Reduction of the amplitudes of selected components of the frequency spectrum of momentary velocity of the crankshaft of the internal combustion engine piston through the use of torsional vibration dampers

In this study, measures were taken to eliminate the negative effects of mechanical vibrations of a multicylinder internal combustion engine by reducing the amplitude of selected components of the frequency spectrum of momentary velocity of the engine crankshaft. For this purpose, experimental tests were carried out combustion piston engine, which was not originally equipped with a torsional vibration damper. On the basis of theoretical calculations were prepared three versions of hyper viscous torsional vibration dampers. Then were conducted experimental studies of engine built into the vehicle in which the engine had to be operated. For the measurement of momentary angular velocity of the crankshaft uses a laser vibrometer Polytec RLV-5500. The studies confirmed the usefulness prepared torsional vibration dampers to reduce selected components of the frequency spectrum of the signal instantaneous changes in the angular velocity of the crankshaft.