Showing papers by "Satish C. Sharma published in 2014"
TL;DR: In this article, the influence of the dimple geometry on hybrid thrust pad bearing and non-Newtonian lubricant was investigated using Finite Element Method (FEEM) and the results indicated that the values of load carrying capacity, frictional power loss, maximum pressure and fluid film stiffness coefficient are significantly affected by the behavior of lubricant.
55 citations
TL;DR: In this article, the influence of the tilt and recess shape on the static and dynamic performance characteristics of the hydrostatic thrust pad bearing system having Rabinowitsch fluid model lubricant was numerically analyzed.
35 citations
TL;DR: In this paper, the authors describe the development of a virtual freight wagon vehicle using virtual prototyping computer tools, which is considered as open type wagon "BOXN25" of Indian Railways.
35 citations
TL;DR: In this article, the effect of non-Newtonian lubricant on the stability of a worn hybrid journal bearing with a constant flow valve restrictor has been investigated by solving the nonlinear equation of motion for the journal center with the Runge-Kutta method.
35 citations
TL;DR: In this article, the Young's modulus of BNNT-based composites is evaluated using a 3D nanoscale representative volume element (RVE) based on continuum mechanics and using the finite element method (FEM).
14 citations
TL;DR: In this article, an Artificial Neural Network (ANN) based model has been developed for copper omega type mass flow sensor for phase shift prediction in which the significant phase shift parameter is modeled for various input factors like sensor location, drive frequency, mass flow rate and length of tube.
13 citations
01 Feb 2014
TL;DR: In this paper, a theoretical study of geometric imperfections of journal and its influence on the performance of capillary-compensated six-pocket hybrid journal bearing configurations with different geometric shapes of recess is presented.
Abstract: The present paper deals with the theoretical study of geometric imperfections of journal and its influence on the performance of capillary-compensated six-pocket hybrid journal bearing configurations with different geometric shapes of recess. The analysis includes the geometric imperfections of journal such as barrel shape, bellmouth shape, and circumferential undulations and various geometric shapes of recess (square, circular, elliptical, triangular) of same pocket area. The governing Reynolds equation is solved using Galerkin’s technique. The numerically simulated results indicate that the selection of suitable geometric shape of recess is important to have the least influence of different geometric imperfections of journal on the bearing performance.
13 citations
TL;DR: In this paper, the influence of micropolar lubrication on the stability of a constant flow valve compensated multi-recess conical hybrid journal bearing system has been investigated, and numerical simulated results indicate that the value of stability threshold speed margin gets increased substantially with the use of the viscous vis-a-vis Newtonian lubricant.
Abstract: The present paper investigates the influence of micropolar lubrication on the stability of a constant flow valve compensated multi-recess conical hybrid journal bearing system. Eringen's micropolar fluid theory has been used to model the micropolar lubrication in a fluid-film bearing system. The modified Reynolds equation of the micropolar lubricated bearing system has been solved using finite element method. Performance characteristics parameters of four pocket hybrid journal bearing system have been computed for the values of semi-cone angle 10°, 20° and for the judiciously selected micropolar parameters. Numerically simulated results indicate that the value of stability threshold speed margin gets increased substantially with the use of micropolar lubricant vis-a-vis Newtonian lubricant. Copyright © 2014 John Wiley & Sons, Ltd.
11 citations
TL;DR: In this article, the influence of wear on the performance of a capillary-compensated hole-entry hybrid misaligned journal bearing system operating in a turbulent regime is investigated.
Abstract: Purpose – The present work aimed to study analytically the influence of wear on the performance of a capillary-compensated hole-entry hybrid misaligned journal bearing system operating in a turbulent regime. The numerically simulated results are presented for the chosen values of restrictor design parameter, Reynolds numbers, wear depth and misalignment parameters. Design/methodology/approach – The wear caused on the bearing surface due to start/stop operations is modeled using the Dufrane’s abrasive wear model. The modified Reynolds equation based on Constantinescu’s lubrication theory is solved using finite element method together with capillary restrictor flow equation. Findings – It is found that the value of minimum fluid-film thickness increases significantly for a constant value of restrictor design parameter when unworn aligned bearing operates in turbulent regime vis-a-vis laminar regime. Further, it has also been observed that when a worn bearing operates in laminar/turbulent regimes, the reduct...
10 citations
TL;DR: In this paper, a generic capsule method is presented for stack up of geometrical tolerances of components and their assembly using graphical approach and the optimized cost has been calculated for the assembly.
10 citations
TL;DR: In this article, an adaptive neuro-fuzzy inference system (ANFIS) was used to predict the performance of mass flow sensor under varying operational conditions depending on the availability of the data and can be used as an alternative to the physical models.
TL;DR: In this paper, a premature failure of gear contact encountered in Exciter Sieve gear boxes has been identified by simulating the load bearing capacity of lubricants and conducting controlled experiments on an Amsler disk-on-disk tribo tester.
01 Jun 2014
TL;DR: In this article, the wheel-flat and a subsurface crack in the beneath is studied using FEA, and the wheel material is taken Elastic-plastic and J-Integral factor has been obtained.
TL;DR: In this article, the Young's modulus of BNNT based composites are evaluated using a 3-D nanoscale representative volume element based on continuum mechanics and using the finite element method (FEM).
Abstract: Boron nitride nanotubes (BNNTs) possess extremely high stiffness and strength and may provide the ultimate reinforcing materials for the development of nanocomposites. In this paper, the Young’s modulus of BNNT based composites are evaluated using a 3-D nanoscale representative volume element based on continuum mechanics (CM) and using the finite element method (FEM). Additionally, the suitability of the BNNTs reinforced polymeric composites as nanomechanical resonators, using CM based approach and FEM is illustrated in this paper. Analytical formulas based on CM are used to examine the mass sensitivity of single walled BNNT (SWBNNT) reinforced composite considered as a thin wall BNNT for different aspect ratios and volume fractions of BNNT in composites. The FEM analysis, considering SWBNNT as a transversely anisotropic material is performed and results are compared with the CM based approach. The results indicated that the mass sensitivity of SWBNNT reinforced composite based nanomechanical resonators can reach 10−3 fg and a logarithmically linear relationship exists between the resonant frequency and the attached mass, when mass is larger than 10−3 fg. The simulation results which have been obtained based on FEM are found to be in good agreement with the analytical approach used in this paper.
TL;DR: In this paper, an atomistic three dimensional (3D) space frame model of fixed-free single walled-boron nitride nanotube (SW-BNNT) based nanoresonator is developed.
Abstract: Sensor application for detection of acetone molecule(s) present in human breath is developed for cantilevered single walled-boron nitride nanotube (SW-BNNT) and analyzed in the present work. The same can be used for continuous monitoring of diabetes. Biocompatibility nature of BNNTs justify their use in biomedical applications. The possible use of the BNNT as nanomechanical resonators is explored in the present study. An atomistic three dimensional (3D) space frame model of fixed-free SW-BNNT-based nanoresonator is developed. The proposed model investigates the feasibility of SW-BNNT for sensing acetone molecules present in human breath for detecting diabetes. Dynamic analysis of fixed-free SW-BNNT for variable aspect ratios of nanotubes is carried out. Presence of acetone molecule(s) causes a shift in the resonant frequency of SW-BNNT. It is observed that this frequency shift is quite significant with presence of more acetone molecules and shows mass sensitivity of SW-BNNT toward acetone molecules. Continuum mechanics-based analytical approach has been used to validate the newly developed sensor equations as the results are found to be in close proximity. The result thus paves new path for the application of SW-BNNTs as biosensor for detection of acetone molecule(s) present in human breath.
TL;DR: In this article, a generic capsule method is presented for stack up of geometrical tolerances of components and their assembly using graphical approach and angularity tolerance has been considered for illustration of the methodology.