VII PTNSS Congress - 27th-29th June 2017
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THE IMPACT OF THE ACCURENCY OF INDICATOR DIAGRAMS ON THE HEAT RELEACE CHARACTERISTICS CALCULATION, USED IN THE DIAGNOSIS OF MARINE DIESEL ENGNE

The paper analyzes 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 vessels in the diagnosis of marine engines. The direct analysis of the characteristics feature indicator diagram and changes of indicated parameter values does not always allow on the formulation correct diagnostic conclusions. Even a few different defects can cause similar changes in the values of indicated parameters and shape indicator diagrams. Therefore this is recommended in-depth analysis of these graphs based on calculated heat release characteristics. To make this possible, measuring indicated systems should meet a number of important requirements in order 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 measured values. These also includes reliable determination of the top dead center piston (TDC). The paper presents results of research on the effect of the error on the accuracy of the location of TDC on calculated heat release characteristics. The above is particularly important in in-depth analysis of indicator diagrams - calculating the 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 diesel engine type A25/30 and the low-speed two-stroke marine diesel engine type RTA76, Sulzer company.
Topic: Combustion process control in engines
Author: Kazimierz Witkowski
Co-authors: