Pack System

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Sabeur Mezghani - One of the best experts on this subject based on the ideXlab platform.

  • Tribological performances of elliptic and circular texture patterns produced by innovative honing process
    Tribology International, 2016
    Co-Authors: Mohamed Yousfi, Sabeur Mezghani, Ibrahim Demirci, Mohamed El Mansori
    Abstract:

    Honing is a manufacturing process which uses friction and abrasion mechanisms at a reduced velocity to print a multiscale and anisotropic texture on the liner surface of automotive engines. It enables to enhance the functional performances of a ring-Pack System. However, industrial honing basically generates cross-hatched rectilinear textures. This paper proposes new surface textures, generatedby an innovative honing prototype machine, with original patterns (circles and ellipses) at different size and aspect ratio. Then, the friction performances of each generated surface are evaluated using a reciprocating ring–liner tribometer and compared with industrial helical slide honed (HSH) texture. The results show that ellipse patterns oriented at ring sliding direction contribute the most to reduce the friction coefficient.

  • Mutual Effect of Groove Size and Anisotropy of Cylinder Liner Honed Textures on Engine Performances
    Advanced Materials Research, 2014
    Co-Authors: Mohammed Yousfi, Sabeur Mezghani, I. Demirci, Mohamed El Mansori
    Abstract:

    The cylinder liner surface texture, widely generated by the honing technique, contributes a lot on engine functional performances (friction, oil consumption, running-in, wear etc.). In order to improve these functional performances, different honing processes are being developed. These different honing processes generate surfaces with various texture features characteristics (roughness, valleys depth, valley width, cross hatch angle, etc.). This paper addresses a comparison of ring-Pack friction for cylinder texture with different cross-hatch angles and valley sizes. It takes in consideration the mutual effect of valley depth and honing angle. A numerical model is developed to predict friction within the cylinder ring-Pack System in mixed lubrication regime and a morphological method is used to characterize groove depth. The results show the effect of different honing variables (rotation speed, stroke speed and indentation pressure) on cylinder bore surface textures and hydrodynamic friction of the ring-Pack System.

  • Influence de l'échelle de rugosité sur le frottement dans les contacts lubrifiés.
    2013
    Co-Authors: Ibrahim Demirci, Sabeur Mezghani, Hassan Zahouani, Mohamed Yousfi, Mohamed El Mansori
    Abstract:

    The reduction of friction and the limitation of emissions of greenhouse gases are the main objectives of the automotive industry. This energy e ciency is related to functionalization of the surface of ringPack tribo-System. Multi-stage abrasive nishing process are commonly used to produce the geometrical properties of a surface. This confers technical some functionalities in the operating characteristics relating to their durability and reliability. The texture generated signi cantly a ects the performance of the ring-Pack System. In this paper, a numerical model of elasto-hydrodynamic (EHD) contact coupled to a multiscale surface texture modeling was developed. This permtis to to study the scale e ect of surface features and theirs interactions on friction performance and lubricant ow under hydrodynamic lubrication condition. Surface topography can be decomposed in two principal components : super cial roughness modeled using fractal model and valleys modeled by scaling factor. Results show Relationship between friction and surface scales.

  • Mutual influence of cross hatch angle and superficial roughness of honed surfaces on friction in ring-Pack tribo-System
    Tribology International, 2013
    Co-Authors: Sabeur Mezghani, Ibrahim Demirci, Mohamed El Mansori, Mohammed Yousfi
    Abstract:

    The cylinder bore surface texture, widely produced by the honing technique, is an essential factor for a good engine performance (friction, oil consumption, running-in, wear etc.). This explains the improvement and development of various new honing techniques. These different honing processes generate surfaces with various texture features characteristics (roughness, valleys depth, cross hatch angle, etc.). This paper addresses a comparison of ring-Pack friction for cylinder surfaces produced by plateau honing and helical slide honing. It takes in consideration the mutual effect of superficial plateau roughness amplitude and honing angle. A numerical model is developed to predict friction within the cylinder ring-Pack System in mixed lubrication regime. The results show the effectiveness of helical slide honed surface texture in comparison to plateau honed bore surfaces

  • Energy efficiency optimization of engine by frictional reduction of functional surfaces of cylinder ring-Pack System
    TRIBOLOGY INTERNATIONAL, 2013
    Co-Authors: Sabeur Mezghani, Ibrahim Demirci, Mohamed El Mansori, Hassan Zahouani
    Abstract:

    Friction reduction, lower oil consumption, and limitation of greenhouse gases emissions are the chief objectives of the automotive industry in order to improve the environmental efficiency of vehicle engines. In this paper, a strategy for ring-Pack friction reduction through cylinder liner finish optimization based on coupling instrumented honing experiments and numerical prediction of elastohydrodynamic friction is proposed. The results show that honed surfaces produced by fine abrasion by honing stones yield the optimal elastohydrodynamic friction. They also demonstrate the limitations of ISO 13565 standard roughness parameters in giving a complete description of the functional performances of cylinder surface finishes.

Ali Kazemi - One of the best experts on this subject based on the ideXlab platform.

  • Temperature Increase during Different Post Space Preparation Systems: An In Vitro Study
    2016
    Co-Authors: Kiumars Nazari Moghadam, Shahria Shahab, Soghra Shirvani, Ali Kazemi
    Abstract:

    INTRODUCTION: The purpose of this study was to evaluate external root surface temperature rise during post space preparation using LA Axxess bur, Beefill Pack System, and Peeso Reamer drill. MATERIALS AND METHODS: The distal canals of forty-five extracted human permanent mandibular first molars were instrumented in crown-apical manner and obturated with latera

  • Temperature Increase during Different Post Space Preparation Systems: An In Vitro Study.
    Iranian endodontic journal, 2011
    Co-Authors: Kiumars Nazari Moghadam, Soghra Shirvani, Shahriar Shahab, Ali Kazemi
    Abstract:

      The purpose of this study was to evaluate external root surface temperature rise during post space preparation using LA Axxess bur, Beefill Pack System, and Peeso Reamer drill. The distal canals of forty-five extracted human permanent mandibular first molars were instrumented in crown-apical manner and obturated with lateral condensation technique. Teeth were then randomly divided into three groups according to post space preparation technique including: group 1. LA Axxess bur (Sybronendo Co., CA, USA), group 2 Beefill Pack System (VD W Co., Munich, Germany) and group 3 Peeso Reamer drill (Mani Co., Tochigi-ken, Japan). Temperature was measured by means of digital thermometer MT-405 (Comercio Co., Sao Paulo, Brazil) which was installed on the root surfaces. Data was collected and submitted to one-way ANOVA and Post hoc analysis. Root surface temperatures were found to be significantly higher (7.3±2.7 vs. 4.3±2.1 and 4±2.4,) in samples of Beefill Pack System compared with the two other groups (P<0.02). Using Beefill Pack System during post space preparation may be potentially hazardous for periodontal tissues.

Mohamed El Mansori - One of the best experts on this subject based on the ideXlab platform.

  • Tribological performances of elliptic and circular texture patterns produced by innovative honing process
    Tribology International, 2016
    Co-Authors: Mohamed Yousfi, Sabeur Mezghani, Ibrahim Demirci, Mohamed El Mansori
    Abstract:

    Honing is a manufacturing process which uses friction and abrasion mechanisms at a reduced velocity to print a multiscale and anisotropic texture on the liner surface of automotive engines. It enables to enhance the functional performances of a ring-Pack System. However, industrial honing basically generates cross-hatched rectilinear textures. This paper proposes new surface textures, generatedby an innovative honing prototype machine, with original patterns (circles and ellipses) at different size and aspect ratio. Then, the friction performances of each generated surface are evaluated using a reciprocating ring–liner tribometer and compared with industrial helical slide honed (HSH) texture. The results show that ellipse patterns oriented at ring sliding direction contribute the most to reduce the friction coefficient.

  • Influence de l'échelle de rugosité sur le frottement dans les contacts lubrifiés.
    2013
    Co-Authors: Ibrahim Demirci, Sabeur Mezghani, Hassan Zahouani, Mohamed Yousfi, Mohamed El Mansori
    Abstract:

    The reduction of friction and the limitation of emissions of greenhouse gases are the main objectives of the automotive industry. This energy e ciency is related to functionalization of the surface of ringPack tribo-System. Multi-stage abrasive nishing process are commonly used to produce the geometrical properties of a surface. This confers technical some functionalities in the operating characteristics relating to their durability and reliability. The texture generated signi cantly a ects the performance of the ring-Pack System. In this paper, a numerical model of elasto-hydrodynamic (EHD) contact coupled to a multiscale surface texture modeling was developed. This permtis to to study the scale e ect of surface features and theirs interactions on friction performance and lubricant ow under hydrodynamic lubrication condition. Surface topography can be decomposed in two principal components : super cial roughness modeled using fractal model and valleys modeled by scaling factor. Results show Relationship between friction and surface scales.

  • Mutual influence of cross hatch angle and superficial roughness of honed surfaces on friction in ring-Pack tribo-System
    Tribology International, 2013
    Co-Authors: Sabeur Mezghani, Ibrahim Demirci, Mohamed El Mansori, Mohammed Yousfi
    Abstract:

    The cylinder bore surface texture, widely produced by the honing technique, is an essential factor for a good engine performance (friction, oil consumption, running-in, wear etc.). This explains the improvement and development of various new honing techniques. These different honing processes generate surfaces with various texture features characteristics (roughness, valleys depth, cross hatch angle, etc.). This paper addresses a comparison of ring-Pack friction for cylinder surfaces produced by plateau honing and helical slide honing. It takes in consideration the mutual effect of superficial plateau roughness amplitude and honing angle. A numerical model is developed to predict friction within the cylinder ring-Pack System in mixed lubrication regime. The results show the effectiveness of helical slide honed surface texture in comparison to plateau honed bore surfaces

  • Energy efficiency optimization of engine by frictional reduction of functional surfaces of cylinder ring-Pack System
    TRIBOLOGY INTERNATIONAL, 2013
    Co-Authors: Sabeur Mezghani, Ibrahim Demirci, Mohamed El Mansori, Hassan Zahouani
    Abstract:

    Friction reduction, lower oil consumption, and limitation of greenhouse gases emissions are the chief objectives of the automotive industry in order to improve the environmental efficiency of vehicle engines. In this paper, a strategy for ring-Pack friction reduction through cylinder liner finish optimization based on coupling instrumented honing experiments and numerical prediction of elastohydrodynamic friction is proposed. The results show that honed surfaces produced by fine abrasion by honing stones yield the optimal elastohydrodynamic friction. They also demonstrate the limitations of ISO 13565 standard roughness parameters in giving a complete description of the functional performances of cylinder surface finishes.

Ibrahim Demirci - One of the best experts on this subject based on the ideXlab platform.

  • Tribological performances of elliptic and circular texture patterns produced by innovative honing process
    Tribology International, 2016
    Co-Authors: Mohamed Yousfi, Sabeur Mezghani, Ibrahim Demirci, Mohamed El Mansori
    Abstract:

    Honing is a manufacturing process which uses friction and abrasion mechanisms at a reduced velocity to print a multiscale and anisotropic texture on the liner surface of automotive engines. It enables to enhance the functional performances of a ring-Pack System. However, industrial honing basically generates cross-hatched rectilinear textures. This paper proposes new surface textures, generatedby an innovative honing prototype machine, with original patterns (circles and ellipses) at different size and aspect ratio. Then, the friction performances of each generated surface are evaluated using a reciprocating ring–liner tribometer and compared with industrial helical slide honed (HSH) texture. The results show that ellipse patterns oriented at ring sliding direction contribute the most to reduce the friction coefficient.

  • Influence de l'échelle de rugosité sur le frottement dans les contacts lubrifiés.
    2013
    Co-Authors: Ibrahim Demirci, Sabeur Mezghani, Hassan Zahouani, Mohamed Yousfi, Mohamed El Mansori
    Abstract:

    The reduction of friction and the limitation of emissions of greenhouse gases are the main objectives of the automotive industry. This energy e ciency is related to functionalization of the surface of ringPack tribo-System. Multi-stage abrasive nishing process are commonly used to produce the geometrical properties of a surface. This confers technical some functionalities in the operating characteristics relating to their durability and reliability. The texture generated signi cantly a ects the performance of the ring-Pack System. In this paper, a numerical model of elasto-hydrodynamic (EHD) contact coupled to a multiscale surface texture modeling was developed. This permtis to to study the scale e ect of surface features and theirs interactions on friction performance and lubricant ow under hydrodynamic lubrication condition. Surface topography can be decomposed in two principal components : super cial roughness modeled using fractal model and valleys modeled by scaling factor. Results show Relationship between friction and surface scales.

  • Mutual influence of cross hatch angle and superficial roughness of honed surfaces on friction in ring-Pack tribo-System
    Tribology International, 2013
    Co-Authors: Sabeur Mezghani, Ibrahim Demirci, Mohamed El Mansori, Mohammed Yousfi
    Abstract:

    The cylinder bore surface texture, widely produced by the honing technique, is an essential factor for a good engine performance (friction, oil consumption, running-in, wear etc.). This explains the improvement and development of various new honing techniques. These different honing processes generate surfaces with various texture features characteristics (roughness, valleys depth, cross hatch angle, etc.). This paper addresses a comparison of ring-Pack friction for cylinder surfaces produced by plateau honing and helical slide honing. It takes in consideration the mutual effect of superficial plateau roughness amplitude and honing angle. A numerical model is developed to predict friction within the cylinder ring-Pack System in mixed lubrication regime. The results show the effectiveness of helical slide honed surface texture in comparison to plateau honed bore surfaces

  • Energy efficiency optimization of engine by frictional reduction of functional surfaces of cylinder ring-Pack System
    TRIBOLOGY INTERNATIONAL, 2013
    Co-Authors: Sabeur Mezghani, Ibrahim Demirci, Mohamed El Mansori, Hassan Zahouani
    Abstract:

    Friction reduction, lower oil consumption, and limitation of greenhouse gases emissions are the chief objectives of the automotive industry in order to improve the environmental efficiency of vehicle engines. In this paper, a strategy for ring-Pack friction reduction through cylinder liner finish optimization based on coupling instrumented honing experiments and numerical prediction of elastohydrodynamic friction is proposed. The results show that honed surfaces produced by fine abrasion by honing stones yield the optimal elastohydrodynamic friction. They also demonstrate the limitations of ISO 13565 standard roughness parameters in giving a complete description of the functional performances of cylinder surface finishes.

Qingsong Wang - One of the best experts on this subject based on the ideXlab platform.

  • water cooling based strategy for lithium ion battery Pack dynamic cycling for thermal management System
    Applied Thermal Engineering, 2018
    Co-Authors: Ke Li, Jiajia Yan, Haodong Chen, Qingsong Wang
    Abstract:

    Abstract To investigate the thermal performance of water cooling based battery thermal management System in lithium ion batteries dynamic cycling, the experimental and numerical studies are carried out in this work. In numerical simulation, an electrochemical-thermal model is adopted to predict the thermal behavior and validates with experimental measurement. For both experimental and simulated results, the voltage, current, and the temperature distribution in the single battery and battery Pack are exhibited. In addition, the active water cooling System is the better method to improve the battery Pack thermal performance at low cycling rate. Moreover, dealing with the situation of using battery Pack in wide range at different rate, a compound System need to be design in the real battery Pack System.

  • Experimental study on the application of phase change material in the dynamic cycling of battery Pack System
    Energy Conversion and Management, 2016
    Co-Authors: Jiajia Yan, Haodong Chen, Qingsong Wang, Jinhua Sun
    Abstract:

    Abstract The thermal performance of phase change material (PCM) based battery thermal management System in dynamic cycling is investigated, and several factors influencing the PCM System are discussed in detail. It is established that the surface temperature of a single battery has two temperature peaks during one charge/discharge cycle, while it disappears in the PCM System for the temperature buffering of PCM. In addition, the cooling performance of the PCM System is superior to that of natural convection System especially at a high current rate. Moreover, increasing the laying-aside time properly between each cycling step is beneficial to the cooling performance of the PCM System. Additionally, PCM with a phase change temperature of 45 °C is recommended to be used in the real battery Pack System.