TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE

Science journal

 
ISSN (print) 2542-2324 /(online) 2618-8244


Articles of The Transactions of KSRC








DirEct method of load simulation in hull strength analysis of catamaran



Full text article ( in russian)

Year

 
2020

Issue

 
20202

Volume

 
2

Pages

 
230-236

Caption

 
DirEct method of load simulation in hull strength analysis of catamaran

Authors

 
Chistyakov R., Mudrik P.

Keywords

 
external force problem, FE unsupported model, potential fluid, linear motion theory, 3D formulation, static trimming, local and global stresses, class rules, catamaran.

DOI

 
10.24937/2542-2324-2020-2-S-I-230-236

Summary

 
This paper discusses three-dimensional formulation for the problem of external forces acting on catamaran hull, as well as performs stress-strain state analysis of the structures affected by the loads thus calculated. The purpose of this study was to develop a modern methodology for joint solution to the first and the second problem of naval structural mechanics based on panelpotential and finite-element models in three-dimensional formulation for the conditions of still water and regular waves. The study discusses various formulations of the problem and various methods of external force calculation. External load is estimated in two formulations: static (based on hydrostatic methods) and stationary dynamic (based on the linear theory of ship motions). Also, external forces and their respective stresses were estimated as per the procedure of the classification society. The case study of a catamaran illustrates the process of load calculation and stress-strain analysis, giving the results for various external forces, with their assessment and analysis of internal forces and displacements induced by them. The study yielded rather handy technique for stress-strain analysis of catamaran hull in 3D formulation, including spatial static trimming in still water and in waves of given profile, as well as calculation of displacement amplitudes in regular waves, calculation of phase pressure fields and accelerations on catamaran hull, with further export of calculated external loads to FE analysis software for stressstrain investigation of structurally similar model needed to understand how conservative this model is.

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