基于电火花毛化工艺的无磁钢表面吸波性能研究

发布时间：2018-06-07 21:34

本文选题：电磁兼容 + 电火花毛化　；参考：《华东交通大学》2017年硕士论文

【摘要】：随着国内外微电子技术的不断发展,设备或系统中电子元器件的数量越来越多,其内部的电磁兼容问题也日益凸显。在机车质量的评估中,关于其电磁兼容问题也提出了相应的标准。为了有效解决机车关键电气部件的电磁干扰问题,本文将针对电火花毛化表面吸波问题展开研究。论文首先从电火花毛化机理出发,分析其放电的形成发展过程和表面形貌的形成机理,得出毛化表面呈均匀分布的凹坑-凸起结构特征。继而,以电火花成型加工机床的电参数选择问题为主导,分析电参数对毛化形貌的影响,得出毛化表面平均凹坑直径受脉冲宽度的影响较大,峰值电流对凹坑直径的影响呈不规律性,但对凹坑深度起主要作用。继而,在分析随机粗糙表面的形貌参数的基础上,运用FDTD Solutions软件对粗糙面吸收电磁波能力进行仿真研究。得出粗糙面的高度均方根对表面反射场和透射波强度的影响较大,高度均方根越大,反射场分部越疏散,透射率越小;表面相关长度对反射场和透射率起次要影响,随着相关长度的增大,反射场分布呈疏密相间变化规律,透射率先减后增。最后,运用积分球光通量计对红外波激励下的毛化样品的反射波通量进行测量,得出电火花毛化表面具有较好的吸波性能,随着脉冲宽度的增加,表面反射波通量有明显的先减后增的“U”形变化趋势;随着峰值电流的增加,毛化表面红外波的吸收效率呈现先增后减的“(?)”形变化趋势。
[Abstract]:With the development of microelectronic technology at home and abroad, the number of electronic components in equipment or system is increasing, and the electromagnetic compatibility problem is becoming more and more prominent. In the evaluation of locomotive quality, the standard of EMC is also put forward. In order to effectively solve the electromagnetic interference problem of the key electrical components of locomotive, this paper will study the surface wave absorption problem of electrospark hairing. Firstly, based on the mechanism of electrospark piling, the formation and development process of discharge and the formation mechanism of surface morphology are analyzed, and the concave and bulge structure characteristics of uniformly distributed surface are obtained. Then, the selection of electrical parameters of EDM machine tools is taken as the dominant factor, and the influence of electrical parameters on the morphology of texturing is analyzed. It is concluded that the average diameter of pits on the furred surface is greatly affected by the pulse width. The effect of peak current on the diameter of the pit is irregular, but it plays a major role in the depth of the pit. Then, on the basis of analyzing the morphology parameters of the random rough surface, FDTD Solutions software is used to simulate the electromagnetic wave absorption ability of the rough surface. The results show that the RMS of rough surface has a great influence on the surface reflectance and transmission wave intensity. The larger the RMS, the smaller the transmittance and the smaller the reflectance, and the less the reflectance and the reflectance are affected by the correlation length of the surface. With the increase of the correlation length, the distribution of the reflectance field changes with the density phase, and the transmission decreases first and then increases. Finally, the reflection wave fluxes of the wool samples excited by infrared wave are measured by integrating sphere luminometer, and the results show that the surface of EDM has better absorbing property, and the pulse width increases with the increase of the pulse width. The surface reflected wave flux has the tendency of decreasing first and then increasing "U" shape, and with the increase of peak current, the absorption efficiency of the infrared wave on the Maoized surface is increased first and then decreased. The trend of change.
【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG661

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