第31卷第7期2023年4月Vol.31No.7Apr.2023光学精密工程OpticsandPrecisionEngineering大口径望远镜次镜桁架调整机构设计卢保伟1,2,张奔雷1,2,王富国1*,杨飞1,陈建波1,2(1.中国科学院长春光学精密机械与物理研究所,吉林长春130033;2.中国科学院大学,北京100049)摘要:大口径望远镜主次镜之间的相对位姿有着非常严格的要求,由于主镜质量较大,因此常常将次镜系统设计为有多个自由度的可调整机构,其调整效果对望远镜成像有着重要的影响。为了降低望远镜的整体高度,对次镜桁架和次镜调整机构进行融合,设计了一种可用于大口径望远镜的次镜桁架调整机构。首先对所设计的调整机构进行了详细的介绍,之后对所设计的机构进行静力学和模态分析,然后对试验样机进行运动学性能测试。所设计的机构在Z方向的移动行程可达±5mm,绝对定位精度优于16μm,在X/Y方向的偏转行程可达±0.574°,绝对定位精度优于6.4″。满足大口径望远镜对次镜调整精度和行程的要求。关键词:大口径望远镜;次镜系统;调整机构;支撑结构中图分类号:TH703文献标识码:Adoi:10.37188/OPE.20233107.1043DesignoftrussadjustingmechanismforsecondarymirroroflargeaperturetelescopeLUBaowei1,2,ZHANGBenlei1,2,WANGFuguo1*,YANGFei1,CHENJianbo1,2(1.ChangchunInstituteofOptics,FineMechanicsandPhysics,ChineseAcademyofSciences,Changchun130033,China;2.UniversityofChineseAcademyofSciences,Beijing100049,China)*Correspondingauthor,E-mail:wfg109@163.comAbstract:Inlarge-aperturetelescopes,therelativepositionsoftheprimaryandsecondarymirrorsmustconformtostringentspecifications.Thesecondary-mirrorsystemisfrequentlydesignedasanadjustablemechanismwithseveraldegreesoffreedom,owingtothehighqualityoftheprimarymirror.Thissignifi⁃cantlyaffectsthetelescopeimaging.Thesecondary-mirrortrussandadjustmentmechanismarecombinedanddesignedtodecreasetheoverallheightofthetelescope.Moreover,asecondary-mirrortruss-adjust⁃mentmechanismthatcanbeemployedinlarge-diametertelescopesisdesigned.First,adetaileddescrip⁃tionofthedesignedadjustmentmechanismisgiven,followedbystaticandmodalanalyses,andfinally,akinematic-performancetestoftheexperimentalprototype.Themovingstrokeofthedesignedmechani...