| As the last layer fire barrier of the warship's air and anti-missile defense,small caliber naval gun weapon system is becoming more and more important in the naval battle.In order to intercept the increasing speed of anti-ship missiles effectively,we must improve the firing rate of small caliber naval guns to form a more intense barrage.Thus,the ammunition consumption of the limited capacity of small caliber naval guns will increase dramatically.The current way of ammunition feeding cannot meet the operational needs anymore.So,there is an urgent need to make breakthrough in ammunition feeding technology.Based on the comprehensive analysis and research of the domestic and international rapid-firing gun ammunition feeding system device and its related literatures.The key technology of the small-caliber ship-gun feeding system is taken as the breakthrough point,the module function diagram is established,meanwhile the basic concepts and design criteria of the rapid feeding system are defined.Then,a new type of rapid feeding system is proposed.Its working principle is illustrated,and the structural characteristics of the rammer of replenishment magazine are mainly introduced.In order to ensure the smooth transport of the shells in the rammer,the detailed design calculation of its components is carried out.This paper takes the whole system of the chain drive system of the rammer of replenishment magazine as the research object.Firstly,the polygon effect,the meshing impact and the chain tension to influence the stability of shells transmission is analyzed.Secondly,according to the shape characteristics of the standard tooth profile of the sprocket,and the mathematical judgment condition of the contact is obtained.by analyzing the position relation of the roller-sprocket and the shell-sabot respectively.According to the theory of Hertz,the equivalent contact stiffness coefficient is obtained.Considering the structure of different links,the mechanical model of transmission chain transmission system is established,Lagrange method is used to obtain the elastic dynamic equation of chain transmission system.Then,the chain drive system is numerically analyzed by MATLAB,and the dynamic characteristics of chain drive are analyzed.The transverse vibration of the tight chain is the main cause of the instability of the shell transmission in the rammer.The transverse vibration model of tight chain is established.The stiffness matrix of the chain drive system is obtained by the influence coefficient method,and the differential equations of transverse vibration of the chain are obtained by Lagrange method.Then the numerical calculation of the transverse vibration differential equation is carried out to analyze the natural frequencies and mode shapes under the different motion states and the chain's parameters.After getting the excitation force of the lateral vibration,analyze the displacement response of different link in the chain system of the transmission machine,and provide the theoretical basis for improving the structure of the transmission machine.The simulation of the multi-body dynamics in ADAMS is carried out of the simplified chain drive system model.The simulation results are analyzed.Aiming at the structural strength of the key parts of the transmission machine,the basic idea concept of the finite element analysis are briefly introduced.The finite element analysis software is used to ANSYS static analyze the link and sprocket.The structural improvement of the sabot and the compensation method of elastic deformation of the chain are proposed.Then,the modal analysis of the tight chain of the rammer is carried out.The modal shape of the chain under different motion states is obtained,and the correctness of the transverse vibration equation is verified.The natural frequencies of the sprockets are obtained by modal analysis and the reliability of sprocket work is analyzed. |
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