Abstract
The quality or reliability of diagnostics is understood as obtaining the most likely diagnosis, and finding possible causes leading to incorrect operation of the system. In real engine running conditions it is often very difficult. Dependable methods providing the most reliable diagnoses have not been developed yet. It becomes more and more important to identify the limit state in condition monitoring—the state that should not be exceeded because continued operation of such a machine is not advisable for technical, economic, or operational safety reasons. The authors have implemented a method using acoustic emission signal analysis for the identification of the injection pump limit state in a working engine. The use of the cross gain function allows one to reliably diagnose limit conditions related to the wear of the precision pair in injection pumps of running engines, working as energy transmission systems on ships and in land-based power stations. The paper draws the results for two different marine diesel engines: two-stroke (by MAN B&W type 7S80MC-C) and four-stroke (by Wartsila type SW 380). The experiment results obtained indicate that the use of the cross gain function allows us to determine the limit condition for a various type of injection pump.
Highlights
The International Maritime Organization (IMO) policies changes related to the global control of emissions included in the International Convention for the Prevention of Pollution from ships: MARPOL-Annex VI, followed by IMO 2020 Sulphur Limit compliance with the 1 January, 2020 deadline, forced ship owners/ managers to comply with the provisions of the Convention, but above all, had an impact on far-reaching consequences on shipping company operating costs, global freight rates, low sulfur fuels or scrubber demands, accelerated ship scrappage, and more
It is observed that the steadily deteriorating quality of fuel oils combined with increased content of catalytic additives used in the refining processes of crude oil, caused the problem of the deterioration of working conditions in fuel system precision pairs
According to the literature [1] and the author’s own experience, it has become significant, with respect to, accelerated wear occurring in the fuel injectors and injection pumps, and following, operational problems
Summary
The International Maritime Organization (IMO) policies changes related to the global control of emissions included in the International Convention for the Prevention of Pollution from ships: MARPOL-Annex VI, followed by IMO 2020 Sulphur Limit compliance with the 1 January, 2020 deadline, forced ship owners/ managers to comply with the provisions of the Convention, but above all, had an impact on far-reaching consequences on shipping company operating costs, global freight rates, low sulfur fuels or scrubber demands, accelerated ship scrappage, and more. According to the literature [1] and the author’s own experience, it has become significant, with respect to, accelerated wear occurring in the fuel injectors and injection pumps, and following, operational problems As it follows from an analysis of operational reports and author research [2,3] that damage to injection systems, apart from poor quality fuel, is caused by increasingly worsening quality of materials used for atomizers and spare parts of injection pumps (service life is almost half shorter compared to one or two decades ago). These defects result improperasfuel spray, or carbon deposit cylinder head, as shown in. SW 380 trunk piston engine (a), blow by damage of injector (b), and its seat in cylinder(c) head inthe thetwo-stroke two-stroke by Mitsubishi.
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