Described herein is an experimental and theoretical study of the dynamic properties of torsional viscous-friction dampers for use on Diesel engines and the characteristics of torsional vibration of the engine shaftings.
At first, three kinds of dampers are fitted to a 14.3 liter, V-type, 8-cylinder Diesel engine and the torsional vibration displacements at the pulley are measured in order to investigate the characteristics of torsional vibration of the shaftings with the damper. The kinematic viscosity of silicone oil is diversely varied in this experiment. It is confirmed that an optimum viscosity exists for each damper from an experimental viewpoint.
Next, the dynamic properties of the dampers and the characteristics of torsional vibrations of the engine shaftings are investigated by 3 dimensional analysis of forced vibration by the transfer matrix method, which has been developed by the authors.
Finally, the optimum conditions of the viscous-friction dampers for the engine are estimated by comparing the calculated results with the experimental ones. In addition to that, the dynamic properties of the silicone oil, that are necessary for damper design, are given and the characteristics of the torsional vibration of the engine shaftings are also estimated from an analytical viewpoint.