Dynamic Characteristic Analysis And Optimal Design Of Magnetic Damping Withdrawal Machine For Small Caliber Gun

As a new principle and technology developed to coordinate the contradictions among gun power,maneuverability,and accuracy,electromagnetic damping and buffering technology is a new direction in the development of gun recoil machine.This paper studies the dynamic characteristics and optimal design of the concentric electromagnetic brake for small caliber gun.The main research contents include:1.Research on the overall design of a concentric electromagnetic recoil machine.Based on the research of electromagnetic damping theory and the design theory of gun recoil machine,a concentric electromagnetic brake scheme suitable for small caliber guns is proposed based on a permanent magnet cylindrical linear damper and a primary array with opposite magnetic poles.Based on the structural form and working characteristics of the recoil machine,the concentric spring recoil machine scheme and the force variation rule of the recoil machine are given.After matching with the barrel,the concentric electromagnetic recoil machine structure is determined.2.Research on damping characteristics of electromagnetic brake under launch load.By analyzing the motion process of the gun under strong impact firing loads,an electromagnetic finite element model of recoil and recoil motion of the gun was established,and the dynamic solution was completed.The influence of permanent magnet,air gap,and inner cylinder structural parameters on the braking effect was analyzed through control variables.Finally,the motion state of the gun under continuous firing conditions was solved by loading cyclic loads.3.Research on thermal stability of electromagnetic brake.By analyzing the heat source and its transfer process inside the brake during gun firing,a performance degradation model of permanent magnets and inner cylinder materials in a temperature rise environment was established.The continuous firing conditions of guns at ambient temperature and high temperature were solved,and the thermal stress analysis of permanent magnets was performed.4.The artificial neural network model is used to train the sample data to obtain a fitting function.The genetic algorithm is used to optimize the structural parameters by taking the impact of backset displacement,loss,and temperature as the objective functions.The analysis results show that the electromagnetic brake has a good match with the structure of the gun.Under normal and high initial temperatures,the electromagnetic brake can stably output braking force,and has good braking characteristics to meet the operational requirements of the gun.The electromagnetic damping buffer technology is feasible for small caliber gun.