MACHINE MODELING AND SIMULATIONS, Machine modeling and simulations 2020

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Application of torsional dampers for reducing torsional vibrations in shafts of piston aircraft engines
Jacek Jackiewicz

Last modified: 17. 08. 2020

Abstract


Not only in the working environment of mechanical engineers it is a well-known fact that piston engines shake, some more than others. Vibrations that are created by piston engines have to be controlled somehow, and this is the reason why torsional dampers are applied for reducing torsional vibrations in shafts of these type of engines.
Crankshaft vibrations are intrinsic in any internal combustion engine because of the powerful though unequal forces, which act directly on the crankshaft. Although dampers will not add engine horsepower, no use of them causes that crankshaft vibrations will hamper the horsepower potential of engines.
In recent times magnetorheological dampers have been used more and more often. It is worth noting, however, that the design simplicity of this type of dampers is usually ransomed by the need to use advanced technologies both in the design of elements of the control system as well as composing fluids that fill them.
The main purpose of this research is to conduct computer simulations of the selection of settings for semi-active vibration control by the use of such dampers in order to increase the fatigue durability of shafts. The special control strategies are proposed for the minimization of torsional vibration amplitudes.