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Characteristics of Torsional Vibrations of a Shaft System with Parallel Misalignment

Abstract Couplings are important parts in the movement of a shaft system. A coupling can transfer the torque from one shaft to another through deforming itself. If parallel misalignment exists, the couplings will produce an extra deformation besides the deformation produced by transferring the torque. The exciting moment with one-time rotating frequency produced by this extra deformation is analysed in this article. This moment will result in torsional vibration at one-time rotating frequency. By use of DK-II torsional vibration measurement system, an experimental study of torsional vibrational behaviour in a parallel misalignment shaft system is carried out. The experimental results support the conclusion of analysis.