权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Electromagnetic wave reflected from a moving body through use of the body fitted grid generation with moving boundary

通过使用具有移动边界的身体拟合网格生成从移动身体反射的电磁波

基本信息

批准号：
07650448
负责人：
KURODA Michiko
金额：
$ 1.28万
依托单位：
Tokyo Engineering University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

The study of electromagnetic scattering by a moving or a rotating body is an important problem for electromagnetic probing of moving body. These problems have been investigated analytically by a Lorentz transformation. However, it is difficult to apply this method to analyze general cases, when scatter shape and vibration are arbitrary. As more detailed information is required concerning microwave interactions with moving bodies, it is necessary to solve these problems numerically. Numerical grid generation is a convenient method to analyze finite difference method on an arbitrary shaped region. We have proposed a novel numerical procedure of grid generation having coordinate line coincident with an arbitrarily shaped moving boundary and applied method. We expanded grid generation into a region including time component. The time dependent curvilinear coordinate system which coincides with a contour of moving boundary in a physical region is transformed into the fixed rectangular coordinate system in a computational region. By using the presented transformation technique, partial differential equations can be solved very easily in the fixed rectangular coordinate system. Finally, we can solve the moving problem in a fixed rectangular coordinate system. In the simple transformation, it is possible to choose the function between the physical region and the computational region. We have applied this technique to the electromagnetic problem. We are treating this method for a quasi-stationary field. With this technique, electromagnetic waves reflected between the parallel perfectly conducting moving plate and electromagnetic scattering from a moving body in an arbitrary direction are analyzed. Some numerical results are compared with the exact ones and excellent agreement between them is obtained.

运动或旋转物体的电磁散射研究是运动物体电磁探测中的一个重要问题。用洛伦兹变换对这些问题进行了分析研究。然而，当散射形状和振动是任意的情况下，这种方法很难应用于一般情况的分析。由于需要更多关于微波与运动物体相互作用的详细信息，有必要用数值方法解决这些问题。数值网格生成是分析任意形状区域有限差分法的一种方便方法。提出了一种坐标线与任意形状的移动边界重合的网格生成的数值计算方法和应用方法。我们将网格生成扩展到一个包含时间分量的区域。将物理区域内与运动边界等值线重合的时变曲线坐标系转换为计算区域内的固定直角坐标系。利用所提出的变换技术，可以很容易地求解固定直角坐标系下的偏微分方程。最后，我们可以解决在固定直角坐标系下的移动问题。在简单变换中，可以在物理区域和计算区域之间选择函数。我们已将这种技术应用于电磁问题。我们将此方法用于拟平稳场。利用该技术，分析了平行完全导电运动板之间的电磁波反射和运动体在任意方向上的电磁散射。将一些数值计算结果与实际计算结果进行了比较，两者吻合得很好。