scholarly journals A study of the lateral dynamic behaviour of high speed railway viaducts and its effect on vehicle ride comfort and stability

2008 ◽  
Author(s):  
F Gabald√≥n ◽  
J Nasarre ◽  
M Cuadrado ◽  
R Dias ◽  
P Gonzalez ◽  
...  
Keyword(s):  
High Speed ◽  
Dynamic Behaviour ◽  
Ride Comfort ◽  
High Speed Railway

Analysis on the track quality evolution law of polyurethane-reinforced ballasted track in high-speed railway

2020 ◽  
pp. 095440972097557
Author(s):  
Jie-Ling Xiao ◽  
Pu Jing ◽  
Si-Xin Yu ◽  
Ping Wang
Keyword(s):  
Standard Deviation ◽  
Test Section ◽  
High Speed ◽  
Ride Comfort ◽  
Normal Operation ◽  
High Speed Railway ◽  
Evolution Law ◽  
Ballasted Track ◽  
One Year ◽  
Track Quality

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.

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

2019 ◽  
Vol 9 (19) ◽  
pp. 4165 ◽  
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.

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

2018 ◽  
Vol 232 (6) ◽  
pp. 1837-1851 ◽  
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.

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

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.

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

2018 ◽  
Vol 2018.27 (0) ◽  
pp. 2108
Author(s):  
Takashi ISOYAMA ◽  
Takayoshi KAMADA ◽  
Koji SAITO ◽  
Naoki SHIRAKI ◽  
Michiko TANAKA
Keyword(s):  
High Speed ◽  
Ride Comfort ◽  
High Speed Railway
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