【作者】 金鹏；

【导师】 王卫荣；

【作者基本信息】 合肥工业大学 ， 机械电子工程， 2007， 硕士

【摘要】 电磁屏蔽是为了验证电子设备电磁兼容性设计的合理性以及电子设备质量的手段，同时在产品设计前后利用ANSYS电磁场分析可以科学地评价电子设备是否符合电磁兼容性标准或规范。提高电子仪器箱体的电磁屏蔽效能，可分为防止低频干扰的磁屏蔽以及防止高频场干扰的电磁屏蔽，其中结构设计以及材料研制是主要手段，而通过ANSYS有限元仿真技术建立电磁场环境加以分析是一条有效的途径。在低频段，材料的选择及接地处理为影响屏蔽设计的主要因素。文中采用化学沉积方法制备稀土镍基的Ni-Fe-B合金镀层，并通过ANSYS分析考察了电磁波频率和材料厚度的变化，以及稀土的加入对常态下和在盐雾腐蚀下的Ni-Fe-B合金镀层电磁屏蔽性能的影响，说明Ni-Fe-B合金不仅电磁屏蔽性能良好，而且具有优良的耐腐蚀性。在高频段，随着频率的增高，材料种类及厚度的影响变为次要因素。利用ANSYS电磁场分析，文中研究了箱体上所存在的各类孔洞面积和缝隙尺寸，对箱体电磁泄露大小的影响，以达到尽可能提高箱体的通风散热下，减小箱体的重量、体积和成本等的增加，进一步解决箱体的电磁兼容问题。论文的目的就是希望在箱体电磁屏蔽设计阶段权衡利弊，采取合理的措施，以最佳费效比来满足电子仪器箱体电磁兼容性要求。更多还原

【Abstract】 Electromagnetic shielding is a measure to validate the rationality of EMC design and the quality of electron equipment, and uses ANSYS electromagnetic analysis can scientifically evaluate the electron equipment whether fulfils the criterion or standard of EMC in fore-and-aft design. The cabinet of electromagnetic shielding has two parts: magnetic-shield in the low-frequency and electromagnetic shielding in the high- frequency. T he structure design and material development are the primary measures to improve electromagnetic shielding efficiency by using ANSYS electromagnetic environment to analyze.In the low-frequency, material and earthing are primary factor. The paper uses electroless deposition Ni-Fe-B alloy electromagnetic shielding coating that is added the rare earth elements, and we investigate the electromagnetic shielding capability of Ni-Fe-B alloy through the change of electromagnetic frequency, the thickness of material by ANSYS analysis and the add rare earth elements in normalcy and salt fog, it shows Ni-Fe-B alloy not noly has a good electromagnetic shielding capability, but also has a superior corrosive capability.In the high-frequency, as electromagnetic frequency enhances, the kind and thickness of material have become the subordinate factor. The paper uses ANSYS analysis to study the influence which the hole area and the gap dimension to the electromagnetism leakage in order to increase heat dissipation as well as decrease the weight, the bulk, the cost of the cabinet as far as possible and solve the problem of EMC.The paper hopes to weigh the advantages and disadvantages in the cabinet design of electromagnetic shielding, and use logical and optimal cost-effective-ratio measurement to satisfy EMC of the electron equipment cabinet design.更多还原