TY - JOUR 
A1 - Torralba Ben Amar, Diego Elías
T1 - Analytical and numerical determination of the hull girder deflection of inland navigation vessels
Y1 - 2015
UR - http://hdl.handle.net/10317/4872
AB - In this project, the analytical and numerical determination of the hull girder deflection of inland navigation vessels is carried out.
This means that this project joins together different knowledge related to shipbuilding, strength of materials, ship design, rules and regulations, drawing applied to shipbuilding and advanced Finite Element Analysis of structures. The structure of a ship suffers different types of deformations from the building stage to the end of its service. These deformations have different sources like local buckling, thermal influences, global bending moment or even weldings during workmanship. The hull girder deflection occurs when a vessel undergoes vertical bending moment, which can be caused by the lightship weight distribution, the load distribution and the wave induced global loads. The value of the hull girder deflection should be maintained within a range compatible with a proper operation of machinery and equipment onboard. For instance, some difficulties may occur in shafting but also piping. Concerning the main shaft, it can experience higher torsional moments due to the eccentricity and inefficiency because of the bigger efforts of the shaft between the bearings. When deflection occurs, piping can meet some problems like stuck liquids and important efforts in the supports. According to International Standards, hull girder deflection is limited to 1 mm per meter of ship length. As per the classification rules, no specific limits on hull girder deflections are given explicitly, but the L/D ratio is related to the criteria which allows safeguarding against excessive deflection. Studying this phenomenon is essential for the definition of the criteria allowing safeguarding against excessive deflection. This investigation deals with the determination of the response of the ship complying with Bureau Veritas Rules for the Classification of Inland Navigation Vessels, in the form of deflection, to the applied loads.The study is carried out according to the following steps: 1. The structure strength of a chemical tanker is checked according to the BV Rules for Inland Navigation Vessels using Mars Inland and the FEA software FEMAP with NX Nastran.2. Analytical determination of the hull girder deflection of the chemical tanker 3. Numerical determination of the hull girder deflection of the chemical tanker 4. Analytical determination of the hull girder deflection of standard inland navigation vessels The analytical method consists of the calculation of the deflection of the ship due to bending, which is similar to that for a beam. The ship is considered free-free supported and has a varying moment of inertia (I), and the deflection is obtained by the second integration of the MB/EI curve. The numerical method refers to direct calculations by using Finite Element Analysis. The main aim of using FEA in structures is to obtain an accurate calculation of the hull structure response so that the analytical method can be validated.
KW - Mecánica de Medios Continuos y Teoría de Estructuras
KW - Marine engineering
KW - Ingeniería naval
KW - Shipbuilding
KW - Construcción naval
LA - spa
ER -