摘要
在水下高速运动的超空泡运动体,其所受轴向力非常大,容易发生结构屈曲问题。考虑到结构自身参数的不确定性,有必要对运动体结构进行屈曲可靠性分析。首先给出超空泡运动体圆柱薄壳舱段的受力模型,并运用半解析有限元法得到临界屈曲载荷。然后建立圆柱薄壳舱段屈曲安全余量函数,给出了临界屈曲载荷隐函数形式的敏度表达式,再用有限步长迭代法求屈曲可靠性指标。最后,通过算例分析了不同空化器锥角时的圆柱薄壳舱段屈曲可靠性指标随速度的变化趋势。
Supercavitating vehicles with high underwater velocity undergo high longitudinal force.The axial pressure can cause structure buckling problem of Supercavitating vehicles.Moreover,the indefiniteness of structural own parameters should be considered.Therefore,it is necessary to perform structure buckling reliability analysis of supercavitating vehicles.Firstly,structure force model of cylindrical thin shell compartment of supercavitating vehicles is established.And critical buckling load is obtained by semi-analytical FEM.Secondly,buckling safety margin function of cylindrical thin shell compartment is established.Sensitivity expression of critical buckling load is presented.And then structure buckling reliability index is obtained by limit step length iteration method.Finally,through numerical results,it is studied that change tendency of structure buckling reliability index of cylindrical thin shell compartment along with the variety of velocity under different cone-cavitator angles.
出处
《船舶力学》
EI
北大核心
2011年第7期769-775,共7页
Journal of Ship Mechanics
基金
国防"十一五"基础科研项目(A2420061291)
关键词
超空泡运动体
圆柱薄壳舱段
半解析有限元
有限步长迭代法
屈曲可靠性分析
supercavitating vehicles
cylindrical thin shell compartment
semi-analytical FEM
limit step length iteration method
buckling reliability analysis
