New machinery designs, new materials and new areas of application call for constant updating and calibration of design and classification Rules. In this paper an attempt is made to use mehtods developed within design rule development for load bearing structures for this purpose. The developed theory and mehthods, usually referred to as structures reliability theory, have made considerable advance during the last decade and are used both directly for design analysis and for code calibration. In the paper we show that the methods are equally applicable for development of design rules for marine propulsion systems. This is demonstrated through the calibration of a new method for the scuffing limit state in marine cylindrical-and bevel geras.
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