Objective On-orbit assembly represents a promising approach for constructing large-aperture space antennas, which are essential for advanced communication, Earth observation, and deep space exploration. However, the modular assembly process inherently introduces cumulative errors, such as surface deviations and potential module interference, due to assembly gaps and alignment inaccuracies. These errors can compromise overall surface accuracy and assembly feasibility. This study aims to develop a deformation adjustment strategy for module units to suppress error propagation, mitigate interference risks, and ensure high assembly precision and system performance. Methods A comprehensive modeling and analysis framework was established. First, a parabolic antenna model incorporating assembly gaps was developed. Using a planar projection method, nodal coordinates of the module units were generated. A gap conversion model was iteratively applied to determine the spatial positions of modules in each concentric ring. A three-point circumferential docking mechanism and a unidirectional assembly sequence (from the center outward) were designed, resulting in six distinct error propagation chains. Second, an assembly error analysis was conducted based on the concepts of error chains and error balls. A six-degree-of-freedom error model was constructed using the product-of-exponential (POE) method. Random displacement and rotational errors were generated at virtual assembly centers, simulating error propagation along the chains. A 61-module antenna was analyzed to quantify the effects of assembly gap size (100~300 mm) and maximum allowable displacement error (10~40 mm) on cumulative error. Finally, a deformable module configuration was proposed to counteract error accumulation. By releasing nodal degrees of freedom and integrating actuators on the reflective surface, the module could achieve graded adjustment capabilities, from single-face to six-face deformation. A scenario-based adjustment scheme was formulated, dynamically modifying module edge lengths and angles according to the number of contact faces and interference conditions. The feasibility of the design and adjustment strategy was validated through simulations using simplified planar models of the deformable modules. Results and Discussions The error analysis revealed that assembly errors accumulate progressively along the error chains, with a positive correlation with both assembly gap size and maximum allowable displacement error. For instance, with a 200 mm assembly gap and a 10% maximum displacement error allowance, the maximum displacement error at the assembly center reached 16.99 mm. Error accumulation accelerated with increasing module ring numbers, highlighting the risk of exceeding docking mechanism tolerances and causing module interference. Simulation results for deformable modules under various adjustment scenarios (two-, three-, four-, and six-sided adjustments) demonstrated effective shape adaptation to target configurations. Actuator stroke distances and directions were successfully determined for each case. For example, in the two-sided adjustment scenario, one face extended by 50 mm while the other contracted by 24.93 mm, achieving the desired interface matching. The simulations confirmed that the proposed module design and adjustment logic can effectively compensate for misalignments and prevent interference. Conclusions This study presents a systematic approach to modeling, analyzing, and mitigating assembly errors in modular on-orbit assembled antennas. The key conclusions are: 1) Assembly errors accumulate along error chains and are proportional to assembly gap size and maximum allowable displacement error. 2) A deformable module unit configuration capable of one- to six-sided adjustments effectively counteracts error-induced misalignments and interference. 3) A scenario-based adjustment scheme enables dynamic module reshaping according to contact and interference conditions. 4) Simplified model simulations verify the feasibility of both the deformable module design and the adjustment strategy. The proposed strategy offers a viable solution for managing error accumulation in large-scale in-space antenna assembly, enhancing both assembly feasibility and operational performance. Future work will focus on detailed freedom analysis and mechanical redesign of deployable hexagonal modules to realize the proposed deformation capabilities in engineering practice.
WuZhigang, JiangJianping, WuShunan,et al.Research progress in dynamics and control of space assembly for aerospace structures[J].Advances in Mechanics,2024,54(2),344‒390. doi:10.6052/1000-0992-23-041
MaXiaofei, LiYang, XiaoYong,et al.Research status and prospect of large deployable antenna reflectors[J].Space Electronic Technology,2018,15(2):16‒26. doi:10.3969/j.issn.1674-7135.2018.02.003
OegerleW R, PurvesL R, BudinoffJ G,et al.Concept for a large scalable space telescope:In-space assembly[C]//Space Telescopes and Instrumentation I:Optical,Infrared, and Millimeter.Bellingham:SPIE,2006,6265:755‒766. doi:10.1117/12.672244
[6]
DatashviliL, EndlerS, WeiB,et al.Study of mechanical architectures of large deployable space antenna apertures:From design to tests[J].CEAS Space Journal,2013,5(3):169‒184. doi:10.1007/s12567-013-0050-9
[7]
ValiniaA, MoeR, SeeryB D,et al.ISS-based development of elements and operations for robotic assembly of a space solar power collector[C]//Annual International Space Station Research and Development Conference.Greenbelt:GSFC,2013:GSFC-E-DAA-TN 9751.
[8]
WangMingming, LuoJianjun, YuanJianping,et al.Review of space on-orbit assembly technology[J].Acta Aeronautica et Astronautica Sinica,2021,42(1):47‒61. doi:10.7527/S1000-6893.2020.23913
LillieC F.On-orbit assembly and servicing of future space observatories[C]//Space Telescopes and Instrumentation I:Optical,Infrared,and Millimeter.Bellingham:SPIE,2006,6265:767‒778. doi:10.1117/12.672528
[11]
ChenTi, LiaoDengliang, LiuShujie,et al.Review on dynamics and control of on-orbit assembly for spacecraft swarms[J]. Journal of Vibration Engineering,2025,38(12):2847‒2864. doi:10.16385/j.cnki.issn.1004-4523.202506017
ZhaoLiangliang, JiangWei, ZhaoYunpeng,et al.Design of primary mirror interface for on-orbit assembly of space telescopes[J].Manned Spaceflight,2024,30(6):753‒762.
NairM H, RaiM C, PoozhiyilM,et al.Robotic technologies for in-orbit assembly of a large aperture space telescope:A review[J].Advances in Space Research,2024,74(10):5118‒5141. doi:10.1016/j.asr.2024.08.055
[16]
OegerleW R, PurvesL R, BudinoffJ G,et al.Concept for a large scalable space telescope:In-space assembly[J].Space Telescopes and Instrumentation Ⅰ:Optical,Infrared,and Millimeter,2006:62652C. doi:10.1117/12.672244
[17]
DatashviliL, EndlerS, WeiB,et al.Study of mechanical architectures of large deployable space antenna apertures:From design to tests[J].CEAS Space Journal,2013,5(3):169‒184. doi:10.1007/s12567-013-0050-9
QinLi, FangGuangqiang, GuoJunkang,et al.Research on surface accuracy modeling and regulation algorithm of modular antenna for on-orbit assembly[J].Aerospace Manufacturing Technology,2024,6:1‒9.
ZouYongliao.Moon:A transit station for space exploration and the best place for scientific research[J].Friend of Science Amateurs,2004(3):42.
[22]
邹永廖.月球:太空探测的中转站最佳科学研究场所[J].科学之友,2004(3):42.
[23]
KelleyB N, CooperJ R, Puig‒NavarroJ,et al.Designing a software architecture for the precision assembly of space structures[C]//AIAA Scitech 2022 Forum.Reston:AIAA,2022:2077. doi:10.2514/6.2022-2077
[24]
MitsugiJ, YasakaT.Deployable modular mesh antenna and its surface adjustment[J].International Journal of Space Structures,1993,8(1/2):53‒61. doi:10.1177/0266351193008001-206
[25]
MitsugiJ, WatanabeM, MeguroA,et al.Module composition and deployment method on deployable modular-mesh antenna structures[J].Acta Astronautica,1996,39(7):497‒505. doi:10.1016/s0094-5765(97)85430-6
[26]
SugimotoT, TsunodaH, HariuK I,et al.Structural design and deployment test methods for a large deployable mesh reflector[C]//Proceedings of the 38th Structures,Structural Dynamics,and Materials Conference.Reston:AIAA,1997:AIAA‒ 1997‒1148. doi:10.2514/6.1997-1148
[27]
TsunodaH, HariuK I, KawakamiY,et al.Deployment test methods for a large deployable mesh reflector[J].Journal of Spacecraft and Rockets,1997,34(6):811‒816. doi:10.2514/2.3291
[28]
TianDake.Design and experimental research on truss structure for modular space deployable antenna[D].Harbin:Harbin Institute of Technology,2011. doi:10.7666/d.D264092
MaXiaofei, LiYang, LiTuanjie,et al.Design and analysis of a novel deployable hexagonal prism module for parabolic cylinder antenna[J].Mechanical Sciences,2021,12(1):9‒18. doi:10.5194/MS-12-9-2021
[31]
RouvinetJ, UmmelA, CosandierF,et al.PULSAR:Development of a mirror tile prototype for future large telescopes robotically assembled in space[C]//Proceedings of the Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV.Bellingham:SPIE,2020:272. doi:10.1117/12.2576237
[32]
GrallaE L, De WeckO.On-orbit assembly strategies for human space exploration[C]//56 th International Astronautical Congress.Paris:IAF,2005:123‒130. doi:10.2514/6.iac-06-d3.3.03
[33]
LiH, LyuS, MaX,et al.Topology design of modular unit and cable network of on-orbit modular‐assembled antenna[J].International Journal of Aerospace Engineering,2024,2024(1):6385683. doi:10.1155/2024/6385683
[34]
LiHuanxiao, LvShengnan, MaXiaofei,et al.Design method for modular units of space antennas assembled on-orbit[J].Journal of Mechanical Engineering,2024,60(13):345‒353.
HaradaS, ShimizuM, MitsugiJ.A shape error estimating method for connecting the modular antenna reflector[C]//Proceedings of the 17th AIAA International Communications Satellite Systems Conference and Exhibit.Reston:AIAA,1998:AIAA‒ 1998‒1226. doi:10.2514/6.1998-1226
[37]
EgronS, SoummerR, MichauV,et al.James Webb Space Telescope optical simulation testbed Ⅳ:Linear control alignment of the primary segmented mirror and the secondary mirror[C]//Proceedings of the UV/Optical/IR Space Telescopes and Instruments:Innovative Technologies and Concepts Ⅷ.Bellingham:SPIE,2017:37. doi:10.1117/12.2272981
[38]
HuHaiyan, TianQiang, WenHao,et al.Dynamics and control of on-orbit assembly of ultra-large space structures[J].Advances in Mechanics,2025,55(1):1‒29. doi:10.6052/1000-0992-24-044
DongHangjia.Analysis of assembly errors and performance control study of space modular antennas on-orbit assembly[D].Xi'an:Xidian University,2023.
[41]
董航佳.空间模块化天线在轨装配误差分析及性能调控研究[D].西安:西安电子科技大学,2023.
[42]
FuGuoqiang, FuJianzhong, ShenHongyao,et al.Product-of-exponential formulas for precision enhancement of five-axis machine tools via geometric error modeling and compensation[J].The International Journal of Advanced Manufacturing Technology,2015,81(1):289‒305. doi:10.1007/s00170-015-7035-0