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Engineering design and analysis references
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| Installation engineering of the complete Exhaust Gas Cleaning System |
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The cooperation between as2con-alveus ltd and Viktor Lenac shipyard, together with scrubber suppliers, resulted in the installation of a first Croatian „scrubber“ onboard an AFRAMax tanker owned by a Croatian ship operator Tankerska Plovidba. as2con engineered the installation in collaboration with Viktor Lenac who was in charge of conducting the installation. |
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FEM analysis of the hull structure of an open top river and sea-going barge
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In a new project, that begun this spring, as2con conducted FEM analysis of the hull structure of an open top river and sea-going barge. The analysis focused on the hull girder strength due to the vertical bending and torsional moments. The project was conducted in collaboration with Navis Concept, a naval architecture consultancy from Rijeka, Croatia. |
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| FEM strength assessment of the foundations and supports of an LNG tank |
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In collaboration with De-Naval ltd., a partner design office from Rijeka, Croatia, as2con conducted FEM strength assessment of the foundations and supports of an LNG tank onboard an LNG -powered tug vessel. The assessment considered loads emerging from the weight of the tank and acceleration due to the vessel's motions. The mentioned tug vessel was designed by a Norwegian partner company and presents a novel feature in the present maritime market. |
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| Assessment of the response of a British navy ship structure, in case of emergency towing |
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Using finite element analysis, as2con conducted the assessment of the response of a ship structure in case of emergency towing.
The analysis was conducted for a British navy ship in collaboration with British Cammell Laird Shiprepairers & Shipbuilders Ltd.
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| Structural analysis for hull steel replacement, FEM check on modified steel structure and different load case scenarios of a platform |
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In July, 2012 a new collaboration with 6Sigma Naval Architects also resulted in several analysis performed by as2con. Structural analyses for hull steel replacement, FEM check on modified steel structure with several critical load cases as well as 3 case load scenarios were performed on a platform in South Africa. |
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| Global and local hull structural analysis of a 1600t heavy lifting pipe laying ship |
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The cooperation between as2con and Viktor Lenac shipyard has once again resulted in a new successful project. Starting from May, 2012 as2con has conducted a serious of analysis for a special heavy lifting pipe laying ship (1600 t) which is currently undergoing a refit process. as2con performed hull global strength analysis including analysis of collapse, pipe rack analysis as well as analysis of other structural details. |
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Concept development of a large asphalt carrier using CAFE software |
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In collaboration with 3. MAJ shipyard, as2con is working on development of a large asphalt carrier. Usage of CAFE ship design software is essential in this project, due to its capacity for rapid generation of hull structural concepts. The project is soon to end, and the results will be also publicly presented in the coming SORTA conference, in October 2012. |
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FEM analysis for German Consultacy 8.2
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as2con has been contracted by a German consultancy 8.2 to develop FEMmodels of ships for the collision analysis with offshore wind turbine. A standard AFRAMax tanker structure has been designed using the CAFE software.
FEM model was prepared also in CAFE, ready for export to LS-Dyna. Using thespecial "RE-MESHER" tool developed by as2con, certain areas of interest of themodel were fine-remeshed in order to allow for accurate collision simulations.
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As2con-alveus ltd. has performed the longitudinal strength analysis of the 110 m river tanker Neptunus using the finite element method (FEM). The ship has been modelled using CAFE - innovative ship design software. The task has been performed for Bomex shipyard.
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As2con-alveus ltd. has been working on the classification documentation for the 45 m tug/supply vessel – Alsadiq. The documentation included Stability Booklet, General Arrangement, Fire and Safety Plan, Main Frame Drawings, Shell Expansion Drawings, Lines Plan Drawings, Tank Capacity Plan and Transverse Bulkhead Drawings. The task has been performed for the Pacific Light Shipping Ltd.
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as2con has conducted stress analysis of a pipeline in a pump station of an asphalt carrier in 3. MAJ shipyard. Analysis has been done using Finite Element Method (FEM). Stresses within the pipe walls appear as a result of external loads caused by thermal expansion of the pipeline as well as the vertical displacements of cargo tanks which occur when the ship is in ballast. |
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as2con has been contracted by 3. MAJ shipyard to perform structural analyses of newbuilding’s NB 716 deck with the mooring equipment installed onboard asphalt carrier for Swedish shipping company Wisby. Analyses have been done using Finite Element Method to check whether the equipment can withstand safe working load following the requirements of the Mooring Equipment Guidelines.
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DOK-ING ltd., Croatian developers of the electric car "XD concept", have included as2con in part of their development phase. Currently, we are working on improvements on the front bumper's crashworthiness. Non-linear finite element simulations of car collision are carried out in order to improve the bumper design. |
Harvester of Sorrow - keeps the sea clean
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We have developed a concept of the innovative vessel for sea cleaning - Harvester of Sorrow.
The purpose of this modular vessel is cleaning spills and other solid and liquid sea pollution.
It is based on the modularity with the detachably rotating drums and floating modular containers.
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Crashworthy coastal LNG carrier
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We develop a conceptual design of the 750t DWTcrashworthy coastal LNG carrier for transportation and distribution of LNG cargo along the Adriatic coast. Gas distribution in ports will be performed through the LNG reception facilities.
The vessel is designed with a crashworthy side and bottom hull structure in order to reduce the risk of collision and grounding. In combination with azimuthing propeller, this will allow safe harbour operations without tug assistance.
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MorphHull - a wind farm service vessel
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MorphHull is a wind farm service vessel. It is operating in two modes: SWATH (used when approaching wind turbine and for transfers equipment and personnel) and mono-hull (used in voyage).
The combination of mono-hull and SWATH mode gives the best characteristics of both modes when needed – mono-hull mode for high-speed transit and SWATH-mode for low-motion transfers of personnel and equipment.
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The measurement of vibrations on a motor yacht (2010)
as2con was employed to measure vibrations on a 40 m luxury long motor yacht. The measurements were performed in engine room, engine room garage, on fly deck and in saloon. A proposal to mitigate excessive levels of vibrations were proposed.
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Grand Circle Cruise Lina engaged as2con to perform measurements of vibration and noise on the river cruiser in Egypt in the beginning of July 2010. We found ways to reduce vibrations and noise on the cruise under the condistions of navigation and in terms of berth.
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Lifting analysis and design of supporting structure.
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as2con has been contracted by IHC Merwede to perform full support in development of the innovative design of a dredger funnel deckhouse. The speciality of this design is the application of all-steel laser-welded steel sandwich panels. Design and engineering feature: parametric 3D FEM model for optimization of panel scantlings, detailed stress assessment of all joints and their design, design for production, support in assembly and installation. |
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Losinjska plovidba Ltd. contracted AS2CON to assess vibration of auxiliary engine and generator set. The FE model was generated using FEMAP computer program. Model includes foundations of engine and generator set (big asymmetrical T-bars, tubes, brackets), engine with all important parts (pistons, crankshaft) and generator. Improvements are suggested to owner of the ship for consideration and feasibility check.
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Forced vibration and noise analysis utilizing Finite/Boundary Element Method for a 108 m long asphalt carrier with recommendations for improvement of these characteristics to meet the IMO requirements. The study is contracted for KRALJEVICA SHIPYARD, Croatia. |
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Forced vibration and noise analysis Finite/Boundary Element Method for a 90 m long container-passenger ferry, with recommendations for improvement of these characteristics to meet the Comfort Class requirements.The study is contracted for DELTAMARIN GROUP Oy, Finland.
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24 m, 30 kn + composite motor yacht with fly bridge and luxurious interior. |
Forced vibration analysis of a car-passenger ferry (2007)
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Forced vibration analysis of a double-ended car-passenger ferry with recommendations for improvement. The study was conducted for a shipyard KRALJEVICA in Croatia within a period of 2 months. The full-ship model was built within 15 days to the detail of a stiffener. The detail and global response analysis are conducted concurrently.
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New type of lightweight steel sandwich panel, produced via a patented rolling technology by SHIPPAX Oy, is applied for roofing of industrial hall. Three versions of a roof are considered, two cylindrical and one flat roof concept. The roof is analysed under uniform pressure load, simulating snow load, up to the point of total collapse. Ultimate load is identified for all the three versions. |
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Elastic analysis of the laser-welded steel sandwich panel produced by KENNOTECH Oy with Z-Core, including fire insulation cut-outs, and foam core filling with finite element method. The analysis evaluates the overall deflection and stresses of the sandwich panel under loading and investigates the influence of different foam properties on the response.
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Linear elastic analysis of the steel mould structure produced by RIMERA Oy is performed with the finite element method. The Analysis evaluates the overall deflection of the mould under loading of the wet concrete, and investigates the influence of different connections, joints, and most important of the clamping system applied in the mould. |
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Analysis of the behaviour of laser-welded steel sandwich panels with web-core, or I-core under impact loadings. This study is conducted with the purpose to investigate the possibility of using such panels as outer shells of ships. Preliminary results show that with proper design it is possible to reach and in some case surpass the equivalence of conventionnally stiffened panels.
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The aim of this study was to design and study the applicability of laser-welded steel sandwich panels as the staircase module within a cruise-ship. This concept allows for the complete prefabrication of such a module that can eventually increase the efficiency of the ship production and reduce the building time. The module was considered as the integrated part of the ship structure carrying all the global loads. Therefore, the actual loads have been obtained from the modified global finite element model for an existing ship where the existing finite elements have been modified accordinagly to represent the installed sandwich staircase module. Additionally to the assessed strength, as2con evaluated the fatigue life for the critical joints, including the module's corners, the panel and the deck connections. |
Comparative study of corrugated sandwich panels (2005)
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A parametric study was performed so to evaluate the benefits from non continuous corrugation over continuous corrugation of laser-welded steel sandwich panels. The benefits between the panels have been evaluated in terms of weight savings at approximately equal strength properties. The study also involved the basic test planning.
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Design and analysis of steel sandwich flooring for a large sports hall: ESPORT ARENA (2004 - 2005)
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The Esport Arena for various sport events was opened in spring 2006. The Arena has two levels containing separate sport fields. The challenge was to design a structure of a large span, free of supporting pillars, for the middle floor. Laser-welded steel sandwich panels were then choosen as the ideal solution for this problem. The performed analysis included the different loading conditions on the panel, including eigen-frequency for prevention of resonances during events. Finally, as the floor built of sandwich panels was covered with concrete slabs as2con modelled the steel-concrete interaction. |
Fire resistance of steel sandwich panels (2003 - 2004)
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Investigation of fire resistance properties of a corrugated laser-welded sandwich panel in order to determine the lowest acceptable thickness of insulation material needed to improve the fire resistance properties of the panel. Two different insulation materials were considered: Tarec Ecophen40 and Rockwool90.
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