An experimental study of mooring line damping in shallow water

Wen Yang Hsu, Tzu Ching Chuang, Ray-Yeng Yang, Wei Ting Hsu, Krish P. Thiagarajan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


The aim of this paper is to establish a simple approach toexperimentally study the mooring line damping in shallow water.Experimental measurements were conducted in a wave basin ata scale of 1:50, which corresponds to a full scale of 28 m waterdepth. A chain made by stainless steel was used and the tensionforce at the fairlead was measured by tension gauges. Moreover,the mooring line geometry and velocity were computed fromimage processing technique. Series of horizontal motions atfairlead were driven from a programmable wavemaker. Regularsurges with different frequency and pretensions were tested inthis system to investigate the quasi-static and dynamic behaviorsof the mooring chain. In the quasi-static test, mooring line keepsa typical catenary shape and its indicator diagram exhibits asmooth-closed curve. In the dynamic test, the mooring line isfully lifted from the seabed and it cyclically goes through thestage of semi-taut and fully taut. We successfully reproduced asnap event in the laboratory scale and the resulting mooring linedamping can considerably increase in this manner. Themechanism of snap load is investigated by the measured tension,surge and mooring line velocities.

Original languageEnglish
Title of host publicationHonoring Symposium for Professor Carlos Guedes Soares on Marine Technology and Ocean Engineering
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791851326
Publication statusPublished - 2018 Jan 1
EventASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2018 - Madrid, Spain
Duration: 2018 Jun 172018 Jun 22

Publication series

NameProceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE


OtherASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2018

All Science Journal Classification (ASJC) codes

  • Ocean Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering


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