Piston skirt surface topographies during a low wear process were analysed. The tendencies of parameter changes were studied. It was found that during the wear process one-directional random structures were superimposed on the machined piston skirt surface topographies. On the basis of this observation, a method of piston skirt surface topography modelling during engine operating was proposed. Piston skirt axial two-dimensional (2D) profiles and 3D surface topographies were simulated. The imposition of a computer-generated random surface with a Gaussian ordinate distribution on the machined piston skirt surface is the idea of the proposed method. The worn piston surface could be modelled when its maximum height was known. The obtained results of this modelling type were compared with a simple truncation model. The matching criteria of real and simulated surface topographies were presented with the results of the model accuracy assessment.
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