The Design, Production, Verification, and Calibration of an Elastic Model of a Catamaran for Hydroelastic Experiments

Anabel Keser, Michiel Verdult, Harleigh Seyffert, Apostolos Grammatikopoulos*

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review


Catamarans are popular in the offshore sector as they combine good transverse stability and ample deck space with low wave resistance. However, their slender hull shape results in low restoring qualities in heave and pitch motions. The large motions in rough weather can often result in water impacting the underside of the deck connecting the two hulls, a phenomenon called wet deck slamming. The impulse excitation from wet deck slamming can then produce a transient hydroelastic response of the structure called whipping. Whipping excites mode shapes that would not normally be present in the response, as their natural frequencies are significantly higher than the wave encounter frequency. This results in detrimental contributions to fatigue life through high-amplitude cyclical bending moments. Both the calculation of slamming loads and the prediction of resulting structural responses have been a challenge for several decades. The highly nonlinear and three-dimensional character of the phenomenon, combined with the strongly coupled fluid-structure interaction means that it is unpredictable, and even the definition of slamming events has been a matter of disagreement among researchers. Experiments are still a vital part of these investigations, for validating ever-improving numerical techniques. An essential issue with experiments is the extent to which mode shapes and natural frequencies can be emulated in model scale. Traditional hydroelastic models are segmented and use either a flexible backbone or flexible joints to introduce stiffness. This often results in an excellent description of the 2-node bending mode, but an increasing error for higher modes leads to stress inaccuracies. In this investigation, a continuous model of a catamaran is designed and produced for hydroelastic experiments. The advantages and limitations of the concept are identified, the verification against structural models is presented, and the calibration of the measurements is discussed.

Original languageEnglish
Title of host publicationHSMV 2023 - Proceedings of the 13th Symposium on High Speed Marine Vehicles
EditorsErmina Begovic
PublisherIOS Press
Number of pages10
ISBN (Electronic)978-1-64368-443-7
ISBN (Print)978-1-64368-442-0
Publication statusPublished - 2023
Event13th Symposium on High Speed Marine Vehicles, HSMV 2023 - Naples, Italy
Duration: 23 Oct 202325 Oct 2023

Publication series

NameProgress in Marine Science and Technology
ISSN (Print)2543-0955
ISSN (Electronic)2543-0963


Conference13th Symposium on High Speed Marine Vehicles, HSMV 2023


  • additive manufacturing
  • elastic model
  • hydroelasticity
  • scaling
  • slamming
  • whipping


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