雷達(dá)罩頻率選擇表面的設(shè)計(jì)及激光精密加工技術(shù)研究
[Abstract]:Frequency selective surface (Frequency Selective surfaces) is a single-layer or multi-layer planar structure composed of many passive resonant units arranged periodically in two dimensions. FSs has certain frequency selective characteristics for electromagnetic and optical waves. Etching two-dimensional periodic aperture units or sticking metal patch elements on metal thin films to form an "electric oscillator structure", Thus, the FSS radome can be formed by the combination of band pass (open hole type) or band stop (patch type) for electromagnetic wave. It is very important to reduce radar cross section (RCS),) of aircrafts effectively. The aim of this paper is to design and emulate the FSS of radar radome with two dimensional plane, regular surface, complex surface, and high precision and high efficiency machining technology. The FSS design of radar radome and the research of projective laser precision machining technology are carried out. Firstly, the main factors affecting the design of planar FSS and the method of model design are discussed. The influence of geometric dimension design parameters and incident angle 胃 of plane wave on the electromagnetic filtering characteristics is analyzed. The finite integration time domain method is used to simulate and calculate. The surface electric field distribution and near field energy distribution were obtained. Secondly, aiming at the developable regular surface radome, a method of FSS design, modeling and simulation of direct-pasted regular curved surface radome is adopted. The adaptive integral model and improved equation of time-domain integral theory algorithm for curved surface FSS simulation are described in detail. Based on the finite integration time domain method, the transmission characteristic curves and RCS reduction characteristics of circular slot cylindrical and conical conformal FSS are simulated and analyzed. Thirdly, an integration method of modeling and conformal periodic graphic layout of complex surface workpieces based on on-line measurement point cloud data is proposed, and an example simulation is implemented based on CATIA software. The full wave simulation analysis of complex curved Y-hole FSS radome is carried out by using the finite integration time domain (FITD) method. At the same time, the wide-band transmittance and aiming error of complex curved Y-hole FSS radome are studied by introducing the array seeker phased array antenna. The results show that the new FSS modeling and layout design method for complex curved radome is a feasible engineering method. Finally, the principle and technological process of parallel projection mirror scanning (PPGS) laser precision etching technology are introduced. Based on the PPGS laser precision machining equipment developed by our research group, the plane, cylinder and cone surface radar cover FSS samples are experimentally processed. The microstructure of etching boundary and the microstructure of SEM are analyzed and the transmission characteristic curves are measured. The results show that the PPGS laser precision machining technology can be compatible with the manufacture of FSS for plane, regular surface and complex surface radome. It is a feasible technical scheme to solve the problem of high efficiency and "cross scale" processing and manufacturing of large complex surface radome FSS.
【學(xué)位授予單位】:溫州大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TN957;TN249
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