Automatic Calculation of Torsional Vibrations on Marine Propulsion Plant Using Marine Two-Stroke Diesel Engine: Algorith
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ORIGINAL CONTRIBUTION
Automatic Calculation of Torsional Vibrations on Marine Propulsion Plant Using Marine Two-Stroke Diesel Engine: Algorithms and Software Do Duc Luu1
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Cao Duc Hanh1
Received: 10 January 2020 / Accepted: 3 October 2020 The Institution of Engineers (India) 2020
Abstract For a sea-going ship to be built new or reconstructed, the main propulsion plant (MPP) consisting of a marine diesel engine (MDE), driving the ship propeller, is mandatory to be calculated with the torsional vibrations (TVs) in accordance with the Rules for the Classification and Construction of Sea-Going Ships, such as Russian Maritime Register of Shipping (RMR), DNV, ABS, and VR. The TV calculations (TVC) are conducted at normal working regimes and at misfire regimes (called by Normal or Misfire regimes relatively) with only one of cylinders of MDE while engine speed range covers from the minimum to maximum values of the operation speeds. The TVC on the MPP are incredibly sophisticated calculations and are conducted with special software for TVC. The paper presents the algorithms and software for automatic calculating the TVs (SATVC) basing on the made mathematical models, algorithms and coded in LabView by authors. The SATVC was automatic calculated the freedom TVs (FTVs), excited torsional moments (ETM), excited TVs (ETVs), permitted torsional pressures (PTP), and common management (CTVC). In the article were shown the probated results of TVC using the SATVC for the MPP on MV.HR.34000 DWT which built in Pha Rung Shipyard, Viet Nam. Keyword Torsional vibration calculation Main propulsion plant Electronic supplementary material The online version of this article (https://doi.org/10.1007/s40032-020-00626-y) contains supplementary material, which is available to authorized users. & Do Duc Luu [email protected] 1
Vietnam Maritime University, Hai Phong city, Viet Nam
Software for automatic calculation of torsional vibrations (SATVC)
Background The TVs are most dangerous vibration type of the different vibration types on the MPP, installed with the two-stroke MDE as the main engine. Therefore, the members of IACS, such as RMR, DNV, ABS, and VR et al, give the torsional vibration criteria to test, survey, and estimate the current torsional pressures of the MPP components at the observed speed and diesel condition regimes. Recording the torsional pressure of the MPP is conducted first by looking for the proposal TVC that is submitted to the maritime register. Second, the TVs on the MPP are measured in the sea-trail test. The TVC is approved finally by the register organization if the calculated results are suitable with the measured ones [1–5]. In practice of building a new sea-going ship in Viet Nam (from 2004 to 2019), there are conducted TVC by some competency agencies in the world shipbuilding field ([1] for MV. BinhAn Valliant; [2] for MV.HR.34000 DWT; [3] for F56-NT03: cargo ship 56200 DWT; [4] for MV.Vinashinsky). The TVC are carried out at the normal and misfiring working regimes (Working Condition Regimes, WCR)
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