Curvature Estimation Method of Curve Section Using Relative Displacement Between Body and Bogie of Rolling-stock

Hur, Hyun-Moo; Park, Joon Hyuk; You, Won Hee

doi:10.3795/ksme-a.2012.36.11.1479

Cited by 6 publications

(8 citation statements)

References 1 publication

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“…The triangles OPA and Aab are congruent from the geometric relation between Eqs. (9) and (10), as are triangles OPB and Bef are congruent. Curvature can be estimated by these relations; hence, Eq.…”

Section: Equation For Curvature Measurementmentioning

confidence: 92%

“…In fact, it is very effective on sharply curved tracks. The references provide additional information regarding the test results and conditions [9].…”

Section: Curvature Measuring Test and Analysismentioning

confidence: 99%

“…4. Assuming that the center of the leading and trailing bogies is located on a curvature, the following equation is satisfied: (9) where the angle of curve y can be expressed by the relation between curvature R as measured based on the center of the bogies and half of the distance L between two bogies.…”

Section: Equation For Curvature Measurementmentioning

confidence: 99%

“…However, the indirect method is less effective than the direct method. Various components are used to measure curvature, including global positioning systems, gyro sensors, acceleration sensors, and tachometers; but these components are inappropriate for many railway vehicles because of cost and effectiveness factors, including the maintenance of expensive equipment, environmental issues such as passing tunnels, and the numerous calibrations [9]. Thus, an active steering system should be developed for railway vehicles to operate successfully in practical situations.…”

Section: Introductionmentioning

confidence: 98%

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Study of the active radial steering of a railway vehicle using the curvature measuring method

et al. 2014

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This study assesses the capability of an active steering bogie to run effectively on a curved track. It presents a curvature measuring method that can be implemented in a railway vehicle system to steer a railway vehicle. This method was used to conduct a field test. The angle of attack and lateral force were reduced in a railway vehicle model on a curved track and analyzed. An active steering system was implemented to improve certain states when a railway vehicle runs on this track, such as wear and derailment index. The railway vehicle was also equipped with an active steering bogie to limit lateral contact forces and wear rates between the wheel and the rail. Finally, this paper describes the modeling of this active steering system and of a system to control the performance of a vehicle as it curves. Simulation results with this bogie were better than those obtained with a conventional railway vehicle, including in terms of lateral forces and the wear number of the wheels. Therefore, the proposed model is more effective than conventional systems with respect to operation on a curved track.

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Section: Equation For Curvature Measurementmentioning

confidence: 92%

“…In fact, it is very effective on sharply curved tracks. The references provide additional information regarding the test results and conditions [9].…”

Section: Curvature Measuring Test and Analysismentioning

confidence: 99%

Section: Equation For Curvature Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Study of the active radial steering of a railway vehicle using the curvature measuring method

et al. 2014

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“…This equipment employs the value generated from the difference in the displacements of the front and rear bogies with respect to the track. 15 However, in the present study, a measurement method is used for the radius of curvature. This method employs the relative angle and displacement between the body and the bogie on a curved track.…”

Section: Development Of Control Algorithmmentioning

confidence: 99%

Analysis of the active control of steering bogies for the dynamic characteristics on real track conditions

Hwang

Hur

Kim

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part F:

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In this study, an active steering bogie with a redesigned primary axial rubber spring for urban trains was developed. The applied axial rubber spring had a reasonable stiffness that can be achieved in the X, Y and Z directions. Therefore, the steering performance of the bogie can improve because of the lower longitudinal stiffness. The running performance of an active steering vehicle on a curved track was simulated by means of a co-simulation with VI-Rail and MATLAB/ Simulink. Further, a control algorithm was developed and applied to an actual active steering bogie. The radius of curvature acquired from the actual active steering bogie by the control algorithm was in reasonable agreement with that acquired from a track inspection vehicle. The numerical analysis revealed a significant improvement in the vehicle safety and ride quality and a reduction in the wheel-rail wear and noise. As a result, the validities of the developed primary suspension and control algorithm of the active steering bogie were confirmed. Further, this study may enable railway vehicles to run more stably and faster on sharp curves.

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Analysis on Steering Performance of Active Steering Bogie According to Steering Angle Control on Curved Section

2020

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In this paper, prior to the commercialization of a developed active steering bogie, we want to analyze steering performance experimentally according to steering angle level with the aim of obtaining steering performance data to derive practical design specifications for a steering system. In other words, the maximum steering performance can be obtained by controlling the steering angle at the 100% level of the target steering angle, but it is necessary to establish the practical control range in consideration of the steering system cost increase, size increase, and consumer steering performance requirements and commercialize. The steering control test using the active steering bogie was conducted in the section of the steep curve with a radius of curvature of R300, and steering performance such as bogie angle, wheel lateral force, and derailment coefficient were analyzed according to the steering angle level. As the steering angle level increased, the bogie indicated that it was aligned with the radial steering position, and steering performance such as wheel lateral force and derailment coefficient was improved. The steering control at 100% level of the target steering angle can achieve the highest performance of 83.6% reduction in wheel lateral force, but it can be reduced to about one-half of the conventional bogie at 25% level control and about one-third at 50% level. Considering cost rise by adopting the active steering system, this result can be used as a very important design indicator to compromise steering performance and cost rise issues in the design stage of the steering system from a viewpoint of commercialization. Therefore, it is expected that the results of the steering performance experiment according to the steering angle level in this paper will be used as very useful data for commercialization.

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Curvature Estimation Method of Curve Section Using Relative Displacement Between Body and Bogie of Rolling-stock

Cited by 6 publications

References 1 publication

Study of the active radial steering of a railway vehicle using the curvature measuring method

Study of the active radial steering of a railway vehicle using the curvature measuring method

Analysis of the active control of steering bogies for the dynamic characteristics on real track conditions

Analysis on Steering Performance of Active Steering Bogie According to Steering Angle Control on Curved Section

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