EFFECTS OF THE NUMBER OF CYLINDERS ON CRANKSHAFTS INERTIAS TORTIONAL VIBRATIONS

Abstract

Many researches that deal with the torsional vibrations phenomenon in crankshafts are considered constant inertias connected to sections of mass less shafting taking into account variation effects of torques only on crank units during running. In reality, crank mechanism with slider piston vibrates with varying inertias and this will lead to additional torsional vibrations depending on the number of cylinders in internal combustion engines. In this research, inertias of crank mechanisms with different number of cylinders are studied. By solving the ordinary differential equation of torsional vibrations caused by inertia continuous deviation using mathematica and matlab computer programs, graphs of crankshafts torsional oscillation was sketched to compare among torsional vibrations of different internal combustion engines with different number of cylinders.