Object and purpose of research. The object of the research is the shaftline of an icebreaker and ice-going vessels, the purpose is to develop an algorithm for determining the loads for calculating the strength of the shafts of icebreakers and icegoing vessels under ice loads in a nonlinear dynamic setting and determining the dynamic magnification factor. Materials and methods. The study is based on finite element method (FEM). Main results. As a result of numerical analysis, the magnification factors of ice loads acting on the propeller shaft when vessel moves in an ice field up to 4 m thick are investigated. Conclusion. The research results can be used to calculate the fatigue strength of the icebreakers and ice-going vessels shaftlines.

This paper gives modal and structural calculations of jack-up rigs at operational and transportation stages, as well as more accurate structural calculations for jack-up supports, as well as effective stress ranges at hot points. Based on these results, the paper gives a simplified fatigue strength calculation for jack-up support, by means of Weibull bi-parametric distribution. It also compares fatigue damage accumulation rates of jack-up at different stages of their life cycles, as well as predicts its residual lifetime.

Object and purpose of research. This paper discusses jack-up platforms to analyze the influence of the elastic and damping properties of the soil on their hull vibration amplitudes in waves. Materials and methods. The research is based on numerical calculation methods (finite element method). Main results. As a result of the numerical analysis, the amplitude-frequency characteristics of the jack-up were constructed, which make it possible to see the significant influence of the dissipative properties of the soil on the jack-up hull vibration damping: greater dissipation effect of soil means stronger attenuation of jack-up vibrations. Conclusion. The research results can be used for design optimization of jack-up platforms, as well as for their fatigue strength and reliability calculations.

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purpose of the work is to automate the work in the construction of a finite element model (FEM) and to calculate the strength of a vessel and marine equipment objects using the universal programming language TCL and the graphic library Tk. Materials and methods. The study is based on the use of the finite element method (FEM) and the TCL programming language. Main results. A specialized data management tool has been created at the stage of constructing a computational model, which is universal and focused on reducing time several times compared to traditional technologies in the development of spatial complex finite element vessels and marine equipment objects. Conclusion. The results of the technology of automation of the construction of a ship model and marine equipment objects can be effectively used in research institutes and design bureaus in strength calculations.