Understanding contact between rough surfaces is of critical importance to the design of many engineering applications. Contact models rely on material properties and surface topography of the contacting surfaces as input parameters. Hence, the relevance of the contact models is dependent on their inherent assumptions and the accuracy with which the input parameters are determined. We have evaluated the difference between the surface topography parameters calculated with a statistical and deterministic approach for actual engineering surfaces. We have found topography values that change up to 300% depending on the method used, and attribute this to the stringent definition of an asperity-peak in the case of deterministic analysis as opposed to statistical analysis, which not only considers asperity-peaks but also asperity-shoulders.
COBISS.SI-ID: 14288923
The two-stage procedure for predicting the remaining useful life of the machines is demonstrated on a case of industrial shot blasting machine. In the first step the generalised Jensen-Reny divergence is calculated from filtered vibration signals. This index serves as a measure for the “distance” between the reference and current samples. In the same time the index is related to the size of progressing fault. In the second step the model of the index trend is calculated and the distribution of the first passage time (the time the index hit the critical value) is evaluated.
COBISS.SI-ID: 30278695
We studied the influence of topographic and material properties on the real contact area behavior for the contact of two flat surfaces. Deformable samples made of various materials and with different roughness were prepared and pressed in contact with rigid flat.
COBISS.SI-ID: 15105563