Błędy montażu przyczyną nieszczelności gniazd zaworowych silników okrętowych

The paper presents utilization of simplified mathematical model of engine Sulzer 3AL 25/30 for prediction of impact of failure, load and rotational speed changes at fluctuation of instantaneous angular speed of the crankshaft. Simplified model omit torsional vibrations impact at angular speed instantaneous value. It was assumed than due to stiffness of three – cylinder engine shaft, angular deviations due to torsional vibrations are not considered. In order to obtain the value of tangential force at different loads, real values of in – cylinder pressure, measured by electronic indicators, were taken. Experiment was carried out at Sulzer 3AL 25/30 test bed. During experiment, measurements at loads of idle run, 50 kW, 100 kW, 150 kW and 200 kW were conducted. Results were presented in form of comparison graphs, which let to build diagnostic conclusions. Simulations are useful for evaluation and classification of real runs of instantaneous angular speed, measured using optical encoder ETNP-10.