The issue of the indicator diagram analysis for the purpose of diagnosis of marine diesel engines

The article analyses the possibility of using the electronic type indicators, in the diagnosis of marine engines. The analysis of indicated parameters read from the indicator diagram is now widely use on ships in the diagnosis of marine engines. To make this possible, measuring indicated systems should meet a number of important requirements to be met to ensure the possibility of their diagnostic use. These include reliable determination of the top dead centre piston (TDC). The above is particularly important in in-depth analysis of indicator diagrams − calculating the heat release characteristics. The paper presents results of research on the effect of the error on the accuracy of the location of TDC (GMP) on calculated heat release characteristics. In order to demonstrate the impact positional error TDC, simulation study was conducted in which indicated diagrams was used, obtained on a medium-speed four-stroke marine engine type A25/30 and the low-speed two-stroke engine type RTA76, Sulzer Company