The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Monica Malvezzi - One of the best experts on this subject based on the ideXlab platform.
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Cold rolling mill process: a Numerical Procedure for industrial applications
Meccanica, 2008Co-Authors: Maria Cristina Valigi, Monica MalvezziAbstract:The paper proposes a model for a cold rolling mill process in the full-film regime that uses lubricant emulsion sprayed on at the entrance of the strip. The aim of the model is to forecast the reduction of strip thickness versus the flow rate of lubricant given the other operation parameters. The model includes strip plastic deformation, lubricant flow and lubricant viscosity depending on pressure. The mathematical problem is a free boundary one and a Numerical Procedure, applied to an industrial plant, is presented with some results.
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cold rolling mill process a Numerical Procedure for industrial applications
Meccanica, 2008Co-Authors: Maria Cristina Valigi, Monica MalvezziAbstract:The paper proposes a model for a cold rolling mill process in the full-film regime that uses lubricant emulsion sprayed on at the entrance of the strip. The aim of the model is to forecast the reduction of strip thickness versus the flow rate of lubricant given the other operation parameters. The model includes strip plastic deformation, lubricant flow and lubricant viscosity depending on pressure. The mathematical problem is a free boundary one and a Numerical Procedure, applied to an industrial plant, is presented with some results.
Maria Cristina Valigi - One of the best experts on this subject based on the ideXlab platform.
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Cold rolling mill process: a Numerical Procedure for industrial applications
Meccanica, 2008Co-Authors: Maria Cristina Valigi, Monica MalvezziAbstract:The paper proposes a model for a cold rolling mill process in the full-film regime that uses lubricant emulsion sprayed on at the entrance of the strip. The aim of the model is to forecast the reduction of strip thickness versus the flow rate of lubricant given the other operation parameters. The model includes strip plastic deformation, lubricant flow and lubricant viscosity depending on pressure. The mathematical problem is a free boundary one and a Numerical Procedure, applied to an industrial plant, is presented with some results.
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cold rolling mill process a Numerical Procedure for industrial applications
Meccanica, 2008Co-Authors: Maria Cristina Valigi, Monica MalvezziAbstract:The paper proposes a model for a cold rolling mill process in the full-film regime that uses lubricant emulsion sprayed on at the entrance of the strip. The aim of the model is to forecast the reduction of strip thickness versus the flow rate of lubricant given the other operation parameters. The model includes strip plastic deformation, lubricant flow and lubricant viscosity depending on pressure. The mathematical problem is a free boundary one and a Numerical Procedure, applied to an industrial plant, is presented with some results.
Abdel-hakim Bouzid - One of the best experts on this subject based on the ideXlab platform.
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An Experimental-Numerical Procedure for Stuffing Box Packing Characterization and Leak Tests
Journal of Tribology-transactions of The Asme, 2010Co-Authors: Mohammed Diany, Abdel-hakim BouzidAbstract:The sealing of valve stems is ensured by the traditional systems of packed stuffing boxes. The performance of this type of sealing system, which is also used in rotating equipment, is dependent on the radial contact pressures generated by the packing axial compression. The mechanical behavior of a packing seal is characterized by the transmission ratio of the radial stress over the axial stress known as the lateral pressure coefficient, which is one of the required parameters used to select packing seals. However, the modeling of the packed stuffing box requires the knowledge of other packing seal mechanical characteristics such as compression modulus and Poisson's ratio. In this paper, the mechanical characteristics of packing seals are obtained using a hybrid experimental-Numerical Procedure. The experimental study is carried out on an instrumented stuffing box packing test bench. The tests results of the experiments are coupled to the ones obtained by a finite element simulation of the test rig to determine the packing seal mechanical characteristics. Two packing types are used: one based on Teflon and the other one based on flexible graphite. In addition, leak rates are measured.for different axial compressive stresses and gas pressures in order to estimate the tightness performance of such seals.
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An Experimental-Numerical Procedure for Stuffing Box Packing Characterization
ASME 2010 Pressure Vessels and Piping Conference: Volume 2, 2010Co-Authors: Mohammed Diany, Abdel-hakim BouzidAbstract:The sealing of valve stems is ensured by the traditional systems of packed stuffing boxes. The performance of this type of sealing system used also in rotating equipment is dependent on the radial contact pressures generated by the packing axial compression. The mechanical behavior of a packing seal is characterized by the transmission ratio of the axial stress over the radial stress known as the lateral pressure coefficient which is one of the required characteristic used to select packing seals. However, the modeling of the packed stuffing box requires the knowledge of some mechanical characteristics other than the lateral pressure coefficient. In this paper, the mechanical characteristics of packing seals are obtained using a hybrid experimental-Numerical Procedure. The experimental study is carried out on an instrumented stuffing box packing test bench. The tests results of the experiments are coupled to the ones obtained by a finite element simulation of the test rig to determine the packing seal mechanical characteristics. Two packing types are used; one based on Teflon and the other one based on flexible graphite.Copyright © 2010 by ASME
Radostina P. Tasheva - One of the best experts on this subject based on the ideXlab platform.
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Computer Simulations for Stability Analysis of a Numerical Procedure for Crossbar Packet Switch
Information Technologies and Control, 2017Co-Authors: Tasho Tashev, Vladimir Monov, Radostina P. TashevaAbstract:Abstract The paper is concerned with the problem of calculating the bound of the throughput (THR) of a crossbar packet switch. For this purpose a suitable Numerical Procedure is used. The input data for the Procedure are the results of computer simulations executed on a grid-computational structure (www.hpc.acad.bg). The modeling of the THR uses MiMa-algorithm for a crossbar packet switch, specified by the apparatus of Generalized Nets. For studying the stability of the Numerical Procedure we use a modified family of patterns for i.i.d. Bernoulli uniform load traffic simulation. The obtained results show that the Numerical Procedure is stable which means that small input perturbations result in small changes in the output.
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NAA - High Performance Computations for Study the Stability of a Numerical Procedure for Crossbar Switch Node
Lecture Notes in Computer Science, 2017Co-Authors: Tasho Tashev, Vladimir Monov, Radostina P. TashevaAbstract:In the present paper the problem concerning computation of the upper bound of the throughput (THR) of crossbar switch node is formulated. The task is solved using an appropriate Numerical Procedure. The input data for this Procedure are the results of high performance simulations executed on the grid-structure of the IICT-BAS (www.grid.bas.bg). The modeling of the THR utilizes MiMa-algorithm for a node with \((n\times n)\) commutation field, specified by the Generalized Nets. For studying the stability of the Numerical Procedure we use a modified family of patterns for hotspot load traffic simulation. The obtained results give an upper bound of the THR for \(n\in [3,97]\) which enables us to estimate the limit of the THR for \(n\rightarrow \infty .\) This estimate is obtained to be \(100\%\) for the applied family of patterns. The Numerical Procedure is stable (small input perturbations lead to small changes in the output).
Raquel Ghini - One of the best experts on this subject based on the ideXlab platform.
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Numerical Procedure for estimating temperature in solarized soils
Pesquisa Agropecuária Brasileira, 2006Co-Authors: Chigueru Tiba, Raquel GhiniAbstract:The objective of this work was to develop a simplified Numerical Procedure for the estimation of accumulated monthly hours of solarized soil temperatures. The proposed model requires monthly means of daily solar radiation and maximum air temperature as input data, and a daily pattern of temperature variation assumed to be sine-shaped. The Procedure was verified using observations made during the years 1992 and 1993 in Jaguariuna, SP. The proposed Procedure can predict monthly temperature hours at 10 cm depth in the solarized soil, with acceptable accuracy, in the region for which it was developed.
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Notas Científicas Numerical Procedure for estimating temperature in solarized soils
2006Co-Authors: Chigueru Tiba, Raquel GhiniAbstract:The objective of this work was to develop a simplified Numerical Procedure for the estimation of accumulated monthly hours of solarized soil temperatures. The proposed model requires monthly means of daily solar radiation and maximum air temperature as input data, and a daily pattern of temperature variation assumed to be sine-shaped. The Procedure was verified using observations made during the years 1992 and 1993 in Jaguariuna, SP. The proposed Procedure can predict monthly temperature hours at 10 cm depth in the solarized soil, with acceptable accuracy, in the region for which it was developed.
