串联增强型电磁轨道炮螺栓预紧封装性能分析

为了研究螺栓连接预紧方式的串联增强型轨道炮的身管封装性能，从电磁场的角度出发，计算了电磁轨道炮发射时导轨中的电磁力，进而得到了身管应力、应变和位移量。建立三维串联增强型电磁轨道炮离散预紧身管模型，计算了在一种斜坡电流激励条件下导轨的应力、应变和位移量的变化规律，以及身管封装部件应力、应变及位移的变化规律。从计算结果看出，在螺栓预紧条件下，导轨及身管处于一定初始位移及应力、应变下，随着电流的逐渐增大和作用时间增大，各参量也逐渐增大，且呈现明显的波动状，导轨的位移在螺栓位置有明显的下降趋势。身管部件的最大位移量远小于导轨的位移量，保证了与导轨的接触，也在一定程度上控制了导轨的最大位移量，对身管的封装性能有积极的作用。

The Encapsulation Performance Analysis of Series Enhanced Electromagnetic Railgun with Bolt Pre-tightening

For the purpose of studying the encapsulation performance of series enhanced electromag-netic railgun with bolt pre-tightening,calculated was the electromagnetic force of the rails from the per-spective of electromagnetic field with the stress,strain and displacement of the gun barrel achieved. Then a three dimensional series enhanced railgun tube model was built,and a ramp current was loaded to calculate the changing law of rail stress,strain and displacement. And these parametrical varying patterns of the barrel units were also obtained. As the calculation results show,under the condition of the blot pre-tightening,the rails and the barrel units are under the impact of certain initial displace-ment,stress and strain. With the gradual increase of the current and duration,the parameters of rail and barrel units were increased gradually with an obvious fluctuation pattern. The rail displacement in the bolt position shows obvious drop trend. And the displacement of barrel units was smaller than that of the rail,so the rail and the barrel unit can have good contact condition. This phenomenon demon-strates that the use of discrete seal barrel with bolt pre-tightening can control the maximum displace-ment of the rail to a certain extent,which works well for the barrel encapsulation performance.