Showing papers by "Satish C. Sharma published in 2016"
TL;DR: In this article, a comparative study between textured surface and non-textured surface non-recessed hybrid journal bearing configurations is presented, and numerically simulated results show that the textured non-regressed journal bearing provides improved stability parameter than that of journal bearing with nontexturing.
66 citations
TL;DR: In this article, the effect of misalignment of journal in conjunction with geometric imperfections of journal on the performance of four pocket hybrid journal bearing system has been investigated and the numerically simulated results indicate that the performance gets significantly deteriorated due to the geometric imperfection and mis alignment of journal.
25 citations
TL;DR: In this article, the performance of hybrid circular thrust pad bearing with partial and full textured surface, operating with power law lubricant has been studied, and numerically simulated results reveal that among the different non-Newtonian lubricants, the dilatant one provides the minimum value of frictional power loss.
18 citations
TL;DR: In this paper, the Jakobsson-Floberg-Olsson (JFO) mass conservation algorithm has been used instead of the Reynolds boundary conditions to get an accurate prediction of the caviation regime.
Abstract: The present article proposes a technique to improve the performance of textured hydrostatic thrust bearings with the use of oil supply holes. The article provides a comparison between smooth and surface-textured hydrostatic thrust bearings. To get an accurate prediction of the caviation regime, the Jakobsson-Floberg-Olsson (JFO) mass conservation algorithm has been used instead of the Reynolds boundary conditions. It has been observed that surface texture results in a significant decrease in friction power loss along with an improvement in other performance parameters. The study also reveals that the location of the supply hole for the lubricant system significantly affects the bearing performance.
18 citations
01 Jul 2016
TL;DR: In this paper, the performance characteristics of a capillary compensated tilted pad hydrostatic bearing operating with Newtonian lubricant and cubic law lubricant were studied numerically considering the flexibilitability of the bearing.
Abstract: The performance characteristics of capillary compensated tilted pad hydrostatic bearing operating with Newtonian lubricant and cubic law lubricant are studied numerically considering the flexibilit...
15 citations
TL;DR: In this article, the micro-EHL behavior of seven different ionic liquids in textured surface of concentrated engineering contacts is discussed, including sinusoid, triangle and saw-tooth waveform with roughness amplitudes equal to asperity heights.
14 citations
TL;DR: In this article, a multiscale 3D Representative Volume Element approach is proposed for modeling the elastic behavior of carbon nanotubes reinforced composites with vacancy defects, which is based on the multi-scale 3D beam element approach.
6 citations
TL;DR: In this paper, the effect of a crack on the modal frequency of a draft pad was investigated, and it was shown that if the crack lies in the zone of minimum modal displacement, then the frequency drop is minimal, and if the cracked area lies in a zone of maximum modal displacements, then it is significant.
Abstract: The present work investigates the effect of a crack on the modal frequency of a draft pad. Initially, the first five mode shapes of a healthy draft pad and the first seven mode shapes of healthy draft gear considering compressed draft pads are determined using the finite element approach. A mathematical model of the draft pad is formulated to predict the effect of the crack on its modal frequency. A semi-elliptical shaped crack is modelled in the lateral and longitudinal direction of the draft pad. It is observed that if the crack lies in the zone of minimum modal displacement, then the frequency drop is minimal, and if the crack lies in the zone of maximum modal displacement, then the frequency drop is significant. Various damage scenarios are simulated by varying the width and aspect ratio of the crack in order to identify its effect on the modal frequency. It is seen that if the aspect ratio is varied while the crack’s width is maintained constant, then the frequency drop is linear, whereas if the crack’s width is varied while the aspect ratio is maintained constant, then the frequency drop is parabolic. This study provides a tool for monitoring exciting frequencies of draft gear and shows how each modal frequency is affected by the crack due to parameters like aspect ratio, crack width, and crack location/orientation.
4 citations