ON THE STATISTICAL PROPERTIES OF THE METACENTRIC HEIGHT OF SHIPS IN FOLLOWING SEAS

Systematic numerical computations of the metacentric height GM in regular waves are presented in terms of mean values and amplitudes of the first harmonic variation. Significantly larger variations are found for two hull forms of ro-ro type than for a more traditional hull form. Time domain simulations are then used to compute GM-spectra's and statistics in irregular seas. These simulations show that the random process of GM is non-linear, exhibiting a low frequency process. This slowly varying part of GM reduces the absolute values of large minimum peak values, producing skewed distributions. Application of linear response theory for prediction of the process at wave encounter frequencies shows good agreement with simulations. Further, an approximate non- linear method, in which the slowly varying process is considered a function of the envelope of the linear variation, is evaluated. Statistical distributions obtained by the proposed method shows qualitatively fair agreement with distributions obtained from simulations.

• Supplemental Notes:
  • STAB 94, 5th Intl Conf on Stability of Ships and Ocean Vehicles; 7-11 Nov 1994; Florida, USA. Sponsored by SNAME, USA and RINA, UK. Proc. Publ by Florida Inst Technology, USA. Vol 4, session 15 [21 p, 15 ref, 2 tab, 8 fig]
• Authors:
  • Palmquist, M
• Publication Date: 1994

Language

• English

Subject/Index Terms

• TRT Terms: Following seas; Metacentric height; Numerical analysis; Stability (Mechanics); Statistical analysis
• Subject Areas: Data and Information Technology; Marine Transportation;

Filing Info

• Accession Number: 00717503
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Mar 4 1996 12:00AM