吸波材料与微波暗室吸波性能研究

主要解决入射波在尖劈吸波材料几何空缺间反射过程的问题以及微波暗室性能是否满足导引仿真要求的问题.对于问题一,首先建立了二维情况下入射波线在尖劈几何空缺间反射过程的数学模型,提出了临界状态的概念,根据光学原理,三角几何原理推出了辐射波在各个反射点处的入射角及反射点距尖劈底面高度表达式,求出了最终反射波的方向、辐射强度.最后根据坐标分解法将其拓展到三维空间.对于问题二,综合考虑辐射波在六个面间的相互影响,运用微元法的思想和微积分的相关知识,推导出静区直接接收到微波信号的公式以及微波信号经整个微波暗室内壁一次反射后被静区接收到的微波功率公式,用数值积分的方法求得了静区得到的反射信号的功率与静区直接得到的微波功率之比,并对部分反射光难以计算的问题提出了数学模型修正的建议和方法.

Research on Absorbing Properties of Absorbing Materials and Anechoic Chamber

This article mainly talks about solving the problem concerning the reflection process of incident wave in the geometrical vacancy of the wedge that can absorb waves, and the problem that whether the property of the microwave in darkroom can satisfy the requirements of guiding simulation.About the first problem,the article set up a 2D mode of the reflection procedure when the incident wave enters the geometrical vacancy of the wedge that can absorb waves,and put forward the concept of critical state;Deduce the incident expressions about the incident angle of radiation wave in every reflection point,and the height from the reflection point to the bottom of the wedge according to the principles of optics and triangle geometrical principles;Get the direction of the final reflection wave and radiation intensity.At last,expand it to 3D according to coordination resolve method.About the second problem,taking the interaction effect of radiation wave in six faces into account,using the method of the means of microelements and related knowledge about calculus,we have reduced the formula of the silent part receiving microwave signal directly,and formula of microwave power which is received by the silent part after the microwave signal is reflected once by the inner wall of the microwave darkroom;Using the method of numerical integration,we have got the power of the reflection signal received by the silent part and power of the microwave received by silent part directly ratios;Then we have put forward some math mode modifying advises and methods about part of problems that reflection wave can hardly solved.