基于导轨动态响应连续发射的刨削研究

Research on Planing Based on Dynamic Responses of Guide Rail by Continuous Emission

在电磁轨道炮发射的研究中,电磁轨道炮发射过程中电枢在临界速度下,易出现刨削的损伤。为解决上述问题,从动力学角度出发,将发射系统简化为伯努利-欧拉梁模型。综合分析模型在临界状态下导轨产生的扰度变形及导轨结构参数因子对临界速度的影响,并在模型动态响应的基础上,借助动力学软件假设临界状态下电枢导轨发生瞬时撞击,滑动面产生粗糙凸起点。在此基础上分析了连续发射下导轨表面损伤机理。结果表明在临界速度下,导轨产生较大扰度变形,伴随速度增加,刨削作用加剧,导轨表面损伤严重,计算结果与实际相符。研究工作应从结构响应入手,进而采取合理措施,降低刨削发生机率,提高连续发射的稳定性及可靠性。

To solve the planning problem that the under critical speed is easy to appear during the electromagnetic railgun firing process, in this paper, from the dynamic perspective, the launching system was simplified to a Bernoulli -Euler beam. The model of guide rail immunity deformation and the influence of guide rail structure parameters on the critical speed were comprehensive analyzed. Based on the dynamic responses of the model and with the aid of dy- namic software assuming that there is a rough convex point on the slip surfaee at the impact moment, the sliding sur- face damaged mechanism was analyzed under the continuous emission. Results show that under the critical speed, the guide rails generate large deformation of immunity; along with the speed increases, the planing is increased; guide rail surface damage is serious, and the calculation results are in conformity with actual. The research work started with the perspective of the structural response, and then took the reasonable measures and reduced the planing occur- rence probability, which can improve the stability and reliability of continuous firing.