A two-step mode shape expansion method for offshore jacket structures with physical meaningful modelling errors
A two-step mode shape expansion method for offshore jacket structures with physical meaningful modelling errors
复制标题
具有物理意义建模误差的海上导管架结构的两步振型展开方法
DOI：
10.1016/j.oceaneng.2013.01.030
复制
发表时间：
2013-05
影响因子：
5
通讯作者：
Li, Huajun
中科院分区：
文献类型：
--
作者：
Liu, Fushun;Liu, Fushun;Li, Huajun;Li, Huajun
提出了海洋导管架结构的两步振型展开方法，该方法考虑了有限元模型和试验结构之间的建模误差，并在有物理意义的区间内进行了估计。在第一步中，通过忽略这些建模误差来修正对模式修正因子的初始猜测；然后在第二步中，通过引入一系列模型修正因子来考虑这些建模误差，这些模型修正因子由约束线性最小二乘技术赋予物理意义。因此，可以利用改进的收敛性能来扩展测量的振型，并在物理有意义的区间内估计模型修正因子。首先以一个五层框架结构为例研究了该方法的性能，结果表明，该方法能够可靠地扩展实测振型，改善了收敛性能，并且可以对建模误差进行有物理意义的估计。此外，在钢结构三维平台上对该方法的性能进行了研究，实验结果表明，当基于有限元模型的振型值对振型修正因子施加参考约束时，该方法可以适当地扩展振型，并且可以在期望的物理意义区间内估计建模修正因子。
A two-step mode shape expansion methodology is proposed for offshore jacket structures when modelling errors between the finite element model and the tested structure are taken into account and estimated in a physical meaningful interval. In the first step, initial guess on mode-correction factors is refined by neglecting these modelling errors; then in the second step, these modelling errors are considered by introducing a series of model-correction factors, which are assigned with physical meanings by using constrained linear least squares technique. Therefore, measured mode shapes can be expanded with an improved convergence performance, and the model-correction factors are estimated within a physical meaningful interval. A three-dimensional five-storey frame structure is firstly employed to investigate the performance of the proposed method, and results show that the approach can reliably expand measured mode shapes with improved convergence performance, and the modelling errors can be estimated with physical meaning. Furthermore, the performance of the approach is also studied by a steel three-dimensional platform, and experimental results demonstrate that mode shapes can be expanded properly when a reference constraint on mode-corrections factors is used based on the mode shape values from the FEM model, and can estimate modelling-correction factors in an expected physical meaningful interval.
登录
查看更多内容
使用混合矢量对海上导管架结构进行快速直接模式形状扩展
影响因子：
5
作者：
Fushun Liu;Huajun Li
通讯作者：
Huajun Li
DOI：
10.1016/j.sysconle.2011.10.016
发表时间：
2012
期刊：
Syst. Control. Lett.
影响因子：
--
作者：
Wen Mi;Tao Qian;Feng Wan
通讯作者：
Wen Mi;Tao Qian;Feng Wan
DOI：
10.1504/ijaac.2009.026780
发表时间：
2009-06
期刊：
Int. J. Autom. Control.
影响因子：
--
作者：
Y. Chetouani
通讯作者：
Y. Chetouani
影响因子：
4.7
作者：
Huajun Li;H. Fang;Sau-Lon James Hu
通讯作者：
Huajun Li;H. Fang;Sau-Lon James Hu
影响因子：
5
作者：
O. Alsmadi;Z. Abo-Hammour;A. Al-Smadi
通讯作者：
O. Alsmadi;Z. Abo-Hammour;A. Al-Smadi