潜艇方向舵舵轴的应力分析

针对某潜艇舵传动装置仿真试验样机，利用简支梁、三弯矩方程和有限元方法对舵轴系统进行了建模、计算及数值分析，为使潜艇舵轴各部件尺寸更趋合理提供设计依据。     

Interaction of two-dimensional impulsively started airfoils

Continuous vortieity panels were used to model general unsteady inviscid, incompressible, two-dimensional flows. The geometry of the airfoil was approximated by series of short straight segments having endpoints that lie on the actual surface. A piecewise linear, continuous distribution of vorticity over the airfoil surface was used to generate disturbance flow. The no-penetration condition was imposed at the midpoint of each segment and at discrete times. The wake was simulated by a system of point vortices, which moved at local fluid velocity. At each time step, a new wake panel with uniform vortieity distribution was attached to the trailing edge, and the condition of constant circulation around the airfoil and wake was imposed. A new expression for Kutta condition was developed to study the interference effect between two impulsively started NACA0012 airfoils. The tandem arrangement was found to he the most effective to enhance the lift of the rear airfoil. The interference effect between tidal turbine blades was shown clearly.     

潜艇方向舵对艉升降舵舵卡的挽回操纵仿真分析

为分析潜艇方向舵对艉升降舵卡下潜大舵角的影响,建立潜艇水下空间运动及舵卡均衡模型,仿真分析表明,潜艇艉舵卡下潜舵大舵角后,立即减速并使用"方向舵满舵+艏上浮舵满舵"的抗沉措施在中低航速时是一种有效的挽回艉舵卡下潜满舵的手段。