Simulation Of Torsional Vibration Research Articles

Modeling and Simulation of Torsional Vibration of the Compliant Sprocket in Balance Chain Drive Systems

Modeling and Simulation of Torsional Vibration of the Compliant Sprocket in Balance Chain Drive Systems

Characteristic Frequencies and Mode Shapes for TurboGenerator Shaft Torsional Vibrations

Fundamental to the study of turbogenerator shaft torsional vibrations, as occur in subsynchronous resonance and high speed reclosing, is the calculation of the characteristic frequencies and associated mode shapes of the vibrations. A calculation procedure is discussed which is based on distributed ed system concepts and does not require matrix eigenvalue-eigenvector routines as does the conventional method based on lumped inertia and compliance. The procedure is of value in the analysis and simulation of torsional vibrations.

クランク軸系のねじり振動波形のシミュレーション

The torsional vibrations in crankshaftings of high speed Diesel engines become more excessive with the increase of engine power. So it is necessary to improve accuracy in the calculation of torsional vibration amplitude especially resonant amplitude. It is usual to carry out harmonic analysis of resultant torque and estimate the resonant amplitude of each order vibration. On the other hand, it is not easy to calculate accurately resultant amplitude by taking the phase difference between each order vibration into consideration and summing up each order amplitude gained by the above-mentioned calculation. So in the present paper, authors try to calculate directly resultant amplitude by using a step by step transition matrix method. The simulation results for torsional vibrations of high speed Diesel engines are compared with similar results obtained by the conventional method and it is shown that transition matrix solutions are more accurate.At the same time, this paper refers to new experiments in searching for engine damping needed by the simulation of torsional vibration. And the obtained results are following;1) Engine damping ratio in small-sized high speed in-line Diesel engines is approximately 0.03-0.04.2) Engine damping capacity is subject to the influence of piston rings especially oil rings, but is not influenced by engine speed.