Projektiranje konstrukcije putničkog katamarana

Cilj rada je prikazati glavne specifičnosti konstrukcije putničkog katamarana projektiranog za riječnu plovidbu. Proračun čvrstoće proveden je prema Pravilima Bureau Veritas-Inland Navigation Vessels. Brod se sastoji od čelične konstrukcije trupa i aluminijske konstrukcije nadgraña. Zbog specifične konstrukcije boka nadgraña, većim dijelom izgrađene samo od vertikalnih okvira, posebna pažnja posvećena je projektiranju nadgrađa. Kako bi projektom osigurali da što manje opterećenja s gornje palube bude preneseno na vertikalne okvire boka, gornja paluba je na bokovima nadgrađa oslonjena na dvije uzdužne linice, projektirane da budu primarni nosači gornje palube. Analizirana su maksimalna naprezanja i maksimalni progibi pojedinih strukturnih elemenata, posebno gornje palube i bokova nadgrađa. U svrhu verifikacije predloženog koncepta izrađen je grubi MKE modela cijelog broda koji je korišten za kontrolu strukturnog integriteta katamarana prilikom porinuća

Numerical Procedure for Two Beam Elastic Impact Analysis

The procedure for numerical analysis of the elastic impact of two beams is presented. The beams are modelled by using the FEM technique, and for time integration of dynamic equilibrium equation the modified linear acceleration method is applied. Special attention is paid to contact problem and to calculation execution. A short review of the energy conservation principle based method for impact force determination is also given. The procedure is illustrated with the case of collision of communication bridge between two offshore platforms and the protective construction, called arrestor. The results are compared to those obtained by energy conservation principle based method. The study of damping influence on system dynamic response is also added

DYNAMIC POSITIONING OF OFFSHORE ANCHOR HANDLING TUG SUPPLY (AHTS) VESSELS (UT 788 CD Project)

Each vessel exposed to the forces of wind, waves and changes in sea level due to tidal streams and forces caused by the propulsion system, changes its position and heading. The basic function of the dynamic positioning system is to maintain the vessel\u27s position and heading. This article analyses the use of the FMEA (Failure Modes and Effects Analysis) of dynamic positioning system of off-shore vessels which includes analysis of all subsystems connected to dynamic positioning (production and distribution subsystem of electrical power, automatics, propulsion and controller subsystems)[1]. Specifically, it is dealing with the dynamic positioning of the vessel UT 788 CD for deep anchoring, towing and platform supply, analysed in two operational modes: diesel electrical and conventional mode. According to the FMEA, the UT 788 CD vessel has met all the DP 2 class requirements for operating within the foreseeable volume in accordance with the IMO classification