Mitigation of vertical motion in planing crafts for enhanced operationability in seaways using passive energy absorbers – A test of concept

Himabindu Allaka, Maor Farid, Morel Groper

Research output: Contribution to journalArticlepeer-review

Abstract

High-speed planing crafts operating in seaways encounter high impact loads. The resulting extreme motions and accelerations adversely affect the craft's structural integrity and payload, and pose a risk to the onboard crew, thus limiting their year-round operability. Reducing the vertical acceleration and motions of these crafts in a seaway may ensure structural integrity, increase navigation safety, and extend their operational envelope. This study examines the effectiveness of deploying a linear passive energy absorber (PEA) – a tuned mass damper (TMD) – to mitigate the planing craft's vertical motion. Nonlinear equations of motion for the TMD installed on the planing craft operating in an irregular seaway were developed, and its effectiveness was evaluated and verified using numerical simulations. A significant reduction in the unwanted heave motions was observed around the sea states (SS) and the craft speeds used to fine-tune the TMD parameters. The effectiveness of the TMD, however, severely diminished in other SS and at other craft speeds. Based on our results, the application of the TMD to mitigate vertical motions of planing crafts seems an impractical solution. Other passive energy absorbers, such as nonlinear-PEAs or nonlinear energy sinks, should be considered as a way to address the TMD's shortcomings.

Original languageEnglish
Article number112434
JournalOcean Engineering
Volume264
DOIs
StatePublished - 15 Nov 2022

Bibliographical note

Funding Information:
The authors have been supported by the Maurice Hatter Foundation , the Fulbright Program , the Israel Scholarship Education Foundation (ISEF) , a Jean De Gunzburg International Fellowship , the Israel Academy of Sciences and Humanities , the Yitzhak Shamir Postdoctoral Scholarship of the Israeli Ministry of Science and Technology , and the Technion's PMRI – Peter Munk Research Institute .

Publisher Copyright:
© 2022

Keywords

  • Hydrodynamics
  • Motion mitigation
  • Passive energy absorber
  • Planing craft
  • Tuned mass damper

ASJC Scopus subject areas

  • Environmental Engineering
  • Ocean Engineering

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