植入式醫(yī)療設備無線能量傳輸系統(tǒng)電磁環(huán)境下的人體安全性研究
發(fā)布時間：2019-01-17 19:34
【摘要】：隨著科技的發(fā)展,各類電磁設備產生的電磁輻射對人體安全的影響逐漸引起國內以及國際的普遍重視。人體在不同頻率的高強度電磁輻射環(huán)境下會產生不同的病狀,受到電磁輻射少可造成身體發(fā)熱、神經疼痛,受到電磁輻射多可導致神經錯亂、心臟衰竭、灼傷乃至致死。由于目前人體植入式醫(yī)療設備電源電量的有限性,對于將無線傳能系統(tǒng)應用于人體植入式醫(yī)療設備進行無線能量補給的研究越來越多,因此人體在無線傳能過程中系統(tǒng)產生的電磁輻射環(huán)境下的安全性研究就顯得極為重要。 為此,本文針對人體與植入式醫(yī)療設備無線能量傳輸系統(tǒng)電磁環(huán)境之間的相互作用原理和電磁仿真方法進行了比較詳細地分析研究,主要的研究工作和創(chuàng)新點總結是： 1.在介紹生物電磁學及生物電磁劑量學基本知識的基礎上,對時域有限差分法的基本原理和要點作了歸納。 2.提出了一種融入等效寬度技術的非均勻網格生成算法,在網格剖分軟件中設置△Xmin,△Ymin,△Zmin以及RX, Ry, RZ,若沿x軸縮小模型尺寸,△Xmin可以在符合數(shù)值色散公式的基礎上設置的大一點進行粗網格剖分；由于非均勻網格剖分方法網格尺寸在x,y,z方向上是不斷變化的,因此在獲得實際模型的等效尺寸時,需要求得劃分為粗網格方向的網格單元尺寸的平均值,即該方向上的模型尺寸與網格數(shù)的比值,通過此平均值將計算模型的尺寸在相應方向減小半個網格,得到等效尺寸模型；重復第一個步驟,進行網格剖分。通過實驗驗證,說明了融入等效寬度技術的非均勻網格剖分算法在FDTD仿真時的準確性和有效性。 3.將融入等效寬度技術的非均勻網格生成算法應用于植入式醫(yī)療設備無線能量傳輸系統(tǒng)電磁環(huán)境下人體頭部和人體比吸收率SAR計算當中,研究無線傳能系統(tǒng)諧振天線位于人體不同部位時的SAR分布情況,然后將求解結果與現(xiàn)今的國際國內衛(wèi)生標準進行了比較。
[Abstract]:With the development of science and technology, the influence of electromagnetic radiation produced by various kinds of electromagnetic equipment on human safety has been paid more and more attention both at home and abroad. The human body under different frequency of high intensity electromagnetic radiation environment will produce different symptoms, less electromagnetic radiation can cause body fever, nerve pain, electromagnetic radiation can lead to nervous disorder, heart failure, burns and even death. Due to the limitation of power supply of implanted medical devices, more and more researches have been made on wireless energy supply for implantable medical devices. Therefore, it is very important to study the safety of human body in the electromagnetic radiation environment. Therefore, the interaction principle and electromagnetic simulation method between human body and implanted medical device wireless energy transmission system are analyzed in detail in this paper. The main research work and innovation are summarized as follows: 1. Based on the introduction of the basic knowledge of bioelectromagnetics and bioelectromagnetic dosimetry, the basic principles and main points of the FDTD method are summarized. 2. In this paper, a non-uniform mesh generation algorithm with equivalent width technique is proposed. Xmin, Ymin, Zmin and RX, Ry, RZ, are used to reduce the size of the model along the x axis in the mesh generation software. Xmin can be used for coarse mesh generation on the basis of a large point set on the basis of the numerical dispersion formula. Since the mesh size of the non-uniform mesh generation method is constantly changing in the direction of xyniz, it is necessary to obtain the mean value of the size of the mesh element divided into coarse grid directions when obtaining the equivalent size of the actual model. That is, the ratio of the model size to the mesh number in this direction, the size of the model is reduced by half a mesh in the corresponding direction through this average value, and the equivalent size model is obtained. Repeat the first step for mesh generation. Experimental results show the accuracy and effectiveness of the non-uniform mesh generation algorithm with equivalent width technique in FDTD simulation. 3. A non-uniform mesh generation algorithm incorporating the equivalent width technique is applied to the SAR calculation of the head and the specific absorption rate of the human body under the electromagnetic environment of the wireless energy transmission system of implanted medical equipment. The SAR distribution of the resonant antenna in different parts of the human body is studied, and the results are compared with the current domestic and international health standards.
【學位授予單位】：中國海洋大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM724
本文編號：2410309
[Abstract]:With the development of science and technology, the influence of electromagnetic radiation produced by various kinds of electromagnetic equipment on human safety has been paid more and more attention both at home and abroad. The human body under different frequency of high intensity electromagnetic radiation environment will produce different symptoms, less electromagnetic radiation can cause body fever, nerve pain, electromagnetic radiation can lead to nervous disorder, heart failure, burns and even death. Due to the limitation of power supply of implanted medical devices, more and more researches have been made on wireless energy supply for implantable medical devices. Therefore, it is very important to study the safety of human body in the electromagnetic radiation environment. Therefore, the interaction principle and electromagnetic simulation method between human body and implanted medical device wireless energy transmission system are analyzed in detail in this paper. The main research work and innovation are summarized as follows: 1. Based on the introduction of the basic knowledge of bioelectromagnetics and bioelectromagnetic dosimetry, the basic principles and main points of the FDTD method are summarized. 2. In this paper, a non-uniform mesh generation algorithm with equivalent width technique is proposed. Xmin, Ymin, Zmin and RX, Ry, RZ, are used to reduce the size of the model along the x axis in the mesh generation software. Xmin can be used for coarse mesh generation on the basis of a large point set on the basis of the numerical dispersion formula. Since the mesh size of the non-uniform mesh generation method is constantly changing in the direction of xyniz, it is necessary to obtain the mean value of the size of the mesh element divided into coarse grid directions when obtaining the equivalent size of the actual model. That is, the ratio of the model size to the mesh number in this direction, the size of the model is reduced by half a mesh in the corresponding direction through this average value, and the equivalent size model is obtained. Repeat the first step for mesh generation. Experimental results show the accuracy and effectiveness of the non-uniform mesh generation algorithm with equivalent width technique in FDTD simulation. 3. A non-uniform mesh generation algorithm incorporating the equivalent width technique is applied to the SAR calculation of the head and the specific absorption rate of the human body under the electromagnetic environment of the wireless energy transmission system of implanted medical equipment. The SAR distribution of the resonant antenna in different parts of the human body is studied, and the results are compared with the current domestic and international health standards.
【學位授予單位】：中國海洋大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM724
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