The Experts below are selected from a list of 363 Experts worldwide ranked by ideXlab platform
Seongwook Hong - One of the best experts on this subject based on the ideXlab platform.
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statistical investigation into the effects of distributed Roller diameter error on the fatigue life of Tapered Roller Bearings
Journal of Mechanical Science and Technology, 2017Co-Authors: Vancanh Tong, Seongwook HongAbstract:This study examined the effect of distributed Roller diameter error on the fatigue life of a Tapered Roller bearing (TRB). To this end, a comprehensive analysis procedure to perform a statistical analysis of the fatigue life with respect to dimensional error was presented. The Roller diameter error was assumed as normally distributed, with a designated mean value and a varying standard deviation. Simulations were conducted to investigate the effects of Roller diameter deviation on the fatigue life of the TRB. The numerical results showed that the normally distributed Roller diameter error did not necessarily result in a normally distributed bearing fatigue life. The adequate distribution function for the bearing fatigue life with respect to the Roller diameter error was explored and found to be dependent on the amount of standard deviation of Roller diameter error. The Weibull distribution is appropriate for a small standard deviation, while the gamma distribution and normal distributions are appropriate for large and in-between standard deviations, respectively.
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the effect of angular misalignment on the stiffness characteristics of Tapered Roller Bearings
Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2017Co-Authors: Vancanh Tong, Seongwook HongAbstract:The effect of angular misalignment between inner and outer raceways on the stiffness characteristics of Tapered Roller Bearings (TRBs) is investigated. A computational procedure is introduced to so...
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study on the stiffness and fatigue life of Tapered Roller Bearings with Roller diameter error
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2017Co-Authors: Vancanh Tong, Seongwook HongAbstract:Geometric imperfection is a common problem in manufacturing of rolling element Bearings. In particular, Roller geometric errors frequently occur because a large number of Rollers with relatively sm...
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the effect of angular misalignment on the running torques of Tapered Roller Bearings
Tribology International, 2016Co-Authors: Vancanh Tong, Seongwook HongAbstract:Abstract The occurrence of angular misalignment can considerably change bearing characteristics. However, the angular misalignment effect on the running torques for Tapered Roller Bearings (TRBs) has not been thoroughly investigated. This paper presents a comprehensive formula to provide the running torques for TRBs with angular misalignment between inner and outer races. Simulations were performed to investigate the effects of angular misalignment on TRB torques for two representative preloading methods, constant force preload and constant displacement preload. Angular misalignment under the constant displacement preload was found to increase the running torques under mild preload and to slightly decrease the running torques under heavy preload. Under the constant force preload, the running toques consistently decrease with an increase in angular misalignment.
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fatigue life of Tapered Roller bearing subject to angular misalignment
Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2016Co-Authors: Vancanh Tong, Seongwook HongAbstract:Angular misalignment, defined as the tilted angle between the outer ring and inner ring, is unavoidable in most applications of Tapered Roller Bearings (TBRs) due to many potential causes such as s...
Vancanh Tong - One of the best experts on this subject based on the ideXlab platform.
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statistical investigation into the effects of distributed Roller diameter error on the fatigue life of Tapered Roller Bearings
Journal of Mechanical Science and Technology, 2017Co-Authors: Vancanh Tong, Seongwook HongAbstract:This study examined the effect of distributed Roller diameter error on the fatigue life of a Tapered Roller bearing (TRB). To this end, a comprehensive analysis procedure to perform a statistical analysis of the fatigue life with respect to dimensional error was presented. The Roller diameter error was assumed as normally distributed, with a designated mean value and a varying standard deviation. Simulations were conducted to investigate the effects of Roller diameter deviation on the fatigue life of the TRB. The numerical results showed that the normally distributed Roller diameter error did not necessarily result in a normally distributed bearing fatigue life. The adequate distribution function for the bearing fatigue life with respect to the Roller diameter error was explored and found to be dependent on the amount of standard deviation of Roller diameter error. The Weibull distribution is appropriate for a small standard deviation, while the gamma distribution and normal distributions are appropriate for large and in-between standard deviations, respectively.
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the effect of angular misalignment on the stiffness characteristics of Tapered Roller Bearings
Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2017Co-Authors: Vancanh Tong, Seongwook HongAbstract:The effect of angular misalignment between inner and outer raceways on the stiffness characteristics of Tapered Roller Bearings (TRBs) is investigated. A computational procedure is introduced to so...
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study on the stiffness and fatigue life of Tapered Roller Bearings with Roller diameter error
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2017Co-Authors: Vancanh Tong, Seongwook HongAbstract:Geometric imperfection is a common problem in manufacturing of rolling element Bearings. In particular, Roller geometric errors frequently occur because a large number of Rollers with relatively sm...
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the effect of angular misalignment on the running torques of Tapered Roller Bearings
Tribology International, 2016Co-Authors: Vancanh Tong, Seongwook HongAbstract:Abstract The occurrence of angular misalignment can considerably change bearing characteristics. However, the angular misalignment effect on the running torques for Tapered Roller Bearings (TRBs) has not been thoroughly investigated. This paper presents a comprehensive formula to provide the running torques for TRBs with angular misalignment between inner and outer races. Simulations were performed to investigate the effects of angular misalignment on TRB torques for two representative preloading methods, constant force preload and constant displacement preload. Angular misalignment under the constant displacement preload was found to increase the running torques under mild preload and to slightly decrease the running torques under heavy preload. Under the constant force preload, the running toques consistently decrease with an increase in angular misalignment.
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fatigue life of Tapered Roller bearing subject to angular misalignment
Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2016Co-Authors: Vancanh Tong, Seongwook HongAbstract:Angular misalignment, defined as the tilted angle between the outer ring and inner ring, is unavoidable in most applications of Tapered Roller Bearings (TBRs) due to many potential causes such as s...
Constantine Tarawneh - One of the best experts on this subject based on the ideXlab platform.
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Defect detection in freight railcar Tapered-Roller Bearings using vibration techniques
Railway Engineering Science, 2021Co-Authors: Constantine Tarawneh, Joseph Montalvo, Brent WilsonAbstract:Currently, there are two types of defect detection systems used to monitor the health of freight railcar Bearings in service: wayside hot-box detection systems and trackside acoustic detection systems. These systems have proven to be inefficient in accurately determining bearing health, especially in the early stages of defect development. To that end, a prototype onboard bearing condition monitoring system has been developed and validated through extensive laboratory testing and a designated field test in 2015 at the Transportation Technology Center, Inc. in Pueblo, CO. The devised system can accurately and reliably characterize the health of Bearings based on developed vibration thresholds and can identify defective Tapered-Roller bearing components with defect areas smaller than 12.9 cm^2 while in service.
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experiments and models for the thermal response of railroad Tapered Roller Bearings
International Journal of Heat and Mass Transfer, 2008Co-Authors: Constantine Tarawneh, Kevi D Cole, E M Wilso, Fadi AlnaimaAbstract:Based on this initial work, several laboratory experiments were conducted using heaters embedded in two Rollers to study the dynamics of heating in railroad Tapered-Roller Bearings. This paper describes the results of these heat transfer experiments. The paper begins with a review of current detection methods and previous studies that investigated bearing heating due to the presence of defects. Next, the experimental setup and procedures are explained in detail, which is then followed by the development of zero- and first-order models that were used to fit the experimental data in order to estimate overall heat transfer coefficients for the bearing. The paper wraps up with a discussion of the results and a summary.
Brent Wilson - One of the best experts on this subject based on the ideXlab platform.
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Defect detection in freight railcar Tapered-Roller Bearings using vibration techniques
Railway Engineering Science, 2021Co-Authors: Constantine Tarawneh, Joseph Montalvo, Brent WilsonAbstract:Currently, there are two types of defect detection systems used to monitor the health of freight railcar Bearings in service: wayside hot-box detection systems and trackside acoustic detection systems. These systems have proven to be inefficient in accurately determining bearing health, especially in the early stages of defect development. To that end, a prototype onboard bearing condition monitoring system has been developed and validated through extensive laboratory testing and a designated field test in 2015 at the Transportation Technology Center, Inc. in Pueblo, CO. The devised system can accurately and reliably characterize the health of Bearings based on developed vibration thresholds and can identify defective Tapered-Roller bearing components with defect areas smaller than 12.9 cm^2 while in service.
Ziqiang Zhao - One of the best experts on this subject based on the ideXlab platform.
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temperature rise of double row Tapered Roller Bearings analyzed with the thermal network method
Tribology International, 2015Co-Authors: Wenzhong Wang, Yunlong Wang, Ziqiang ZhaoAbstract:Abstract Based on generalized Ohm׳s law, the thermal network model (TNM) is developed for double-row Tapered Roller bearing lubricated with grease, which is commonly used in high-speed railway. The load distribution and kinematic parameters in bearing are obtained by developing a quasi-static model. The temperature of bearing at different speeds, filling grease ratios and Roller large end radius are investigated. The results show that large rotating speed and filling grease ratio result in high temperature rise, especially at Roller large end/flange contacts. Besides, an optimal Roller large end radius is presented and its mechanism has been explored.
