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为进一步提高电磁轨道炮模型试验的有效性,基于电磁轨道炮物理场模化方法,通过理论分析和数值仿真对电磁排斥力作用下的原型与模型轨道动态响应相似性问题进行了研究。结果显示:如果电磁轨道炮的模化方法,在原型和模型中采用相同材料,并且要同时实现磁场和温度场的匹配,则必将导致应力场的不匹配和轨道动态响应的不相似;在匹配速度的近似模化方法下,原型轨道和模型轨道的临界速度相同,但动态响应属于非线性关系,而且随着弹丸速度和滑动距离的增加,挠度曲线相关系数变小、相似性变差,而振幅比值与几何相似常数近似相等。
In order to further improve the effectiveness of the electromagnetic rail gun model test, the similarity of the dynamic response between the prototype and the model orbit under electromagnetic repulsion was studied by theoretical analysis and numerical simulation based on the physical modeling of the electromagnetic rail gun. The results show that: if the electromagnetic rail gun modeling method, using the same material in the prototype and the model, and to achieve the matching of the magnetic field and the temperature field, will inevitably lead to the stress field mismatch and the dynamic response of the track is not similar; in In the approximate modeling method of matching speed, the critical velocities of the orbit and the model orbit are the same, but the dynamic response belongs to the non-linear relation. With the increase of projectile velocity and sliding distance, the correlation coefficient of deflection curve becomes smaller and the similarity decreases, The amplitude ratio is approximately the same as the geometric similarity constant.