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Dispersion-minimizing quadrature rules for C-1 quadratic isogeometric analysis

机译:用于C-1二次等几何分析的色散最小正交规则

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We develop quadrature rules for the isogeometric analysis of wave propagation and structural vibrations that minimize the discrete dispersion error of the approximation. The rules are optimal in the sense that they only require two quadrature points per element to minimize the dispersion error (Barton et al., 2017 [ 1]), and they are equivalent to the optimized blending rules we recently described. Our approach further simplifies the numerical integration: instead of blending two three-point standard quadrature rules, we construct directly a single two-point quadrature rule that reduces the dispersion error to the same order for uniform meshes with periodic boundary conditions. Also, we present a 2.5-point rule for both uniform and non-uniform meshes with arbitrary boundary conditions. Consequently, we reduce the computational cost by using the proposed quadrature rules. Various numerical examples demonstrate the performance of these quadrature rules. (C) 2017 Elsevier B.V. All rights reserved.
机译:我们为波的传播和结构振动的等几何分析开发了正交规则,该规则使近似值的离散色散误差最小。在每个元素仅需要两个正交点以最小化色散误差的意义上,这些规则是最佳的(Barton等人,2017 [1]),并且它们等效于我们最近描述的优化混合规则。我们的方法进一步简化了数值积分:我们没有直接混合两个三点标准正交规则,而是直接构造了一个单一的两点正交规则,该规则将具有周期性边界条件的均匀网格的色散误差降低到相同的阶数。同样,我们为具有任意边界条件的均匀和非均匀网格提供了2.5点规则。因此,我们通过使用提出的正交规则降低了计算成本。各种数值示例说明了这些正交规则的性能。 (C)2017 Elsevier B.V.保留所有权利。

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