"Engines room are equipped with a ventilation system which should
provide fresh air for combustion and for removing the heat radiated
by main engines, auxiliary engines, boilers, generators and other hot
equipment installed in compartment. The paper presents the main requirements, recommendations and challenges regarding designing and construction of the ventilation system. The principal design aspects highlighted in this material are related to reducing the pressure drop across the distribution system to reduce the energy used by the fan to blow the air inside the room and to identify the best arrangement of air distribution inlet/outlet in order to get high efficiency of the cooling air."
. In this paper a parametric static and torsion analysis on a catamaran ship structure made out of composites materials is performed. The best solution for material selection is based on specific criteria for certain analysis. For dynamic analysis, the main criteria is to obtain the structure natural frequencies in a range, far from the resonance frequencies produced by the ship propulsion installation, wave loads etc. For static analysis the comparative criteria is to obtain the lowest weight of structure for the same strength. Also, buckling item is other criteria for comparative analysis. The comparative analysis is performed between rule based scantling structure and a FEM based structure for a composite material twin hull deck, in order to reduce the total hull weight. Material used for ship deck structure of the analyzed ship is e-glass polyester.
The modernization of the Danube IWT fleet involves developing the needed know-how for retrofitting of the Romanian fleet in accordance with Stage V emissions legislation. The end goal is achieving lower air pollutant emissions by increasing efficiency, lowering energetic needs and decreasing the environmental footprint of the Danube IWT fleet. The following paper presents principles of the design-for-retrofitting methodology developed for inland ships. The technologies involved aim at improving the efficiency of emissions after-treatment and meeting Stage V requirements.
Following to the great accidents the interest in preventing environmental pollution and the safety of people and means of maritime transport have increased. The idea of developing new, unconventional structures, imposed by the new requirements of Shipbuilding Rules related to safety and pollution is analyzed in the paper. The behavior of the unconventional double hull of a ship structure concept, named ARC, loaded to transversal impact is treated. In the paper the finite-element analysis is used because is important to provide the structural designer that no stress concentrations exist in a certain design. The results obtained for energy absorption and general ship hull behavior encouraged the authors to introduce in shipbuilding the unconventional double hull of the ship structure concept.
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