The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Dominic Dibrito - One of the best experts on this subject based on the ideXlab platform.
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Effects of wheel-rail contact geometry on wheel set steering forces
Wear, 1996Co-Authors: Stephen Mace, Reuben Pena, Nicholas Wilson, Dominic DibritoAbstract:Adverse wheel-rail contact geometry and flange lubrication have been implicated in a number of recent gage widening and rail rollover derailments. The underlying derailment mechanism is shown to be a loss of wheel set steering due to a reduction in wheel set Rolling Radius difference, leading to shear deformation of the truck and the generation of large lateral gage spreading forces. A series of theoretical analyses and field experiments have been conducted that demonstrate the loss of steering caused by the following wheel-rail contact conditions: 1. strong two-point contact between flanging wheels and rails; 2. hollow worn wheel treads; 3. heavy gage corner grinding on the rail; 4. high rail gage face lubrication; 5. dry railheads. Studies conducted at several gage widening and rail rollover derailment sites have shown that these conditions are not uncommon on North American railroads.
Masayuki Okano - One of the best experts on this subject based on the ideXlab platform.
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Improvement of bogie curving performance by using friction modifier to rail/wheel interface: Verification by full-scale Rolling stand test
Wear, 2005Co-Authors: Akira Matsumoto, Masao Tomeoka, Kousuke Matsumoto, Masuhisa Tanimoto, Tomohisa Ogino, Yasuhiro Sato, Hiroyuki Ohno, Masayuki OkanoAbstract:In very sharp curved tracks where the efficient difference of Rolling Radius between inside/outside wheels is hard to obtain by the bogie, various ill-suited phenomena, such as rail corrugation, squeal noise, derailment and etc., are occurring. The purpose of this study is to avoid these phenomena. The effect of friction modifier on the improvement of bogie curving performance has been systematically tested. Stand tests of curving performance were carried out using full-scale test stand and bogie. The test results show that friction modifier can reduce the lateral force of front-outside wheel and longitudinal forces of rear wheels, which produce un-desired phenomena in sharp curves.
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Improvement of bogie curving performance by using friction modifier to rail/wheel interface Verification by full-scale Rolling stand test
Wear, 2005Co-Authors: Akira Matsumoto, Masao Tomeoka, Kousuke Matsumoto, Masuhisa Tanimoto, Yasushi Oka, Tomohisa Ogino, Yasuhiro Sato, Hiroyuki Ohno, Masayuki OkanoAbstract:In very sharp curved tracks where the efficient difference of Rolling Radius between inside/outside wheels is hard to obtain by the bogie, various ill-suited phenomena, such as rail corrugation, squeal noise, derailment and etc., are occurring. The purpose of this study is to avoid these phenomena. The effect of friction modifier on the improvement of bogie curving performance has been systematically tested. Stand tests of curving performance were carried out using full-scale test stand and bogie. The test results show that friction modifier can reduce the lateral force of front-outside wheel and longitudinal forces of rear wheels, which produce un-desired phenomena in sharp curves. © 2004 Elsevier B.V. All rights reserved.
Wang Yan-yang - One of the best experts on this subject based on the ideXlab platform.
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Tire Pressure Monitoring System Based on ABS Signal
Agricultural Equipment & Vehicle Engineering, 2020Co-Authors: Wang Yan-yangAbstract:The paper introduced four indirect tire pressure monitoring system based on wheel speed gained from ABS (anti-blocking system). It uses rim speed comparison, effective Rolling Radius, torsional stiffness and longitudinal stiffness as parameters and use different methods to monitor tire pressure. Also the developing direction in the future is proposed.
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Tire Pressure Monitoring System Based on Virtual Sensing
Auto Electric Parts, 2020Co-Authors: Wang Yan-yangAbstract:The virtual sensing technology is applied to estimate signals where direct sensors can not be placed.A tire pressure monitoring system based on the theory of virtual sensing is introduced.Signals from ABS,effective Rolling Radius,torsional stiffness and longitudinal stiffness are all used as parameters to monitor tire pressure.The developing trend is also predicted here.
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The Research about the Method of Tire Pressure Monitoring Based on a Patten Search
Mathematics in Practice and Theory, 2020Co-Authors: Wang Yan-yangAbstract:An longitudinal force model of tire with two parameters was developed in this paper for estimating the longitudinal stiffness and Rolling Radius of the tire.The method estimating the tow parameters is established by using a mixed technique of patten search and least-squre regresson.The algorithm applied to real teast vehicle data shows that measured tire pressure and estimated longitudinal stiffness are approximately inversely proportional.It also suggests that longitudinal stiffness estimate may be used to predict tire inflation pressure.
Stephen Mace - One of the best experts on this subject based on the ideXlab platform.
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Effects of wheel-rail contact geometry on wheel set steering forces
Wear, 1996Co-Authors: Stephen Mace, Reuben Pena, Nicholas Wilson, Dominic DibritoAbstract:Adverse wheel-rail contact geometry and flange lubrication have been implicated in a number of recent gage widening and rail rollover derailments. The underlying derailment mechanism is shown to be a loss of wheel set steering due to a reduction in wheel set Rolling Radius difference, leading to shear deformation of the truck and the generation of large lateral gage spreading forces. A series of theoretical analyses and field experiments have been conducted that demonstrate the loss of steering caused by the following wheel-rail contact conditions: 1. strong two-point contact between flanging wheels and rails; 2. hollow worn wheel treads; 3. heavy gage corner grinding on the rail; 4. high rail gage face lubrication; 5. dry railheads. Studies conducted at several gage widening and rail rollover derailment sites have shown that these conditions are not uncommon on North American railroads.
Pawel Dobrzanski - One of the best experts on this subject based on the ideXlab platform.
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Measurement of Wheel Radius in an Automated Guided Vehicle
Applied Sciences, 2020Co-Authors: Miroslaw Smieszek, Magdalena Dobrzanska, Pawel DobrzanskiAbstract:In the case of automated guided vehicles using odometry, a very important issue is to know the actual Rolling Radius of the wheel used to calculate the position of the vehicle. This Radius is not constant. Its changes depend on the elastic deformation of the band layer and wheel slip. The theoretical determination of the value of the Radius and the nature of the change is very difficult. For this reason, it was decided to determine the Rolling radii by the experimental method. For this purpose, an appropriate test stand was built and the proposed research method was checked. Within the tests, there was also obtained a number of interesting results characterizing the material used to build bands and the ranges of changes Rolling radii for the tested material were specified.
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the impact of load on the wheel Rolling Radius and slip in a small mobile platform
Autonomous Robots, 2019Co-Authors: Miroslaw Smieszek, M Dobrzanska, Pawel DobrzanskiAbstract:Automated guided vehicles are used in a variety of applications. Their major purpose is to replace humans in onerous, monotonous and sometimes dangerous operations. Such vehicles are controlled and navigated by application-specific software. In the case of vehicles used in multiple environments and operating conditions, such as the vehicles which are the subject of this study, a reasonable approach is required when selecting the navigation system. The vehicle may travel around an enclosed hall and around an open yard. The pavement surface may be smooth or uneven. Vehicle wheels should be flexible and facilitate the isolation and absorption of vibrations in order to reduce the effect of surface unevenness to the load. Another important factor affecting the operating conditions are changes to vehicle load resulting from the distribution of the load and the weight carried. Considering all of the factors previously mentioned, the vehicle’s navigation and control system is required to meet two opposing criteria. One of them is low price and simplicity, the other is ensuring the required accuracy when following the preset route. In the course of this study, a methodology was developed and tested which aims to obtain a satisfactory compromise between those two conflicting criteria. During the study a vehicle made in Technical University of Rzeszow was used. The results of the experimental research have been analysed. The results of the analysis provided a foundation for the development of a methodology leading to a reduction in navigation errors. Movement simulations for the proposed vehicle system demonstrated the potential for a significant reduction in the number of positioning errors.
