Nonlinear Dynamic Analysis of Direct Acting Tensioner of an Offshore Floating Platform

Zong-Yu Chang; Xin Duan; Zhong-Qiang Zheng; Lin Zhao; Yu-Hu Yang; Xian-Yi Zhou; Peng Zhu; Jing-Wen He

doi:10.46604/aiti.2020.4529

Authors

Zong-Yu Chang College of Engineering, Ocean University of China, Qingdao, China
Xin Duan College of Engineering, Ocean University of China, Qingdao, China
Zhong-Qiang Zheng College of Engineering, Ocean University of China, Qingdao, China
Lin Zhao College of Engineering, Ocean University of China, Qingdao, China
Yu-Hu Yang Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin, China
Xian-Yi Zhou College of Engineering, Ocean University of China, Qingdao, China
Peng Zhu College of Engineering, Ocean University of China, Qingdao, China
Jing-Wen He College of Engineering, Ocean University of China, Qingdao, China

DOI:

https://doi.org/10.46604/aiti.2020.4529

Keywords:

direct acting tensioner, nonlinear dynamic model, accumulator

Abstract

The offshore floating platform is the key equipment in offshore and gas development. The significant heave motions occur with the excitation of wind and waves, which will affect the safety of a riser system. A direct acting tensioner can be applied to reduce the effects on the riser system and be widely used on different kinds of offshore platforms. Based on the analysis of the structure and working principle of a direct acting tensioner (DAT), the nonlinear dynamic performance of DAT riser system was studied. Additionally, the dynamic model of the DAT riser system is established and the dynamic response was gained by the numerical integration method. The differences of dynamic responses were compared between a linear model and a nonlinear model. The response on different side of the equilibrium position is asymmetric because of the nonlinear stiffness of DAT. The results can be helpful for the design of DAT.

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