Formation Mechanism and Simulation Analysis of Railgun Gouging
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摘要: 对电磁轨道炮发射过程中轨道表面的刨削现象进行了研究,根据其发射特点提出了微角度斜冲击引起的刨削形成机理,根据实际轨道炮的结构和载荷特点,应用LS-DYNA有限元软件在不同的参数条件下进行了数值仿真计算。计算表明,随着电枢前端倒角的增大轨道的刨削深度减小,电枢的质心位置后移也可以减小刨削深度,并且这些因素对刨削深度的影响并非是线性的。研究结果为进一步抑制轨道刨削现象的发生提供了依据。
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关键词:
- 轨道炮 /
- 刨削 /
- LS-DYNA有限元软件 /
- 仿真
Abstract: The phenomenon of gouging on the surface of the rail in the process of electromagnetic railgun launching was studied.For its launching characteristics, we proposed a formation mechanism of gouging due to oblique impact of small angle based on the actual structure and load characteristics of railguns, and numercal simulation was carried out with the finite element software LS-DYNA under variable parameters.The results show that the depth of gouging decreases with the enlargement of the front end chamfering.The moving backward of the barycentric position of armature increases the threshold speed of gouging, but it also increases the depth of gouging.And the impact of these factors on the depth of gouging is not linear.The new formation mechanism and numerical method provide a new effective way for the anti-gouging research.-
Key words:
- railgun /
- gouging /
- LS-DYNA /
- simulation
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表 1 电枢和轨道的几何参数
Table 1. Geometric parameters of armature and rail
Component Length/
(cm)Width/
(cm)Height/
(cm)Armature 2.5 1.0 1.7 Rail 25 2 1 表 2 电枢和轨道材料参数
Table 2. Material parameters of armature and rail
Component Density/
(g/cm3)Elasticity
modulus/(GPa)Poisson
ratioYield strength/
(MPa)Plasticity tangent
modulus/(GPa)β Failure
strainArmature 2.82 70 0.33 455 0 1.0 0.8 Rail 8.90 124 0.33 546 0 1.0 0.8 表 3 质心位置的变化
Table 3. Changes of the centroid positio
(cm) a b c 2.585 1.52 1.095 2.680 1.58 1.260 2.780 1.64 1.290 3.020 1.78 1.340 -
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