Abstract
The paper analyzes the possibility to use the electronic type indicators in the diagnosis of marine engines. It has been shown that in-depth analysis of indicator diagrams would be useful – calculation of heat release characteristics. To make this possible, measuring indicated systems should meet a number of important requirements in or-der to ensure that they can be used for the diagnostic purposes. These includes: high precision sensors for the measurement of cylinder pressure, high speed and accuracy of measuring and recording of measured values. These also includes reliable determination of the top dead center piston (TDC). In order to demonstrate the impact of positional error TDC, simulation study was conducted in which indicated diagrams were used, obtained on a medium-speed four-stroke marine diesel engine type A25/30 and the low-speed two-stroke marine diesel engine type RTA76, Sulzer company.
Highlights
Nowadays many marine engine-rooms are equipped with portable or stationary electronic indicators
The analysis shows, that on the accuracy of the calculated heat release characteristics has a piston top dead center piston (TDC) location error on the indicator diagram
In order to demonstrate the error of the impact positional TDC, simulation study was conducted in which was used indicated diagrams obtained on a medium-speed four-stroke marine engine type A25/30 and the low-speed twostroke engine type RTA76, Sulzer company, in the operating of the ship
Summary
Nowadays many marine engine-rooms are equipped with portable or stationary electronic indicators. Measuring systems destined for indication should meet a number of important requirements to be met to ensure the possibility of their diagnostic use These includes: high precision sensors for the measurement of cylinder pressure, high speed and accuracy of measuring and recording of measured values, a reliable determination of the top dead center piston (TDC). Diagnostician is the ship's mechanic, who by analyzing changes in the measured parameters relative to their reference values, tries to determine the type of damage. Such action is subjective and usually inefficient, depending on the knowledge and experience of the marine engineer [5, 12, 13]
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