为长期保持表面精度而测定网状反射天线的防坍塌预拉力

IF 4.4 2区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers & Structures Pub Date : 2024-06-29 DOI:10.1016/j.compstruc.2024.107460
Jun Zhang , Baiyan He , Rui Nie , Guobiao Wang , Yesen Fan
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引用次数: 0

摘要

在轨服役期间,网状反射天线不可避免地要承受长期的蠕变行为,导致材料特性发生变化和拉索张力损失,从而降低结构刚度和表面精度。预拉力设计对网状反射天线实现高表面精度起着重要作用,不同的预拉力水平也会影响天线在时间维度上的蠕变行为,可积极利用预拉力来提高天线表面精度的稳定性。本文提出了一种网格反射天线的抗蠕变预拉力确定方法,以提高表面精度的稳定性。本文采用离散时域蠕变模型来描述电缆蠕变行为。利用力密度法建立了网格反射天线的时间相关非线性平衡方程。推导出与时间相关的切线刚度矩阵,并采用牛顿-拉斐森方法求解非线性平衡方程,为分析离散时域中的天线蠕变现象提供了有效途径。以最小化时变表面误差的长期峰值为目标,生成并优化了预拉伸方案。最后,这种方法被有效地应用于 30 个单元的网格反射天线,其可行性和有效性得到了验证。
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Anti-creep pretension determination of a mesh reflector antenna for long term surface accuracy retention

During the in-orbit service, mesh reflector antennas inevitably withstand the long-term creep behavior, resulting in changes in material properties and loss of cable tensions, thus decreasing the structural stiffness and surface accuracy. Pretension design plays an important role for mesh reflector antennas in achieving high surface accuracy, and different levels of pretension also affect the antenna’s creep behavior in the time dimension, which can be actively utilized to improve stability of the antenna surface accuracy. In this paper, we present an anti-creep pretension determination method for mesh reflector antennas to improve the surface accuracy stability. The creep model in the discretized time domain is adopted to describe the cable creep behavior. The time-related nonlinear equilibrium equation of the mesh reflector antenna is established with the force density method. The time-related tangent stiffness matrix is derived and adopted to solve the nonlinear equilibrium equation by the Newton-Raphson method, providing an effective way to analyze the antenna creep phenomenon in the discretized time domain. Aiming to minimize the long-term peak value of the time-variant surface error, the pretension schemes are generated and optimized. Finally, this approach is effectively applied to a thirty-unit mesh reflector antenna and its feasibility and effectiveness are verified.

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来源期刊
Computers & Structures
Computers & Structures 工程技术-工程:土木
CiteScore
8.80
自引率
6.40%
发文量
122
审稿时长
33 days
期刊介绍: Computers & Structures publishes advances in the development and use of computational methods for the solution of problems in engineering and the sciences. The range of appropriate contributions is wide, and includes papers on establishing appropriate mathematical models and their numerical solution in all areas of mechanics. The journal also includes articles that present a substantial review of a field in the topics of the journal.
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