数传发射机圆孔缝电磁散射的边界积分法研究
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摘要
地震电磁探测卫星中的数传发射机箱体能够起到很好的屏蔽作用,但因散热、通风以及与外界电路连接等需要,机箱上不可避免地开有圆孔缝,而其产生的电磁散射有可能对其它星载探测设备造成电磁干扰,是影响机箱屏蔽效能的关键因素。因此,孔缝电磁散射问题是卫星电磁兼容性设计中要加以研究的重要问题。
论文采用计算电磁学的主流方法之一的矢量有限元边界积分法,针对圆孔缝电磁散射的孔缝电尺寸较小,缝隙内部结构复杂,而在圆孔缝以外目标结构为简单的无限开放区域的特点,分析了圆孔缝电磁散射的特性,推导出圆孔缝电磁散射基本条件,根据变分原理得到泛函公式,离散该公式得到圆孔缝的矢量有限元边界积分法公式。
应用高频结构仿真器(Ansoft HFSS)根据矢量有限元边界积分法公式对卫星数传发射机箱体上圆孔缝,插入导线后的圆孔缝(相同长度导线,插入箱体长度不同),机箱散热孔,机箱整体进行数学建模,对其电磁散射进行预测仿真,分析仿真结果得到：从1.350GHz开始,插入导线的圆孔缝电磁散射比没插入导线的电磁散射值大。个别频点(1.380GHz)情况却相反；相同长度的导线,插入箱体的长短不同,散射程度不同,插入箱体的导线越长,散射越严重,个别频点(0.90GHz、1.380GHz)情况相反的结论。结论符合根据导线驱动孔径理论的预想。为判断数传发射机是否对星载设备的正常工作造成影响提供详实数据。
论文给出了各个仿真算例的网格覆盖图,场覆盖图,收敛图,计算图,2D及3D远场方向图等图形,并且所有计算方程都收敛,结果比较精确,为分析多种圆孔缝的电磁散射问题提供了一种新的思路。
Seismic Electromagnetic Detection of satellite digital transmitter box can play a very good shielding effect. But because of it is need cooling, ventilation and electrical connections with the outside, inevitably there are some circular hole seams. Electromagnetic scattering is likely to cause electromagnetic interference to other space-borne detection equipment, which caused by these circular hole seams. This is the key factor that affecting the digital transmitter box's shielding effectiveness.
In this paper, use one of the mainstream methods-vector finite element boundary integral method. For the characteristics of the electric smaller size of circular hole seam electromagnetic scattering, the complex internal structure of seam and the circular hole seam outside objective area has simple structure and is infinite open, analyses the circular hole seam's electromagnetic scattering characteristic, derive circular hole seam electromagnetic scattering basic conditions, According to the variational principle get functional equation. Discreting this formula, get the vector finite element boundary integral equation method formula.
Based on derived formula and Ansoft HFSS, simulate circular hole seam of satellite digital transmitter box without wires are insert into them and insert some wires into it (the wires have the same length,but the boxes'length are different), boxes'cooling holes,electromagnetic scattering of the whole box. Analysis of the obtained results:From the beginning 1350MHz, insert wire hole slit scattering scattering than the conductors did not insert the value of big. The individual frequency (1.380GHz) the situation is the opposite; the same length of wire, insert the box of different lengths, scattering in varying degrees, insert the longer wire box, scattering more serious. The individual frequency (0.90GHz,1.380GHz) On the contrary, it is consistent according to the theory of expected wire-driven aperture. To determine whether the data-transmission transmitter onboard equipment to work to provide detailed data on impact.
The paper provide each kind of graphics about all the simulations,such as grid cover figure, field cover figure, convergence figure, calculation chart and 2D and 3D far field direction figure. Besides all the calculation equations are convergence, the results are accurate.For analysis of many kind of circular hole seams'electromagnetic scattering problem,the paper private a new method.
论文采用计算电磁学的主流方法之一的矢量有限元边界积分法,针对圆孔缝电磁散射的孔缝电尺寸较小,缝隙内部结构复杂,而在圆孔缝以外目标结构为简单的无限开放区域的特点,分析了圆孔缝电磁散射的特性,推导出圆孔缝电磁散射基本条件,根据变分原理得到泛函公式,离散该公式得到圆孔缝的矢量有限元边界积分法公式。
应用高频结构仿真器(Ansoft HFSS)根据矢量有限元边界积分法公式对卫星数传发射机箱体上圆孔缝,插入导线后的圆孔缝(相同长度导线,插入箱体长度不同),机箱散热孔,机箱整体进行数学建模,对其电磁散射进行预测仿真,分析仿真结果得到：从1.350GHz开始,插入导线的圆孔缝电磁散射比没插入导线的电磁散射值大。个别频点(1.380GHz)情况却相反；相同长度的导线,插入箱体的长短不同,散射程度不同,插入箱体的导线越长,散射越严重,个别频点(0.90GHz、1.380GHz)情况相反的结论。结论符合根据导线驱动孔径理论的预想。为判断数传发射机是否对星载设备的正常工作造成影响提供详实数据。
论文给出了各个仿真算例的网格覆盖图,场覆盖图,收敛图,计算图,2D及3D远场方向图等图形,并且所有计算方程都收敛,结果比较精确,为分析多种圆孔缝的电磁散射问题提供了一种新的思路。
Seismic Electromagnetic Detection of satellite digital transmitter box can play a very good shielding effect. But because of it is need cooling, ventilation and electrical connections with the outside, inevitably there are some circular hole seams. Electromagnetic scattering is likely to cause electromagnetic interference to other space-borne detection equipment, which caused by these circular hole seams. This is the key factor that affecting the digital transmitter box's shielding effectiveness.
In this paper, use one of the mainstream methods-vector finite element boundary integral method. For the characteristics of the electric smaller size of circular hole seam electromagnetic scattering, the complex internal structure of seam and the circular hole seam outside objective area has simple structure and is infinite open, analyses the circular hole seam's electromagnetic scattering characteristic, derive circular hole seam electromagnetic scattering basic conditions, According to the variational principle get functional equation. Discreting this formula, get the vector finite element boundary integral equation method formula.
Based on derived formula and Ansoft HFSS, simulate circular hole seam of satellite digital transmitter box without wires are insert into them and insert some wires into it (the wires have the same length,but the boxes'length are different), boxes'cooling holes,electromagnetic scattering of the whole box. Analysis of the obtained results:From the beginning 1350MHz, insert wire hole slit scattering scattering than the conductors did not insert the value of big. The individual frequency (1.380GHz) the situation is the opposite; the same length of wire, insert the box of different lengths, scattering in varying degrees, insert the longer wire box, scattering more serious. The individual frequency (0.90GHz,1.380GHz) On the contrary, it is consistent according to the theory of expected wire-driven aperture. To determine whether the data-transmission transmitter onboard equipment to work to provide detailed data on impact.
The paper provide each kind of graphics about all the simulations,such as grid cover figure, field cover figure, convergence figure, calculation chart and 2D and 3D far field direction figure. Besides all the calculation equations are convergence, the results are accurate.For analysis of many kind of circular hole seams'electromagnetic scattering problem,the paper private a new method.
引文
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