Calculation of the stress-strain state of the bottom section of the supply vessel during edging in the process of manufacturing using the program «LIRA»

Abstract

The article presents a calculation of the stress-strain state of the bottom section of the supply vessel during edging in the course of production using the LIRA software package. This calculation is necessary to check the strength of the structural elements of the section, casings and cables during edging in the manufacturing process. Attention is paid to the modelling of boundary conditions, including the fastening of casings and the distribution of mass loads, and software features are also taken into account, such as the indirect setting of the modulus of elasticity through the stiffness parameter EI_y. To verify the model, analytical calculations of brand blocks were previously performed using classical formulas for the resistance of materials. A comparison of the results of manual calculations and the data obtained in the LIRA program showed a discrepancy of less than 5 %, which confirms the correctness of the accepted assumptions and the finite element model. The analysis allowed us to determine the areas of maximum stress concentration and deflection values that do not exceed the permissible limits according to regulatory documents. The forces acting on the fastening elements were established, which made it possible to justify the choice of design solutions and technological parameters. The calculation results demonstrated the high efficiency of the LIRA software package in engineering tasks, providing reliable prediction of the behaviour of the structure under installation loads. The data obtained can be used to optimize technological equipment, reduce risks and increase safety during production. The presented methodology confirms the prospects of integrating the LIRA program into the engineering practice of designing and manufacturing ship structures.