Projektiranje konstrukcije dvoradne pristupne rampe za RO-RO brodove

master's thesis

• Title (english): Structural design of tilting ramp for RO-RO ships
• Author: Robert Geljić
• Mentor: Jerolim Andrić (mentor)
• Committee member: Ivan Ćatipović (predsjednik povjerenstva)
• Committee member: Smiljko Rudan (član povjerenstva)
• Committee member: Vedran Slapničar (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2022-07-19, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Shipbuilding; Constructive of Floating and Maritime Structures

Abstract

Cilj ovog rada je projektiranje konstrukcije dvoradne pristupne rampe za RO-RO brodove prema pravilima klasifikacijskog društva Det Norske Veritas (DNV) [1].
Projektiranje je provedeno u dvije faze. U prvoj fazi je prema preskriptivnim pravilima DNV-a dimenzionirana debljina pokrova rampe i profili ukrepa te su određene inicijalne dimenzije i raspored ostalih konstrukcijskih elemenata prema zadanoj geometriji iz predloška. Razmatrane su dvije varijante konstrukcije:
1. konstrukcija s niskim uzdužnim nosačima visine do 1100 mm ispod pokrova
2. konstrukcija s visokim bočnim stranicama visine do 1000 mm iznad pokrova i nosačima proračunate potrebne visine ispod pokrova
U drugoj fazi projektiranja provedena je analiza 3D globalnog modela metodom konačnih elemenata (MKE) u programu MAESTRO [2] za sve slučajeve opterećenja, za obje varijante konstrukcije. Rezultati analize provjereni su po kriterijima podobnosti DNV-a [3] za dozvoljene progibe, naprezanje, popuštanja i izvijanja. Elementi konstrukcije koji nisu zadovoljili neki od kriterija podobnosti su redimenzionirani. Nakon što su obje konstrukcije redimenzionirane i zadovoljile sve kriterije podobnosti, uspoređeni su rezultati odziva.
Na kraju je za odabranu konačnu konstrukciju napravljen 3D CAD model u programu Autodesk Inventor [4] iz kojeg su dobiveni osnovni klasifikacijski nacrti konstrukcije.

Abstract (english)

The objective of this thesis is structural design of tilting ramp for RO-RO ships in accordance with the rules of Det Norske Veritas classification society (DNV) [1].
The design was carried out in two phases. In the first phase, the thickness of ramp cover and the profile of stiffeners were defined in accordance with the prescriptive rules of DNV, while the initial dimensions and layout of other structural elements were defined based on the given geometry from the template. Two variants of structure were considered:
1. structure with low longitudinal girders up to 1100 mm high under the cover
2. structure with high sides up to 1000 mm above the cover and supports of the required height under the cover
In the second design phase, a finite element method (FEM) analysis was performed for all load cases on 3D global model using the computer programme MAESTRO [2], for both options of structure. The results of the analysis were checked by deflection, stress, yield and buckling DNV acceptance criteria [4]. Structural elements that had not met the acceptance criteria were resized. After both options of structures were resized and met all the acceptance criteria, the structural response results were compared.
Finally, the 3D CAD model of the chosen final structure was made using the computer programme Autodesk Inventor [4], from which the basic classification drawings were made.

• Keywords: dvoradna pristupna rampa; projektiranje; DNV; MKE model; kriteriji podobnosti; 3D CAD model
• Keywords (english): tilting ramp; structural design; DNV; FEM model; adequacy criteria; 3D CAD model
• Language: croatian
• URN:NBN: urn:nbn:hr:235:486220
• Study programme: Title: Naval Architecture; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka brodogradnje (magistar/magistra inženjer/inženjerka brodogradnje)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-07-19 07:31:16