engleski

Selection and evaluation of marine shafting torsional vibrations calculation software

Calculation of torsional vibrations shall be performed in an early phase of designing a ship propulsion system, immediately after defining the ship propeller, selection of the main propulsion engine, eventual reduction gearbox and dimensioning of each particular shaft cross section. Both the shipyard designer and the classification society technical specialist, approving technical documentation, are to have on their disposal appropriate computer software for this purpose. The paper presents the procedure that has been done in the Croatian Register of Shipping (CRS) with the aim to select and adopt the computer program for review of marine shafting torsional vibrations calculations, within the plan approval process. After that, an extensive evaluation of the selected program was performed, by testing on selected examples of two-stroke and four-stroke engine systems. On the basis of this evaluation, it was recommended that the CRS chooses SimulationX software program, capable of practical and correct modelling of excitation, various types of damping, non- linear characteristics of flexible couplings and propeller behavior in ice. Several modifications were also needed in terms of developing new elements. Results of testing showed satisfactory program capabilities and achieved precision of its results. In addition to this, based upon experience gained at the CRS, the Faculty of Maritime Studies decided to use SimulationX in education to enable the students and researchers simulating various technical systems.

marine propulsion system ; shafting ; torsional vibrations ; SimulationX

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