面向船体结构动冰载荷监测的线性形函数识别方法研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (14) : 226-232.

论文

孔帅1，田于逵1，崔洪宇2，季顺迎2

作者信息 +

Identification method using the combination of linear shape functions for the monitoring of dynamic ice load on ship structures

KONG Shuai1, TIAN Yukui1, CUI Hongyu2, JI Shunying2

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文章历史 +

摘要

船体结构冰载荷监测系统中的载荷识别算法是对船舶在冰区安全运行进行实时评估的关键环节，而常用的影响系数矩阵法尚未考虑冰载荷的动力效应。在时域内将动冰载荷离散为诸多时间元，在每个时间元内利用线性形函数的组合形式逼近构造动冰载荷；通过结构的动力响应分析得到形函数的响应矩阵，并以此建立船体结构冰载荷识别的正问题。利用共轭梯度最小二乘迭代型正则化算法和终止迭代准则对冰载荷识别问题中的不适定性进行控制。本文数值算例和试验验证均表明该冰载荷识别模型具有良好的识别精度、求解速度及稳定性。
关键词：船体冰载荷；载荷识别；线性形函数；共轭梯度最小二乘法

Abstract

Load identification algorithm is the key to the real-time evaluation of safe operation of ship structures in the ice load monitoring system. However, the dynamic effect of ice load has not been considered yet in the Influence Coefficient Matrix method (ICM), which is typically adopted in the ice load identification. The dynamic ice load is discretized into multiple time elements in the time domain and the combination form of linear shape functions are used to construct the dynamic ice load approximately in each time element. The response matrix of the shape functions is calculated by structural dynamic response analysis and the forward problem of ice load identification is established. The iterative regularization method using conjugate gradient least squares and stopping criteria for iteration selection are adopted to control the ill-posed problem of identification problem. In this paper, both the numerical examples and experimental verification prove that the ice load identification model owe the advantages in aspect of identification precision, solution speed, and stability.
Key words: ice load of ship; load identification; linear shape function; Conjugate Gradient Least Squares

导出引用

孔帅1，田于逵1，崔洪宇2，季顺迎2. 面向船体结构动冰载荷监测的线性形函数识别方法研究[J]. 振动与冲击, 2022, 41(14): 226-232

KONG Shuai1, TIAN Yukui1, CUI Hongyu2, JI Shunying2. Identification method using the combination of linear shape functions for the monitoring of dynamic ice load on ship structures[J]. Journal of Vibration and Shock, 2022, 41(14): 226-232

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