CASE STUDY ON THE IMPACT OF PISTON NODE MASS ON DIESEL ENGINE PERFORMANCE

Abstract

The study aims to analyze the importancethat have mass of the parts of the piston
node in the dynamics and performance of the diesel engine under study. To obtain the results,
the method of analytical study of the dynamics of the crank mechanism of the engine was used,
where the forces acting on the piston and the specific moment per unit of the piston surface
were determined. Calculations are performed for the actual mass of the piston node and for a
reduction in the mass of the piston node by 10% and increases by 10% and 20%. The results
show that for these measures, the change in motor torque is insensitive. In the case of a reduction
in performance up to 0.01%, and with an increase of mass to 20%, we have an increase in
performance by 0.02%. The influence of the mass of the piston node is pronounced on the
inertial forces. By reducing the mass of the piston node by 10%, we have a reduction in inertia
forces up to 11%, and by increasing the mass to 20%, we have an increase in inertia forces by
23%. This indicates that the dynamic loads on the piston pin on the rod bearing and on the
bearing journals of the crankshaft are greatly increased, therefore diesel engine repair specialists
must respect the dimensions of the piston node.