水下高速运动体的抗弯稳定可靠性分析

Analyzing of buckling resistance of an underwater elastic body experiencing high speed motion

为了分析水下高速运动弹性体的抗弯稳定可靠性问题,建立了一个简化的力学模型.基于小挠度下杆所承受载荷的微分方程,确定了水下高速运动弹性体的弯曲失稳临界载荷,在此基础上进行了结构的可靠性分析,得到了结构的可靠性指标和失效概率.通过算例表明,结构的失效概率对圆锥杆的后端与前端圆盘直径比的依赖性很大.该分析具有一定的工程应用意义.

To investigate the resistance to buckling of an underwater elastic body experiencing high speed motion, a simplified mechanical model was developed. Based on the differential equations of a loaded bar with small deflec- tions, the critical load on an elastic body in high speed motion in water was determined. Afterward structural relia- bility analysis was carried out, and the reliability index and its failure probability were obtained. Our test showed that the failure probability of this kind of structures greatly depend on the ratio of diameter of end disk to that of front disk connected on the conical bar.