The Experts below are selected from a list of 33 Experts worldwide ranked by ideXlab platform
F. Sassani - One of the best experts on this subject based on the ideXlab platform.
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Stick-slip vibration between two large concentric circular discs in rotational contact with multiple point loads
Journal of Mechanical Design, 2003Co-Authors: M. Baleri, F. SassaniAbstract:This paper presents a study of the stick-slip Frictional Phenomenon when large contact areas subjected to uneven contact loads, such as the rotating platform of excavators and large robotic manipulators, are involved. The objective of the investigation is to a gain better understanding of the Phenomenon from experimental observations and to develop a mathematical representation that can be used for modeling, simulation and design purposes. A dynamic integral-model has been proposed and simulations have been carried out. The effects of various system parameters on the behavior of the system have been studied experimentally and analytically. The simulation results using the proposed integral-model are in good agreement with the experimental results. The latter also show that stick-slip vibrations can be influenced by the loading conditions.
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Stick-Slip Vibration Between Two Large Concentric Circular Discs in Rotational Contact With Multiple Point Loads
Contact Mechanics, 2003Co-Authors: M. Baleri, F. SassaniAbstract:This paper presents a study of the stick-slip Frictional Phenomenon when large contact areas subjected to uneven contact loads are involved. The objective of the investigation is to gain better understanding of the Phenomenon from experimental observations and to develop a mathematical representation that can be used for modeling, simulation and design purposes. A dynamic integral-model has been proposed and simulations have been carried out. The effects of various system parameters on the behavior of the system have been studied experimentally and analytically. The simulation results using the proposed integral-model are in good agreement with the experimental results. The latter also show that stick-slip vibrations can be influenced by the loading conditions.
M. Baleri - One of the best experts on this subject based on the ideXlab platform.
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Stick-slip vibration between two large concentric circular discs in rotational contact with multiple point loads
Journal of Mechanical Design, 2003Co-Authors: M. Baleri, F. SassaniAbstract:This paper presents a study of the stick-slip Frictional Phenomenon when large contact areas subjected to uneven contact loads, such as the rotating platform of excavators and large robotic manipulators, are involved. The objective of the investigation is to a gain better understanding of the Phenomenon from experimental observations and to develop a mathematical representation that can be used for modeling, simulation and design purposes. A dynamic integral-model has been proposed and simulations have been carried out. The effects of various system parameters on the behavior of the system have been studied experimentally and analytically. The simulation results using the proposed integral-model are in good agreement with the experimental results. The latter also show that stick-slip vibrations can be influenced by the loading conditions.
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Stick-Slip Vibration Between Two Large Concentric Circular Discs in Rotational Contact With Multiple Point Loads
Contact Mechanics, 2003Co-Authors: M. Baleri, F. SassaniAbstract:This paper presents a study of the stick-slip Frictional Phenomenon when large contact areas subjected to uneven contact loads are involved. The objective of the investigation is to gain better understanding of the Phenomenon from experimental observations and to develop a mathematical representation that can be used for modeling, simulation and design purposes. A dynamic integral-model has been proposed and simulations have been carried out. The effects of various system parameters on the behavior of the system have been studied experimentally and analytically. The simulation results using the proposed integral-model are in good agreement with the experimental results. The latter also show that stick-slip vibrations can be influenced by the loading conditions.
Bangkang Wang - One of the best experts on this subject based on the ideXlab platform.
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morphological observation and Frictional Phenomenon of ceramic brackets
Chinese Journal of Orthodontics, 2012Co-Authors: Lingling Qiu, Li Yang, Yuxing Bai, L I Song, Bangkang WangAbstract:Objective To study the structure factors influencing the Frictional characteristics of the brackets and archwire.Methods Observation of the morphology of bracket and microstructure of the brackets' slots were conducted with stereo microscope and scanning electron microscope (SEM) before and after sliding along the archwires.Hardness measurement of four brackets were done with microhardness tester.The results were statistically analyzed with one-way analysis of variance and Student-Newman-Keuls multiple comparison test at the 0.05 level of significance.Results Morphological observations showed a great variability in the bracket and bracket slot microstructure among the brackets tested,as well as before and after sliding.Vickers hardness of the brackets were as follows,metal slot of A(F) 213.72±57.33,D 305.76±46.65,B 1087.12±139.86,A 1111.26±182.52,C 1309.81±225.56,which showed great variations among the brackets.Conclusions There were significant differences in the morphology,microstructure,and microhardness among the brackets tested,which might anticipate that hardness and roughness were two influencing factor for the friction between bracket and archwire.The rougher surface and higher hardness of the ceramic bracket caused the higher friction force. Key words: Ceramic bracket; Friction; Roughness; Hardness
Uday K. Vaidya - One of the best experts on this subject based on the ideXlab platform.
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Spatial Impact of a Slender Beam
Journal of Engineering Materials and Technology, 2003Co-Authors: Horatiu Barbulescu, Dan B. Marghitu, Uday K. VaidyaAbstract:In this paper, the dynamics of the spatial impact of a slender beam is analyzed. The equations of motion are calculated using Kane’s impact method. The generalized momentum and generalized impulse of the beam are considered to find the equations of motion of the beam. The Frictional Phenomenon at the contact point is analyzed. For the case of impact without slipping, it is used the assumption that the tangential component of the velocity of separation is null. In the case with slipping, the tangential impulse (at the plane of impact) is computed. The sliding direction after impact is calculated. A simulation of the impact of beam with a surface is developed and the velocity of separation, force of impact and kinetic energy of the beam after impact are studied for different incident angles of the beam. The incident angle is varied from 0 deg to 57 deg. The results are function of the incident angle of impact.
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Spatial Impact of a Slender Beam
Transportation: Making Tracks for Tomorrow’s Transportation, 2002Co-Authors: Horatiu Barbulescu, Dan B. Marghitu, Uday K. VaidyaAbstract:In this paper, the dynamics of the spatial impact of a slender beam is analyzed. The equations of motion are calculated using Kane’s impact method. The generalized momentum and generalized impulse of the beam are considered to find the equations of motion of the beam. The Frictional Phenomenon at the contact point is analyzed. For the case of impact without slipping, it is used the assumption that the tangential component of the velocity of separation is null. In the case with slipping, the tangential impulse (at the plane of impact) is computed. The sliding direction after impact is calculated. A simulation of the impact of beam with a surface is developed and the velocity of separation, force of impact and kinetic energy of the beam after impact are studied for different incident angles of the beam. The incident angle is varied from 0° to 57°. The results are function of the incident angle of impact. The results can be used to calculate the coefficient of restitution and friction for composite materials.
Lingling Qiu - One of the best experts on this subject based on the ideXlab platform.
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morphological observation and Frictional Phenomenon of ceramic brackets
Chinese Journal of Orthodontics, 2012Co-Authors: Lingling Qiu, Li Yang, Yuxing Bai, L I Song, Bangkang WangAbstract:Objective To study the structure factors influencing the Frictional characteristics of the brackets and archwire.Methods Observation of the morphology of bracket and microstructure of the brackets' slots were conducted with stereo microscope and scanning electron microscope (SEM) before and after sliding along the archwires.Hardness measurement of four brackets were done with microhardness tester.The results were statistically analyzed with one-way analysis of variance and Student-Newman-Keuls multiple comparison test at the 0.05 level of significance.Results Morphological observations showed a great variability in the bracket and bracket slot microstructure among the brackets tested,as well as before and after sliding.Vickers hardness of the brackets were as follows,metal slot of A(F) 213.72±57.33,D 305.76±46.65,B 1087.12±139.86,A 1111.26±182.52,C 1309.81±225.56,which showed great variations among the brackets.Conclusions There were significant differences in the morphology,microstructure,and microhardness among the brackets tested,which might anticipate that hardness and roughness were two influencing factor for the friction between bracket and archwire.The rougher surface and higher hardness of the ceramic bracket caused the higher friction force. Key words: Ceramic bracket; Friction; Roughness; Hardness
