电磁轨道发射身管动态响应影响发射过程中枢轨接触状态和导轨疲劳寿命,以及射击精度,本文将螺栓预紧型电磁轨道发射身管简化为Winkler弹性基础上双层Euler-Bernoulli梁模型,推导身管动力学位移解析解,利用有限元分析软件建立模型进行仿真并从时间和空间维度分析电磁发射过程中身管振动过程,从身管振动挠度和导轨与外封装板相对位移两方面分析不同结构参数和材料性能对身管振动特性的影响机理,为后续对电磁轨道发射弹道分析,和在连续发射工况下电磁发射装置动力学特性的研究奠定基础。
The dynamic response of electromagnetic launchers influences the contact between the rail and the armature, fatigue life of the rail and the firing accuracy. A double-deck Euler-Bernoulli rail on Winkler elastic foundation is used to simplify the bolt pre-tightening electromagnetic launcher. The analytical solution of the dynamic response model is deduced. A finite element model of the housing is developed to simulate and analysis the vibration process of electromagnetic launcher in the view of time and space. The influence mechanism of different structural parameters and material properties on the transient resonance is analyzed from two aspects:the vibration deflection of the rail and the relative displacement between the rail and the containment. These results provide a foundation for further research of trajectory analysis, as well as transient resonance in electromagnetic launchers under repeat firing.
2019,41(3): 101-107 收稿日期:2017-08-30
DOI:10.3404/j.issn.1672-7649.2019.03.020
分类号:TJ99
基金项目:国家自然科学基金重点资助项目(51607187,51522706,51407191,51307176);国家973计划资助项目(613262)
作者简介:蔡喜元(1993-),男,硕士研究生,研究方向为电磁发射技术
参考文献:
[1] FAIR H D. Progress in electromagnetic launch science and technology[J]. IEEE Transactions on Magnetics, 2007, 43(1):93-98
[2] MCNAB I R. Large-scale pulsed power opportunities and challenges[J]. IEEE Transactions on Plasma Science, 2014, 42(5):1118-1127
[3] 李永池. 波动力学[M]. 合肥:中国科学技术大学出版社, 2015.
[4] STONKUS R, RACKAUSKAS J, SCHNEIDER M, et al. Structural mechanics of railguns with open barrels and elastic supports:The influence of multishot operation[J]. IEEE Transactions on Plasma Science, 2015, 43(5):1510-1515
[5] JOHNSON A J, MOON F C. Elastic waves and solid armature contact pressure in electromagnetic launchers[J]. IEEE Transactions on Magnetics, 2006, 42(3):422-429
[6] TZENG J T. Dynamic response of electromagnetic railgun due to projectile movement[J]. IEEE Transactions on Magnetics, 2003, 39(1):472-475
[7] TZENG J T. Structural mechanics for electromagnetic railguns[J]. IEEE Transactions on Magnetics, 2005, 41(1):246-250
[8] LEWIS K B, NECHITAILO N V. Transient resonance in hypervelocity launchers at critical velocities[J]. IEEE Transactions on Magnetics, 2007, 43(1):157-162
[9] 何威, 白象忠. 方口径电磁轨道发射装置导轨及壁板的动力响应[J]. 振动与冲击, 2013, 32(15):144-148 HE Wei, BAI Xiang-zhong. Dynamic responses of rails and panels of rectangular electromagnetic rail launcher[J]. Journal of Vibration and Shock, 2013, 32(15):144-148
[10] WILLIAM T T, MARIE D D, DA Li, et al. Theory of vibration with application (Fifth Edition)[M]. Beijing:Tsinghua University Press, 2005, 258-289.