The subject of this note are tolerance averaged models. These models can be obtained either by the mode shape functions approach or the basis functions approach [1]. The aim of this contribution is to present a comparison between two simplest versions of such models, i.e. models based on only one shape function. In the case of the basis function approach such model is named in the note as the heuristic tolerance averaged model and in the case of the mode shape functions approach as the tolerance averaged mode shape model. As a comparison criterion is taken into account the problem of free-vibration of an unbounded two-layered laminate.
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