Modeling and Analysis of Offshore Gangway under Dynamic Load

The safety transfer on the sea is threatened by wind, wave and surge loads. An offshore gangway ensures smooth and safe transfer by compensating the ship’s motion. In a mixed offshore gangway system, the transfer gangway is a huge asymmetric load on top of the stable platform, and the displacement o...

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Bibliographic Details
Published in:Journal of marine science and engineering 2023-01, Vol.11 (1), p.77
Main Authors: Qiu, Jianchao, Qiu, Weihan, Niu, Anqi, Han, Guangdong, Wang, Shenghai, Sun, Yuqing
Format: Article
Language:English
Subjects:
Center of gravity
Chain drives
Chains
dynamic load
Dynamic loads
dynamic model
Dynamic models
Euler-Lagrange equation
Gravity
joint simulation
Lagrange equation
Load
Mathematical models
mixed offshore gangway
Offshore
Simulation
Static loads
Traction force
virtual work principle
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Summary:The safety transfer on the sea is threatened by wind, wave and surge loads. An offshore gangway ensures smooth and safe transfer by compensating the ship’s motion. In a mixed offshore gangway system, the transfer gangway is a huge asymmetric load on top of the stable platform, and the displacement of its center of gravity causes it to exert a large dynamic load on the stable platform. A dynamic model of the offshore gangway under dynamic load is established in this work. The Lagrange equation is used to establish the dynamic model of the transfer gangway; the equivalent center of gravity method is used to visualize its dynamic load. The dynamic of the stable platform is modeled by the virtual work principle. Finally, the accuracy of the mathematical model was verified by the joint simulation. Simulation results indicate that under the influence of dynamic load, the tractive force of the second drive support chain is 2–3 times greater than the tractive force of the first and third drive support chains. With the same excitation, the tractive force of the second drive support chain is 2.83 times higher than that under the static load.
ISSN:2077-1312
2077-1312
DOI:10.3390/jmse11010077