Two-dimensional Correction Mechanism Correction Strategy And Simulation Analysis

Modern war pays much more attention to the precision strike capability of arms and ammunition,striving to complete the mission as little cost as possible.Ballistic correction has been favored by the military powers because it has the characteristics of higher strike precision and lower cost.Ballistic correction use the correction mechanism to change the aerodynamic force and moment of the projectile to realize the ballistic trajectory correction.Two-dimensional correction mechanism as the mainstream of current ballistic correction mechanism.How it influence the projectile aerodynamic layout and how it work to correct the ballistic trajectory need to focus on resolving.Firstly,through the understanding of the present situation and tendency of the development of two-dimensional trajectory correction.A fixed canard correction mechanism is adopted for trajectory correction of high-speed rotating projectile.Based on the theory of external ballistics,the aerodynamic forces and moments of the projectile and the canard are analyzed.The correction principle of the fixed canard mechanism is analyzed,and the correction strategy around the theoretical trajectory correction is adopted.Secondly,according to the aerodynamics principle,the finite element model of the common projectile and the correction projectile with fixed canard is established and the aerodynamic simulation is carried out.The change law of the main aerodynamic coefficients with the angle of attack and Mach number of common projectile,correction projectile and canard mechanism is obtained.Thirdly,based on the theory of rigid body motion and the aerodynamic characteristics of the projectile,the kinematic model of common projectile and correction projectile is established by using ADAMS dynamic simulation platform.The simulation of anti-rotation control and the real-time attitude monitoring of the canard roll are carried out during the correction projectile flight.Finally,through kinematics simulation,analyzed the fixed duck rudder impact on the projectile trajectory,the maximum lateral and longitudinal correction ability at the projectile out of the muzzle and the apex of trajectory.According to the modified strategy,the lateral and longitudinal correction of the projectile under random wind and initial jump angle are simulated.