大跨度桥梁脉动风场模拟的插值算法

发布时间：2018-07-12 11:23

本文选题：风场模拟 + 大跨度桥梁　；参考：《振动与冲击》2017年07期

【摘要】：为减少谐波合成法中功率谱矩阵分解的计算量,基于双索引频率和谱矩阵特点,提出了谱解矩阵双轴插值算法和递归插值算法。两种方法均使风场模拟计算效率大幅度提高,且得到的模拟风场均与传统谐波合成法在统计意义上相符;研究了插值节点数量及分布形式对风场模拟的影响,认为在谱解矩阵的频率轴向采取前密后疏分段插值,双索引频率轴向采用均匀分布插值节点的形式,更适合于风场模拟。通过对一实际大跨度桥梁风场的模拟,验证了方法的有效性。
[Abstract]:In order to reduce the computational complexity of power spectral matrix decomposition in harmonic synthesis, biaxial interpolation algorithm and recursive interpolation algorithm for spectral solution matrix are proposed based on the characteristics of double index frequency and spectral matrix. Both methods greatly improve the efficiency of wind field simulation, and the simulated wind field is statistically consistent with the traditional harmonic synthesis method, and the influence of the number and distribution of interpolated nodes on wind field simulation is studied. It is considered that the frequency axial interpolation of spectral solution matrix is more suitable for wind field simulation, and the double index frequency axial direction adopts the form of uniform distribution interpolation node, which is more suitable for wind field simulation. The effectiveness of the method is verified by simulating the wind field of a large span bridge.
【作者单位】：湖南大学土木工程学院;湖南大学风工程与桥梁工程湖南省重点实验室;
【基金】：国家重点基础研究发展计划(2015CB057701;2015CB057702) 国家自然科学基金(51278191) 湖南省高校创新平台开放基金(13K016)
【分类号】：U441.3

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