Vessel Main Propulsion Engine Performance Evaluation

Abstract

In general, the performance of a ship in service is different from that obtained on shipyard sea trial. Apart from any differences due to loading conditions, and for which due correction should be made, these differences arise principally from the weather, fouling and surface deterioration of the hull and propeller. The influence of the weather, both in terms of wind and sea conditions, is an extremely important factor in ship performance analysis. Consequently, the weather effects needs to be taken into account if a realistic evaluation is to be made. The primary role of the ship service analysis is a standard of performance data, under varying operational and environmental conditions. The resulting information, derived from this data, becomes the basis for operational and chartering decision. In addition, the part for the data records is to enable the analysis of trends of either the hull or machinery, from which the identification of potential failure scenarios and maintenance decisions can be derived. The traditional method of data collection is the deck and engine room log records, and this is the most commonly used method today. In terms of data processing and capabilities, this method of data collection is far from ultimate, since involves significant data distortion risk. Instrumentation errors are always a potential source of concern in performance analysis methods. Such errors are generally in the form of instrument drift or gross distortion of the reading. However, these can generally be detected by the use of trend analysis techniques. The procedure for the evaluation of the ship's service performance, that relies on proven methods of main propulsion engine service data analysis used and applied for container vessel small feeder. The vessel is equipped with indirect main propulsion, driven by means of modern medium speed engine. The different approach demonstrated to achieve the reliable and accurate main engine performance. The difference in developed engine power has been found, that corresponds well to registered sea trial results and engine retrofitting reports done, in order to limit the effective power.

Operational Shipping Intelligence Through Distributed Cloud Computing

“…In this context, for improving the accuracy of a propulsion performance prediction model, it is important not only to understand the effect of external factors like wind and wave on the propulsion performance but to base our research on very accurate weather forecasts. Borkowski et al (2012) also show that in general, the performance of a ship in service is different from that obtained on shipyard sea trial. Apart from any differences due to loading conditions, and for which due correction should be made, these differences arise principally from the weather, fouling and surface deterioration of the hull and propeller and in this case, the weather effects need to be taken into account if a realistic evaluation is to be made.…”

Analisis Engine Propeller Matching Propulsi Kapal Ikan Tradisional Dengan Pto Generator

“…Kinerja kapal dalam pelayanan yang berbeda dari yang diperoleh selama uji coba sea trial yaitu kondisi muatan, pengaruh lingkungan, kondisi cuaca dan fouling, kerusakan permukaan lambung dan baling baling, adalah faktor yang harus diperhatikan untuk melakukan reanalisis dan koreksi atas kinerja sistem propulsi kapal. Hal ini disebabkan karena perubahan kondisi akan menghasilkan perubahan beban propulsi kapal yang berakibat pada perubahan kinerja sistem propulsi [8,9]. Perbedaan riset yang telah dilakukan oleh Barkowski dkk adalah dalam riset ini, reanalisis dan koreksi kinerja sistem propulsi akan diterapkan pada penggunaan shaft generator untuk penggerak pembekuan cepat mesin pendingin.…”

Quantitative Indicators of the Instantaneous Speed of a Ship’s Main Engine and its Usability in Assessing the Quality of the Combustion Process

“…A ship's internal combustion engine is usually equipped with diagnostic subsystems that are used to assess the performance of the engine during operation, as well as to detect engine malfunctions and to locate any faults as per the adopted operating strategy (Piasecki et al, 2017;Chybowski, 2018;Chybowski, Gawdzińska and Souchkov, 2018;Chybowski, Gawdzińska and Laskowski, 2019;Kazienko, 2019;Bejger and Piasecki, 2020). Depending on the purpose and design of the machine, different diagnostic methods can be used (Kluj, 2000;Quan, W., Wei, J., Zhao, YW., Sun, LH., Bianl, 2011;Borkowski, T. Kowalak, P. Myśków, 2012;Ulewicz and Mazur, 2013;Bonisławski et al, 2019;Dunaj, Dolata and Berczyński, 2019;Dunaj, Marchelek and Chodźko, 2019;Ulewicz et al, 2019). For diesel engines that are equipped with indicator cocks, the graphs of the combustion pressure can be analyzed to provide this data (Bueno, Velásquez and Milanez, 2009;Chybowski, 2019).…”