The Experts below are selected from a list of 54 Experts worldwide ranked by ideXlab platform
Philippe Dufrenoy - One of the best experts on this subject based on the ideXlab platform.
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Methodology of porosity modeling for Friction Pad: Consequence on squeal
Tribology International, 2017Co-Authors: Vincent Magnier, Emmanuel Roubin, Jean-baptiste Colliat, Philippe DufrenoyAbstract:Mechanical property is an important parameter of Friction material as it influences contact distribution (tribological and thermo-mechanical behavior), dynamic behavior (and then squeal propensity). Due to the process, the percentage of porosity in the volume is near 10%. So, a Friction Pad has been characterized by a topographical study using X-ray. This step permits to obtain some information concerning the porosity. In a second step, a simplified pin-on-disc is modeled using finite element method considering initially homogenized Friction material and secondly heterogeneous Friction material including the pores. The pore distributions are generated using a representative random fields technique. The introduction of pores shows clearly some differences on dynamical behavior between homogenized and heterogeneous materials consideration.
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Influence of geometry imperfections on squeal noise linked to mode lock-in
International Journal of Solids and Structures, 2015Co-Authors: Kevin Bonnay, Vincent Magnier, Philippe Dufrenoy, Jean-françois Brunel, Géry De SaxcéAbstract:Numerical studies of squeal in brake systems are carried out with unreal perfect surfaces. In this paper, a methodology to introduce geometric imperfections in the multi-scale contact problem is proposed. Two kinds of geometric imperfections are taken into account separately: the first is “disc thickness variation” as function of the disc while the second is the “plateau” as function of the Friction Pad. A complete resolution strategy is proposed with a combination of finite element analysis and a lumped-mass model for a simplified pin-on-disc system. A complex modal analysis is performed for different static configurations in which only the contact pressure evolves. Parametric studies for both cases are performed to study the influence of these geometric imperfections on mode lock-in. It is shown that the introduction of both kinds of geometrical imperfections have an influence on dynamic behavior and mode lock-in (through modification of the eigenfrequencies of the system). The Pad mode is mostly influenced by bumping which modifies the contact localization. Considering plateaus on the Pad surface highlights the importance of the theoretical contact length parameter.
Vincent Magnier - One of the best experts on this subject based on the ideXlab platform.
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Methodology of porosity modeling for Friction Pad: Consequence on squeal
Tribology International, 2017Co-Authors: Vincent Magnier, Emmanuel Roubin, Jean-baptiste Colliat, Philippe DufrenoyAbstract:Mechanical property is an important parameter of Friction material as it influences contact distribution (tribological and thermo-mechanical behavior), dynamic behavior (and then squeal propensity). Due to the process, the percentage of porosity in the volume is near 10%. So, a Friction Pad has been characterized by a topographical study using X-ray. This step permits to obtain some information concerning the porosity. In a second step, a simplified pin-on-disc is modeled using finite element method considering initially homogenized Friction material and secondly heterogeneous Friction material including the pores. The pore distributions are generated using a representative random fields technique. The introduction of pores shows clearly some differences on dynamical behavior between homogenized and heterogeneous materials consideration.
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Influence of geometry imperfections on squeal noise linked to mode lock-in
International Journal of Solids and Structures, 2015Co-Authors: Kevin Bonnay, Vincent Magnier, Philippe Dufrenoy, Jean-françois Brunel, Géry De SaxcéAbstract:Numerical studies of squeal in brake systems are carried out with unreal perfect surfaces. In this paper, a methodology to introduce geometric imperfections in the multi-scale contact problem is proposed. Two kinds of geometric imperfections are taken into account separately: the first is “disc thickness variation” as function of the disc while the second is the “plateau” as function of the Friction Pad. A complete resolution strategy is proposed with a combination of finite element analysis and a lumped-mass model for a simplified pin-on-disc system. A complex modal analysis is performed for different static configurations in which only the contact pressure evolves. Parametric studies for both cases are performed to study the influence of these geometric imperfections on mode lock-in. It is shown that the introduction of both kinds of geometrical imperfections have an influence on dynamic behavior and mode lock-in (through modification of the eigenfrequencies of the system). The Pad mode is mostly influenced by bumping which modifies the contact localization. Considering plateaus on the Pad surface highlights the importance of the theoretical contact length parameter.
Géry De Saxcé - One of the best experts on this subject based on the ideXlab platform.
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Influence of geometry imperfections on squeal noise linked to mode lock-in
International Journal of Solids and Structures, 2015Co-Authors: Kevin Bonnay, Vincent Magnier, Philippe Dufrenoy, Jean-françois Brunel, Géry De SaxcéAbstract:Numerical studies of squeal in brake systems are carried out with unreal perfect surfaces. In this paper, a methodology to introduce geometric imperfections in the multi-scale contact problem is proposed. Two kinds of geometric imperfections are taken into account separately: the first is “disc thickness variation” as function of the disc while the second is the “plateau” as function of the Friction Pad. A complete resolution strategy is proposed with a combination of finite element analysis and a lumped-mass model for a simplified pin-on-disc system. A complex modal analysis is performed for different static configurations in which only the contact pressure evolves. Parametric studies for both cases are performed to study the influence of these geometric imperfections on mode lock-in. It is shown that the introduction of both kinds of geometrical imperfections have an influence on dynamic behavior and mode lock-in (through modification of the eigenfrequencies of the system). The Pad mode is mostly influenced by bumping which modifies the contact localization. Considering plateaus on the Pad surface highlights the importance of the theoretical contact length parameter.
Jean-baptiste Colliat - One of the best experts on this subject based on the ideXlab platform.
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Methodology of porosity modeling for Friction Pad: Consequence on squeal
Tribology International, 2017Co-Authors: Vincent Magnier, Emmanuel Roubin, Jean-baptiste Colliat, Philippe DufrenoyAbstract:Mechanical property is an important parameter of Friction material as it influences contact distribution (tribological and thermo-mechanical behavior), dynamic behavior (and then squeal propensity). Due to the process, the percentage of porosity in the volume is near 10%. So, a Friction Pad has been characterized by a topographical study using X-ray. This step permits to obtain some information concerning the porosity. In a second step, a simplified pin-on-disc is modeled using finite element method considering initially homogenized Friction material and secondly heterogeneous Friction material including the pores. The pore distributions are generated using a representative random fields technique. The introduction of pores shows clearly some differences on dynamical behavior between homogenized and heterogeneous materials consideration.
Emmanuel Roubin - One of the best experts on this subject based on the ideXlab platform.
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Methodology of porosity modeling for Friction Pad: Consequence on squeal
Tribology International, 2017Co-Authors: Vincent Magnier, Emmanuel Roubin, Jean-baptiste Colliat, Philippe DufrenoyAbstract:Mechanical property is an important parameter of Friction material as it influences contact distribution (tribological and thermo-mechanical behavior), dynamic behavior (and then squeal propensity). Due to the process, the percentage of porosity in the volume is near 10%. So, a Friction Pad has been characterized by a topographical study using X-ray. This step permits to obtain some information concerning the porosity. In a second step, a simplified pin-on-disc is modeled using finite element method considering initially homogenized Friction material and secondly heterogeneous Friction material including the pores. The pore distributions are generated using a representative random fields technique. The introduction of pores shows clearly some differences on dynamical behavior between homogenized and heterogeneous materials consideration.
