Nonlinear Analysis of Rail Vehicle Forced Lateral Response and Stability

1979 ◽  
Vol 101 (3) ◽  
pp. 230-237 ◽  
Author(s):  
J. Karl Hedrick ◽  
A. V. Arslan
Keyword(s):  
Nonlinear Analysis ◽  
Frequency Domain ◽  
Numerical Algorithm ◽  
Design Tool ◽  
Statistical Linearization ◽  
Rail Vehicle ◽  
Rail Vehicles ◽  
Lateral Response ◽  
Wheel Profile ◽  
Track Irregularities

The method of statistical linearization is presented as a design tool for rail vehicles that is capable of including fundamental nonlinearities such as wheel profile geometry and suspension nonlinearities. The method is capable of predicting the response of the vehicle to statistical track irregularities as well as the onset of hunting. The fundamentals of the method, an efficient frequency domain numerical algorithm for stationary response, and a design example are presented. The design example illustrates the influence of wheel profile, gage, track roughness, and suspension variations on vehicle response and stability.

Nonlinear Analysis of an Oscillating Wave Surge Converter in Frequency Domain via Statistical Linearization

2020 ◽  
Author(s):  
Leandro S. P. da Silva ◽  
Nataliia Y. Sergiienko ◽  
Benjamin S. Cazzolato ◽  
Boyin Ding ◽  
Celso P. Pesce ◽  
...  
Keyword(s):  
Nonlinear Analysis ◽  
Frequency Domain ◽  
Wave Energy ◽  
Numerical Models ◽  
Computational Cost ◽  
Viscous Drag ◽  
Design Parameters ◽  
Statistical Linearization ◽  
Mean Power ◽  
Energy Devices

Abstract Wave energy devices operate in resonant conditions to optimize power absorption, which leads to large displacements. As a result, nonlinearities play an important role in the system dynamics and must be accounted for in the numerical models for realistic prediction of the power generated. In general, time domain (TD) simulations are employed to capture the effects of the nonlinearities. However, the computational cost associated with these simulations is considerably higher compared to linear frequency domain (FD) methods. In this regard, the following work deals with the nonlinear analysis of an oscillating wave surge converter (OWSC) in the FD via the statistical linearization (SL) technique. Four nonlinearities for the proposed device are addressed: Coulomb-like torque regulated by the direction of motion, viscous drag torque, nonlinear buoyant net torque, and parametric excitation torque modulated by the flap angle. The reliability of the SL technique is compared with nonlinear TD simulations in terms of response probability distribution and power spectrum density (PSD) of the response and torque; and mean power produced. The results have demonstrated a good agreement between TD simulations and SL, while the computation time of the SL model is approximately 3 orders of magnitude faster. As a result, SL is a valuable tool to assess the OWSC performance under various wave scenarios over a range of design parameters, and can assist the development of such wave energy converters (WECs).

Nonlinear Analysis of an Oscillating Wave Surge Converter in Frequency Domain via Statistical Linearization

2021 ◽  
Author(s):  
Leandro Souza Pinheiro da Silva ◽  
Nataliia Sergiienko ◽  
Boyin Ding ◽  
Benjamin Cazzolato ◽  
Celso Pesce ◽  
...  
Keyword(s):  
Nonlinear Analysis ◽  
Frequency Domain ◽  
Statistical Linearization

On-Machine Measurement and Evaluation for the Turned Wheel Profile of Rail Vehicle

2021 ◽  
Vol 70 ◽  
pp. 1-11
Author(s):  
Fei Liu ◽  
Lin Liang ◽  
Guanghua Xu ◽  
Jianmin Wang ◽  
Chenggang Hou
Keyword(s):  
Rail Vehicle ◽  
Wheel Profile ◽  
Measurement And Evaluation

scholarly journals Effect of Rail Vehicle–Track Coupled Dynamics on Fatigue Failure of Coil Spring in a Suspension System

2021 ◽  
Vol 11 (6) ◽  
pp. 2650
Author(s):  
Sunil Kumar Sharma ◽  
Rakesh Chandmal Sharma ◽  
Jaesun Lee
Keyword(s):  
Mathematical Model ◽  
Fatigue Fracture ◽  
Suspension System ◽  
Railway Vehicle ◽  
Coil Spring ◽  
Internal Resonances ◽  
Rail Vehicle ◽  
Rail Vehicles ◽  
Stress Result ◽  
Wheel Track

In a rail vehicle, fatigue fracture causes a significant number of failures in the coil spring of the suspension system. In this work, the origin of these failures is examined by studying the rail wheel–track interaction, the modal analysis of the coil springs and the stresses induced during operation. The spring is tested experimentally, and a mathematical model is developed to show its force vs. displacement characteristics. A vertical 10-degree-of-freedom (DOF) mathematical model of a full-scale railway vehicle is developed, showing the motions of the car body, bogies and wheelsets, which are then combined with a track. The springs show internal resonances at nearly 50–60 Hz, where significant stresses are induced in them. From the stress result, the weakest position in the innerspring is identified and a few guidelines are proposed for the reduction of vibration and stress in rail vehicles.

scholarly journals Assessment of a rail vehicle running with the damaged wheel on a ride comfort for passengers

2018 ◽  
Vol 157 ◽  
pp. 03004 ◽  
Author(s):  
Ján Dižo ◽  
Miroslav Blatnický ◽  
Stasys Steišūnas ◽  
Blanka Skočilasová
Keyword(s):  
Ride Comfort ◽  
Railway Wheel ◽  
Rail Vehicle ◽  
Rail Vehicles ◽  
Dynamic Analyses ◽  
Wheel Flat

In certain conditions rail vehicles wheels can be during operation damaged. Then, the profile of wheels is no longer circular, but it is changed depending on the type and severity of defects. When such rail vehicle with the damaged wheel operates, the quality of a ride comfort for passenger is degraded. This article is focused on the assessment of ride comfort for passenger based on results obtained from dynamic analyses. Simulations and calculations were carried out in commercial multibody software. In our research we considered one type of the railway wheel untrueness – wheel-flat. This type of wheel damaging is relatively common and has such influence on the ride comfort for passenger worsening, which needs to be detected and investigated.

Effects of Independently Rolling Wheels on Flange Climb Derailment

2004 ◽  
Author(s):  
Nicholas Wilson ◽  
Xinggao Shu ◽  
Ken Kramp
Keyword(s):  
Dynamic Modeling ◽  
Light Rail ◽  
Technology Center ◽  
Rail Vehicles ◽  
Modeling Software ◽  
Wheel Profile ◽  
Profile Design ◽  
Flange Angle

The effects of independently rolling wheels (IRW) on flange climb derailment have been investigated through simulations using Transportation Technology Center, Inc. (TTCI)’s *NUCARSTM dynamic modeling software. Simulations of single wheelsets and hypothetcal light rail vehicles equipped with IRWs show that flange angle and flange length parameters play an important role in preventing derailments. That role is especially critical for independent rolling wheels due to their lack of self-steering capability. The speed contour concept was proposed for engineers to adopt the flange angle and flange length in a logical way for wheel profile design in new vehicles and wheel profile maintenance. It is also shown that the sensitivity of IRW to flange climb is also very dependent on particular vehicle designs.

Research on Running Stability of the Rail Vehicle Based on SIMPACK

2013 ◽  
Vol 328 ◽  
pp. 589-593
Author(s):  
Li Hua Wang ◽  
An Ning Huang ◽  
Guang Wei Liu
Keyword(s):  
Dynamic Model ◽  
Optimization Design ◽  
Dynamic Performance ◽  
Running Speed ◽  
Design And Optimization ◽  
Rail Vehicle ◽  
Body Dynamics ◽  
Multi Body ◽  
Body Dynamic ◽  
Track Irregularities

There are higher requirements on running stability of the rail vehicle with the incensement of the running speed. The running stability is one of the important indicators of evaluating the dynamic performance of the rail vehicle. In this paper, the whole multi-body dynamic model of the rail vehicle was proposed based on the theory of multi-body dynamics in the software of Simpack. And the lateral and vertical vibrate accelerations of the rail vehicle were simulated when it was inspired by the track irregularities. Then the running stabilities of the rail vehicle were estimated accurately. This will propose basis on the improving design and optimization design of the whole rail vehicle.

Selected issues of automation of rail vehicles operation

2019 ◽  
Vol 126 ◽  
pp. 75-85
Author(s):  
Emilia Koper ◽  
Andrzej Kochan ◽  
Przemysław Ilczuk
Keyword(s):  
Traffic Safety ◽  
Probability Estimation ◽  
Functional Classification ◽  
Legal Analysis ◽  
Vehicle Traffic ◽  
Rail Vehicle ◽  
Rail Vehicles ◽  
Scientific Technical

This article presents a synthesis of the assessment opportunities for the implementation of automation of rail vehicles in Poland. The evaluation was to identify the threats to the implementation of automation of the above mentioned vehicles and then to assign to them the effects and probabilities of occurrence. For the purpose of probability estimation, a review of selected scientific, technical, formal and legal sources was carried out. Definitions of grades of automation (GoA) were given, assigning technical and safety functionalities to them. Functional classification has been made with regard to traffic safety. The problem of passengers' and drivers' social feelings towards the introduction of automatic vehicles has been pointed out. A formal and legal analysis of the possibility of implementing automatic rail vehicle traffic in Poland was also carried out.

Selected issues of automation of rail vehicles operation

2019 ◽  
Vol 127 ◽  
pp. 37-47
Author(s):  
Emilia Koper ◽  
Andrzej Kochan ◽  
Przemysław Ilczuk
Keyword(s):  
Traffic Safety ◽  
Probability Estimation ◽  
Functional Classification ◽  
Legal Analysis ◽  
Vehicle Traffic ◽  
Rail Vehicle ◽  
Rail Vehicles ◽  
Scientific Technical

This article presents a synthesis of the assessment opportunities for implementing the automation of rail vehicles in Poland. The evaluation was to identify the threats to the automation of the above-mentioned vehicles and then assign to them the effects and probabilities of occurrence. A review of selected scientific, technical, formal, and legal sources was carried out for probability estimation. Definitions of Grades of Automation (GoA) were given, assigning technical and safety functionalities to them. The functional classification has been made concerning traffic safety. The problem of passengers' and drivers' social feelings towards introducing automatic vehicles has been pointed out. A formal and legal analysis of the possibility of implementing automatic rail vehicle traffic in Poland was also carried out.

Dynamics Analysis and Power Allocation Strategy Research for a New Hybrid Electric Urban Rail Vehicle

2013 ◽  
Vol 300-301 ◽  
pp. 93-98 ◽  
Author(s):  
Yan Qiu Chen ◽  
Ji Ye Zhang ◽  
Xiao Xi Chen ◽  
Ming Li
Keyword(s):  
Power Allocation ◽  
General Structure ◽  
Point Of View ◽  
Allocation Strategy ◽  
Electric Locomotive ◽  
Strategy Research ◽  
Rail Vehicle ◽  
Rail Vehicles ◽  
Urban Rail ◽  
Hybrid Electric

In order to improve the efficiency and environment-friendliness of urban rail vehicles, a new hybrid electric locomotive is proposed. The general structure of the proposed hybrid electric locomotive is given and analyzed from a dynamics point of view. The calculation method of power output and its allocation strategy is discussed. A simulation is conducted in HELSP(Hybrid Electric Locomotive Simulation Platform) to verify the performance of the power allocation strategy. The result indicates that the function of allocating power can be properly realized, and the regeneration energy from frequent braking can be absorbed by the power storage of the vehicle.

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