本文關(guān)鍵詞： 無線能量傳輸 電磁輻射 時域有限差分法 比吸收率　出處：《中國海洋大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：目前,植入式電子設(shè)備的廣泛應(yīng)用,給醫(yī)療行業(yè)在診斷治療疾病方面帶來了空前的進(jìn)步。之前,很難治愈甚至無法治愈的疾病,因為植入式電子設(shè)備的廣泛使用而被攻破。為了保證植入式電子設(shè)備能夠長期、穩(wěn)定、高效的工作,而采用了無線能量供給(Wireless Power Transmission,WPT)技術(shù)為設(shè)備進(jìn)行能量供給。這樣系統(tǒng)在為體內(nèi)的電子設(shè)備傳輸能量時,會產(chǎn)生不斷變化的電磁場。進(jìn)而,電磁場就會導(dǎo)致人體產(chǎn)生一系列異常反應(yīng),對人體造成一定的傷害,甚至危及生命。因此,為了保證植入式電子設(shè)備能夠安全、高效的工作,對處在電磁環(huán)境下的人體安全性研究非常重要。為此,本文對植入式電子設(shè)備無線傳能系統(tǒng)中電磁輻射安全性進(jìn)行了研究。本文的主要研究工作和創(chuàng)新點總結(jié)如下：本研究首先查閱相關(guān)文獻(xiàn),總結(jié)了電磁輻射對人體作用的表現(xiàn)形式,并對目前國內(nèi)外對人體在電磁場輻射中的安全性問題研究的進(jìn)展進(jìn)行了總結(jié)歸納。然后,運用專業(yè)電磁仿真軟件HFSS對植入式電子設(shè)備的線圈和無線傳能系統(tǒng)進(jìn)行了設(shè)計仿真。線圈設(shè)計采用的是PCB線圈,是為了滿足充電系統(tǒng)應(yīng)盡量小型化的要求。把設(shè)計仿真好的無線傳能系統(tǒng)分別植入到介質(zhì)球模型和人體頭部模型中,進(jìn)行仿真實驗。其次,針對傳統(tǒng)時域有限差分方法在研究植入式電子設(shè)備無線傳能系統(tǒng)中電磁環(huán)境下人體與電磁場相互作用問題時,當(dāng)同一網(wǎng)格內(nèi)出現(xiàn)混合介質(zhì)時,無法得到準(zhǔn)確的數(shù)據(jù),誤差較大。本文通過實驗,驗證了一種適用于該電磁環(huán)境下的FDTD方法。實驗中,通過設(shè)置兩種不同的網(wǎng)格尺寸,即Δx=Δy=Δz=2mm和Δx=Δy=Δz=4mm。實驗結(jié)果表明,該種FDTD方法與傳統(tǒng)FDTD方法相比的精確度較高,并且與商業(yè)軟件CST實驗結(jié)果吻合程度較好。最后,把該FDTD方法運用到人體頭部模型的仿真實驗研究中,通過實驗數(shù)據(jù)對比可以發(fā)現(xiàn),該種FDTD方法和CST軟件仿真結(jié)果吻合較好,并且在人體頭部模型與空氣介質(zhì)的邊緣處均可以得到較為準(zhǔn)確的SAR數(shù)據(jù)。并繪制了運用不同方法時人體頭部模型內(nèi)部SAR數(shù)據(jù)分布對比曲線,驗證了該種FDTD方法的適用性。接著,通過改變系統(tǒng)諧振頻率,進(jìn)行了同樣的實驗,結(jié)果表明,該種FDTD方法與CST軟件吻合結(jié)果較好,且人體頭部電磁模型的邊緣處也能得到準(zhǔn)確的結(jié)果。并且,模型內(nèi)部的SAR值均低于國際安全限制標(biāo)準(zhǔn),表明了無線能量傳輸系統(tǒng)為植入式電子設(shè)備供電是安全的。
[Abstract]:At present, the widespread use of implantable electronic devices has brought unprecedented progress in the diagnosis and treatment of diseases in the medical industry. It was broken down by the widespread use of implanted electronic devices. In order to ensure the long-term, stable and efficient operation of implanted electronic devices, The wireless Power transmission technology is used to supply the energy for the equipment. When the system transmits energy to the electronic devices in the body, it will produce a constantly changing electromagnetic field. Electromagnetic fields will cause a series of abnormal reactions to the human body, causing certain harm to the human body and even endangering life. Therefore, in order to ensure that implanted electronic devices can work safely and efficiently, It is very important to study the safety of human body in electromagnetic environment. In this paper, the safety of electromagnetic radiation in wireless energy transmission system of implanted electronic devices is studied. The main research work and innovation of this paper are summarized as follows: firstly, the relevant literature is consulted in this study. This paper summarizes the manifestation of electromagnetic radiation on human body, and summarizes the progress of research on the safety of human body in electromagnetic field radiation at home and abroad. The coil and wireless energy transfer system of implanted electronic equipment are designed and simulated by using professional electromagnetic simulation software HFSS. The coil is designed with PCB coil. In order to meet the requirement of miniaturization of charging system, the simulated wireless energy transmission system is implanted into the dielectric sphere model and the human head model respectively, and the simulation experiment is carried out. When the traditional finite difference time-domain (FDTD) method is used to study the interaction between human body and electromagnetic field in the wireless energy transmission system of implanted electronic equipment, when a mixed medium appears in the same grid, the accurate data can not be obtained. The error is large. In this paper, an FDTD method suitable for this electromagnetic environment is verified by experiments. In the experiment, two different mesh sizes, 螖 x = 螖 y = 螖 zn 2mm and 螖 x = 螖 y = 螖 zn 4mm, are set. The experimental results show that, The accuracy of this FDTD method is higher than that of the traditional FDTD method, and it is in good agreement with the commercial software CST experimental results. Finally, the FDTD method is applied to the simulation research of the human head model. By comparing the experimental data, it is found that the FDTD method is in good agreement with the simulation results of CST software. More accurate SAR data can be obtained at both the edge of the human head model and the air medium. The comparison curves of SAR data distribution in the human head model with different methods are drawn to verify the applicability of the FDTD method. By changing the resonant frequency of the system, the same experiment is carried out. The results show that the FDTD method is in good agreement with the CST software, and the accurate results can be obtained at the edge of the electromagnetic model of the human head. The SAR values within the model are lower than the international security limit standard, which indicates that wireless energy transmission system is safe to supply power to implanted electronic equipment.
【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TH772.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 和偉;周振祝;王瑩;;人體頭部3層介質(zhì)中的電磁分布[J];云南大學(xué)學(xué)報(自然科學(xué)版);2013年04期

2 周甜;萬隆君;徐軼群;;磁耦合諧振式無線能量傳輸系統(tǒng)特性研究[J];中國科技信息;2012年24期

3 趙軍;徐桂芝;張超;李p，

本文編號：1550254