Radar cross section of axisymmetric objects
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Abstract:
A method for computing the resonant region scattering by slender axisymmetric objects with arbitrary surface impedance is outlined. This method employs matching of the electric and magnetic fields on axis. Results obtained by this method have been used to generate contour maps of radar cross section (RCS) as a function of frequency and aspect. Maps for three conducting cones and a cone-spheroid covering the diameter-to-wavelength range of 0.05 to 0.70 are shown. The relationship of the high and low frequency asymptotic behavior to the mapped results is discussed. Computed and measured RCS patterns are compared.Keywords:
Radar cross-section
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Non-axisymmetric 弄醒影响实验为低速度在最好的激动频率以后被执行轴的压缩机被 axisymmetric 发现了弄醒影响实验。当数字和入口指南翼(IGV ) 的环绕的分发是逻辑的时， IGV 能施加有益的不稳定的激动的 non-axisymmetric 的 wakes 在他们的下游的转子流动领域上完成并且改进压缩机鈥檚 表演。在现在的纸，四 non-axisymmetric 弄醒计划被发现比 axisymmetric 更好工作的影响弄醒影响计划。与基础计划相比，最好的 non-axisymmetric 计划增加了压缩机鈥檚 山峰效率，和全部的压力上升 1.1 和 2% ，并且在 4.4% 提高了货摊边缘。non-axisymmetric 计划比 axisymmetric 计划作为从 IGV 产生的不稳定的激动信号的变化被解释的更好可行的主要原因醒来。除高周波的部件以外， non-axisymmetric 计划产生了一个有益的低频率的方形波浪的激动信号和另外的第二等的频率部件。与 axisymmetric 计划相比，激动弄醒从 non-axisymmetric 计划产生的多频率更容易得到与象清理旋涡，经过旋涡和流的旋涡那样的复杂旋涡联合关系。关键词轴的压缩机 - Non-axisymmetric - 醒来 - 联合中国(50476003 ) 的国家自然科学基础和 BUAA 的革新基础为博士支持的工程毕业。
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The scattering of electromagnetic waves from random rough surfaces near the grazing incident problem is of widespread interest in various physical situations, in particular coastal and shipborne radar backscatter. It is, however, a very difficult problem still awaiting a satisfactory analytical solution. Two of the features which have been seen experimentally and yet have not been explained analytically are sea spikes, and unexpectedly large hh/vv scattering cross section compared to the analytical solutions available. In this paper we present a numerical study of backscatter cross section for the above situation. The numerical calculation was done using the Petit method, which unlike the better known method of moments (MOM), allows calculation to be done for the case of large angle incidence.
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Radar cross-section
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Born approximation
Scattering cross-section
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The stability of long liquid bridges under non-axisymmetric disturbances like a microgravitational force acting perpendicular to the liquid bridge axis or a non-coaxiality of the disks is analyzed through an asymptotic method based on bifurcation techniques. Results obtained indicate that such non-axisymmetric effects are of higher order than those produced by axisymmetric perturbations.
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Abstract This paper presents isoparametric finite element formulation for special classes of elements referred to as ‘transition elements’ for axisymmetric stress analysis. The transition elements are necessary for applications requiring the use of both axisymmetric solids and axisymmetric shells. These elements permit transition from the axisymmetric solid portion of the structure to the axisymmetric shell portion. The element properties are derived and presented in detail. Numerical examples are also presented to demonstrate the accuracy and applications of such elements.
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Abstract Shooting and bouncing rays (SBR) is a numerical method based on geometric optics developed to compute the electromagnetic scattering from jet inlets and partially open cavity structures. This method is used to study the effects of shaping on the radar cross‐section (RCS) of cavities. Two cylindrical cavity structures are analysed: one with a uniform circular cross‐section, and the other with a non‐uniform cross‐section varying from a triangular shape to a circular shape. By bending the longitudinal axis of a cylindrical cavity, a significant reduction in RCS at near axial incidence can be achieved.
Radar cross-section
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Stress field
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A procedure for obtaining the reactive loads of an N -port loaded scatterer to maximize the radar cross section is given. The method involves obtaining the real port currents which maximize radiation power gain and then resonating these currents to make them the dominant characteristic mode of the body.If the scatterer is loss-free and the loads are closely spaced, a large but very frequency sensitive scattering cross section is obtained. This behavior is basically the same as that of supergain behavior in antenna theory.
Radar cross-section
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Shaping for targets is a main technology of radar cross section (RCS) reduction. In this paper the RCS of several different cross section cylinders are predicted, and the comparison between them is also presented. The conclusion from the comparison is helpful for very low observation designs, such as stealth aircraft.
Radar cross-section
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Axisymmetric numerical codes are often used in modeling non-destructive testing phenomena, to approximate geometries and defects which are not truly axisymmetric in nature. This is especially true in cases where large computational resources are needed to model the exact geometry. However, there has been no study to confirm the nature and extent of errors introduced by an axisymmetric approximation. The gas pipeline industry makes use of bath axisymmetric and non-axisymmetric magnetizers for the magnetic flux leakage inspection of pipelines. The authors utilize this platform to perform a comparative analysis of axisymmetric and non-axisymmetric magnetizers from a design perspective and also study the differences in respective electromagnetic behavior.
Magnetic Flux Leakage
Leakage (economics)
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