摘要自上世纪五十年代前苏联发射第一个人造卫星以来,人类航天技术不断进步的同时也带来了空间环境问题,太空空间日益拥挤,卫星碰撞事件时有发生,空间碎片不断积增,对人类航天活动带来威胁,空间碎片环境问题越来越受到人们的关注。文章主要内容有:64357
(1)对空间碎片的轨道分布规律进行了调研,并利用ORDEM2000对国际空间站,欧空局的 ENVISAT 轨道进行了碎片平均通量计算,且对1200km圆形轨道进行通量计算。结果显示欧空局轨道碎片通量高于国际空间站碎片通量,1200km轨道倾角98.5碎片远高于23.5和56.1两个倾角碎片通量。
(2)建立了空间碎片目标在轨飞行的温度计算模型,模型考虑了空间不同热流的影响,以及碎片目标自身的几何参数和物性参数,得到了不同轨道下的碎片目标温度变化规律。分析结果可知,在日照区由于碎片受太阳辐射的影响使碎片温度显著高于阴影区温度。碎片热容、密度越小碎片的温度变化越大。
(3)通过得到的空间碎片温度计算结果,并利用已建立的计算碎片红外辐射的模型,得出了中红外波段(3~5um)和远红外波段(8~10um)的碎片红外辐射。结果表明,在3~5um波段的红外辐射,太阳辐射产生较大作用。在8~10um的红外辐射,太阳辐射的影响可以忽略,地球直接辐射的又很小,主要是目标本身的辐射。
毕业论文关键词 空间目标 温度计算 数值模拟 红外特性
毕业设计说明书(论文)外文摘要
Title Infrared Characterization of space target
Abstract Since the fifties of last century former Soviet Union launched the first artificial satellite,The technology of humans aerospace continuously improve.It also brings some problems and threat space activities.The main work is as follows:
(1)This paper surveys the distribution of space debris and computes the average flux of the International Space Station , ESA ENVISAT and the orbit of 1200km.The results show that ESA ISS orbital debris flux above the debris flux of the International Space Station.The debris of 98.5 orbital inclination are more than others.
(2)Establish the model of debris temperature ,the model considers the effect of different heat flux and geometry and physical parameters of debris and calculates the temperature varies.The results tell us that temperature in sunshine higher than in shadow.the smaller the density and heat capacity of debris the greater temperature change .
(3)Use the temperature calculation results and the model of debris infrared radiation.we can know the infrared radiation of mid-infrared (3~5um) and far-infrared band(8~10um).the results show ,In 3~5um infrared radiation, solar impacts temperature bigger.In 8~10um infrared radiation, solar radiation is negligible and direct radiation of the earth is very small, the main radiation of the target itself.
Keywords Space target Temperature calculation Numerical Simulation Infrared characteristics
1 绪论 1
1.1 课题研究的背景及意义 1
1.2 空间碎片研究现状 3
1.3 本文主要内容 6
2 空间碎片轨道分布 6
2.1 ORDEM2000模型的输入输出量 7
2.2 ORDEM2000模拟轨道碎片分布情况 8
2.3本章小结 11
3 空间碎片温度及红外特性模型