Natural Vibration Analysis of High-Speed Railway Slab Tracks under Rail Longitudinal Force

The slab track is the main structure of the high-speed railway track, the Inherent dynamic characteristics of which is of great significance to the research on the Vehicle-Track Coupling Dynamics. The assumptions of the modal function describing the natural vibration of the track is a necessary theoretical basis in analytic and numerical calculations for dynamics problems, which is more in accordance with the real situation, the more likely characteristic estimation are to be accurate. In this paper, with the method of combine matrix, the system characteristic equation of slab-track model is deduced, and the exact analytic formulas of frequency equation and modal function are obtained. Meanwhile the specific effects of the Rail longitudinal force on the vibration performance of the tracks are analyzed through instances. The results show that this approach is an effective analytic method, the solution of which is accurate. And the track parameters can be flexibly initialized, which is especially applicable for the condition of track parameters varying and longitudinal strain with distribution.

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Noise and Vibration Reduction Performance Test of Rubber Damping Pad Under Slab Track in High Speed Railway

2013 Joint Rail Conference ◽

10.1115/jrc2013-2569 ◽

2013 ◽

Author(s):

Rong Chen ◽

Ping Wang ◽

Likang Guo

Keyword(s):

High Speed ◽

Performance Test ◽

Ground Vibration ◽

Railway Track ◽

Engineering Practice ◽

Test Environment ◽

High Speed Railway ◽

Slab Track ◽

Acceleration Sensors ◽

Structure Vibration

Rubber damping pad under ballastless slab track can isolate structure vibration and noise so as to reduce stress and wear of railway track components. In order to make scientific evaluation on the influence of rubber damping pad on the dynamic response of the track structure, focusing on the engineering practice of Chengdu-GuanDujiangyan high-speed railway, comparative test of slab track with and without rubber damping pad is carried out by using acceleration sensors, acoustic sensors, and dynamic data acquisition system. Spectrum analysis of vibration acceleration and noise test results shows that rubber damping pad under track slab can greatly isolate the substructure vibration of the track, the bridge vibration and ground vibration; vibration level of the base slab under the pad is reduced by about 20.1dB; the rubber damping pad can reduce some of the structure noise caused by the bridge structure vibration, but it has no significant effect on noise reduction of the whole system due to the influences of EMU pantograph’s arc noise, severe air turbulence noise and field test environment.

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Deformation Law and Control Limit of CRTSIII Slab Track under Subgrade Frost Heave

Applied Sciences ◽

10.3390/app11083520 ◽

2021 ◽

Vol 11 (8) ◽

pp. 3520

Author(s):

Xiaopei Cai ◽

Qian Zhang ◽

Yanrong Zhang ◽

Qihao Wang ◽

Bicheng Luo ◽

...

Keyword(s):

High Speed ◽

Base Plate ◽

Element Model ◽

Middle Part ◽

Railway Track ◽

Frost Heave ◽

Track Structure ◽

Slab Track ◽

Plastic Damage ◽

Track Irregularity

In order to find out the influence of subgrade frost heave on the deformation of track structure and track irregularity of high-speed railways, a nonlinear damage finite element model for China Railway Track System III (CRTSIII) slab track subgrade was established based on the constitutive theory of concrete plastic damage. The analysis of track structure deformation under different subgrade frost heave conditions was focused on, and amplitude the limit of subgrade frost heave was put forward according to the characteristics of interlayer seams. This work is expected to provide guidance for design and construction. Subgrade frost heave was found to cause cosine-type irregularities of rails and the interlayer seams in the track structure, and the displacement in lower foundation mapping to rail surfaces increased. When frost heave occured in the middle part of the track slab, it caused the greatest amount of track irregularity, resulting in a longer and higher seam. Along with the increase in frost heave amplitude, the length of the seam increased linearly whilst its height increased nonlinearly. When the frost heave amplitude reached 35 mm, cracks appeared along the transverse direction of the upper concrete surface on the base plate due to plastic damage; consequently, the base plate started to bend, which reduced interlayer seams. Based on the critical value of track structures’ interlayer seams under different frost heave conditions, four control limits of subgrade frost heave at different levels of frost heave amplitude/wavelength were obtained.

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A Review of Different Aspects of Applying Asphalt and Bituminous Mixes under a Railway Track

Materials ◽

10.3390/ma14010169 ◽

2020 ◽

Vol 14 (1) ◽

pp. 169

Author(s):

Kazem Jadidi ◽

Morteza Esmaeili ◽

Mehdi Kalantari ◽

Mehdi Khalili ◽

Moses Karakouzian

Keyword(s):

High Speed ◽

Review Paper ◽

Railway Track ◽

High Speed Train ◽

Slab Track ◽

Bituminous Mixtures ◽

Railway Tracks ◽

Potential Applications ◽

Heavy Loads ◽

Design And Construction

Asphalt is a common material that is used extensively for roadways. Furthermore, bituminous mixes have been used in railways, both as asphalt and as mortar. Different agencies and research institutes have investigated and suggested various applications. These studies indicate the benefits of bituminous material under railways, such as improving a substructure’s stiffness and bearing capacity; enhancing its dynamic characteristics and response, especially under high-speed train loads; waterproofing the subgrade; protecting the top layers against fine contamination. These potential applications can improve the overall track structure performance and lead to minimizing settlement under heavy loads. They can also guarantee an appropriate response under high-speed loads, especially in comparison to a rigid slab track. This review paper documents the literature related to the utilization of asphalt and bituminous mixes in railway tracks. This paper presents a critical review of the research in the application of asphalt and bituminous mixes in railway tracks. Additionally, this paper reviews the design and construction recommendations and procedures for asphalt and bituminous mixes in railway tracks as practiced in different countries. This paper also provides case studies of projects where asphalt and bituminous mixes have been utilized in railway tracks. It is anticipated that this review paper will facilitate (1) the exchange of ideas and innovations in the area of the design and construction of railway tracks and (2) the development of unified standards for the design and construction of railway tracks with asphalt and bituminous mixtures.

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Narrowing longitudinally coupled prefabricated slab track maintenance duration with field data analysis of slab deformation under high temperature

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

10.1177/0954409720986266 ◽

2021 ◽

pp. 095440972098626

Author(s):

Zai-Wei Li ◽

Xiao-Zhou Liu ◽

Hong-Yao Lu ◽

Yue-Lei He

Keyword(s):

High Temperature ◽

High Speed ◽

Ride Comfort ◽

Cost Effective ◽

Periodic Variation ◽

Longitudinal Force ◽

Distribution Analysis ◽

High Speed Rail ◽

Track Maintenance ◽

Slab Track

The deformation of longitudinally coupled prefabricated slab track (LCPST) due to high temperature may lead to a reduction in ride comfort and safety in high-speed rail (HSR) operation. It is thus critical to understand and track the development of such defects. This study develops an online monitoring system to analyze LCPST deformation at different slab depths under various temperatures. The trackside system, powered by solar energy with STM8L core that is ultra-low in energy consumption, is used to collect data of LCPST deformation and temperature level uninterruptedly. With canonical correlation analysis, it is found that LCPST deformation presents similar periodic variation to yearly temperature fluctuation and large longitudinal force may be generated as heat accumulates in summer, thereby causing track defects. Then the distribution of temperature and deformation data is categorized based on fuzzy c-means clustering. Through the distribution analysis, it is suggested that slab inspection can be shortened to 6 hours, i.e. from 10:00 am to 4:00 pm, reducing 14.3% track inspection workload from the current practice. The price of workload reduction is only a 2% chance of missed detection of slab deformation. The finding of this research can be used to enhance LCPST monitoring efficiency and reduce interruption to HSR operation, which is an essential step in promoting reliable and cost-effective track service.

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The Effect of Slab Track on Wheel/Rail Rolling Noise in High Speed Railway

Intelligent Automation & Soft Computing ◽

10.1080/10798587.2014.934597 ◽

2014 ◽

Vol 20 (4) ◽

pp. 575-585 ◽

Cited By ~ 5

Author(s):

Xinwen Yang ◽

Guangtian Shi

Keyword(s):

High Speed ◽

High Speed Railway ◽

Slab Track ◽

Rolling Noise

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The Design and Implementation of an Inertial GNSS Odometer Integrated Navigation System Based on a Federated Kalman Filter for High-Speed Railway Track Inspection

Applied Sciences ◽

10.3390/app11115244 ◽

2021 ◽

Vol 11 (11) ◽

pp. 5244

Author(s):

Xinchun Zhang ◽

Ximin Cui ◽

Bo Huang

Keyword(s):

Kalman Filter ◽

Navigation System ◽

High Speed ◽

Measurement Accuracy ◽

Railway Track ◽

Filter Method ◽

Integrated Navigation ◽

High Speed Railway ◽

Track Geometry ◽

Integrated Navigation System

The detection of track geometry parameters is essential for the safety of high-speed railway operation. To improve the accuracy and efficiency of the state detector of track geometry parameters, in this study we propose an inertial GNSS odometer integrated navigation system based on the federated Kalman, and a corresponding inertial track measurement system was also developed. This paper systematically introduces the construction process for the Kalman filter and data smoothing algorithm based on forward filtering and reverse smoothing. The engineering results show that the measurement accuracy of the track geometry parameters was better than 0.2 mm, and the detection speed was about 3 km/h. Thus, compared with the traditional Kalman filter method, the proposed design improved the measurement accuracy and met the requirements for the detection of geometric parameters of high-speed railway tracks.

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