A study of Kevlar suspension system in ADR for future mission

IF 1.8 3区 工程技术 Q3 PHYSICS, APPLIED
Yian Lu , Jun Shen , Ya'nan Zhao
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引用次数: 0

Abstract

The use of the ADR to provide a sub-Kelvin temperature environment is required for many space missions. The mechanical design of the ADR, including the use of Kevlar to ensure proper suspension of the salt pill, must minimize thermal conductivity between components while optimizing structural capability. Heat leakage reduction and vibration resistance have different focuses when determining the suspension system strategy and must be compromised. A dimensionless parameter φ representing the slenderness of the suspension is developed to quantify both heat leakage and vibration characteristics. At constant φ, the diameter of the Kevlar cords has the greatest influence on vibration, followed by Kevlar cords’ length and then their number. As φ increases, although the reduction in heat leakage becomes less pronounced, the vibration response remains essentially linearly increasing. Therefore, designing the suspension according to this principle enables optimal stability after conforming to the maximum allowable heat leakage dictated by ADR's thermal design constraints. Also, research revealed that increasing preload from 10 N to 110 N has a negligible impact on vibration damping, benefiting from the comparatively superior axial stiffness of Kevlar. Therefore, it is sufficient to apply a certain amount of preload at rest to ensure that the salt pills remain fixed.

为未来任务设计的 ADR 凯夫拉悬挂系统研究
许多太空任务都需要使用 ADR 提供亚开尔文温度环境。ADR 的机械设计(包括使用凯夫拉尔纤维来确保盐丸的正常悬浮)必须在优化结构能力的同时,最大限度地减少部件之间的热传导。在确定悬挂系统策略时,减少热泄漏和抗振性各有侧重,必须兼顾。我们开发了一个代表悬挂系统细长度的无量纲参数φ,用于量化热泄漏和振动特性。在 φ 不变的情况下,Kevlar 纤维绳的直径对振动的影响最大,其次是 Kevlar 纤维绳的长度,再次是其数量。随着 φ 的增大,虽然热泄漏的减少变得不那么明显,但振动响应基本上保持线性增长。因此,根据这一原理设计悬挂装置,可在符合 ADR 热设计限制所规定的最大允许热泄漏量的情况下实现最佳稳定性。此外,研究还发现,将预紧力从 10 N 增加到 110 N 对减震的影响微乎其微,这得益于 Kevlar 相对较高的轴向刚度。因此,只需在静止时施加一定量的预紧力,即可确保盐丸保持固定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Cryogenics
Cryogenics 物理-热力学
CiteScore
3.80
自引率
9.50%
发文量
0
审稿时长
2.1 months
期刊介绍: Cryogenics is the world''s leading journal focusing on all aspects of cryoengineering and cryogenics. Papers published in Cryogenics cover a wide variety of subjects in low temperature engineering and research. Among the areas covered are: - Applications of superconductivity: magnets, electronics, devices - Superconductors and their properties - Properties of materials: metals, alloys, composites, polymers, insulations - New applications of cryogenic technology to processes, devices, machinery - Refrigeration and liquefaction technology - Thermodynamics - Fluid properties and fluid mechanics - Heat transfer - Thermometry and measurement science - Cryogenics in medicine - Cryoelectronics
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