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1、106上.海AER()SPACE航天SHAN(jHAI第33卷2016年第5期文章編號:1006一1630(2016)050106一07靜止軌道實(shí)孔徑微波天線主反熱控方案研究王彥1,康奧峰1,曹韞真2,江世臣1(1.上海衛(wèi)星工程研究所,上海201109;2.中科院上海硅酸鹽研究所,上海200050)摘要:為減小靜止軌道高頻率、大口徑微波天線熱變形,提高天線的指向精度,對國內(nèi)外天線主反射材料和熱控方案進(jìn)行了分析.發(fā)現(xiàn)其材料較一致選用碳纖維蒙皮/碳纖維蜂窩夾層,主反表面涂覆合適吸發(fā)比的真空沉積鋁(VDA)/Al。()一(Si(),)涂層,一方面保證天線電性能對反射率大
2、于99.8%的需求,另一方面使天線整面在軌溫度梯度和波動較小。建立口徑5m天線的熱仿真模型,分析了三種不同吸發(fā)比涂層的天線在不同典型工況下的溫度場分布,結(jié)果表明采用涂層吸發(fā)比o.2/o.2的主反熱變形較小。以碳纖維材料為基體,用真空蒸鍍沉積的方法在其表面鍍制不同厚度的銀層和二氧化硅層,制備出吸發(fā)比約o.2/o.2的VDA/Si():熱控涂層,可用于形狀較復(fù)雜的曲面,且涂層的發(fā)射率隨保護(hù)層厚度可調(diào).顯著提高了熱控設(shè)計的靈活性。關(guān)鍵詞:靜止軌道;熱控;實(shí)孔徑;微波天線;主反射面;碳纖維增強(qiáng)聚合物;真空沉積鋁;吸發(fā)比中圖分類號:V45文獻(xiàn)標(biāo)志碼:ADOI:10.1932
3、8/j.cnki-10()6一1630.2016.05.017ReSearchofRealApertureMicrowaVeAntennaMainReflectorThermalControIMeasuresonGeostationaryEarthorbitWANGYanl,KANGAo—fen91,CAOYun—zhen2,兒ANGShi—chenl(1.ShanghaiInstituteofSatelliteEngineering,Shanghai20l109,China;2.ShanghaiInstituteofCeramics。ChineseAcademy
4、ofSciences,Shanghai200050,China)Abstract:InordertoreducethethermaIdistortionofhigh—frequencyandIargeca“bermicrowaveantennaandimprovethedirectionalprecision,thestudyofmainreflectormaterialandthermalcontrolmeasuresindomesticandabroadwascarrjed.Itfoundthatthecarbonfjberrejnforcementplast
5、ic/carbonfiberreinforcementplastichoneycombwasselectedasthemainreflectormaterialandthemainreflectorwascoveredwithvacuumdepositaluminum(VDA)/A12()3(Si(),)tomakethereflectivityhigherthan99.8%andsatisfytheelectricalperformanceandtomakethemainreflectorhavelesstemperaturegradsandfluctuatio
6、n.ThermalsimuIationmodelofmainrcflectorwith5mwasset.Temperaturefieldswiththreedifferentratiosofs01arabsorptionandemissivityofthecoatundervariousoDerationmodeswereanaIvzed.TheresultsshowedthatthethermaIdistortioncoukibelesswhent}lemainreflectorsurfacewascoveredwithO.2/O.2ratioofsolarab
7、sorptionandemissivityofthecoat.TheVI)A/Si()!melallic1ayeronCFRI’surfacewasmanufacturedandtheanticipanttheratioofsolarabsorI)tionandemissivity(O.2/O.2)wasobtained.Thecoatcanbcapplicdoncomplexcurvedsurfaceandtheemissivityofthecoatcanbeadjustedaccordingtothecoatthickness,whichisbenefitto
8、thede