Multiple-degree-of-freedom damping characteristics evaluation of dual halbach array eddy current damper for turbopump in cryogenic environment

IF 1.1 4区 工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC
Akira Heya, Tsuyoshi Inoue
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引用次数: 0

Abstract

Liquid hydrogen turbopumps are used in large high-performance rockets. Stable high-speed rotation is required for rocket turbopumps. The damping mechanism of the pump must suppress vibration not only in the radial direction but also in the axial direction. However, conventional damping elements using oil or rubber cannot be used due to the cryogenic temperature of liquid hydrogen. Therefore, the application of eddy current dampers to liquid hydrogen turbopumps is focused on in this paper. Although various structures of eddy current dampers have been developed, the multi-degree-of-freedom damping characteristics of dual Halbach array type eddy current dampers for liquid hydrogen turbopumps have not yet been investigated. The variation of damping characteristics with temperature has also not yet been verified. In this paper, we propose a novel dual Halbach array type eddy current damper for liquid hydrogen turbopumps. The proposed damper can generate high damping force and can be operated maintenance-free at the cryogenic temperature. The analysis results show that the damping characteristics strongly depend on temperature and that the amplitude reduction effect is greater at low temperatures. It was also found that the proposed damper has a higher damping force density than conventional dampers.
用于低温环境涡轮泵的双哈尔巴赫阵列涡流阻尼器的多自由度阻尼特性评估
液氢涡轮泵用于大型高性能火箭。火箭涡轮泵需要稳定的高速旋转。泵的阻尼机构不仅要抑制径向振动,还要抑制轴向振动。然而,由于液氢的低温,不能使用传统的油或橡胶阻尼元件。因此,本文重点研究了涡流阻尼器在液氢涡轮泵中的应用。虽然已开发出各种结构的电涡流阻尼器,但用于液氢涡轮泵的双哈尔巴赫阵列型电涡流阻尼器的多自由度阻尼特性尚未得到研究。阻尼特性随温度的变化也尚未得到验证。本文提出了一种用于液氢涡轮泵的新型双哈尔巴赫阵列式涡流阻尼器。所提出的阻尼器能产生高阻尼力,并能在低温下免维护运行。分析结果表明,阻尼特性与温度密切相关,低温下的振幅减小效果更大。研究还发现,与传统阻尼器相比,拟议的阻尼器具有更高的阻尼力密度。
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来源期刊
CiteScore
1.70
自引率
0.00%
发文量
100
审稿时长
4.6 months
期刊介绍: The aim of the International Journal of Applied Electromagnetics and Mechanics is to contribute to intersciences coupling applied electromagnetics, mechanics and materials. The journal also intends to stimulate the further development of current technology in industry. The main subjects covered by the journal are: Physics and mechanics of electromagnetic materials and devices Computational electromagnetics in materials and devices Applications of electromagnetic fields and materials The three interrelated key subjects – electromagnetics, mechanics and materials - include the following aspects: electromagnetic NDE, electromagnetic machines and devices, electromagnetic materials and structures, electromagnetic fluids, magnetoelastic effects and magnetosolid mechanics, magnetic levitations, electromagnetic propulsion, bioelectromagnetics, and inverse problems in electromagnetics. The editorial policy is to combine information and experience from both the latest high technology fields and as well as the well-established technologies within applied electromagnetics.
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