scholarly journals Improvement of Ride Quality of Railway Vehicle by Semiactive Secondary Suspension System on Roller Rig Using Magnetorheological Damper

2014 ◽  
Vol 6 ◽  
pp. 298382 ◽  
Author(s):  
Yu-Jeong Shin ◽  
Won-Hee You ◽  
Hyun-Moo Hur ◽  
Joon-Hyuk Park ◽  
Gyu-Seop Lee
Keyword(s):  
Suspension System ◽  
Magnetorheological Damper ◽  
Ride Quality ◽  
Railway Vehicle ◽  
Roller Rig ◽  
Secondary Suspension

Ride comfort of a higher speed rail vehicle using a magnetorheological suspension system

2017 ◽  
Vol 232 (1) ◽  
pp. 32-48 ◽  
Author(s):  
Sunil Kumar Sharma ◽  
Anil Kumar
Keyword(s):  
Ride Comfort ◽  
Suspension System ◽  
Magnetorheological Damper ◽  
Ride Quality ◽  
Railway Vehicle ◽  
Passive Suspension ◽  
Railway Vehicles ◽  
Rail Vehicle ◽  
Passive Suspension System ◽  
Secondary Suspension

In a railway vehicle, vibrations are generated due to the interaction between wheel and track. To evaluate the effect of vibrations on the ride quality and comfort of a passenger vehicle, the Sperling's ride index method is frequently adopted. This paper focuses on the feasibility of improving the ride quality and comfort of railway vehicles using semiactive secondary suspension based on magnetorheological fluid dampers. Equations of vertical, pitch and roll motions of car body and bogies are developed for an existing rail vehicle. Moreover, nonlinear stiffness and damping functions of passive suspension system are extracted from experimental data. In view of improvement in the ride quality and comfort of the rail vehicle, a magnetorheological damper is integrated in the secondary vertical suspension system. Parameters of the magnetorheological damper depend on current, amplitude and frequency of excitations. Three semi-active suspension strategies with magnetorheological damper are analysed at different running speeds and for periodic track irregularity. The performance indices calculated at different semi-active strategies are juxtaposed with the nonlinear passive suspension system. Simulation results establish that magnetorheological damper strategies in the secondary suspension system of railway vehicles reduce the vertical vibrations to a great extent compared to the existing passive system. Moreover, they lead to improved ride quality and passenger comfort.

Design and Analysis of Magnetorheological Dampers for Train Suspension

2005 ◽  
Vol 219 (4) ◽  
pp. 261-276 ◽  
Author(s):  
Y K Lau ◽  
W H Liao
Keyword(s):  
Mr Damper ◽  
Suspension System ◽  
Ride Quality ◽  
Railway Vehicle ◽  
Suspension Systems ◽  
Mr Dampers ◽  
Fluid Damper ◽  
Secondary Suspension ◽  
Mr Fluid Damper

This article aims at designing a magnetorheological (MR) fluid damper that is suitable for a semi-active train suspension system in order to improve its ride quality. A double-ended MR damper is designed, fabricated, and tested. Simulation is carried out by integrating the MR damper model in the secondary suspension of a full-scale railway vehicle model. The feasibility and effectiveness of the semi-active train suspension system with the developed MR dampers are investigated by comparing the controlled performances of the MR suspension system with different passive suspension systems. The results show that the semi-active suspension with the developed MR dampers can substantially improve the ride quality of the passengers.

A ride quality evaluation of a semi-active railway vehicle suspension system with MR damper: Railway field tests

2016 ◽  
Vol 231 (3) ◽  
pp. 306-316 ◽  
Author(s):  
Hwan-Choong Kim ◽  
Yu-Jeong Shin ◽  
Wonhee You ◽  
Kyu Chul Jung ◽  
Jong-Seok Oh ◽  
...  
Keyword(s):  
Field Tests ◽  
Mr Damper ◽  
Suspension System ◽  
Ride Quality ◽  
Railway Vehicle ◽  
Damping Force ◽  
Magneto Rheological ◽  
Vehicle Suspension System ◽  
Design And Manufacture

This work presents experimental assessment of the improvements to the horizontal ride quality of a railway vehicle equipped with a semi-active magneto-rheological (MR) suspension system. The assessment includes the development of a mathematical model and magnetic circuit analysis of the MR damper, the design and manufacture of MR damper, and field test on the railway. After evaluating the field-dependent damping force characteristics, the conventional passive dampers of the operational railway vehicle are replaced with the MR dampers to evaluate horizontal dynamic characteristics that directly indicates the ride quality of the railway vehicle. Various sensors are installed in the vehicle and a skyhook controller with semi-active condition is implemented to produce an appropriate input current for the generation of the desired damping force. Three periods of testing are undertaken on the railway bridge at 120 km/h and the measured data of acceleration level are recoded and presented. It is demonstrated from the measured results that the vibration can be effectively controlled by the proposed semi-active MR suspension system associated with the skyhook controller. Finally, from the vibration control responses the horizontal ride quality of railway vehicle is evaluated and presented in frequency domain.

Non-Parametric Modelling and Validation of Magnetorheological Damper for Lateral Suspension of Railway Vehicle Using Interpolated Sixth Order Polynomial

2014 ◽  
Vol 699 ◽  
pp. 283-288
Author(s):  
Mohamad Hafiz Harun ◽  
Fauzi Ahmad ◽  
Mohd Razali Md Yunos ◽  
Ahmad Kamal Mat Yamin
Keyword(s):  
Ride Comfort ◽  
Mr Damper ◽  
Active Suspension ◽  
Suspension System ◽  
Magnetorheological Damper ◽  
Sixth Order ◽  
Railway Vehicle ◽  
Parametric Modelling ◽  
Track Maintenance ◽  
Order Polynomial

Passenger ride comfort is an important factor in railway vehicle services. However, passenger ride comfort is sometimes affected by the vibrations resulting from the track irregularities. It will be critical when the track is exposed to prolonged sun’s heat and lack of track maintenance. This means that the optimization of passive suspension parameters alone could not cope with these cases. Semi-active suspension system for railway vehicles has been developed as a way to solve these problems. The technology of semi-active suspension is widely used especially in the railway vehicle application. Magnetorheological (MR) damper is one of the applications of the concept of semi-active suspension. However, there are a variety of criteria for MR dampers based on usage. To meet the requirements of railway vehicle suspension system, a MR damper have been developed. The criteria for the MR damper are obtained experimentally. Then, the model for the MR damper is developed using Interpolated Sixth Order Polynomial and validated by experimental. The MR damper model has shown improvement, especially in the railway vehicle dynamics performance.

Study on Influences of Air Spring Failures on Ride Quality of High-Speed Railway Trains

2013 ◽  
Vol 420 ◽  
pp. 9-15 ◽  
Author(s):  
Dao Gong ◽  
Wen Jing Sun ◽  
Jin Song Zhou
Keyword(s):  
High Speed ◽  
Ride Quality ◽  
Railway Vehicle ◽  
Air Spring ◽  
High Speed Railway ◽  
Damping Characteristics ◽  
Secondary Support ◽  
Sudden Release ◽  
Straight Lines

A refined non-linear air spring model of railway vehicle model is established in this paper and the influences of different air spring failures on ride quality are studied. Results show that the orifice failure makes the air spring loses damping characteristics and deteriorates the vehicle ride quality; The failure of levelling valve has little influence on the ride quality when vehicle running on straight lines; The fracture of air spring diaphragm results in a sudden release of air, and car body secondary support disappears rapidly, excessive wheel unloading will happen and which can easily lead to derailment. In addition, the longer the leakage process, the less the influence on vehicle safety.

Hybrid Skyhook-Stability Augmentation System for Ride Quality Improvement of Railway Vehicle

2014 ◽  
Vol 663 ◽  
pp. 141-145
Author(s):  
Mohd Hanif Harun ◽  
W.Mohd Zailimi Wan Abdullah ◽  
Hishamuddin Jamaluddin ◽  
Roslan Abd Rahman ◽  
Khisbullah Hudha
Keyword(s):  
Degrees Of Freedom ◽  
Active Suspension ◽  
Sine Wave ◽  
Vehicle Body ◽  
Ride Quality ◽  
Railway Vehicle ◽  
Suspension Systems ◽  
Stability Augmentation ◽  
Ride Control

This paper is aimed to show the improvement of ride quality of railway vehicle with semi-active suspension systems. The dynamics of nine degrees-of-freedom (9-DOF) railway vehicle model is developed consists of a vehicle body, two bogies and four wheel-set. The disturbance considered is track irregularity which is modelled as a sine wave. The control algorithm for the semi-active suspension system is developed based on Stability Augmentation System (SAS) integrated with skyhook controller to reduce the effect of track disturbance. The performances of passive and semi-active suspension are compared by simulation using MATLAB-SIMULINK software. The results of the study show that the proposed controller is able to significantly improve ride quality of railway vehicle body. It is also noted that the additional ride control loop which is skyhook control is able to further improve the performance of SAS controller for the system.

Dynamic Analysis and Ride Quality Evaluation of Railway Vehicles – Numerical Simulation and Field Test Verification

2006 ◽  
Vol 22 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Y.-T. Fan ◽  
W.-F. Wu
Keyword(s):  
Field Test ◽  
Role Model ◽  
Vertical Direction ◽  
Ride Quality ◽  
Railway Vehicle ◽  
Rapid Transit ◽  
Transit System ◽  
Railway Vehicles ◽  
Proposed Model

AbstractA rather complete dynamic model with special emphases on nonlinear conicity and creep force and in consideration of random irregularity of rail profile is proposed to simulate the response and investigate the ride quality of railway vehicles. The CP341 vehicle that will soon be used in Taipei Rapid Transit System is considered in particular as the studied role model. Some of the field test data carried out for this type of vehicle are revealed as well and used for the verification of the proposed model. Both simulation and test results show that the resonant frequency of the studied vehicle is in the range of 0.6∼1 Hz, and the one-third octave root-mean-square acceleration curves of the vehicle in all studied cases meet the ride quality criteria set for the mass rapid transit vehicle systems. It is observed that the secondary suspension of the vehicle has the low frequency filtering property and the primary suspension has high frequency characteristics. A poorer ride quality in vertical direction rather than in lateral direction is also confirmed in the study. It is concluded that the proposed model can be used to simulate the dynamic response and evaluate the ride quality of any railway vehicle.

scholarly journals The use of a linear half-vehicle model for the optimization of damping in the passive suspension system of a railway car

2016 ◽  
Vol 39 (3) ◽  
pp. 31-49 ◽  
Author(s):  
Zbigniew Lozia ◽  
Ewa Kardas-Cinal
Keyword(s):  
Suspension System ◽  
Motor Vehicles ◽  
Railway Vehicle ◽  
Vehicle Model ◽  
Passive Suspension ◽  
Linear Damping ◽  
Passive Suspension System ◽  
Secondary Suspension ◽  
Stiffness And Damping ◽  
Selection Of

The paper presents a methodology of optimizing the parameters of the passive suspension system of a railway vehicle. A linear half-vehicle model and an example of the procedure carried out to optimize a selected parameter of the model have been demonstrated. A method of the selection of damping in the suspension system of a railway vehicle, based on over 40-year achievements of the cited authors of publications in the field of motor vehicles, has been shown. The optimization of linear damping in the secondary suspension system of a passenger carriage moving on a track with random profile irregularities has been described in detail. The algorithms adopted for the calculations have a wider range of applicability; especially, they may be used for determining the optimum values of the other parameters of the railway vehicle model under analysis, i.e. stiffness of the secondary suspension system as well as stiffness and damping of the primary suspension system.

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