【摘要】 飞机上很多结构处于热和振动的复合环境中,在结构优化设计时应该综合考虑两者的影响。热环境对结构动力学特性的影响体现在结构刚度矩阵的改变,从而导致结构的固有频率改变。基于对热环境下结构动力学特性的分析建立热环境下结构动力特性优化模型,针对均匀温度场和热传导两种热环境下的结构,并考虑制造工艺,对结构进行动力学特性优化。优化结果表明:考虑热环境的结构动力学特性优化提高了结构的固有频率,使结构的固有频率远离外界激励的频率范围,避免由于热使结构固有频率改变而导致共振现象。更多还原

【Abstract】 Many aircraft structures are in thermal and vibration composite environment,and the two both should be taken into account in structural optimization design. Thermal environment influences the structural dynamic characteristics on the change of structural stiffness matrix,and then changes of the structure natural frequency. Basing on the analysis of structural dynamics in thermal environment optimization model was built both for uniform temperature field and thermal conduction structure Considering the manufacture process, the model optimizes the dynamic characteristics of structure. Results suggest that optimization considering the thermal environment of structural dynamics characteristics can improve the structure natural frequency and then keep the natural frequency away from the range of external excitation frequency to avoid resonance phenomenon caused by the change of the structural natural frequency resulting in thermal environment.更多还原