论文部分内容阅读
充气天线的性能主要取决于其形面几何精度。该文以几何非线性有限元法为基础,对不同焦径比和口径的天线反射面进行分析,探讨了三种具有代表性的边界扰动分布形式(均匀扰动、局部扰动及波形扰动)对天线反射面几何形状及应力的影响特性及原因,并分别获得了形面精度对这三种扰动的敏感度。研究从影响区域、影响值大小、影响敏感度及褶皱分布等几个方面对三种扰动形式进行了定性和定量的比较,得到如下主要结论:均匀扰动及波形扰动对整个曲面形状均有影响,在边界影响区曲面会同时产生平移和曲率变化,中间区域则主要发生曲面平移。局部扰动则只对局部区域有影响;三种扰动形式中,在扰动值相同的情况下,均匀扰动引起的误差值最大,但形面误差值对局部扰动和波形扰动更敏感;除施加向外均匀扰动时无褶皱以外,其他扰动形式均会导致在影响区域内出现褶皱。此外,研究还探讨了天线焦径比和口径的影响。最后,在上述研究成果的基础上给出了反射面形面精度被动控制和主动控制的合理建议。
The performance of an airborne antenna depends mainly on the geometry of its profile. Based on the geometrical nonlinear finite element method, the antenna reflection surfaces with different diameters and diameters are analyzed, and three representative forms of boundary perturbation distribution (uniform disturbance, local disturbance and waveform disturbance) are discussed. The influence characteristics and the reasons of the geometry and stress of the reflecting surface and the sensitivity of the surface accuracy to these three disturbances respectively. The paper makes a qualitative and quantitative comparison of the three types of disturbances from the aspects of influence area, influence value, influence sensitivity and wrinkle distribution. The main conclusions are as follows: Uniform disturbance and waveform disturbance affect the shape of the whole surface, In the boundary influence area, the surface will produce both translation and curvature changes, while the middle area will be mainly curved surface. The local perturbation only affects the local area. Among the three kinds of perturbation forms, the average error caused by uniform perturbation is the highest when the disturbance value is the same, but the surface error value is more sensitive to local disturbance and waveform disturbance. Uniform wrinkles without disturbing, the other forms of disturbance will lead to folds in the affected area. In addition, the study also explored the effect of the antenna’s focal ratio and aperture. Finally, on the basis of the above research results, the reasonable suggestions of passive control and active control of the reflection surface accuracy are given.