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In the wear and tear process of synovial joints, wear particles generated and released from articular cartilage within the joints have surface topography and mechanical property which can be used to reveal wear conditions. Three-dimensional (3D) particle images acquired using laser scanning confocal microscopy (LSCM) contain appropriate surface information for quantitatively characterizing the surface...
Osteoarthritis (OA) is one of the most common degenerative wear diseases of knee joints worldwide. Within knee joint articular cartilage (AC), collagen structure losing integrity is a major symptom of OA. Based on the development of laser scanning confocal microscopy (LSCM), AC images containing three-dimensional (3D) surface texture information could be obtained for quantitative analysis using numerical...
A numerical simulation has been used to systematically investigate the characteristics of a stylus surface profiling instrument. The model bridges together previously used concepts to incorporate both tip size and tip dynamics. The dynamics incorporate a tip flight phenomenon, inferring detachment from zero value of the reaction force and the trajectory from a free vibration solution to a second order...
This paper presents a fast modified three-dimensional flow model deduced from the Darcy equation and the modified Reynolds equation. The finite element method is used to discretize both equations so that only one nonlinear final set of equations is to be solved for finding the pressures in the gas film and porous matrix instead of two nonlinear sets of equations in the literature. In general, the...
A non-linear model based on the finite element method for the stability analysis of air thrust bearings is presented. This method may be applied to various types of geometrical and supply situations. This approach was applied to obtain the stability range of circular thrust bearings and the numerical results were compared with analytical predictions and experimental results. It is shown that the calculated...
This paper presents a quasi-analytical method allowing an easy and rapid estimation of the static and dynamic properties of recessed hybrid journal bearings, under linear pressure profile conditions on axial and inter-recess flow lands. The theory of small perturbations applied to position and velocity is used to evaluate the dynamic coefficients of journal bearings at concentric or eccentric positions...
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