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Kalender M.Y.,Industrial Training Institute | Zaffan H.A.,Helwan University | Dadoura H.H.,Helwan University
Journal of Engineering and Applied Science | Year: 2012

Friction noise responses of automotive brake pad composite materials containing different ingredients of reinforcement fibers were investigated to analyze their effect on friction stability. This friction material is composed namely of; resin matrix, reinforcement fibers, filling powders with surface dry lubricants and frictional additives. Rock wool fibers were added at different ratios to frictional composite material as a reinforcement to improve its frictional behavior and friction acoustic noise in accordance with wear rate stability. A Pin-On-Disc Tester, Sound Level Meter "SLM", and PC MATLAB program have been used to analyze the performance of the tested composite samples using the near field technique measurements of friction noise response. The results obtained of this experimental investigation illustrated that these advanced friction composite materials, which provided to be used as a braking material in automotive applications. Furthermore, high ingredients of rock wool fibers can be used to improve the frictional stability and emission level of the material friction process, while significant signal attenuation has been generated in the high frictional temperature range for high fiber concentrations. Source


Panigrahy R.K.,Industrial Training Institute
Proceedings of 2011 International Conference on Process Automation, Control and Computing, PACC 2011 | Year: 2011

In this paper the integration of MES with Hot Strip Mill, basing on the layer concept IT landscape for automation in RSP (Rourkela Steel Plant) is discussed. Dressing of order, Preparation of product schedule, manufacturing operation, Logging of process data for metallurgical tracking, inspection and testing, dispatch management and performance analysis are discussed. A one dimensional slab temperature distribution online model is proposed which will optimize the set point function against the variation of rolling speed. © 2011 IEEE. Source


Badruddin I.A.,University of Malaya | Al-Rashed A.A.A.A.,Industrial Training Institute | Salman Ahmed N.J.,University of Malaya | Kamangar S.,University of Malaya
International Journal of Heat and Mass Transfer | Year: 2012

The current study is focused to analyze the heat transfer characteristics in a porous duct. The mathematical model of heat transfer in a porous duct was solved by converting the governing partial differential equations into a set of algebraic equations with the help of finite element method. A simple three noded triangular element is used to mesh the duct domain. The current problem consists of a square duct with outer walls being exposed to hot temperature T h, and inner walls subjected to cool temperature T c. Emphasis is given to investigate the effect of width ratio of cavity on heat and fluid flow characteristics inside the porous medium. The results are reported for various duct width ratios, Rayleigh number etc. It is found that the Nusselt number increases with increase in height of cavity along the vertical walls of duct; however the Nusselt number for certain values of duct ratio oscillates along the width of the porous medium at bottom wall of the cavity. © 2011 Elsevier Ltd. All rights reserved. Source


Badruddin I.A.,University of Malaya | Al-Rashed A.A.A.A.,Industrial Training Institute | Ahmed N.J.S.,University of Malaya | Kamangar S.,University of Malaya | Jeevan K.,University of Malaya
International Journal of Heat and Mass Transfer | Year: 2012

The current study is focused to investigate the natural convective heat transfer characteristics in a porous square annulus. Finite element method is used as a tool to simplify the partial differential equations that govern the heat and fluid flow characteristics inside the porous medium. A simple three noded triangular element is used to divide the porous domain into smaller segments known as elements. The algebraic set of equations resulting from the finite element equation are assembled into a global matrix and then solved iteratively to get the solution variables. Thermal equilibrium as well as non equilibrium in porous domain is considered. The effect of various geometric and physical parameters are investigated. The boundary conditions are such that the inner walls of the annulus are heated isothermally to temperature T h, and the outer surfaces are exposed to cool temperature T c. The width ratio defined as the ratio of hollow portion to the length of the cavity is varied from 0.125 to 0.875. Results are discussed with respect to width ratio, Rayleigh number, radiation parameter and viscous dissipation parameter. © 2012 Elsevier Ltd. All rights reserved. Source


Al-Rashed A.A.A.A.,Industrial Training Institute | Badruddin I.A.,University of Malaya
International Journal of Mechanical and Materials Engineering | Year: 2012

The current work is undertaken to analyze the movement of fluid and thermal energy due to uneven heating of a porous medium confined in a cavity. The emphasis is given to heating at one of the vertical wall of the cavity with non-uniform temperature which leads to lesser amount of heat content at lower section of the porous medium as compared to that of upper section. The boundary conditions are maintained in such way to heat the left vertical surface of the cavity unevenly with power law coefficient λ. Two distinct cases are evaluated corresponding to different conditions at left and top wall. Case I belongs to the condition when the top and right wall is cooled to temperature T c. The bottom horizontal surface of cavity is adiabatic. Case II is such that the top wall is cooled to temperature T c but the right and bottom wall are adiabatic. Current numerical scheme is based on finite element method that yields the solution to know the temperature and velocity distribution in the domain. It is found that the Nusselt number is generally higher at the upper portion of the cavity. For λ=0 the heat transfer rate found to decrease continuously until 85% of the cavity height and then starts to increase. For λ=0.33 and 1, it is revealed that the thermal energy penetration into the depth of porous medium has increased due to insulating the right wall of the cavity. Source

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