汽车散热器近场电磁屏蔽特性仿真研究

Emulation Research of Car Radiator's Near Fields Electromagnetic Shielding Effectiveness

汽车散热器是阻碍汽车电磁干扰泄漏的有效屏障。通过分析汽车散热器结构,将其简化成具有一定厚度的密集孔阵结构,进而建立其仿真计算模型。利用有限积分法FIT,研究了汽车散热器结构参数对其近场电磁屏蔽效能的影响。计算结果发现:其它条件相同时,散热器截面单孔面积越小,孔间距越大,散热器厚度越大,则其近场屏蔽效能越高;铜质散热器近场屏蔽效能明显大于同规格的铝制散热器;矩形孔散热器的近场屏蔽效能高于同规格的梯形孔散热器;采用对称排列的梯形孔散热器其近场屏蔽效能略高于采用斜交排列的梯形孔散热器。

Car radiator is an effective barrier to the car＇s electromagnetic interference. After analyzing the structure of car radiator, it is simplified to be a compact hole pattern model with some thickness, and then comes to the emulation computational model. By using the Finite Integration Technique （FIT）, it is researched how the structure parameters of car radiator influence its near fields electromagnetic shielding effectiveness. From the emulation results, it can be found out that： ceteris paribus, less hole area, longer hole distance and thicker radiator mean the car radiator＇s near fields electromagnetic shielding effectiveness higher. As for the near fields electromagnetic shielding effectiveness, ceteris paribus, copper car radiator is higher than aluminous one, car radiator with rectangle hole is higher than that with trapezium hole, and car radiator with symmetrical arrangement trapezium hole is higher than that with oblique arrangement trapezium hole.