Flexible moving track model for curve negotiation analysis of railroad vehicles with rail roll deflection

In this paper it was performed curve negotiation analysis of three axle bogie of locomotive type JŽ 461. This locomotive has large distance between first and middle i.e. middle and last axle, which leads to increased lateral forces during curve negotiation. Final result might be widening of track gauge in curves with small radius. This paper points that Infrastructure Manager must take into account vehicle performances and type of track when defines track gauge in curves.

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Dynamics of Independently Rotating Wheel System in the Analysis of Multibody Railroad Vehicles

Journal of Computational and Nonlinear Dynamics ◽

10.1115/1.4002089 ◽

2010 ◽

Vol 6 (1) ◽

Cited By ~ 5

Author(s):

Hiroyuki Sugiyama ◽

Ryosuke Matsumura ◽

Yoshihiro Suda ◽

Hideaki Ezaki

Keyword(s):

Front Axle ◽

Light Rail ◽

Velocity Transformation ◽

Railroad Vehicles ◽

Wheel Rolling ◽

Longitudinal Slip ◽

Hunting Stability ◽

Multibody Dynamics Model ◽

Good Agreement ◽

Curve Negotiation

In this investigation, dynamic characteristics of independently rotating wheel systems are discussed. To this end, a multibody independently rotating wheelset (IRW) model is developed using the method of velocity transformation. The linear stability analysis of a two-axle IRW truck is performed, the hunting stability and vibration characteristics of IRW truck are investigated, and the results are compared with those obtained using the multibody dynamics model. Good agreement is obtained in hunting frequencies and critical speeds. It is shown using the linear IRW equations that since a constant forward speed is assumed for IRW, the longitudinal slip can occur due to the change in the wheel rolling radius. This leads to longitudinal creep forces even in the case of IRW and it contributes to a coupling of the lateral, yaw, and pitch motions of IRW. Furthermore, it is observed in several numerical examples that, due to small self-centering forces of IRW, continuous flange contact occurs on tangent track, while in curve negotiation, flange contacts on outer wheel of the front axle, as well as that on inner wheel of the rear axle, occur. Such an effect can be more significant when sharp curve negotiation is considered as encountered in light rail vehicle applications.

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Development of Quasi-static Curve Negotiation Analysis Procedure Considering Hysteretic Behavior of Air Suspension Systems

Quarterly Report of RTRI ◽

10.2219/rtriqr.62.2_143 ◽

2021 ◽

Vol 62 (2) ◽

pp. 143-148

Author(s):

Takayuki TANAKA ◽

Hiroyuki SUGIYAMA

Keyword(s):

Analysis Procedure ◽

Hysteretic Behavior ◽

Negotiation Analysis ◽

Suspension Systems ◽

Air Suspension ◽

Curve Negotiation

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Prediction of railway wheel load unbalance induced by air suspension leveling valves using quasi-steady curve negotiation analysis procedure

Proceedings of the Institution of Mechanical Engineers Part K Journal of Multi-body Dynamics ◽

10.1177/1464419319867179 ◽

2019 ◽

Vol 234 (1) ◽

pp. 19-37

Author(s):

Takayuki Tanaka ◽

Hiroyuki Sugiyama

Keyword(s):

Dynamic Simulation ◽

Safety Evaluation ◽

Analysis Procedure ◽

Small Radius ◽

Computational Time ◽

Negotiation Analysis ◽

Wheel Load ◽

Air Suspension ◽

Vehicle Motion ◽

Curve Negotiation

While air suspensions are widely utilized for passenger railway vehicles as secondary suspension, initial lever angle setting of the air spring levelling valve can make a non-negligible impact on the residual wheel load unbalance in curve negotiation on small radius curved tracks. To enable accurate and quick prediction of the levelling valve-induced residual wheel load unbalance for vehicle safety evaluation, this study proposes a new quasi-steady curve negotiation analysis procedure considering the detailed thermodynamic air suspension system model that accounts for the nonlinear airflow characteristics of levelling valve and differential pressure valves. This approach allows for eliminating a limitation of existing full dynamic simulation models associated with high computational intensity that prevents quick safety evaluation with long-distance simulation under actual railway operating scenarios. A co-simulation scheme for the quasi-steady vehicle motion solver is also proposed to further improve the computational efficiency with explicit force–displacement coupling. Several numerical examples are presented to demonstrate the proposed quasi-steady vehicle motion solver for prediction of levelling valve-induced residual wheel load unbalances in small radius curved tracks. The numerical results are compared with those of the dynamic simulation model and validated against the test data. It is demonstrated that computational time is substantially decreased by the proposed approach while accurately predicting the levelling valve-induced residual wheel load unbalance caused by the initial offset of lever angles on small radius curved tracks.

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Modeling Multi-Point Wheel/Rail Contact in the Analysis of Turnout Negotiation of Multibody Railroad Vehicles

Volume 11: Transportation Systems ◽

10.1115/imece2012-89722 ◽

2012 ◽

Author(s):

Akihiro Terao ◽

Hiroyuki Sugiyama

Keyword(s):

Numerical Procedure ◽

Numerical Results ◽

Elastic Contact ◽

Cross Sectional ◽

Railroad Vehicles ◽

Curve Negotiation

In this investigation, a numerical procedure that accounts for multipoint contact for the analysis of vehicle/turnout interactions is developed. To this end, the multiple look-up contact table approach that can be used for modeling the change in the rail cross sectional shapes on turnout along the track is generalized for multipoint contact scenarios. The numerical results are compared with those of the online constraint/elastic contact approach for the analysis of curve negotiation first, and then it is demonstrated that the numerical procedure developed in this investigation can be used for predicting the multipoint contact between the wheel and rail for the analysis of vehicle/turnout interactions.

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Wireless power transfer for high-precision position detection of railroad vehicles

2015 IEEE Power, Communication and Information Technology Conference (PCITC) ◽

10.1109/pcitc.2015.7438069 ◽

2015 ◽

Author(s):

Hyun-Gyu Ryu ◽

Dongsoo Har

Keyword(s):

High Precision ◽

Wireless Power Transfer ◽

Power Transfer ◽

Wireless Power ◽

Railroad Vehicles ◽

Position Detection

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A Study of the Lateral Stability of Railroad Vehicles Using a Nonlinear Constrained Multibody Formulation

10.1115/imece2001/rtd-25704 ◽

2001 ◽

Author(s):

Davide Valtorta ◽

Khaled E. Zaazaa ◽

Ahmed A. Shabana ◽

Jalil R. Sany

Keyword(s):

Stability Analysis ◽

Linear Stability ◽

Linear Theory ◽

Linear Stability Analysis ◽

Numerical Study ◽

Operating Conditions ◽

Lateral Stability ◽

Railroad Vehicles ◽

Contact Formulation ◽

The Stability

Abstract The lateral stability of railroad vehicles travelling on tangent tracks is one of the important problems that has been the subject of extensive research since the nineteenth century. Early detailed studies of this problem in the twentieth century are the work of Carter and Rocard on the stability of locomotives. The linear theory for the lateral stability analysis has been extensively used in the past and can give good results under certain operating conditions. In this paper, the results obtained using a linear stability analysis are compared with the results obtained using a general nonlinear multibody methodology. In the linear stability analysis, the sources of the instability are investigated using Liapunov’s linear theory and the eigenvalue analysis for a simple wheelset model on a tangent track. The effects of the stiffness of the primary and secondary suspensions on the stability results are investigated. The results obtained for the simple model using the linear approach are compared with the results obtained using a new nonlinear multibody based constrained wheel/rail contact formulation. This comparative numerical study can be used to validate the use of the constrained wheel/rail contact formulation in the study of lateral stability. Similar studies can be used in the future to define the limitations of the linear theory under general operating conditions.

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