考虑复杂金属设备的车辆发动机舱电磁环境效应分析

Electromagnetic environment effects for automotive engine block with complex metallic equipments

为了准确地分析高空核电磁脉冲作用下车辆发动机舱内的电磁环境,考虑了散热器、发动机和变速箱等不同形状、位于舱内不同位置的不规则金属设备的影响,计算了舱内500多个观测点的电场强度,并依据自参考方法验证了计算结果的准确性。最后从场强空间分布、场强峰值出现频率和谐振特性三方面分析了舱内的电磁环境。结果表明:舱内场强峰值符合瑞利分布;散热器使主谐振频率发生偏移,发动机使关键区域场强增大;金属设备显著影响舱内场强峰值的最大值,使其提高约一倍。

To precisely analyze the electromagnetic environment in automotive engine block radiated by High Electromagnetic Pulse（HEMP）,the complex metallic equipments with different shapes at different positions,such as radiator,engine and gear-box were considered.The electric fields were computed at more than 500 points in the block,and the results were verified using self-reference method.Finally,the electromagnetic environment was analyzed from views of the electric field distribution,the frequency of occurrence of peak value and the electric field resonances.The results show that the electric peak values are Rayleigh distributed.The radiator leads the shift of the resonance frequency,and the engine results in the increase in electric field in important region.Metallic equipments evidently impact on the maximum electric field peak values in the block,which is doubled.