Research On Shooting Process Of Mechanical Arm Under Impact Load

High-precision sniper rifle is an important type of sniper rifle system,which plays an important tactical role in future high-tech local wars.High-precision sniper rifles are a complex system engineering that involves many factors,such as theoretical basis,testing,manufacturing levels,and so on.In this paper,a high-precision sniper rifle was used as the research object.Through theoretical analysis and simulation calculation,the overall design scheme of the high-precision sniper rifle is studied.The internal ballistic simulation calculation,the analysis and calculation of the process of the bullet pushing into the rifle line and the structural dynamics simulation analysis of the main movement construction of the rifle are carried out.Firstly,on the basis of consulting a large number of data and investigation,according to the specific tactical and technical indicators of the high-precision sniper rifle,the overall design scheme is put forward.Secondly,the internal ballistic analysis and calculation model of the high-precision sniper rifle is established,and the variation law of pressure and velocity with time is obtained by programming calculation.According to the two-phase flow interior ballistics,the extrusion mathematical model is derived,and based on this,the process of the projectile extrusion into the rifle is simulated and calculated,and the axial resistance of the projectile during extrusion is obtained based on dynamics and structural force.Based on the basic equations,the dynamic parameters of the opening and closing process,the bullet feeding process,the shell pulling process,the shell throwing process and the parts resetting process of the gun machine are obtained by the dynamic simulation software.The contact stress between the gun machine and the casing body,the contact stress between the pin and the primer,the contact stress between the pin and the pin,the trigger and the pin are obtained by the finite element analysis software.The change of contact stress between the pin and the impact pin.The motion model of 6-DOF motion control manipulator and launching joint is established,D-H method is used to deduce the coordinate relationship and transformation matrix to obtain the kinematic parameter equation of the working joint,and then the working trajectory parameter equation of each joint is obtained by using MATLAB.The software draws the motion space of 6-DOF working joint composed of the motion trajectory parameters of each working joint.At the same time,the first six modal analysis and kinematics and structural dynamics analysis of the manipulator and launching system controlled by six degrees of freedom motion are carried out by using advanced finite element kinetics analysis method.The related technical research results of this paper lay a solid technical and theoretical foundation for further technical research,design and application of engineering automation of this type of launch system.At the same time,it provides a research basis and reference for the use of intelligent manipulator to automatically control the launching system and further improve its firing control accuracy performance.