Abstract
Contemporary diagnostic methods for ship engines: a report on scientific research activity of Polish Naval Academy in this field This paper devoted to ship combustion engine diagnostics, presents short characteristics of experimental test techniques applicable to state assessment of piston and gas turbine engines presently being in use in Polish Navy. Some metrological and organizational aspects of realization of necessary diagnostic tests as well as measurements of control parameters of engines of low susceptibility to control, were highlighted. Such engines are installed a.o. on board American origin frigates of Oliver Hazard Perry type as well as Norwegian origin submarines of Kobben type which have been recently incorporated into Polish Navy (i.e.General Electric turbine engines, Detroit Diesel and Mercedes Benz piston engines), as well as older engines of Russian production (Zorya turbine engines, Zvezda piston engines). Applicability of particular diagnostic methods was also assessed from the point of view of their effectiveness in identifying engine failures in conditions of its operation in ship power plant. Recently realized tests have made it possible to conduct operation of all piston and turbine engines used on board Polish Navy ships in accordance with their current technical state. On the average 120-130 diagnostic expertises are yearly issued, and the carried-out tests cover main functional systems of engines together with their control and safety subsystems.
Highlights
Main research activity of the Institute of Ship Construction and Operation (IKiEO), Polish Naval Academy (AMW), is focused on the problems of diagnostics of ship combustion engines
Introduction to Polish Navy, in recent years, driving engines of a new type of low susceptibility to control, makes it necessary to search for new, alternative diagnostic methods providing possibility of carrying out a complex assessment of technical state of the engines independently from very expensive servicing
In this paper is described the range of scientific research undertaken in the Institute, which have been traditionally focused on the area of operation of ship machines and devices, including a.o. development of assessment methods of technical state of ship engines being in service conditions on board a ship
Summary
Periodic assessment of technical state of the engines is realized by an experienced research team specialized in application of the newest methods of diagnosing in difficult conditions of ship operation. Realization of such tests is based on successive indication of engine cylinders during its steady operation under load within representative ranges. It often happens that trend curve of exhaust gas temperature changes only slightly deflects whereas piston head becomes burned through due to an injector failure In such cases the only possibility to obtain any diagnosis of technical state of engine is ensured by visual inspection of its internal spaces with the use of endoscopes (elastic fibrescopes and stiff borescopes). Selected defects of ship engines identified during endoscopic tests in service conditions have been systematically published in scientfic journals, a.o. in [8,14,23]
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