THE force couples, including moments due to inertia masses, which acting at different points on a crankshaft cause an elastic distortion, as a result of which points disposed in the axial plane are subject to an angular displacement in relation to one another in the form of a phase advance and retard movement, and it follows that each will possess a different degree of cyclic variation.
Beilschmidt, J.L. (1936), "Torsional Oscillation of Shafts: Describing a Procedure for Analysing Harmonic Elastic Distortion", Aircraft Engineering and Aerospace Technology, Vol. 8 No. 3, pp. 79-80. https://doi.org/10.1108/eb030025
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