The Design And Analysis Of The Steering Gear Of A Small Ballistic Correction Projectile

With the rapid development of detection and identification technology,modern warfare has placed new demands on the capability of weapons to strike accurately.Trajectory correction projectile has become the focus of current research due to its good maneuverability and low manufacturing cost.As an important component of trajectory correction projectile,the performance of actuator directly affects the attacking accuracy of ammunition.Based on the 120 mm mortar bomb,an actuator of trajectory correction projectile is designed and the feasibility of the trajectory correction principle is verified in this paper.The projectile head and the aerodynamic configuration of the wing are designed.The aerodynamic load at the rotor of the wing is obtained through aerodynamic simulation.The mechanism is initially selected with the fuzzy mathematics method,and the kinematics theoretical calculations are carried out for the space 4R(4 revolute joint)mechanism,the spatial RCCR mechanism and the spatial RSSR mechanism;therefore,the required input torque and power of the motor are calculated.Considering the influence of the clearance of joint,that the space4 R mechanism under clearance is more suitable for the actuator is proved by the analysis of the dynamics of the mechanism with ADAMS.In order to explore the influence of the flexible body of different components on the dynamic characteristics of mechanism,with the joint simulation of ANSYS and ADAMS,that the existence of flexible body will significantly deteriorate the contact environment of components and reduce the stability of mechanism motion is verified.The conclusions obtained can guide the selection of component materials.Thereafter,the analysis of launching overload finite element of space 4R mechanism is carried out,which proves that the mechanism meets the strength requirements.The modal analysis and harmonic response analysis prove that the mechanism will not produce resonance due to motor rotation or forced vibration caused by aerodynamic load.The topology optimized design of the mechanism is carried out with Workbench and then the check of the optimized mechanism is carried out.The lightweight mechanism which meets the strength requirements and frequency safety characteristics is therefore obtained.The actuator designed in this paper has the advantages of simple structure,small size,light weight,reliable motion,strong anti-overload ability and good vibration,which is conducive to the practical application of the trajectory correction projectile actuator.