The Experts below are selected from a list of 2067 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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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...
Takahisa Kawaguchi - One of the best experts on this subject based on the ideXlab platform.
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frictional torque of needle Roller thrust bearings
Tribology Transactions, 2008Co-Authors: Tetsuzo Hatazawa, Takahisa KawaguchiAbstract:In this study, the frictional torque of a needle Roller thrust bearing was investigated theoretically and experimentally. In order to evaluate the torque, the Roller motion of the bearing was explained regarding the condition that the energy loss generated at the portion where the Roller comes in contact with the raceway becomes minimum. Second, by using the results obtained above, the frictional torque of three types of needle Roller thrust bearing, single-, double-, and triple-row, were analyzed. Following the theoretical studies, using various types of bearings obtained by changing the number of Rollers, the bearing pitch Diameters, the Roller length, the Roller Diameter, and the number of rows, experimental investigations were carried out.
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frictional characteristics of needle Roller thrust bearings part 1 in the case of single row type bearing
Japanese journal of tribology, 2003Co-Authors: Tetsuzo Hatazawa, Takahisa Kawaguchi, Jujiro KagamiAbstract:In this paper, we discuss with theoretical and experimental investigation concerning frictional torque of needle Roller thrust bearings. With a view to examining, frictional torque from a theoretical point of view, Roller motion of one of the bearings is explained regarding the condition that energy loss generated at the portion where the Roller comes in contact with the raceways becomes the minimum. Second, by using the results obtained above, we assessed the frictional torque of the thrust bearing of the single-row type. Meanwhile, using various types of bearings obtained by changing Roller Diameter, Roller effective length, number of Rollers, and pitch circle Diameter, we conducted experimental investigations under a wide range of the thrust loads at several rotational speeds. Results are summarized as follows. (1) The frictional torque of the needle Roller thrust bearing of the single-row type obtained from the analysis is proportional to the thrust load, coefficient of sliding friction, and effective Roller length. (2) The torque of the bearing is not dependent on the rotational speed, the number of the Rollers, bearing pitch Diameter, or Roller Diameter. (3) Results obtained from the experiment conducted on the single-row type qualitatively agree with the ones brought about from theoretical analysis.
Johan Arvidsson - One of the best experts on this subject based on the ideXlab platform.
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a model for prediction of vertical stress distribution near the soil surface below rubber tracked undercarriage systems fitted on agricultural vehicles
Soil & Tillage Research, 2016Co-Authors: Thomas Keller, Johan ArvidssonAbstract:Abstract Rubber-tracked vehicles are becoming increasingly popular in agriculture. Rubber-tracked undercarriage systems are typically fitted instead of tyres on heavy agricultural vehicles, with the aim of e.g. decreasing soil stress and soil compaction risks. Therefore, accurate prediction of soil stresses below rubber-tracked systems is important. Here, we present a model for prediction of vertical stress distribution at the rubber track–soil interface. In the model, the rubber-tracked undercarriage system consists of a front and rear wheel (idler and drive wheel) and a number of support Rollers. The stress distribution in the longitudinal direction under a wheel or Roller is described by harmonic oscillation, with the dynamic contact length being a function of wheel or Roller Diameter. In the lateral direction, the stress distribution is modelled by a linear function, with the maximum stress under the centre line of the track. Model input parameters include the load on the track, track width, track length (distance between front and rear axles), number of support Rollers and wheel and Roller Diameter. The model, which is written in Visual Basic and implemented as a macro in an Excel spreadsheet, then computes the vertical stress at the rubber track–soil interface based on these inputs and the stress distribution generated in the contact area can be used to simulate soil stresses. The model provides realistic estimates of the vertical stress at the contact between rubber track and soil, thereby improving predictions of soil stress and the compaction risks of rubber-tracked agricultural vehicles.
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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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...
Tetsuzo Hatazawa - One of the best experts on this subject based on the ideXlab platform.
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frictional torque of needle Roller thrust bearings
Tribology Transactions, 2008Co-Authors: Tetsuzo Hatazawa, Takahisa KawaguchiAbstract:In this study, the frictional torque of a needle Roller thrust bearing was investigated theoretically and experimentally. In order to evaluate the torque, the Roller motion of the bearing was explained regarding the condition that the energy loss generated at the portion where the Roller comes in contact with the raceway becomes minimum. Second, by using the results obtained above, the frictional torque of three types of needle Roller thrust bearing, single-, double-, and triple-row, were analyzed. Following the theoretical studies, using various types of bearings obtained by changing the number of Rollers, the bearing pitch Diameters, the Roller length, the Roller Diameter, and the number of rows, experimental investigations were carried out.
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frictional characteristics of needle Roller thrust bearings part 1 in the case of single row type bearing
Japanese journal of tribology, 2003Co-Authors: Tetsuzo Hatazawa, Takahisa Kawaguchi, Jujiro KagamiAbstract:In this paper, we discuss with theoretical and experimental investigation concerning frictional torque of needle Roller thrust bearings. With a view to examining, frictional torque from a theoretical point of view, Roller motion of one of the bearings is explained regarding the condition that energy loss generated at the portion where the Roller comes in contact with the raceways becomes the minimum. Second, by using the results obtained above, we assessed the frictional torque of the thrust bearing of the single-row type. Meanwhile, using various types of bearings obtained by changing Roller Diameter, Roller effective length, number of Rollers, and pitch circle Diameter, we conducted experimental investigations under a wide range of the thrust loads at several rotational speeds. Results are summarized as follows. (1) The frictional torque of the needle Roller thrust bearing of the single-row type obtained from the analysis is proportional to the thrust load, coefficient of sliding friction, and effective Roller length. (2) The torque of the bearing is not dependent on the rotational speed, the number of the Rollers, bearing pitch Diameter, or Roller Diameter. (3) Results obtained from the experiment conducted on the single-row type qualitatively agree with the ones brought about from theoretical analysis.
