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题名	光纤Bragg光栅低温传感特性与高场超导磁体应力/应变有限元模型的研究; 光纤Bragg光栅低温传感特性与高场超导磁体应力/应变有限元模型的研究
作者	1邓凡平,电工研究所
学位类别	硕士
答辩日期	2007-06-02
授予单位	中国科学院电工研究所
导师	1王秋良,电工研究所
关键词	光纤布拉格光栅 低温 超导磁体 弹塑性 应力 应变 FBG, cryogenic, superconducting magnet, elasto-plastic, strain, stress
其他题名	光纤Bragg光栅低温传感特性与高场超导磁体应力/应变有限元模型的研究
中文摘要	本课题按照国家自然科学基金资助项目的安排，着重从两个方面开展相关研究：一是研究光纤Bragg光栅在低温环境中的传感特性，包括温度传感特性和应变传感特性；二是研究在商用有限元软件ANSYS中如何为高场超导磁体建立二维弹性和二维弹塑性模型。 本文首先介绍了光纤Bragg光栅的传感原理，然后分别研究了77K到286K范围内光纤Bragg光栅的温度传感性能以及77K下光纤Bragg光栅的应变传感性能。总体说来，在低温环境中，光纤Bragg光栅的传感性能会变坏，尤其是应变传感时，低温环境带来的多峰现象使其传感性能变得尤其恶劣。但在研究过程中，通过建立多种技术手段有效改善了光纤Bragg光栅的传感性能。本文还介绍了自行研制的光纤Bragg光栅应变定标装置，并利用该装置为两根光纤进行了应变定标。另外本文重点介绍了液氦环境中对光纤Bragg光栅传感特性进行探索性研究的情况，并分析了4.2K到296K范围内光纤Bragg光栅的温度传感特性，还总结了光纤Bragg光栅液氦实验的特点并提出一些改进建议。 本文讨论了建立高场超导磁体的2维弹性模型和2维弹塑性模型的问题。基于ANSYS仿真平台，确立了耦合场计算的方法和仿真流程。对于弹性模型，为一个实际的1MJ超导储能磁体建立了包括支持装置在内的各项异性材料的详细模型，并计算了该磁体的应力/应变；对于弹塑性模型，首先结合超导磁体的特点介绍了弹塑性力学相关知识，然后为一个23T螺管磁体建立了弹塑性模型并分析了计算结果。 Based on the arrangement of a NSF project, this paper carries out the research work on two parts: temperature sensing and strain sensing characteristics of Fiber Bragg Gratings(FBG) in cryogenic environment; two dimensional elastic model and elasto-plastic model for high field superconducting magnet by using commercial finite element software ANSYS. First, the working principle of FBG is introduced. Then the measurement of the temperature sensing ability from 77K to 286K and strain sensing ability at 77K of FBG are carried out. Generally speaking, the sensing performance of FBG becomes bad and the multiple peaks phenomena takes place in the cryogenic environment especially for strain measurement. However, effectively technologies are successfully developed to improve the sensing performance of FBG sensors. Self-designed equipment which could be used to measure strain sensitivity of FBG at cryogenic temperature is introduced. Two FBGs are measured with this equipment. Moreover, an experiment in liquid Helium environment to study the FBG’s sensing characteristics is carried out and its temperature sensing ability from 4.2K to 296K is studied. The features of experiments for FBGs at liquid Helium environment are summarized while several useful suggestions are made. Two dimensional elastic and elasto-plastic models for the magnets are created for numerical simulation. Based on the ANSYS software, the coupling field calculation for simulation program is developed in this paper for an actual 1MJ superconducting magnetic energy storage (SMES) magnet. The strain and stress of this magnet including supporting components is calculated; for elasto-plastic model, the relative knowledge of elasto-plastic mechanics combined with features of superconducting magnets is first introduced, then the elasto-plastic model for a 23T solenoid superconducting magnet are built and its strain and stress is simulated.
语种	中文
公开日期	2010-10-18
页码	80
分类号	TM1
内容类型	学位论文
源URL	[http://ir.iee.ac.cn/handle/311042/7037]
专题	电工研究所_其他部门_其他部门_硕士学位论文
推荐引用方式 GB/T 7714	1邓凡平,电工研究所. 光纤Bragg光栅低温传感特性与高场超导磁体应力/应变有限元模型的研究, 光纤Bragg光栅低温传感特性与高场超导磁体应力/应变有限元模型的研究[D]. 中国科学院电工研究所. 2007.

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