scholarly journals Rail Corrugation of High-Speed Railway Induced by Rail Grinding

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Xing Du ◽  
Xuesong Jin ◽  
Guotang Zhao ◽  
Zefeng Wen ◽  
Wei Li
Keyword(s):  
High Speed ◽  
Field Tests ◽  
Vertical Vibration ◽  
Clear Correlation ◽  
High Speed Rail ◽  
Rail Corrugation ◽  
Rail Grinding ◽  
Initial Excitation ◽  
Technical Operation ◽  
Grinding Stone

Rail corrugation is a common railway defect that involves diverse and complex factors. Rail grinding is also the most commonly used method to address corrugations. Through numerous irregularity tests and one-third octave frequency spectrum analyses, this study determined the characteristics and development process for rail corrugation on high-speed rail tracks. The vibration transmission properties of the grinding train were tested using the force hammer impacting method. Thereafter, using a simulation, the influence of the vertical vibration behavior of the grinding stone and the stiffness of the hydraulics were determined. Through a series of field tests and numerical simulations, this study revealed a clear correlation between rail corrugation and rail grinding and confirmed that the technical operation of rail grinding is closely associated with regular grinding marks at a wavelength of approximately 60 mm on rail surfaces. The combination of the natural vibration of the grinding stone (frequency of 60 Hz) and an inappropriate operational process can aggravate the grinding marks on the rail surfaces, thereby forming an initial excitation of rail corrugation. Although a large number of irregularity tests are performed after rail grinding, these wavelength-fixing grinding marks can cause the formation and development of rail corrugation. Suggestions for improving the high-speed rail-grinding technology are also provided.

scholarly journals Analysis of Rail Corrugation Characteristics on High-Speed Rail Based on Transient Finite Element Method

2021 ◽  
Vol 26 (3) ◽  
pp. 231-239
Author(s):  
Zhiqiang Wang ◽  
Zhenyu Lei
Keyword(s):  
High Speed ◽  
Vertical Vibration ◽  
Dynamic Responses ◽  
High Speed Rail ◽  
Relative Slip ◽  
Tangential Contact ◽  
Rail Corrugation ◽  
Track System ◽  
Characteristic Wavelength ◽  
Unbalanced Load

By using the transient finite element method, a three-dimensional wheelset-track coupled rolling contact model for high-speed rail is established, and the rationality and effectiveness of the model are verified by field measurements. Next, the wheel-rail contact stress states and relative slip characteristics are calculated and analyzed to reveal the cause of inner rail corrugation. Then, the vertical vibration acceleration of the rail/wheel is taken as the output variable to study the dynamic responses of the wheelset-track system. Finally, the parameter sensitivity analysis is carried out. The results show that the maximum normal/tangential contact stress between the inner wheel and inner rail is greater than that between outer wheel and outer rail due to the unbalanced load of inner rail caused by the excess superelevation of track structure, which indicates that the unbalanced load of the inner rail may aggravate the development of rail wear, and the rationality of the model established in this paper is verified. The wheel-rail relative slip region on the inner rail side appears periodically, and the distance between the two adjacent slip regions is close to the characteristic wavelength of the measured inner rail corrugation, which illustrates that the periodic variation of slip regions on the inner rail surface plays an important role in the formation of rail corrugation, and the validity of the model is verified. The periodic distribution of wheel-rail relative slip regions on the outer rail surface is not obvious, demonstrating that the outer rail tends to form uniform wear, which is consistent with the fact that the outer rail corrugation is slight in the measured section. The wheelset-track system has been in the process of unstable continuous oscillation in the analysis interval, combined with the analysis results of the wheel-rail relative slip characteristics, it can be concluded that the unstable self-excited vibration of wheelset-track system under the condition of tangential contact force reaching saturation is the main cause of rail corrugation. The dominant characteristic frequencies of vertical vibration accelerations of rail and wheel are all 561 Hz, the corresponding characteristic wavelength (148 mm) is close to the distance (150 mm) between the calculated adjacent slip regions, and is also close to the characteristic wavelengths (125 mm and 160 mm) of inner rail corrugation, which shows that the resonance phenomenon occurs in the wheelset-track system at the above frequency, thus leading to the increase of dynamic responses of wheelset-track system. The fastener vertical stiffness and wheel-rail coefficient of friction have significant effect on the development of rail corrugation, and the running speed determines the occurrence probability of inner/outer rail corrugation by affecting the track superelevation state.

scholarly journals Dynamic Analysis of a Novel Rail-Grinding Car Using Open-Structured Abrasive Belt for High-Speed Railways

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Wengang Fan ◽  
Guangyou Hou ◽  
Wenxi Wang ◽  
Yuefeng Wu
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
Vertical Vibration ◽  
Vibration Acceleration ◽  
Belt Grinding ◽  
Abrasive Wheel ◽  
Derailment Coefficient ◽  
Rail Grinding ◽  
Working Performance ◽  
Increasing Demand

Nowadays, applying rail grinding has been worldwide recognized as the routine maintenance approach to improving the wheel-rail relationship, as well as extending the rail’s serving life. However, the traditional rail repair technology with the abrasive wheel or the milling cutter is getting harder to meet the increasing demand for high efficiency with high speed. In this paper, according to the engineering requirements and constraints, a new fast rail-grinding car based on open-structured belt grinding technology was designed for the corrugation treatment on high-speed railways. A corresponding simulation model was established and its dynamic working performance was then assessed by SIMPACK software. Results of the four dynamic indices for both straight and curve tracks were within the limits, which had verified the design rationality of the new rail-grinding car. Those dynamic indices are the lateral vibration acceleration, the vertical vibration acceleration, the axle transverse force, and the derailment coefficient.

Study on Re-Radiated Noise in Futian Underground Hub of Guangzhou-Shenzhen-Hongkong High-Speed Rail

2012 ◽  
Vol 209-211 ◽  
pp. 1580-1584 ◽  
Author(s):  
Jie Yao ◽  
Ming Qing Xiao ◽  
Dun Huang
Keyword(s):  
High Speed ◽  
Low Frequency ◽  
Element Model ◽  
Vertical Vibration ◽  
Frequency Noise ◽  
Vibration Level ◽  
Bending Vibration ◽  
High Speed Rail ◽  
Radiated Noise ◽  
Acoustic Measures

A finite element model considering the high-speed train excitation loads, track structure, vibration reduction measures, station construction, characteristics of foundation soils was established to study the problems of vibration and re-radiated noise in the underground Futian hub of Guangzhou-Shenzhen-Hongkong high-speed rail under the excitation of trains. The first 200 natural frequencies of the station are all within 40Hz, the vibration energy concentrates mainly in the second and third floors, in form of bending vibration mode; the modes of orbital plate mainly accounts for vertical vibration, and the lowest frequency is near 26Hz.When the train passes by at a speed of 200km/h, without damping rubber pads, the maximum vibration level is 57.9 dB, while with damping pads the vibration level decreases by 5~6dB. The re-radiated noise level at the surface of the structure is between 38~55.1dB;with damping measures at the orbits, the corresponding acoustic gain in upper floors is 6dB or so; some low-frequency noise excess the standard, but considering the acoustic measures in upper floors, it should be manageable. It is suggested that the train pass by at lower speed, to further reduce the re-radiated noise, to a create amore comfortable environment.

scholarly journals Contact Model And Simulation Analysis of Rail Grinding With Open-Structured Abrasive Belt Based On Pressing Plate

2021 ◽  
Author(s):  
Chang Qian ◽  
Zhiwei Wu ◽  
Guangyou Hou ◽  
Wengang Fan
Keyword(s):  
Theoretical Model ◽  
Contact Stress ◽  
High Speed ◽  
Contact Model ◽  
Concentrated Force ◽  
Rail Corrugation ◽  
Abrasive Belt ◽  
Grinding Method ◽  
Rail Grinding ◽  
Working Length

Abstract Recently, the emerging rail grinding method with open-structured abrasive belt based on pressing plate which adopts full contour copying grinding method to extend the working length of abrasive belt and is more suitable for preventative grinding and maintenance of rail corrugation in high-speed railway has been proposed. The essence of its grinding process is the complex nonlinear interaction among the pressing plate, abrasive belt and rail. The research on the contact mechanism of the rail grinding method with open-structured abrasive belt based on pressing plate is still very lacking, which limits the practical application of the emering rail grinding method to a certain extent. In this paper, a theoretical model of the contact between pressing plate, abrasive belt and rail is established. The contact area morphology and contact stress distribution were obtained, and validity of the theoretical model was verified by finite element simulation. At the same time, the distribution characteristics of contact stress under single concentrated force, uniform force and multiple concentrated force were studied based on the contact model. It is concluded that the multiple concentrated force is the optimal loading method, and the contact stress is more uniform, which is more conducive to repair the standard contour of rail.

Study on Vibration of Futian Underground Hub in Guangzhou-Shenzhen-Hong Kong High-Speed Rail

2012 ◽  
Vol 178-181 ◽  
pp. 1238-1244
Author(s):  
Jie Yao ◽  
Ming Qing Xiao ◽  
Dun Huang ◽  
Guang Hua Yang
Keyword(s):  
Hong Kong ◽  
High Speed ◽  
Element Model ◽  
Vertical Vibration ◽  
Vibration Energy ◽  
Vibration Level ◽  
Bending Vibration ◽  
High Speed Rail ◽  
Structure Vibration ◽  
Station Structure

A finite element model considering the high-speed train excitation loads, track structure, vibration reduction measures, station structure, characteristics of foundation soils was established to study the problem of vibration in the underground Futian hub of Guangzhou-Shenzhen- Hong Kong high-speed rail. The first 200 natural frequencies of the station are all within 40Hz, the vibration energy concentrates mainly in the second and third floors, in the form of bending vibration mode; the modes of local orbital plate mainly accounts for vertical vibration, and the lowest frequency is near 26Hz.The additional displacement and stress induced by vibration is not great in general, vibration energy of the structure is mainly concentrated in the band of 15~20Hz. When the train passes by at a speed of 200km/h, without damping rubber pads, the maximum vibration level at upper floors is 57.9 dB, while with damping pads under the orbits the vibration level decreases by 5~6dB,which is a significant effect.

Research on Prediction of High-Speed Rail Trains Delay Time

CICTP 2020 ◽  
2020 ◽  
Author(s):  
Jing Shi ◽  
Qiyuan Peng ◽  
Ling Liu
Keyword(s):  
Delay Time ◽  
High Speed ◽  
High Speed Rail

THE HIGH-SPEED RAIL HANDBOOK: A TECHNICAL GUIDE1

2018 ◽  
Vol 8 (3) ◽  
pp. 515-530
Author(s):  
Massimo Zucchetti1,2 ◽  
◽  
Keyword(s):  
High Speed ◽  
High Speed Rail

Case study: Prediction and field tests of railway noise and effects of a low-height noise barrier

2020 ◽  
Vol 68 (4) ◽  
pp. 303-314
Author(s):  
Yuna Park ◽  
Hyo-In Koh ◽  
University of Science and Technology, Transpo ◽  
University of Science and Technology, Transpo ◽  
University of Science and Technology, Transpo ◽  
...  
Keyword(s):  
High Speed ◽  
Field Tests ◽  
Residential Areas ◽  
Railway Systems ◽  
Railway Noise ◽  
Sound Levels ◽  
Noise Barrier ◽  
The Difference ◽  
Reduction Effect ◽  
The Impact

Railway noise is calculated to predict the impact of new or reconstructed railway tracks on nearby residential areas. The results are used to prepare adequate counter- measures, and the calculation results are directly related to the cost of the action plans. The calculated values were used to produce noise maps for each area of inter- est. The Schall 03 2012 is one of the most frequently used methods for the production of noise maps. The latest version was released in 2012 and uses various input para- meters associated with the latest rail vehicles and track systems in Germany. This version has not been sufficiently used in South Korea, and there is a lack of standard guidelines and a precise manual for Korean railway systems. Thus, it is not clear what input parameters will match specific local cases. This study investigates the modeling procedure for Korean railway systems and the differences between calcu- lated railway sound levels and measured values obtained using the Schall 03 2012 model. Depending on the location of sound receivers, the difference between the cal- culated and measured values was within approximately 4 dB for various train types. In the case of high-speed trains, the value was approximately 7 dB. A noise-reducing measure was also modeled. The noise reduction effect of a low-height noise barrier system was predicted and evaluated for operating railway sites within the frame- work of a national research project in Korea. The comparison of calculated and measured values showed differences within 2.5 dB.

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