Piston skirt surface topography modelling during a low wear process

Abstract

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.

Wear of a rough disc in dry sliding contact with a smooth ball: experiment and modeling

“…During mild wear, this surface became smoother with time [9]. Therefore, the imposition of smooth Gaussian surface topography on the machined surface seems to be a better solution than the truncation model [10][11][12][13][14][15][16][17]. The imposed surface is typically modeled.…”

“…The extension of this approach can be used when the number of processes is higher than two [14]. This method was used to simulate a low wear of the cylinder surface [15], of piston skirt surface [16], and of surface with isolated oil pockets [17]. In the last case, the modeled surfaces were correctly matched to the measured surfaces in 90% of analyzed cases.…”

Proposal of frequency‐based decomposition approach for minimization of errors in surface texture parameter calculation

“…30 Characterization of ST with frequency-representative Fourier transform was proposed with wavelet decomposition, 31 full frequency denoising technique based on wavelet decomposition, 32 autocorrelation approaches (e.g., autocorrelation function [AF]) 33 or Fourier reduction or random phase exclusion methods. 34 Many papers are referred to the cylinder liners and piston skirts assemblies 35,36 and assessments 37,38 Amplitude of NS (also referred to the measurement noise amplitude or shortly noise amplitude) can be directly specified by calculation of discrepancy from two measured details-results of two type of measuring with the same method. In other words, NS can be precisely defined by subtracting two results of measurement.…”

“…Many papers are referred to the cylinder liners and piston skirts assemblies 35,36 and assessments 37,38 of its surface qualities. Notwithstanding, the effect of both measurement frequency‐defined errors and procedures of its minimization on ST parameter calculation was not compressively studied.…”

Incorporation of deformation in a lubrication analysis for automotive piston skirt–liner system

“…Wang et al 27,28 developed a thermal model of mixed lubrication in point contact and showed that the non-Gaussian surface parameters have a large effect on the contact parameters. Krzyzak and Pawlus 29 analyzed piston skirt surface topographies during a low-wear process.…”