Dynamic Response Analysis of the Equivalent Water Depth Truncated Point of the Catenary Mooring Line

• Published in: China ocean engineering Vol. 31; no. 1; pp. 37 - 47
• Main Authors: Zhang, Huo-ming, Kong, Ling-bin, Guan, Wei-bing, Huang, Sai-hua, Fang, Gui-sheng
• Format: Journal Article
• Language: English
• Published: Nanjing Chinese Ocean Engineering Society 01.03.2017; Springer Nature B.V; College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China%State Key Laboratory of Satellite Ocean Environment Dynamics(Second Institute of Oceanography, SOA), Hangzhou 310012, China%Institute of Hydraulic & Environmental Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China%Mechanical and Automotive Engineering College, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
• Subjects: Actuators; Catenary; Coastal Sciences; Computer simulation; Damping; Dynamic response; Dynamics; Engineering; Equivalence; Fluid- and Aerodynamics; Frequency analysis; Frequency domain analysis; Hybrid systems; Marine & Freshwater Sciences; Methods; Model testing; Mooring; Mooring lines; Mooring systems; Numerical and Computational Physics; Oceanography; Offshore Engineering; Random waves; Real time; Response analysis; Risers; Simulation; Sine waves; Technical services; Water depth; Wave excitation; 动力响应分析; 悬链线; 截断点; 水深; 混合模型; 等效; 计算机控制; 锚泊线; truncated point; dynamic response; lumped-mass method; time domain simulation; mooring line
• ISSN: 0890-5487; 2191-8945
• DOI: 10.1007/s13344-017-0005-6

The real-time computer-controlled actuators are used to connect the truncated parts of moorings and risers in the active hybrid model testing system. This must be able to work in model-scale real time, based on feedback input from the floater motions. Thus, mooring line dynamics and damping effects are artificially simulated in real time, based on a computer-based model of the problem. In consideration of the nonlinear characteristics of the sea platform catenary mooring line, the equations of the mooring line motion are formulated by using the lumped-mass method and the dynamic response of several points on the mooring line is investigated by the time and frequency domain analysis method. The dynamic response of the representative point on the mooring line is analyzed under the condition of two different corresponding upper endpoint movements namely sine wave excitation and random wave excitation. The corresponding laws of the dynamic response between the equivalent water depth truncated points at different locations and the upper endpoint are obtained, which can provide technical support for further study of the active hybrid model test.