无线发射机辐射致热效果的精密建模分析
发布时间：2018-09-05 13:39
【摘要】：本文旨在研究处于435MHz频率辐射下人体头部所产生的热效果。首先使用商业软件Xfdtd6.3对对讲机模型、眼球模型、头部模型和手部模型建模。对讲机模型以摩托罗拉CP1200为模板建立，包含外壳、天线、电池、PCB板几个主要部分。眼球模型包含8种组织，基本上对人体眼球做了最精细的划分。头部和手部模型的建立选择在类似研究中广泛使用的Zubal人体模型来实现，通过编写程序对Zubal教授等建立的人体模型三维数组进行处理，得到本文需要的而且能够在Xfdtd6.3直接调用的模型。其次，利用三维旋转技术对人体模型进行组合，并且设定人体各种组织在435MHz频率下的电磁参数。利用Xfdtd6.3对组合后的模型进行计算，对模型使用了不均匀网格的剖分，将眼球的分辩率设定为0.25mm，人体其他组织的分辨率设定为1mm，以求得在连续正弦波辐射下人体头部的SAR分布情况。最后，基于生物热传导方程及其边界条件利用C语言编写了非均匀网格的温度计算程序，计算温度场分布及其随时间变化的规律。在C语言程序中，针对于本文中所使用模型的一些情况做了一些特殊处理，包括各种组织边界的处理、人体头部截面的处理、非均匀网格剖分过渡区域的处理等。这样做即能真实的反映出人体头部各种组织的温升情况，又能有效的突破计算机内存的限制，减少计算时间。 在本文研究的辐照模型中，当频率为435MHz，入射功率为0.5W时，人体皮肤的最后温度为33.7416℃，眼角膜的最后温度为32.6168℃。人体皮肤和眼角膜由于电磁辐射所引起的温升分别为0.0409℃和0.0412℃，，而且可以发现皮肤和眼球组织的平均温升相对于其他组织要高很多。
[Abstract]:The purpose of this paper is to study the thermal effect of human head under 435MHz frequency radiation. First, the commercial software Xfdtd6.3 is used to model the interphone model, eyeball model, head model and hand model. The interphone model is based on Motorola CP1200, including shell, antenna and battery board. The eyeball model consists of eight tissues, basically the most refined division of the human eyeball. The establishment of head and hand models is realized by using Zubal mannequins, which are widely used in similar studies, to process three-dimensional arrays of human models established by Professor Zubal. Get the model needed in this article and can be called directly in Xfdtd6.3. Secondly, the 3D rotation technique is used to combine the human body model, and the electromagnetic parameters of various human tissues at 435MHz frequency are set. The combined model is calculated by Xfdtd6.3, and the model is divided by non-uniform mesh. The resolution of the eyeball was set to 0.25 mm and the resolution of other human tissues was set to 1 mm in order to obtain the SAR distribution of human head under continuous sine wave radiation. Finally, based on the biogenic heat conduction equation and its boundary conditions, a non-uniform grid temperature calculation program is developed using C language to calculate the temperature field distribution and its variation with time. In the C language program, some special treatments are made for some cases of the models used in this paper, including the processing of various tissue boundaries, the processing of human head cross-sections, the processing of non-uniform meshes and the processing of transition areas, and so on. In this way, it can reflect the temperature rise of various tissues of human head, and can effectively break the limit of computer memory and reduce the computing time. In the irradiation model studied in this paper, when the frequency is 435 MHz and the incident power is 0.5 W, the final temperature of human skin is 33.7416 鈩
本文编号：2224435
[Abstract]:The purpose of this paper is to study the thermal effect of human head under 435MHz frequency radiation. First, the commercial software Xfdtd6.3 is used to model the interphone model, eyeball model, head model and hand model. The interphone model is based on Motorola CP1200, including shell, antenna and battery board. The eyeball model consists of eight tissues, basically the most refined division of the human eyeball. The establishment of head and hand models is realized by using Zubal mannequins, which are widely used in similar studies, to process three-dimensional arrays of human models established by Professor Zubal. Get the model needed in this article and can be called directly in Xfdtd6.3. Secondly, the 3D rotation technique is used to combine the human body model, and the electromagnetic parameters of various human tissues at 435MHz frequency are set. The combined model is calculated by Xfdtd6.3, and the model is divided by non-uniform mesh. The resolution of the eyeball was set to 0.25 mm and the resolution of other human tissues was set to 1 mm in order to obtain the SAR distribution of human head under continuous sine wave radiation. Finally, based on the biogenic heat conduction equation and its boundary conditions, a non-uniform grid temperature calculation program is developed using C language to calculate the temperature field distribution and its variation with time. In the C language program, some special treatments are made for some cases of the models used in this paper, including the processing of various tissue boundaries, the processing of human head cross-sections, the processing of non-uniform meshes and the processing of transition areas, and so on. In this way, it can reflect the temperature rise of various tissues of human head, and can effectively break the limit of computer memory and reduce the computing time. In the irradiation model studied in this paper, when the frequency is 435 MHz and the incident power is 0.5 W, the final temperature of human skin is 33.7416 鈩
本文编号：2224435
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