Associated with a project of the planned xuefengshan tunnel with 7.6 km long during the construction of shaoyang to huaihua expressway in hunan province of shanghai to ruili national trunk highway, this paper firstly makes an introduction of the frequently-used analysis & computation methods for tunnel supporting structure . then, based on the analysis of the basic theory about the interaction mechanism of surrounding rock and support structure, a spatial computation model is made, a coupling numerical computation method with 3-d elastic-plastic finite element and infinite element is proposed, and a comprehensive analysis has been made to the effects of the overall stability and safety of the surrounding rocks of different characteristics, different classes and under different construction methods . and thus the problem of 3-d infinite region to which applying the general finite ca n't do has been resolved 6公里的雪峰山隧道工程,首先介绍了隧道支护结构的常用分析计算方法;然后通过对隧道施工过程中,洞室稳定性与支护结构相互作用机理的深入分析,建立了隧道施工过程的空间计算模型,提出了采用三维弹塑性有限元-无限元耦合的数值计算方法,综合分析了隧道在不同围岩特性和围岩类别条件下,以及不同施工开挖方案等对隧道围岩整体稳定和安全性的影响,从而解决了通用有限元方法难以解决的隧道三维无限域问题;其可充分发挥有限元法在分析非线性方面的有效性和成熟性,以及无限元法在分析处理无限域和半无限域方面的精确性和简便性,为隧道施工过程中围岩的稳定性分析开辟了一条新的途径。
For high voltage sf6 circuit breaker with multi-dielectric media and complex structure, it's the key for solving the problem by establishing suitable mathematical model, applying the numerical computation methods with high precision and efficiency, in this thesis, based on the analysis of characteristics of common numerical computation methods and aiming at the real structure of the sf6 circuit breaker products, conventional charge simulation method has been applied to analyze the 3d electric field 对于含有多重介质、复杂结构的高压sf_6断路器,通过构造合理的数学模型,研究高精度、高求解效率的电场数值求解方法是解决问题的关键。本文针对高压sf_6断路器的实际产品结构,采用传统模拟电荷法进行断路器3d电场数值分析。
For high voltage sf6 circuit breaker with multi-dielectric media and complex structure, it's the key for solving the problem by establishing suitable mathematical model, applying the numerical computation methods with high precision and efficiency, in this thesis, based on the analysis of characteristics of common numerical computation methods and aiming at the real structure of the sf6 circuit breaker products, conventional charge simulation method has been applied to analyze the 3d electric field 对于含有多重介质、复杂结构的高压sf_6断路器,通过构造合理的数学模型,研究高精度、高求解效率的电场数值求解方法是解决问题的关键。本文针对高压sf_6断路器的实际产品结构,采用传统模拟电荷法进行断路器3d电场数值分析。
Based on large number of the domestic and overseas references, this thesis concludes the research contributions of many experts and scholars, the current hot problems, combining the developing demand for high voltage sf6 circuit breaker, some key technical problems have been studied . 3d electric field simulation of high voltage sf6 circuit breaker and numerical computation method 本文在阅读了大量国内外参考文献资料的基础上,归纳总结了国内外高压sf_6断路器的众多专家学者的研究成果,从高压sf_6断路器的应用现状和当前研究的热点、难点问题出发,结合国内高压sf_6断路器的发展需求,进行了部分关键技术问题的研究。
In addition to pic method, the numerical computation method is used as a compensation for the study of the characteristics of electron beam . the two methods are used separately to attain the trajectory of axially-emitted electron beam in diode region and drift region, and the trajectory of radially-emitted electron beam with axial, azimuthal, as well as compounded axial and azimuthal magnetic field . three two-dimensional codes and two three-dimensional codes have been made out to compute the trajectories 本文特点之一就是采用粒子模拟和数值计算相结合的方法进行仿真计算,分别得到了轴向发射条件下电子在二极管区域和漂移区的轨迹,径向发射条件下电子在角向磁场、轴向磁场、角向和轴向复合磁场中电子的运动轨迹,分别编制了三个二维电子轨迹计算程序和两个三维电子轨迹计算程序,最后将粒子模拟和数值计算得到的结果进行了对比,得到了较为满意的结果。
In order to properly simulate the interaction between two kinds of material, the numerical computation method of coupling finite-infinite-interface element is applied to the strength analysis of above interaction, and the comparison between the numerical computation results and the model test results is made 为了合理地模拟2种不同材料之间的相互作用,将有限元、无限元、接触单元耦合的数值计算方法引入到桶形基础与土壤相互作用的强度分析中,并将用该方法得到的计算结果与模型试验比较。