The torsional vibration calculation (TVC) of new marine installations (propeller driven by diesel engines) is requested by the Classification Societies. The aim of this paper is to shortly introduce the basic knowledge of TVC, to present the validation process of the model and parameters (stiffness, inertia, excitation and damping) and the PC program used at Wa¨rtsila¨ (example of calculation including comparison with measurement). Moreover, the special situation regarding the admissible limits of the torsional stresses given by the Classification Societies is shown (different limits between various societies, for given intermediate and propeller shafts). A proposal to harmonize these limits is presented.

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