Construction of Seat Model for Improving Ride Comfort on High Speed Railway

Polyurethane-reinforced ballasted track (PRBT) can improve the integrity of ballasted track structures and satisfy the high-stability requirements of high-speed railways. In this study, the quality evolution law of PRBT structures after being launched into train service was analyzed, and a reference for structural optimization and maintenance operation was provided. The track geometric state of the PRBT test section of a high-speed railway was measured and monitored for nearly one year after it was launched into operation, and the ballastless track of the adjacent section was selected as a reference. The geometric states of the tracks were evaluated and compared using various parameters, including sliding standard deviation, average standard deviation, and track irregularity spectrum density. Results show that the track quality indexes of the test section, which were in operation for nearly one year, were slightly over the limit. Moreover, the fastener can be finely adjusted for the high-value index sections to further improve the ride comfort. The application effect of PRBT in the subgrade fracture zone was good, which could satisfy the requirements of high-quality transportation as well as the normal operation and maintenance of high-speed railway.

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Evaluating the Effect of Wheel Polygons on Dynamic Track Performance in High-Speed Railway Systems Using Co-Simulation Analysis

Applied Sciences ◽

10.3390/app9194165 ◽

2019 ◽

Vol 9 (19) ◽

pp. 4165 ◽

Cited By ~ 4

Author(s):

Song ◽

Du ◽

Zhang ◽

Sun

Keyword(s):

High Speed ◽

Ride Comfort ◽

Concrete Slab ◽

Equivalent Stress ◽

Dynamic Responses ◽

Traffic Density ◽

Harmonic Order ◽

High Speed Railway ◽

Von Mises Equivalent Stress ◽

Von Mises

With increases in train speed and traffic density, problems due to wheel polygons and those caused by wheel–rail impacts will increase accordingly, which will affect train operational safety and passenger ride comfort. This paper investigates the effects of polygonal wheels on the dynamic performance of the track in a high-speed railway system. The wheel–rail interaction forces caused by wheel polygons are determined using a dynamic vehicle–track model, and the results are entered into a slab track finite element model. The influence of the harmonic order and out-of-roundness (OOR) amplitude of wheel polygons on the transient dynamic characteristics of the track(von Mises equivalent stress, displacement, and acceleration) is examined under high-speed conditions. The results indicate that the vibration acceleration and von Mises equivalent stress of the rail increase in proportion to the harmonic order and the OOR amplitude and velocity of a polygonized wheel. The vibration displacement of the rail first increases and then decreases with a change in the harmonic order, and reaches a maximum at the ninth order. The dynamic responses of the concrete slab layer, cement-asphalt layer, and support layer increase linearly with the harmonic order and amplitude of wheel polygons and decrease from top to bottom. Through a combination of numerical simulations and real-time monitoring of rail vibrations, this study provides guidance on potential sensor locations to identify polygonized wheels before they fail.

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Effect of elastic rubber mats on the reduction of vibration and noise in high-speed elevated railway systems

Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail and Rapid Transit ◽

10.1177/0954409717752201 ◽

2018 ◽

Vol 232 (6) ◽

pp. 1837-1851 ◽

Cited By ~ 2

Author(s):

Caiyou Zhao ◽

Wang Ping

Keyword(s):

High Speed ◽

Ride Comfort ◽

Environmental Noise ◽

Interior Noise ◽

Control Effect ◽

High Speed Railway ◽

Noise And Vibration ◽

Railway Systems ◽

Railway System ◽

Elastic Rubber

In the development of a high-speed railway system, controlling the vibration and noise caused by the system plays an important issue, since the vibration and noise have an influence on the surrounding environment. This study describes the field experiment conducted in September 2015 on the Chengdu–Dujiangyan high-speed railway system where elastic rubber mats – the only countermeasure that is currently applied to reduce vibration and noise in high-speed elevated railway systems in China – were installed in September 2010. The effects of mats under the tracks on noise and vibration were evaluated and analyzed systematically compared to the tracks without mats in the following three aspects: vertical wheel–rail forces; vibration characteristics of the track system, bridge, and ground in combination with the environmental noise characteristics in several frequency domains; and the ride comfort and the interior noise of the vehicle. The results indicate that mats have a negligible effect on the vertical wheel–rail forces, ride comfort, and the interior noise of the vehicle. However, even though they significantly reduce the vibration of the base slab, bridge, and the ground below the mats, vibration of the rails and track slabs above the mats is increased, especially at low frequencies. Mats can also effectively reduce the bridge-borne noise but have little influence on the far-field noise. Furthermore, their control effect on environmental noise and vibration was evaluated in September 2010 and September 2015, showing that mats could effectively minimize the environmental vibration and bridge-borne noise after five years of practical operation, although their control effect declined as their stiffness increased.

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Vibration control and electromagnetic interference analysis of high-speed railway vehicle system with magneto-rheological damper

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-209463 ◽

2020 ◽

Vol 64 (1-4) ◽

pp. 1439-1445

Author(s):

Xinna Ma ◽

Shaopu Yang ◽

Wenrui Shi

Keyword(s):

Electromagnetic Interference ◽

High Speed ◽

Ride Comfort ◽

Adaptive Fuzzy Control ◽

Mr Damper ◽

Railway Vehicle ◽

High Speed Railway ◽

Mr Dampers ◽

Vehicle System ◽

Magneto Rheological

With running speed increases, the dynamics characteristic of railway vehicle system behaves intensively, such as, snaking motion, bifurcation problem, even digression accident. These questions effect ride comfort and run stationary. The magneto-rheological (MR) damper can continually change its state in a few milliseconds and has low energy requirement and insensitivity to the temperature and circumstance. MR dampers have turned out to be a promising device in vibration control. According to the nonlinear of MR damper and the vibration characteristic of semi-active suspension of high-speed vehicle, a seventeen-degree-of-freedom lateral semi-control model of high-speed whole vehicle with MR dampers is established. Taking into account of the vibrations of vehicle and electromagnetic interference, a novel adaptive fuzzy control strategy is put forward. The simulation results show that adaptive fuzzy control method can improve the ride comfort and restrain electromagnetic interference. The electromagnetic interference noise problems in high-speed railway vehicle system with MRD are analyzed and discussed according to EN 55022 for the first time.

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Vibration and Ride Comfort Analysis by Using Passenger-Seat Dynamics Models in High Speed Railway Vehicle

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C ◽

10.1299/kikaic.79.3177 ◽

2013 ◽

Vol 79 (805) ◽

pp. 3177-3191 ◽

Cited By ~ 3

Author(s):

Sotaro SAITO ◽

Pongsathorn RAKSINCHAROENSAK ◽

Masao NAGAI ◽

Ryuzo HAYASHI ◽

Ryohei SHIMAMUNE ◽

...

Keyword(s):

High Speed ◽

Ride Comfort ◽

Railway Vehicle ◽

High Speed Railway ◽

Passenger Seat ◽

Dynamics Models

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Experimental Analysis of Ride Comfort Quality for High-speed Railway Vehicles

Journal of Physics Conference Series ◽

10.1088/1742-6596/1653/1/012065 ◽

2020 ◽

Vol 1653 ◽

pp. 012065

Author(s):

Jiangwei Huang ◽

Sijie Chen

Keyword(s):

Experimental Analysis ◽

High Speed ◽

Ride Comfort ◽

High Speed Railway ◽

Railway Vehicles

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Railway Dynamics Analysis Using Lego Mindstorms

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.465-466.13 ◽

2013 ◽

Vol 465-466 ◽

pp. 13-17

Author(s):

Mohd Azman Abdullah ◽

Faiz Redza Ramli ◽

Chin Sheng Lim

Keyword(s):

Vehicle Dynamics ◽

High Speed ◽

Ride Comfort ◽

Low Cost ◽

Railway Vehicle ◽

Kuala Lumpur ◽

Data Logging ◽

High Speed Railway ◽

Vehicle Data ◽

Lego Mindstorms

In recent years, the high speed railway vehicle dynamics performances have been studied and investigated in order to determine the ride comfort of the passengers. Most of the time, these researches were involving expensive and high end technology of data logging system to record and analyze the data. In this research, a low cost data logging system (Lego Mindstorms) is used to gather the data from accelerometer and gyro during experimentation. The study about the behaviour of railway vehicle in term of roll and vibrations at three perpendicular axes during running at the curve track is performed. Actual field run of railway vehicle data collection is performed on the available high speed railway vehicle operating from Kuala Lumpur International Airport (KLIA) to the Kuala Lumpur (KL) Sentral. The route selected consists of several curves which are important to study the dynamics performance of the vehicle. The results from experiment establishes the dynamics performances of the railway vehicle in term of passengers ride comfort. With the availability of the data logging system and sensors, the railway vehicle dynamics performance can be analyzed and monitored for future improvement of railway vehicle service and operation.

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