热效应对空天飞行器翼面振动特性的影响

Influence of Thermal Effect on Wing Vibration Characteristics of Aerospace Vehicle

机体振动是空天飞行器研究的重点之一。本文对空天飞行器机翼结构的振动特性进行了数值仿真,获得了不同温度及温度梯度条件下空天飞行器机翼结构的特征值和固有频率。温度产生的热应力对结构刚度贡献不能忽略,因为热应力的表现形式包含拉应力和压应力,拉应力增加了结构的刚度,压应力减小了结构的刚度。该结果对热载荷下的翼面设计具有指导意义。

The vibration of the body is one of the key points in the research of aerospace vehicle.In this paper,the numerical simulation of the vibration characteristics of wing structure is carried out,and the eigenvalue and natural frequency of wing structure under different temperatures and temperature gradients are obtained. The contribution of thermal stress to structural stiffness cannot be ignored because the expression of thermal stress includes tensile stress and compressive stress. Tensile stress increases the stiffness of structure,and the compressive stress reduces the stiffness of the structure. The results are of guiding significance for the design of wing surface under thermal load.