简化电磁发射装置中的导轨和电枢为线电流下的直导体，建立发射装置的物理模型。利用毕奥－萨伐尔定律和感应电动势原理，推导出磁探针线圈中心放置点的磁感强度。假设线圈范围内的磁场为均匀磁场，计算得到磁探针线圈产生的电动势。以此设计测量所用的磁探针，并和测试数据对比验证模型的正确性。在多次试验中发现，发射过程中装置振动导致磁探针距离变化和角度偏转问题。测量并分析三组单次发射中的故障测试状态。仿真和实验数据表明：小范围距离变化没有使磁探针的测试性能失效，但角度偏移对下一步的速度拟合带来误差干扰，且随着角度增大拟合速度逐步减小。%Simplified rails and armature as straight conductor with line current,the model of electromagnetic launcher was established.The magnetic intensity of the magnetic probe coil center position was calculated by using Biot-Savart law and the principle of induction electromotive force.Under the assumption that the magnetic field is a uniform magnetic field,the electric potential of the coils was elaborated.An applied probe was designed and the model was verified by comparing with the test data.The issue that probe ’s distance change and angle deflection under vibration was raised,the fault states in three groups single shot were measured and analyzed.Simulation and experimental data show that the magnetic probe do not cause failure with a small range of distance variation,while the angle deflection has an interferer on fitting velocity,with the deflection adding the fitting velocity falling.
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