Aerodynamic&Ballistic Characteristics Research On Trajectory Correction Projectile Based On Micro Spoiler

In modern wars,the demand for the accuracy of weapons is increasing.However,the accuracy of current stock projectile is poor and the cost of the research of missile weapons are too high to be widely applied.Thus,because of its lower technical complexity and higher benefit-cost ratio,trajectory correction technique which based on guided modification of current stock projectile attracts researchers' attention.By adding actuators to the projectile,the aerodynamic configuration of the trajectory correction projectile is changed,which leads to the change of aerodynamic forces and moments.And at last,the accuracy of shooting is improved by changing impact point of the projectile.Micro spoiler as a new type of two-dimension trajectory correction projectile actuator is outstanding because its simple structure,small size,low cost and good aerodynamic effect.Aerodynamic&ballistic characteristics research on trajectory correction projectile based on micro spoiler can provide theoretical foundation for the further study on low cost two-dimensional ballistic correction projectile.The content of the thesis are as follows:1.On the basis of traditional model of flight dynamics,carry out force analysis of the trajectory correction projectile with micro spoiler,and established a 6DOF ballistic model.2.Selecting a fin-stabilized projectile as the example model,and on its basis design four layout schemes of controlled projectile with micro spoiler.Then carry out aerodynamic simulation via different mach numbers and different angles of attack.The thesis analyses outflow field,disturbance around micro spoiler and change of aerodynamic parameters with different angle of attack and mach number,and how the result change with the vary pattern of the mach number.Finally,the thesis carried out a preliminary optimize analysis on the structure of the spoiler on the basis of the aerodynamic parameters and flow field results.3.Based on the model of the ballistic and aerodynamic data,the thesis carries out trajectory simulation analysis.It tries to analyze trajectory correction effect of each model with different shooting angles,study parameters which influence the correction effect and its influence law.At last,the thesis carried out research on ballistic prediction and control strategy.It predicted the impact point at the initial flight stage and analyzed the deviation between impact point and target point to propose proper control strategy to make the projectile land close to the target point position.