电磁轨道发射过程中导轨的振动特性研究

Research on Rail Vibration Characteristics during Launch Process of Electromagnetic Rail

针对电磁轨道发射过程中存在的导轨的振动响应问题,将电磁轨道装置简化为固定在弹性支撑上的伯努利-欧拉梁,并将导轨受到的移动载荷简化为均布载荷与集中力的组合形式,建立导轨的通用动力学方程,运用模态叠加法求解得到了振动响应解析解。借助参数化分析语言APDL,仿真不同速度的移动载荷作用下导轨的振动响应,与理论求解进行对比分析,验证了理论计算方法的可行性,并分析了系统的物理特性、结构参数等对临界速度及导轨挠度的影响。研究结果表明,临界速度时导轨的挠度变形最大。研究工作可为电磁轨道装置的结构设计提供参考。

Aiming at the problem of rail vibration response during launch process of electromagnetic rail, the e- lectromagnetic rail launcher was simplified as a Bernoulli - Euler beam fixed on an elastic foundation, and the moving loads on the rail were simplified as the combination form of the uniform distribution load and the concentrated force. The dynamic equation of the rail was established, and then a closed - form solution for the vibration response of the rail was achieved using the method of modal superposition. Based on Parametric Design Language APDL, the vibra- tion responses of the rail under moving loads in different velocities were simulated. The feasibility of theoretical com- puting method was verified by comparing with the numerical computing results. Finally, how the system＇s physical characteristics and structural parameters affect the critical speed and the rail＇s deflection was investigated. The results show that the rairs deflection is the largest at the critical speed. The research work provides a reference for structure design of electromagnetic rail launcher.