PROJEKTIRANJE STRUKTURE JAHTE IZ ALUMINIJA

Cergol, Nicola (author), Vidmar, Peter (mentor)

Na podlagi izbranega klasifikacijskega društva in karakteristik jahte z uporabo navodil in postopkov ter enačb se bo v začetnih poglavjih izvedlo dimenzioniranje glavnega rebra. Glavno rebro je strukturalni element ladje, ki v najširšem obsegu definira obliko in strukturne elemente, ki sestavljajo jahto. V začetni fazi se bo uporabilo LR program SSC Rules Calc. Po tem, ko se bo definiralo glavo rebro, se izvede načrte in dimenzioniranje strukturalnih elementov jahte v področju 0.4 L, kar pomeni v področju 40 % njene dolžine. To zajema področje kabin potnikov, posadke in tudi strojnico. V nadaljevanju se bo izvedlo načrte in dimenzioniranje krmnega dela jahte, kjer so po navadi zunanji odprti del in seveda tudi ladijski vijak. Zadnji del trupa, ki je narisan in analiziran v magistrski nalogi je premčen del, kjer se nahajajo elementi za vezanje jahte in veriga, zato je potrebno upoštevati tako lokalne kot globalne obremenitve. Vse jahte pa imajo tudi nadgradnjo, kjer so po navadi bivalni prostori lastnika jahte. Zato se bo v zadnji fazi izvedlo načrte in dimenzioniranje strukturalnih elementov nadgradnje, ki so nekoliko lažji in manj togi, saj ti elementi ne prenašajo globalnih obremenitev, kot jih prevzema trup. Prečni elementi jahte bodo zaradi kompleksne razporeditve dimenzionirani z uporabo metode končnih elementov. Ta metoda je bolj natančno opisana v zadnjem delu naloge, kajti ta numerična metoda dopušča bolj deteljni opis in definiranje strukturnih elementov, kar seveda pomeni mnogo bolj natančen izračun premikov, deformacij in napetosti. Iz klasifikacijskega društva so bile prevzete dopustne vrednosti, ki so bile primerjane, in kjer kriteriji niso bili zadoščeni, so bili strukturalni elementi ustrezno povečani. V zaključku bo izvedena analiza dobljenih rezultatov, prav tako pa bodo podana priporočila za projektante ter raziskovalce pri analizi podobnih projektov in raziskav.

• Language: Slovenian
• Keywords: Projektiranje, struktura, ladja, aluminij
• Work type: Master's thesis/paper
• Organization: FPP - Faculty of Maritime Studies and Transport
• Year: 2024
• PID: 20.500.12556/RUL-161339
• Publication date in RUL: 10.09.2024

Secondary language

• Language: English
• Title: STRUCTURAL DESIGN OF A LIGHT ALLOY YACHT

Abstract

This thesis addresses the design of a 53-meter-long aluminum yacht. This length was chosen as it is most characteristic for this type of vessel, with yachts ranging from 24 meters to over 100 meters in length. The task begins by selecting a classification society based on literature review and vessel typology. Lloyd's Register (LR) was chosen, and based on the selected classification society and yacht characteristics, the initial chapters involve the dimensioning of the midships section using guidelines, procedures, and equations. The midships section is a structural element of the ship that, to the greatest extent, defines the shape and structural components of the yacht. In the initial phase, the LR program SSC Rules Calc is used. Once the main frame was defined, the plans and dimensioning of the yacht's structural elements in the 0.4L area, meaning 40% of its length, were executed. This area encompasses the passenger cabins, crew quarters, and the engine room. Furthermore, the plans and dimensioning of the yacht's stern section, where the exterior open area and the ship's propeller are typically located, are carried out. The final part of the hull, drawn and analyzed in this project, is the bow section, which contains elements for mooring the yacht and the chain, thus requiring consideration of both local and global loads. All yachts also have a superstructure, usually where the owner's living spaces are located. Therefore, in the final phase, the plans and dimensioning of the superstructure's structural elements, which are somewhat lighter and less rigid since these elements do not bear global loads like the hull does, are executed. Due to the complex arrangement, the transverse elements of the yacht were dimensioned using the finite element method. This method is described in more detail in the final part of the project because it allows a more detailed description and definition of structural elements, resulting in much more accurate calculations of displacements, deformations, and stresses. Allowable values from the classification society were taken, compared (where criteria were not met), and structural elements were appropriately increased. In conclusion, an analysis of the obtained results is presented, and recommendations for designers and researchers analyzing similar projects and studies are provided.

• Keywords: Designing, structure, ship, aluminum