摘要
星载抛物面天线在绕地球工作时会产生较大的热变形。为了获得在近地服役环境下全尺寸反射器型面精度模拟的工程方法,采用ABAQUS有限元和最小二乘法,对口径1.2 m的小尺寸蜂窝夹层结构天线进行热变形和均方根(RMS)值计算,对热膨胀系数、蜂窝高度和蒙皮铺层数量等因素进行分析。结果表明:蜂窝高度方向的热膨胀系数是影响RMS值的最主要因素。当蜂窝高度为65 mm,上、下蒙皮铺层数量为12层时,型面精度RMS值满足设计要求。最后基于实际装配条件计算全尺寸反射器在−80~120℃下的热变形,发现紧固件和预埋件可以有效减小工作面热变形,并且得到全尺寸反射器RMS值为40.45μm。该研究结果可为星载固面蜂窝夹层结构反射面天线结构的设计提供依据。
Satellite-borne parabolic antenna will generate large thermal deformation when it works around the earth.In order to obtain an engineering method for the profile accuracy simulation of full-size reflectors in a near-ground service environment,the ABAQUS finite element method and the least square method are used to calculate the thermal deformation and root mean square(RMS)values of the small-sized honeycomb sandwich antenna with a diameter of 1.2 m and analyze the factors such as the thermal expansion coefficient(TEC),the honeycomb height,and the number of skin layers.The results show that the TEC in the honeycomb height direction is the most important factor affecting the RMS values.When the honeycomb height is 65 mm and the number of the skin layers is 12,the RMS value of the profile accuracy fulfills the design requirements.Finally,the thermal deformations of the full-size reflector at the temperatures from−80ºC to 120ºC are calculated based on the actual assembly conditions.It is found that the fasteners and embedded parts can effectively reduce the thermal deformations of the working plane,and the RMS value of the full-size reflector is 40.45μm.The research results can provide a basis for the design of the antenna structure of the rigid reflector with satellite-borne honeycomb sandwich structure.
作者
张弘弛
梁旭豪
王晓蕾
田杰
史丽萍
ZHANG Hongchi;LIANG Xuhao;WANG Xiaolei;TIAN Jie;SHI Liping(National Key Laboratory of Science and Technology on Advanced Composites in Special Environments,Harbin Institute of Technology,Harbin 150080,Heilongjiang,China;Shanghai Composite Materials Technology Co.,Ltd.,Shanghai 201112,China)
出处
《上海航天（中英文）》
CSCD
2020年第1期107-112,共6页
Aerospace Shanghai（Chinese&English）
基金
上海航天科技创新基金资助项目(SAST2016118)
关键词
蜂窝夹层结构
星载抛物面天线
热变形
型面精度
影响因素分析
honeycomb sandwich structure
satellite-borne parabolic antenna
thermal deformation
profile accuracy
analysis of the affecting factors
