薄壁圆柱壳的动态优化设计方法

Dynamic Optimization Design Method of Thin-Walled Cylindrical Shell

为了降低薄壁圆柱壳模态共振条件下的振动幅值与振动应力水平以及提高抗高周疲劳能力,研究薄壁圆柱壳的不同厚度和材料参数对其振动应力的影响,并采用有限元法计算薄壁圆柱壳关键位置节点处的动应力和振动响应.研究结果表明,薄壁圆柱壳存在最优的厚度值,其厚度增加到一定程度可以有效地降低薄壁圆柱壳的动应力.然而,改变薄壁圆柱壳的材料参数对其振动应力的影响较小.

The influence of different thickness and material parameters on the dynamic stress of thin- walled cylindrical shell is studied so that to reduce the vibration amplitude and dynamic stress of thin- walled cylindrical shell under the condition of modal resonance, and improve the ability of anti-high cycle fatigue. The dynamic stress and vibration amplitude of the key position of thin-walled cylindrical shell are calculated by the finite element method. The results show that the thickness of thin cylindrical shell has the optimal value, and the dynamic stress can be reduced effectively by increasing the thickness of thin-walled cylindrical shell to a certain extent. The shells have little effect on the vibration stress. material parameters of the thin-walled cylindrical