超高速摄影中三面体铝合金转镜的空间结构强度数值分析

 给出了3维弹性力学空间问题基本方程和有限元结构强度分析原理，分析了三面体铝合金转镜空间结构强度的力学特征，建立了有限元模型，分析了其在轴孔与轴的3种配合关系下的应力分布。结果表明轴孔严重削弱了镜体强度，而配合方式对转镜强度基本无影响。提出了减小转镜内部应力的无轴孔三面体铝合金转镜结构，在该结构下转镜强度提高了1.9倍，极限转速为原结构的1.7倍，适合于分幅式摄影系统。

Numeric analysis of structural strength of aluminous alloy rotating mirror for ultra-high speed photography

The 3D elastic mechanics and finite-element structure analysis priniple were provided.The mechanics characteristics of the three-faced aluminous rotating mirror were analyzed,and the finite-element model was established.The stress distributions of the tri-face aluminous mirror were presented under three fits of the shaft and axle hole.The simulation results indicate that the fit modes affect the mirror structual strength little,but the axle hole weakens the structual strength obviously.The improved structure which diminishes the inner stress of the rotating mirror was presented,whose structual strength is 2.9 times and the utmost linear rate is 1.7 times of the old one,so it is more propitious to the frame-camera.