中山大学学报自然科学版 ›› 2019, Vol. 58 ›› Issue (5): 33-38.doi: 10.13471/j.cnki.acta.snus.2019.05.005

• 论文 • 上一篇    下一篇

基于逐步优化算法的随机波浪荷载反演

叶静娴,吕中荣,汪利   

  1. 中山大学航空航天学院,广东 广州 510000
  • 收稿日期:2018-08-23 出版日期:2019-09-25 发布日期:2019-09-25
  • 通讯作者: 汪利(1988年生),男;研究方向:结构振动和数值方法研究;E-mail: wangli75@mail.sysu.edu.cn

Random wave load inversion based on recursive optimization algorithm

YE Jingxian,LU Zhongrong,WANG Li   

  1. School of Aeronautics and Astronautics, Sun Yat-sen University,Guangzhou 510000,China
  • Received:2018-08-23 Online:2019-09-25 Published:2019-09-25

摘要:

根据实测结构响应反演得到所受波浪的荷载时程,可为海洋结构的设计和健康监测提供可靠的荷载信息。因此,提出了一种基于逐步优化算法的随机波浪荷载反演方法。该方法在用Newmark-β法离散求解结构响应的基础上,针对每两个相邻时间点建立目标函数,以加速度时程为输入,逐步识别一系列时间点上的波浪荷载。由于每一个时间点上的荷载是根据上一个时间点的荷载和响应信息递归推导而来,每一步的荷载求解问题规模较小,导致整体荷载的反演效率较高。以一个二层海洋结构为算例,验证出:该方法能有效识别随机波浪荷载,且抗噪能力较强。

关键词: 随机波浪荷载;逐步优化算法, 荷载反演, 谐波合成法

Abstract:

Inverse identification of time history of wave load obtained from the measured structural response can provide a reliable load information for the design and health monitoring of marine structures. In this paper, a random wave load inversion method based on recursive optimization algorithm is proposed. This method establishes an objective function based on Newmark-β for every time step and then, the wave load is identified from the measured acceleration recursively. As is noteworthy, the identified load at every time point is recursively derived from the measured acceleration and the load at the former time point for which the involved optimization problem is at small scale, and consequently, the whole load inversion procedure is very efficient.A numerical example on a two-story ocean structure shows that the proposed method can effectively identify the random wave load and is insensitive to measurement noise.

Key words: random wave load;recursive optimization algorithm, load inversion, harmonic synthesis

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