THE INFLUENCE OF THE TECHNICAL CONDITION OF THE ELEMENTS OF THE OIL SYSTEM OF THE D246.4 HIGH SPEED DIESEL ON THE PARAMETERS OF PULSATION OF THE ENGINE OIL PRESSURE

Abstract

The issue of increasing the efficiency of ship power plant operation today, in particular, lies in the area of increasing the operational reliability of internal combustion engines. This, in turn, requires them to be equipped with continuous diagnostic systems in order to be able to detect malfunctions at early stages and detect violations of operating conditions caused by the human factor. The trouble-free operation of ship engines largely depends on the serviceability of the crank-and-connecting mechanism (CCM), the loss of which leads to the shutdown of the entire power plant, and in the case of its use as the main engine, then to the loss of movement of the ship. The complexity of the geometric (constructive) and operational parameters of the crank mechanism and the lack of clearly defined relationships between them complicates the diagnosis process and leads to the need to use non-direct diagnostic methods. This requires conducting research on the impact of deviations in the performance indicators of lubrication system elements and bearing units on the output signal. Today, the most effective method of such research is the use of specialized software packages, among which GT-ISE from Gamma Technologies (USA) and AVL from Advanced Simulation Technologies (Austria). In order to identify the interrelationships between the technical conditions of the elements of the cleaning supply circuit of the lubrication system of the D246.4 diesel engine, a study was conducted using computer modeling. We used the results of bench research as the initial parameters of the elements of the studied circuit. A detailed description of the construction of the computer 1-D model, the parameters of the studied elements and the conditions of the research are given. The results of the conducted studies of pressure pulsations and changes in productivity in the objects of the engine oil supply and cleaning circuit indicate that the most informative parameter for diagnosing malfunctions and failures is the frequency analysis of pressure pulsations based on the monitoring of harmonics of pressure pulsations. The performance of the oil pump and spool-type safety valve should be evaluated by the nature of pressure pulsations corresponding to harmonics with an order equal to twice the number of gear teeth of the oil pump. Further research in order to determine changes in the performance of sliding bearings must be carried out taking into account the geometric features of the oil channels and, accordingly, the bearing units