%0 Journal Article
%T PROPER ORTHOGONAL DECOMPOSITION APPLIED IN THE ANALYSIS OF SIMULATING AERO-OPTICAL DISTORTIONS<br>本征正交分解在气动光学畸变仿真中的分析与应用
%A WU Lin
%A FANG Jian-Cheng
%A YANG Zhao-Hua
%A <br>吴琳
%A 房建成
%A 杨照华
%J 红外与毫米波学报
%D 2007
%I Science Press
%X The connection between coherent structure in turbulence and the aero-optical distortions was studied through proper orthogonal decomposition(POD).The computational fluid dynamics(CFD) solutions of high speed turbulence around a missile IR window were used as resource data.Singular vector decomposition was adopted to achieve POD for the spatial-dependent mean flow field.As optical path difference(OPD) is often used to describe optical performance,the low-order singular value of the refractive index fields has good agreement with OPD caused by the source data.Then a plain method for simulating aero-optical distortions was proposed,in which only singular values of refractive index were used.By using the first order singular value,the method can represent the characters of aberrated wave-front,and the relative error of OPD is no more than 2%.The results also validate the argumentation that most aero-optical distortions are caused by coherent structure.
%K aero-optics
%K coherent structure
%K singular value decomposition<br>气动光学
%K 相干结构
%K 奇异值分解
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=D3B4F771D1A06062008B4D0A2EF05996&aid=5F34376FDAF4CB0DE975E8CCD8BE79BF&yid=A732AF04DDA03BB3&vid=96C778EE049EE47D&iid=E158A972A605785F&sid=7737D2F848706113&eid=EC34D52BE81085CE&journal_id=1001-9014&journal_name=红外与毫米波学报&referenced_num=0&reference_num=16