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Stability Criteria Analysis for Landing Craft Utility

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Technical Report

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Naval Postgraduate School Monterey 93943 United States

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Currently used Landing Craft Utility LCU stability criteria may not be optimal for the typical coastal transits of those vessels. Therefore, this study examines the intact transverse static and dynamic stability of the LCU in order to recommend more appropriate criteria for short-range transits. The analysis mainly uses the Program of Ship Salvage Engineering POSSE software and the standard Ship Motion Program SMP to model a stochastic sea state, simulate the LCUs loading conditions, and predict the crafts dynamic responses in certain sea state conditions. The LCUs static transverse stability is derived by the POSSE software in terms of righting arm diagrams for different loading conditions, while the SMP software determines the dynamic transverse stability. The SMP analysis is based on seakeeping theory, using sea spectra model techniques to determine the LCUs roll angle dynamic responses. Based on these simulation results, the study evaluates the currently used stability criteria and arrives at new dynamic stability recommendations and improved operational limits. These may be further refined by using hull appendage implementations in follow-on studies.

Subject Categories:

  • Mechanics
  • Marine Engineering

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