Dynamic response of electromagnetic launcher's rail subjected to harmonic magnetic pressure  

作　　者：刘文 张立功 白象忠 张忠建 

机构地区：[1]School of Sciences,Yanshan University [2]School of Civil Engineering & Mechanics,Yanshan University

出　　处：《Journal of Harbin Institute of Technology(New Series)》2011年第6期120-126,共7页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the National Natural Science Foundation of China(Grant No.50875230)

摘　　要：In order to extend the rail life and improve the firing accuracy,the electromagnetic launcher's rail can be modeled as a beam on elastic foundation with simply supported beam with moving load.Euler beam theory is applied to build the mechanical model and the analytical solution of the equation subjected to harmonic magnetic pressure is derived in details,which has successfully avoided the errors caused by using the uniform pressure to approximately replace the variable force.Numerical analysis of the dynamic response on rail by using the MATLAB software shows that the peak values of maximal deflection and vibration velocity increase gradually as the exciting frequency increases.Taking the same speed of load into account,the dynamic response of rail is obviously smaller than that under constant force.Therefore the reliable theory basis is provided for the design and control of rail to promote the practical application of electromagnetic launcher.In order to extend the rail life and improve the firing accuracy, the electromagnetic launcher＇ s rail can be modeled as a beam on elastic foundation with simply supported beam with moving load. Euler beam theory is applied to build the mechanical model and the analytical solution of the equation subjected to harmonic magnetic pressure is derived in details, which has successfully avoided the errors caused by using the uniform pressure to approximately replace the variable force. Numerical analysis of the dynamic response on rail by u- sing the MATLAB software shows that the peak values of maximal deflection and vibration velocity increase gradually as the exciting frequency increases. Taking the same speed of load into account, the dynamic response of rail is obviously smaller than that under constant force. Therefore the reliable theory basis is provided for the design and control of rail to promote the practical application of electromagnetic launcher.

关 键 词：electromagnetic launcher＇ s rail harmonic pressure analytical solutions exciting frequency dynamic resoonse 

分 类 号：TJ399[兵器科学与技术—火炮、自动武器与弹药工程]