Stealth analysis and sensitivity calculation of ship air-intake grille
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摘要:
目的 舰船进气格栅的几何参数众多，对所有几何参数开展雷达波隐身性优化的计算成本过大，为此，需掌握格栅雷达散射截面（RCS）灵敏度较大的几何参数序列。 方法 以某典型舰船进气格栅为研究对象，开展进气格栅参数化建模、电磁散射计算参数设定和计算方法研究，利用中心有限差分方法计算各几何参数对屏蔽效率的灵敏度。 结果 获取了各几何参数下的雷达波散射特性变化规律和进气格栅隐身优化的几何参数序列，验证了构建的舰船进气格栅隐身性分析及灵敏度计算方法的合理性和可行性。 结论 分析计算结果可应用于舰船进气格栅的雷达波隐身优化设计中。 Abstract:Objectives Since the geometric parameters of the ship air-intake grilles are numerous, the calculation cost of radar wave stealth performance optimizing for all parameters is too high, and the geometric parameter sequences with high Radar Cross Section(RCS) sensitivity need to be mastered. Methods In this paper, taking one typical air-intake grille of ship as the object, the parameterized modeling, the electromagnetic scattering calculation parameters and the electromagnetic scattering calculation method of the grille had been carried out. The sensitivity of each geometric parameter to shielding efficiency was calculated by using the central finite difference method. Results The variation law of radar scattering characteristics under different geometric parameters, and the geometric parameter sequence for stealth optimization of the air-intake grilles were obtained. Conclusions The stealth analysis and sensitivity calculation method constructed in this paper is reasonable and feasible, and can be widely used in the stealth optimization design of naval air-intake grille. -
Key words:
- air-intake grille /
- radar stealth /
- sensitivity /
- coupling scattering
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表 1 进气格栅几何参数及初始值
Table 1. Geometric parameters and initial values of air-intake grille
参数 初始值 船体宽度B/m 1.5 船体高度H/m 2 开口长度L/m 1.5 开口宽度D/m 1.0 开口圆角半径R/m 0.2 叶片宽度P/m 0.1 叶片间距U/m 0.04 叶片与结构夹角α/（°） 30 
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表 2 不同格栅开口几何参数下的RCS统计结果
Table 2. RCS statistical results under different geometric parameters of grille
开口参数 σ/m2 电磁屏蔽效率/% 初始值 0.538 97.35 L=1.4 m 1.186 89.96 L=1.6 m 0.610 96.53 D=0.9 m 0.630 96.31 D=1.1 m 0.576 96.93 R=0.15 m 0.503 97.75 R=0.25 m 0.603 96.62
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表 3 不同叶片几何参数下的RCS统计结果
Table 3. RCS statistical results under different geometric parameters of blade
开口参数 σ/m2 电磁屏蔽效率/% 初始值 0.538 97.35 P=0.09 m 0.601 96.64 P=0.11 m 0.642 96.17 U=0.03 m 0.627 96.35 U=0.05 m 1.581 85.44 α=25° 0.574 96.95 α=35° 0.824 94.09
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表 4 不同叶片方向及遮挡的格栅RCS统计结果
Table 4. RCS statistical results with different blade direction and back cover of grille
参数 横向叶片 纵向叶片 无遮挡 有遮挡 无遮挡 有遮挡 σ/m2 0.538 2.259 0.444 0.306 电磁屏蔽效率/% 97.35 67.35 93.43 96.56
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表 5 进气格栅各参数对屏蔽效率的灵敏度
Table 5. Sensitivity of air-intake grille parameters to shielding efficiency
几何参数 开口 叶片 L D R P U α 灵敏度 0.493 0.031 0.023 0.023 0.218 0.086
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