海底电力电缆轴向刚度预测的实验与理论研究

Woongshik Nam, K. Chae, Young-Cheon Lim
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引用次数: 0

摘要

海底电力电缆在制造、运输和安装过程中,会受到各种环境和机械因素引起的外部载荷。因此,结构强度的预测是必不可少的。本文对海底电力电缆的轴向刚度进行了实验和理论分析。采用10 MN液压致动器对6.5 m三芯交流阵列间海底电力电缆进行了单轴拉伸试验。此外,还测量了合力作为位移的函数。采用Witz和Tan(1992)提出的理论模型对试件轴向刚度进行数值预测。在理论分析中,采用牛顿-拉夫森法求解控制方程。轴向刚度的实验结果与理论结果的比较显示了令人满意的一致性。此外,预测的轴向刚度是线性的,尽管海底电力电缆的非线性几何结构或控制方程是非线性的。验证了海底电力电缆轴向刚度预测的实验和理论框架的可行性。然而,需要进一步的数值研究,使用有限元方法来验证框架是公认的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental and Theoretical Study on the Prediction of Axial Stiffness of Subsea Power Cables
: Subsea power cables are subjected to various external loads induced by environmental and mechanical factors during manufacturing, shipping, and installation. Therefore, the prediction of the structural strength is essential. In this study, experimental and theoretical analyses were performed to investigate the axial stiffness of subsea power cables. A uniaxial tensile test of a 6.5 m three-core AC inter-array subsea power cable was carried out using a 10 MN hydraulic actuator. In addition, the resultant force was measured as a function of displacement. The theoretical model proposed by Witz and Tan (1992) was used to numerically predict the axial stiffness of the specimen. The Newton – Raphson method was employed to solve the governing equation in the theoretical analysis. A comparison of the experimental and theoretical results for axial stiffness revealed satisfactory agreement. In addition, the predicted axial stiffness was linear notwithstanding the nonlinear geometry of the subsea power cable or the nonlinearity of the governing equation. The feasibility of both experimental and theoretical framework for predicting the axial stiffness of subsea power cables was validated. Nevertheless, the need for further numerical study using the finite element method to validate the framework is acknowledged.
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