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摘要:
同几何分析(isogeometric analysis) 是当前工程分析的一种发展趋势, 有可能对计算机辅助工程(CAE) 产生重大影响. 同几何分析的思想是采用计算机辅助设计(CAD) 的几何语言, 如NURBS(non-uniform rational B-spline) 几何替代拉格朗日插值作为分析计算的基础. 这种看似简单的几何语言变化, 消除了困扰CAE 多年 的瓶颈问题, 开启了一条紧密联系分析、设计和优化的新途径. 本文论述了同几何分析的产生背景、理论、优 点及其在各个领域的应用. 系统总结了同几何分析在NURBS, T 样条基函数构建, 非结构化网格构建, 有效 积分方法, 曲面修剪技术, 网格细化等基础理论方面的进展, 以及在板壳问题、大变形问题、流固耦合、结构优 化、接触问题、生物力学、温度场和电磁场等领域的应用, 展示了同几何分析相对于标准多项式插值有限元法 的优势.
Abstract:Isogeometric analysis (IGA) is a current trend in engineering analysis that is likely to leave a significantly impact on Computer-Aided Engineering (CAE). The basic idea of IGA is to utilize CAD geometry to facilitate analysis. This seemingly simple change of geometric language eliminates many bottle-neck issues that plagued CAE for years, and opens a pathway for a tighter integration of design, analysis, and optimization. In this review paper, the background, theory, advantages, and applications of isogeometric analysis are discussed. Topics of algorithmic development, including NURBS bases, T-spline bases, unstructured meshes, efficient quadrature methods, trimmed surface technologies, refinements and so on are reviewed. Recent advances of IGA in shell problems, large deformation, fluid-structure interaction, structural optimization, contact problems, biomechanics, thermal analysis, and electromagnetics are also summarized.
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