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1. chinaXiv:201710.00095 [pdf]

Mechanical design and error prediction of a flexible manipulator system applied in nuclear fusion environment.pdf

史善爽
分类: 核科学技术 >> 核聚变工程技术

Purpose – The purpose of this paper is to develop a serial redundant manipulator system applied in nuclear fusion environment. It will allow remote inspection and maintenance of plasma facing components in the vacuum vessel of fusion device without breaking down the ultra-high vacuum condition during physical experiments. Design/methodology/approach – Firstly, considering the dynamic sealing of actuators to avoid polluting the vacuum condition inside fusion reactor, the mechanical design of robot system has been introduced. The redundant manipulator system has 11 degree of freedoms in total with an identical modular design. Besides, to improve the position accuracy, an error prediction model has been built based on the experimental study and back-propagation neural network (BPNN) algorithm. Findings – Currently, the implementation of the manipulator system has been successfully finished in both atmosphere and vacuum condition. The validation of BPNN model shown an acceptable prediction accuracy (94%~98%) compared with the real measurement. Originality/value – This is a special robot system which is practically used in a nuclear fusion device in China. Its design, mechanism and error prediction strategy have great reference values to the similar robots in vacuum and temperature applications.

提交时间: 2017-10-27 点击量23, 下载量17

2. chinaXiv:201710.00096 [pdf]

Solid lubrication with MoS2-Ti-C films for high-vacuum applications in a nuclear fusion device.pdf

史善爽
分类: 核科学技术 >> 核聚变工程技术

Structured Abstract: Purpose: EAST is a tokamak fusion device running in ultra-high vacuum condition. To avoid polluting the inner vessel environment, solid lubrication has been applied on the surface of bearings and gears which exposed to the vacuum. Design/methodology/approach: anti-friction MoS2 coatings penetrating with different atoms have been developed by multi-target magnetron sputtering deposition technique. This paper presents the comparative testing of tribological properties for three kinds of MoS2-based coating layers. Findings: based on the test results, MoS2-Ti-C coating films are supposed to be the final selection due to the better performance of friction coefficient and lubrication longevity. Originality/value: finally, the detailed information has been characterized for the hybrid coatings which can provide some references for applications of solid lubrications in similar condition of high vacuum and temperature.

提交时间: 2017-10-27 点击量22, 下载量14

3. chinaXiv:201708.00289 [pdf]

核聚变堆面向等离子体钨基材料辐照损伤与氢氦效应机理研究进展

吴学邦
分类: 核科学技术 >> 核材料与工艺技术

钨基材料以其高熔点、高导热率、良好的抗中子辐照和抗溅射腐蚀等优异性能,被视为未来核聚变装置中最有前景的面向等离子材料。在聚变服役环境下,14MeV的高能中子以及低能氢/氦粒子流对钨基材料造成严重的辐照损伤。研究材料的辐照损伤与氢氦效应机理对揭示辐照引起材料微观结构与性能的变化以及探索开发新型抗辐照材料具有重要的意义。近年来,随着计算模拟技术的发展,多尺度模拟方法在聚变堆关键材料辐照损伤与氢氦效应机理研究方面有着广泛的应用。本文主要结合作者近几年的研究实践,介绍了纳米晶钨/铁的抗辐照损伤机理、钨中氢滞留机制、合金元素强化界面机制、嬗变元素偏聚及其对氦泡形成机制的影响。通过多尺度模拟方法来获取材料在辐照环境下的不同时间/空间层次的结构演化信息,从而揭示材料的辐照损伤与氢氦效应机理,为聚变堆面向等离子体材料的优化设计与性能调控提供理论基础。

提交时间: 2017-08-23 点击量78, 下载量60

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