Sharp Curve Negotiation Analysis of Tramcar Vehicles with Different Bogie Architectures

2012 ◽  
Author(s):  
R. Corradi ◽  
G. Diana ◽  
A. Facchinetti
Keyword(s):  
Negotiation Analysis ◽  
Curve Negotiation

scholarly journals Analysis of Track Gauge Widening in Curves with Small Radius

2015 ◽  
Vol 725-726 ◽  
pp. 967-973 ◽  
Author(s):  
Zdenka Popović ◽  
Luka Lazerević ◽  
Nikolay Vatin
Keyword(s):  
Large Distance ◽  
Small Radius ◽  
Negotiation Analysis ◽  
Lateral Forces ◽  
Curve Negotiation

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.

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

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.

Negotiation analysis. (Ed.) H. Peyton Young

1994 ◽  
Vol 15 (3) ◽  
pp. 289-291
Author(s):  
Judi Mclean Parks
Keyword(s):  
Negotiation Analysis

scholarly journals Curve Negotiation: Identifying Driver Behavior Around Curves with the Driver Performance Database

2009 ◽  
Author(s):  
Anna Mikolajetz ◽  
Matthias J Henning ◽  
Axel Tenzer ◽  
Robert Zobel ◽  
Josef F Krems ◽  
...  
Keyword(s):  
Driver Behavior ◽  
Driver Performance ◽  
Curve Negotiation

Negotiation Theory and the Intifadat

2015 ◽  
Vol 20 (1) ◽  
pp. 109-128 ◽  
Author(s):  
I. William Zartman
Keyword(s):  
Arab Spring ◽  
Three Dimensional ◽  
Ideal Type ◽  
Type Model ◽  
Negotiation Analysis ◽  
Negotiation Theory ◽  
Integrative Negotiation ◽  
The Arab Spring

The evolution of the Arab Spring in eight countries is primarily a matter of negotiation. The instances can be broken down into Short Track (Tunisia, Egypt) and Long Track (Syria, Libya, Yemen) Transitions and Short Track (Algeria, Morocco, Bahrain) Reactions. They bring a number of lessons for negotiation analysis, primarily on scope and power, and their deviation from an ideal type model can be explained by the predominance of distributive over integrative negotiation and the imposition of a three-dimensional scene for negotiation and legitimization, with an Islamic dimension overlaying the usual left-right spectrum.

Obstacle negotiation analysis of track-legged robot based on terramechanics

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zhu Hongbiao ◽  
Yueming Liu ◽  
Weidong Wang ◽  
Zhijiang Du
Keyword(s):  
Kinematic Model ◽  
Interaction Model ◽  
Experimental Results ◽  
Physical Parameters ◽  
Negotiation Analysis ◽  
Content Type ◽  
Practical Applications ◽  
Loose Soil ◽  
Key Steps ◽  
Drawbar Pull

Purpose This paper aims to present a new method to analyze the robot’s obstacle negotiation based on the terramechanics, where the terrain physical parameters, the sinkage and the slippage of the robot are taken into account, to enhance the robot’s trafficability. Design/methodology/approach In this paper, terramechanics is used in motion planning for all-terrain obstacle negotiation. First, wheel/track-terrain interaction models are established and used to analyze traction performances in different locomotion modes of the reconfigurable robot. Next, several key steps of obstacle-climbing are reanalyzed and the sinkage, the slippage and the drawbar pull are obtained by the models in these steps. In addition, an obstacle negotiation analysis method on loose soil is proposed. Finally, experiments in different locomotion modes are conducted and the results demonstrate that the model is more suitable for practical applications than the center of gravity (CoG) kinematic model. Findings Using the traction performance experimental platform, the relationships between the drawbar pull and the slippage in different locomotion modes are obtained, and then the traction performances are obtained. The experimental results show that the relationships obtained by the models are in good agreement with the measured. The obstacle-climbing experiments are carried out to confirm the availability of the method, and the experimental results demonstrate that the model is more suitable for practical applications than the CoG kinematic model. Originality/value Comparing with the results without considering Terramechanics, obstacle-negotiation analysis based on the proposed track-terrain interaction model considering Terramechanics is much more accurate than without considering Terramechanics.

Improvement on Curve Negotiation Performance of Suspended Monorail Vehicle Considering Flexible Guideway

2020 ◽  
Vol 20 (05) ◽  
pp. 2050057
Author(s):  
Qinglie He ◽  
Chengbiao Cai ◽  
Shengyang Zhu ◽  
Kaiyun Wang ◽  
Yongzhi Jiang ◽  
...  
Keyword(s):  
Interaction Model ◽  
Dynamic Responses ◽  
Secondary Development ◽  
Design Parameters ◽  
Lateral Vibration ◽  
Vibration Level ◽  
Radial Stiffness ◽  
Negotiation Performance ◽  
Lateral Displacements ◽  
Curve Negotiation

This work presents the investigation and improvement on curve negotiation performance of suspended monorail vehicle considering a flexible guideway. First, a spatial train–guideway interaction model of suspended monorail system (SMS) is established based on the secondary development of ANSYS software. Then, the dynamic analysis of the train over the flexible curved guideway is conducted, and the curve negotiation performance of the vehicle and the guideway vibration feature are revealed. Subsequently, several crucial design parameters that significantly influence the curve negotiation performance of the vehicle are found, and their influences on the train–guideway dynamic responses are systematically investigated. Finally, by comprehensively considering the dynamic indexes of the vehicle–guideway system, the optimal ranges of these crucial design parameters are obtained. Results show that decreasing the radial stiffness of guiding tyre can effectively reduce the lateral vibration levels of vehicle and guideway, but it would increase the lateral displacements of the bogie and hanging beam; and the radial stiffness is finally suggested to be around 1[Formula: see text]kN/mm by comprehensively considering all dynamic indexes. Increasing the initial compression displacement of guiding tyre can well limit the lateral displacements of the bogie and the hanging beam, thus enhancing the train running safety; however, it would intensify the vehicle-guideway lateral vibration level; especially, the optimal initial compression displacement of guiding tyre is related to its radial stiffness characteristics. To ensure a good curve negotiation performance of vehicle and guideway vibration level, the stiffness of the anti-roll torsion bar and the initial gradient angle of the installed trapezoid four-link suspended device are suggested to be 1.0[Formula: see text]MNm/rad and 65–[Formula: see text], respectively.

A Practical Model of Rail Vehicle Curve Negotiation

1981 ◽  
Vol 10 (2-3) ◽  
pp. 117-119
Author(s):  
P. P. MARCOTTE ◽  
K. J. R. MATHEWSON ◽  
R. YOUNG
Keyword(s):  
Rail Vehicle ◽  
Practical Model ◽  
Curve Negotiation
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