The article was submitted by Tadeusz Graczyk for the conference in Kraków as part of the Polish Presidency 2025.
Modelling taking into account different production technologies and various materials
Efficient use of water sea-river transport requires consideration of a number of environmental constraints of the selected route. Inland water transport is particularly in demanding in terms of vessel immersion. Therefore, the solution must be considered to minimize the weight of the structure. This is achieved through innovative design solutions vessels group metal (steel or aluminium), and lightweight materials, such. composites or foamed materials.
Ship design that meets specific functional assumptions requires a comprehensive look at the entire life cycle of a technical object, i.e. the stages of production, operation and decommissioning. In this approach the ship is treated as a system with defined inputs and outputs. The balance of these streams allows to specify the cost of providing the functionality for a specified period and their impact on the environment of the system.
Considering the life cycle of a vessel in a broader population in the context of a long-term operation of the shipbuilding industry are noticeable two cycles: the product and the energy- material.
The vessels production process is so complex and lengthy that comprehensive modelling, taking into account the operational details is impossible due to the enormous computational complexity. Therefore, the theoretical models are developed for fragmented processes.
It should take into account that the proportion of these areas in the production process depends on both the size of the unit and of the material of construction of the hull. Particularly strong differences in the selection of manufacturing techniques and their organizations exist between the productions of a composite metal.
Modeling methods fragmented shipbuilding processes are developed at different rates in the world literature.
In the stage of the exemption from the operation of the vessel are important product recycling operations (regeneration ship subsystems for further use), recycling of materials (processing of raw materials and materials) and energy recycling (among them heat recovery in combustion processes). Consider the possibility of recycling at the stage of determining the basic parameters of the unit and its detailed design is an open question. This problem requires the development of disassembly sequence planning model and technological models processing and disposal of materials.
Taking into account modelling the various forms of spatial ship hull
The main objective is to develop the appropriate structure of the hull of the vessel by means of alternative and innovative materials and its verification in cases of collision and grounding (the impact of a ship on the seabed or waterway side). The specific objectives are:
• Identification and development of existing structures and river-sea vessels (identification of the basic features of general-design and construction – the main dimensions, spatial planning, construction material, arrangement and dimensions of bonds et al.),
• The development of a ship’s hull structure for the project,
• Structural optimization of hull structure. Formulate optimization models developed variants of ship construction, which will be carried out optimization calculations. Optimization of the structure will ensure the selection of structural variants of minimum weight design. Recommended to be models / variants of the structure for stress analysis (analysis of overall strength, the strength of the local board, limit load <analysis of structural strength, overall strength, strength of primary and secondary members, the ultimate capacity>, also using innovative materials). The proposed indicator will be the size of the (relative) allowing for a comparison of existing units and developed concepts.
This article is a fragment of the prepared grant „Modelling sea-river ships and infrastructure in Baltic-Adriatic-Black Sea water connection area”.
Author : Tadeusz Graczyk