本文選題：電磁兼容 + 有限元法��； 參考：《河北科技大學(xué)》2015年碩士論文

【摘要】：隨著電子產(chǎn)品的日益更新,以及數(shù)字系統(tǒng)工作頻率的日趨提高,電磁兼容問(wèn)題也變得更加突出,而電磁屏蔽作為電子設(shè)備設(shè)計(jì)的一項(xiàng)重要內(nèi)容,也越來(lái)越引起技術(shù)人員的關(guān)注。首先分析了電磁屏蔽機(jī)理,討論了幾種目前應(yīng)用于電磁耦合問(wèn)題的電磁場(chǎng)數(shù)值計(jì)算方法,然后使用基于有限元法編制的Ansoft軟件分別對(duì)電子設(shè)備外部屏蔽機(jī)箱及內(nèi)部PCB的屏蔽效能進(jìn)行了模擬仿真分析,為電子設(shè)備機(jī)箱的屏蔽設(shè)計(jì)及PCB板的合理布局提供一定的參考。完成的主要工作有:1)以帶孔的電子屏蔽箱體為對(duì)象,采用Ansoft HFSS軟件研究了在外部源的干擾下孔的形狀、尺寸、厚度及數(shù)量對(duì)屏蔽體屏蔽效能的影響,得出了影響帶孔腔體屏蔽特性的關(guān)鍵因素和一般規(guī)律。2)以帶縫隙的電子屏蔽箱體為對(duì)象,應(yīng)用有限元法研究了縫隙的長(zhǎng)度、數(shù)量、方位等對(duì)腔體屏蔽特性的影響,得出了影響腔體屏蔽特性的主要因素和一般規(guī)律。3)以電子設(shè)備內(nèi)部的PCB板為對(duì)象,對(duì)PCB板中高頻干擾帶來(lái)的電磁兼容問(wèn)題進(jìn)行了仿真分析。首先采用軟件SIwave分析了裸板的諧振情況,指明了諧振分析在電路設(shè)計(jì)中的重要性。然后采用軟件Cadence與Ansoft SIwave相結(jié)合的方式得到PCB近場(chǎng)圖,為PCB的電磁兼容性設(shè)計(jì)提供數(shù)據(jù)支持。4)以輻射強(qiáng)度較大的0.9GHz近場(chǎng)圖為參考依據(jù),通過(guò)調(diào)整敏感元件、信號(hào)線(xiàn)、高頻激勵(lì)走線(xiàn)的位置以及走線(xiàn)之間的寬度來(lái)改善PCB的電磁兼容性能,為PCB板的前提布局設(shè)計(jì)提供一定的參考依據(jù)。
[Abstract]:With the updating of electronic products and the increasing frequency of digital system, the problem of electromagnetic compatibility becomes more and more prominent. As an important part of electronic equipment design, electromagnetic shielding has attracted more and more attention of technicians. Firstly, the mechanism of electromagnetic shielding is analyzed, and several numerical calculation methods of electromagnetic field which are used in electromagnetic coupling problem are discussed. Then the Ansoft software based on finite element method is used to simulate and analyze the shielding effectiveness of external shielding case and internal PCB of electronic equipment, which provides a certain reference for the shielding design of electronic equipment chassis and the reasonable layout of PCB board. The main work accomplished is: (1) taking the electronic shielding box with holes as the object, the effects of the shape, size, thickness and quantity of the holes on the shielding effectiveness of the shielding body under the interference of external sources are studied by using Ansoft HFSS software. It is concluded that the key factors and general rules affecting the shielding characteristics of the cavity with holes are as follows: (2) the effects of the length, quantity and orientation of the slot on the shielding characteristics of the cavity are studied by using the finite element method, taking the electronic shielding box with the slot as the object. The main factors affecting the shielding characteristics of the cavity and the general rule. 3) taking the PCB board inside the electronic equipment as the object, the electromagnetic compatibility problem caused by the high frequency interference in the PCB board is simulated and analyzed. Firstly, the resonance of bare plate is analyzed by software SIwave, and the importance of resonance analysis in circuit design is pointed out. Then the near field diagram of PCB is obtained by combining software Cadence and Ansoft SIwave, which provides data support for the design of EMC of PCB. 4) based on the 0.9GHz near field diagram with high radiation intensity, the sensitive element and signal line are adjusted. In order to improve the EMC performance of PCB, the position of high frequency excitation line and the width between lines can be improved, which provides a certain reference for the design of PCB board's premise layout.
【學(xué)位授予單位】：河北科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN03

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 王飛;若干電磁輻射方式下的電磁效應(yīng)仿真計(jì)算[D];華北電力大學(xué)（北京）;2011年

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本文編號(hào)：1883634