Simulation and validation of crankshaft speed fluctuations

In this study, the simulation and validation of crankshaft speed fluctuations were performed by creating a dynamic model of a single cylinder four-stroke diesel engine. The dynamic model created includes internal gas pressure forces, hydrodynamic and dry friction forces, mass inertia moments of moving parts, starting torque and external load moment. Pressure data from a single cylinder diesel engine were used in the analysis. Taylor's serial method was used to solve the mathematical model and a simulation program was prepared in MATLAB programming language. The results obtained from the simulation program created were compared with the experimental data obtained from a single cylinder diesel engine. Experimental data and numerical solution were found to be quite similar. In addition, in the simulation program developed, the effects of different engine speeds, connecting rod mass inertia moment, mass inertia moment of rotating parts, friction, different indicating mean pressures and piston mass on crankshaft speed fluctuations were investigated. As a result, it has been determined that an internal combustion engine can be used to predict speed fluctuations and to reduce these fluctuations.