THE usual cases that occur in torsional vibration calculations are of the type shown in Fig. 1.
Teng‐Ko, L. (1938), "Torsional Vibration: A Formula Giving Close Approximations for Calculating Fundamental Frequencies", Aircraft Engineering and Aerospace Technology, Vol. 10 No. 3, pp. 76-76. https://doi.org/10.1108/eb030284
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