研究对象,通过有限元仿真,分析了加热状态下翼面模型的瞬态温度场和振动特性的变化过程,并与试验结果做了比较。研究表明,热效应引起材料弹性模量等参数的变化以及结构热应力,两者综合影响下,结构前3阶固有频率降低了。有限元仿真发现,材料弹性模量等参数的变化比热应力对固有频率的影响更大。实测试件温度上升190°C时,结构前3阶固有频率最高可下降1.3%。

Dynamic characteristics of a missile wing can changes largely because of the thermal effect during a hypersonic flight.A thickness variable wing model is analyzed by the finite element method（FEM） to obtain its dynamic characteristic and temperature field changes under heating.The result of FEM are compared with that of the experiment,which shows that the natural vibration frequencies will decrease with the material elastic modulus changes and the thermal stresses generation along with the aerodynamic heating.The change of material elastic modulus affects the natural frequencies much more than the thermal stress does.In the experiment,when the temperature of the wing＇s surface increases by 190 degrees Celsius,the first three natural frequencies have a maximum decrease of 1.3 percent.