Owing to manufacturing errors,the surface accuracy of a mesh reflector antenna decreases after fabrication compared with the design results;thus,it is necessary to adjust the surface before launching.The adjustment is...Owing to manufacturing errors,the surface accuracy of a mesh reflector antenna decreases after fabrication compared with the design results;thus,it is necessary to adjust the surface before launching.The adjustment is faced with 3 problems:First,the prototype physical model is unknown;i.e.,the physical model with manufacturing errors is different from the mathematical model.Second,the adjustment target is difficult to determine;i.e.,the antenna is adjusted on ground but works in space;there is a problem of an inconsistent adjustment target due to the different environments.Third,the efficiency is low;i.e.,the larger the aperture is,the more complex the structure is and the longer the adjustment time is;the efficiency restricts the antenna development cycle.To address these problems,a surface adjustment method considering the space–ground consistency of the adjustment target is proposed in this study.First,the characteristics of the cable-net structure were analyzed,and a method to modify the mathematical model by measuring part of the cable force of the physical model is proposed,which reduces the difference between 2 models.Second,based on the sensitivity matrix,an adjustment method for selecting key cables is proposed.Third,the influence of gravity and temperature on the surface was analyzed,and a preadjustment method considering the space–ground consistency of the adjustment target is proposed.Finally,simulation and prototype experiments were conducted to verify the accuracy and efficiency of the proposed methods,which can effectively support the ground preadjustment of a large-aperture mesh reflector antenna and improve the surface accuracy on orbit.展开更多
基金supported by the National Natural Science Foundation of China(Nos.U2241247 and 52475281)the Civil Aerospace Technology Research Project(D030206)+2 种基金the Open Project of Yunnan Precious Metals Laboratory Co.,Ltd(YPML-2023050244)the academician expert workstation of Yunnan(No.202305AF150170)the Fundamental Research Funds for the Central Universities(No.QTZX24002).
文摘Owing to manufacturing errors,the surface accuracy of a mesh reflector antenna decreases after fabrication compared with the design results;thus,it is necessary to adjust the surface before launching.The adjustment is faced with 3 problems:First,the prototype physical model is unknown;i.e.,the physical model with manufacturing errors is different from the mathematical model.Second,the adjustment target is difficult to determine;i.e.,the antenna is adjusted on ground but works in space;there is a problem of an inconsistent adjustment target due to the different environments.Third,the efficiency is low;i.e.,the larger the aperture is,the more complex the structure is and the longer the adjustment time is;the efficiency restricts the antenna development cycle.To address these problems,a surface adjustment method considering the space–ground consistency of the adjustment target is proposed in this study.First,the characteristics of the cable-net structure were analyzed,and a method to modify the mathematical model by measuring part of the cable force of the physical model is proposed,which reduces the difference between 2 models.Second,based on the sensitivity matrix,an adjustment method for selecting key cables is proposed.Third,the influence of gravity and temperature on the surface was analyzed,and a preadjustment method considering the space–ground consistency of the adjustment target is proposed.Finally,simulation and prototype experiments were conducted to verify the accuracy and efficiency of the proposed methods,which can effectively support the ground preadjustment of a large-aperture mesh reflector antenna and improve the surface accuracy on orbit.
