(4)在
CAD系统中建立定位夹紧件和骨架逻辑构件模型 ,在此基础上实施骨架元件建模和元件间相贯处理 ,以及骨架刚度校核等过程 ,完成后提交制造 ,接下来开展定位器的详细设计。
所开发的飞机装配型架布局设计软件工具已在某型号飞机的后机身装配型架上应用验证 ,包含逻辑构件的骨架和定位器详细设计结果如图 8所示。
图 8 后机身装配型架部分设计结果 Fig18 Part of latter2airframe assembly tooling design result
5 结 论
对飞机制造大型工装布局问题进行了描述 ,并引入逻辑构件对飞机制造大型工装进行抽象建模。在此基础上提出了一种依据布局约束要求分级演进求解的布局设计算法 ,该算法实用性强、表达直观、实现方便。基于该算法所开发的布局设计工具充分考虑到可定位性、刚度要求、工装开敞性和人机工程等布局约束 ,为飞机制造大型工装提供了概念设计支持 ,大大减少了设计迭代 ,降低了返修率。此后的工作可对工装概念设计知识表达和协同概念设计进行研究。
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作者简介 :潘志毅 (1977 -) 男 ,博士研究生。主要研究方向 :飞机数字化快速生产准备技术。
Tel : 025284891836 E2mail : panzhiyi @nuaa. edu. cn
黄翔 (1965 -) 男 ,博士 ,教授 ,博士生导师。主要研究方向 :数字化设计与制造 ,航空宇航制造技术。 Tel : 025284892910 E2mail : xhuang @nuaa. edu. cn
李迎光 (1976 -) 男 ,博士 ,副教授。主要研究方向 :飞机数字化快速生产准备技术。
Tel : 025284891836 E2mail: welcome.li@nuaa.edu.cn
(责任编辑 :蔡斐 ,杨冬 )
文章编号 :100026893 (2008) 0320675206
飞行器表面缝隙电磁散射特性研究
黄沛霖 ,刘战合 (北京航空航天大学航空科学与工程学院 ,北京 100083)
Research on Electromagnetic Scattering Characteristics of Slits on Aircraft
(多缝隙 )缝隙间距的变化规律 ,以及其极化特性。不同宽度单缝测试结果表明 :对于水平极化 ,缝隙宽度小于波长的 1/ 4时 ,缝隙的宽度增加将导致缝隙引起的表面波散射快速增长 ,反之 ,呈下降趋势 ;对于垂直极化 ,缝隙宽度较小时试件的电磁散射与无缝金属平板接近 ,当缝隙宽度大于波长的 1/ 2时 ,宽度增加时 ,其散射增强。多缝隙测试结果表明缝隙间距会影响散射的空间分布、波峰位置 ,可以理解为对各单缝隙散射叠加效果的影响。垂直极化影响强于水平极化。关键词 :飞行器 ;隐身 ;电磁散射中图分类号 : V218 文献标识码 :A Abstract : Slits are feeble sources among the various electromagnetic scattering sources on a traditional aircraft. But for the stealth military aircraft , scattering contribution of slits is remarkable since the main sources are heavily reduced. To analyze the scattering characteristics of slits at different polarizations , a slit was placed in the diagonal of a metal plate to weaken the influence of metal edges and the diagonal was placed from vertical to horizontal. By means of a series of rodar cross section (RCS) testing , the polarization rules , width parameter influence , interval parameter influence , and other characteristics of slits are investigated. Experiments with different slit widths demonstrate two points: for HH polarization , when the slit width was less than a quarter of the wavelength , increase in slit width would considerably enhance the surface wave effect , but when it was greater than a quarter of the wavelength , its increase tended to reduce scattering ; for VV polarization , the scattering of the test piece was close to a plate with no slit when the slit width was small and scattering was en2 hanced when the slit width was greater than half of the wavelength. Experiments with multi2slits show that in2 terval parameters would have an impact on the RCS distribution and peak location by coupling the effect of in2 dividual slits. The influence of VV polarization was greater than HH polarization. Key words : aircraft ; stealth ; electromagnetic scattering 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：航空学报08大飞机专刊(57)
