Journal articles on the topic 'High speed trains Dynamics'
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1
Diedrichs, B., M. Berg, S. Stichel, and S. Krajnović. "Vehicle dynamics of a high-speed passenger car due to aerodynamics inside tunnels." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 221, no. 4 (July 1, 2007): 527–45. http://dx.doi.org/10.1243/09544097jrrt125.
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High train speeds inside narrow double-track tunnels using light car bodies can reduce the ride comfort of trains as a consequence of the unsteadiness of the aerodynamics. This fact was substantiated in Japan with the introduction of the series 300 Shinkansen trains more than a decade ago, where the train speed is very high also in relatively narrow tunnels on the Sanyo line. The current work considers the resulting effects of vehicle dynamics and ride comfort with multi-body dynamics using a model of the end car of the German high-speed train ICE 2. The present efforts are different from traditional vehicle dynamic studies, where disturbances are introduced through the track only. Here disturbances are also applied to the car body, which conventional suspension systems are not designed to cope with. Vehicle dynamic implications of unsteady aerodynamic loads from a previous study are examined. These loads were obtained with large eddy simulations based on the geometry of the ICE 2 and Shinkansen 300 trains. A sensitivity study of some relevant vehicle parameters is carried out with frequency response analysis (FRA) and time domain simulations. A comparison of these two approaches shows that results which are obtained with the much swifter FRA technique are accurate also for sizable unsteady aerodynamic loads. FRA is, therefore, shown to be a useful tool to predict ride comfort in the current context. The car body mass is found to be a key parameter for car body vibrations, where loads are applied directly to the car body. For the current vehicle model, a mass reduction of the car body is predicted to be most momentous in the vicinity of 2 Hz.
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Lin, H.-T., and S.-H. Ju. "Three-dimensional analyses of two high-speed trains crossing on a bridge." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 217, no. 2 (March 1, 2003): 99–110. http://dx.doi.org/10.1243/095440903765762841.
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This paper investigates the dynamic characteristics of the three-dimensional vehicle-bridge system when two high-speed trains are crossing on a bridge. Multispan bridges with slender piers and simply supported beams were used in the dynamic finite element analysis. A response ratio (RR) was defined in this study to represent the ratio of the vehicle-bridge interaction of two-way trains to that of a one-way train. The finite element results indicate that this ratio increases significantly when two-way trains run near the same speed, and the maximum value is approximately equal to or smaller than two for the vertical dynamic response. This means that the maximum dynamic response of the two-way trains is at most twice that of the one-way train. When the two-way train speeds are sufficiently different, the response ratio approaches one on average, which means that the dynamic effect of the two-way train is similar to that of the one-way train. Finite element results also indicate that the averaged response ratio in the three global directions is about 1.65 when the two-way trains run at the same speed.
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Li, Wei, Xuecheng Bian, Xiang Duan, and Erol Tutumluer. "Full-Scale Model Testing on Ballasted High-Speed Railway: Dynamic Responses and Accumulated Settlements." Transportation Research Record: Journal of the Transportation Research Board 2672, no. 10 (July 13, 2018): 125–35. http://dx.doi.org/10.1177/0361198118784379.
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High-speed trains generate much higher vibrations in track structures than conventional trains and intensive train passages (e.g., on the Beijing–Shanghai high-speed railway line where the train passage interval is less than 5 minutes) cause accumulated permanent settlement in the railway track substructures, which will decrease track performance and jeopardize the safety of trains. Since very few field measurements on ballasted high-speed railways are available in literature, this paper presents experimental results of vibration velocity, dynamic soil stress, and the accumulated settlement of a ballasted high-speed railway from a full-scale model testing facility with simulated trains moving loads at various speeds. A portion of a realistic ballasted railway consisting of track structure, ballast layer, subballast, embankment, and piled foundation was constructed in a larger box. An eight-actuator sequential loading system was used to generate equivalent vertical loadings on the track structure for simulating the dynamic excitations due to train movements. Dynamic stresses measured in the track substructure layers (ballast, subballast, and embankment) were found to be strongly dependent on train speeds especially for speeds higher than 144 km/h. It was found that both the vibration velocity and the dynamic soil stress were greatly amplified as the train speed increased to 300 km/h, and the ballast layer effectively reduced the vibrations transmitted from the track structure to underlying soil. The accumulated settlement of the substructure did not reach a stable state even after 100,000 moving train loads at a speed of 300 km/h.
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Shkurnikov, Sergey, and Olga Morozova. "On interaction of a rolling stock and geometrical parametres of high-speed networks’ route." Bulletin of scientific research results, no. 3 (October 17, 2017): 96–104. http://dx.doi.org/10.20295/2223-9987-2017-3-96-104.
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Objective: Due to the lack of global experience of holding on one track high-speed passenger trains (moving at a speed up to 400 km/h), high-speed passenger trains (moving at a speed up to 250 km/h) and special freight trains (accelerating to a speed of more than 200 km/h), the only possible way of studying the influence of a train on a track is computer simulation modeling. The analysis of the existing computer programs was carried out and the most effective programme for the solution of combined train movement was selected. Methods: Simulation modeling was applied. On the basis of the obtained model the possibility of “Universal mechanism” software practical application was considered. Results: A test simulation model of a high-speed train carriage was developed in “Universal mechanism” software application. Preliminary results showed the possibility of its usage for the study of a high-speed train and track interaction. Practical importance: Modern computer technologies make it possible to solve the tasks of dynamic interaction with a high degree of accuracy. Among the variety of software used for the study of dynamic behavior of a railway vehicle in Russia, “Universal mechanism” software application is of wide popularity and may be used for the study of dynamic behavior of different types of trains on railway tracks of different plans and profiles.
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Alexander, Nicholas A., and Mohammad M. Kashani. "Exploring Bridge Dynamics for Ultra-high-speed, Hyperloop, Trains." Structures 14 (June 2018): 69–74. http://dx.doi.org/10.1016/j.istruc.2018.02.006.
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Lai, S. K., C. Wang, L. H. Zhang, and Y. Q. Ni. "Realizing a Self-powered Real-time Monitoring System on High-speed Trains." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (August 1, 2021): 434–41. http://dx.doi.org/10.3397/in-2021-1476.
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The development of the worldwide high-speed rail network is expanding at a rapid pace, imposing great challenges on the operation safety. Recent advances in wireless communications and information technology can integrate the Internet of Things and cloud computing to form a real-time monitoring platform of high-speed trains. To realize this system, a sustainable power source is indispensable. In this case, an ideal solution is to deploy a vibration-based energy harvester instead of batteries for the electrical supply of wireless sensors/devices, as vibrations induced by rail/wheel contact forces and vehicle dynamics are an abundant energy source. To address this challenge, a multi-stable, broadband and tri-hybrid energy harvesting technique was recently proposed, which can work well under low-frequency, low-amplitude, and time-varying ambient sources. In this work, we will introduce our idea, following the recently proposed energy harvester and the dynamic responses of a train vehicle, to design a self-sustained sensing system on trains. Supported by this self-powered system, accelerometers and microphones deployed on an in-service train (in axle boxes/bogie frames) can measure vibration and noise data directly. The correlation of the vibration and noise data can then be analyzed simultaneously to identify the dynamic behavior (e.g., wheel defects) of a moving train.
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Kaloop, Mosbeh R., Jong Wan Hu, and Mohamed A. Sayed. "Yonjung High-Speed Railway Bridge Assessment Using Output-Only Structural Health Monitoring Measurements under Train Speed Changing." Journal of Sensors 2016 (2016): 1–15. http://dx.doi.org/10.1155/2016/4869638.
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Yonjung Bridge is a hybrid multispan bridge that is designed to transport high-speed trains (HEMU-430X) with maximum operating speed of 430 km/h. The bridge consists of simply supported prestressed concrete (PSC) and composite steel girders to carry double railway tracks. The structural health monitoring system (SHM) is designed and installed to investigate and assess the performance of the bridge in terms of acceleration and deformation measurements under different speeds of the passing train. The SHM measurements are investigated in both time and frequency domains; in addition, several identification models are examined to assess the performance of the bridge. The drawn conclusions show that the maximum deflection and acceleration of the bridge are within the design limits that are specified by the Korean and European codes. The parameters evaluation of the model identification depicts the quasistatic and dynamic deformations of PSC and steel girders to be different and less correlated when higher speeds of the passing trains are considered. Finally, the variation of the frequency content of the dynamic deformations of the girders is negligible when high speeds are considered.
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Soper, David, Dominic Flynn, Chris Baker, Adam Jackson, and Hassan Hemida. "A comparative study of methods to simulate aerodynamic flow beneath a high-speed train." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 232, no. 5 (October 5, 2017): 1464–82. http://dx.doi.org/10.1177/0954409717734090.
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The introduction of dedicated high-speed railway lines around the world has led to issues associated with running trains at very high speeds. Aerodynamic effects proportionally increase with train speed squared; consequently, at higher speeds aerodynamic effects will be significantly greater than those of trains travelling at lower speeds. On ballasted track beds, the phenomenon in which ballast particles become airborne during the passage of a high-speed train has led to the need for understanding the processes involved in train and track interaction (both aerodynamical and geotechnical). The difficulty in making full-scale aerodynamic measurements beneath a high-speed train has created the requirement to be able to accurately simulate these complex aerodynamic flows at the model scale. In this study, the results of moving-model tests and numerical simulations were analysed to determine the performance of each method for simulating the aerodynamic flow underneath a high-speed train. Validation was provided for both cases by juxtaposing the results against those from full-scale measurements. The moving-model tests and numerical simulations were performed at the 1/25th scale. Horizontal velocities from the moving-model tests and computational fluid dynamics simulations were mostly comparable except those obtained close to the ballast. In this region, multi-hole aerodynamic probes were unable to accurately measure velocities. The numerical simulations were able to resolve the flow to much smaller turbulent scales than could be measured in the experiments and showed an overshoot in peak velocity magnitudes. Pressure and velocity magnitudes were found to be greater in the numerical simulations than in the experimental tests. This is thought to be due to the influence of ballast stones in the experimental studies allowing the flow to diffuse through them, whereas in the computational fluid dynamics simulations, the flow stagnated on a smooth non-porous surface. Additional validation of standard deviations and turbulence intensities found good agreement between the experimental data but an overshoot in the numerical simulations. Both moving model and computational fluid dynamics techniques were shown to be able to replicate the flow development beneath a high-speed train. These techniques could therefore be used as a method to model underbody flow with a view to train homologation.
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Feng, Chenjiang, and Wenzhen Kuang. "High-speed train speed tracking control based on active disturbance rejection control strategy." Journal of Physics: Conference Series 2246, no. 1 (April 1, 2022): 012043. http://dx.doi.org/10.1088/1742-6596/2246/1/012043.
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Abstract The speed tracking control of high-speed trains has the characteristics of nonlinearity, time delay, and multi-factor interference. Aiming at this, a train speed tracking algorithm based on active disturbance rejection control strategy is proposed. First, establish a train control model based on the train dynamics model. Secondly, design a second-order active disturbance rejection controller to set and compensate for unknown disturbances, and then convert the known train parameters to the controlled object for system simulation, the target speed curve is tracked, which proves the feasibility of the auto disturbance rejection control algorithm. Finally, compare traditional PD control algorithms in terms of anti-jamming performance and tracking error. The results show that the high-speed train speed controller based on active disturbance rejection control has greatly improved the tracking speed accuracy and the robustness of the control system.
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Yang, Yingze, Zheng Xu, Weirong Liu, Heng Li, Rui Zhang, and Zhiwu Huang. "Optimal Operation of High-Speed Trains Using Hybrid Model Predictive Control." Journal of Advanced Transportation 2018 (2018): 1–16. http://dx.doi.org/10.1155/2018/7308058.
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The high-speed train operation process is highly nonlinear and has multiple constraints and objectives, which lead to a requirement for the automatic train operation (ATO) system. In this paper, a hybrid model predictive control (MPC) framework is proposed for the controller design of the ATO system. Firstly, a piecewise linear system with state and input constraints is constructed through piecewise linearization of the high-speed train’s nonlinear dynamics. Secondly, the piecewise linear system is transformed into a mixed logical dynamical (MLD) system by introducing the auxiliary binary variables. For the transformed MLD system, a hybrid MPC controller is designed to realize the precise control under hard constraints. To reduce the online computation complexity, the explicit control law is computed offline by employing the mixed-integer linear programming (MILP) technique. Simulation results validate the effectiveness of the proposed method.
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Liu, Jing, and Shangkun Du. "Dynamic Analysis of a High-Speed Railway Train With the Defective Axle Bearing." International Journal of Acoustics and Vibration 25, no. 4 (December 30, 2020): 525–31. http://dx.doi.org/10.20855/ijav.2020.25.41701.
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Axle bearings (AXBs) are critical parts for high-speed railway trains (HSTs). Local faults in the AXBs have great influences on the operational dynamics of HSTs. Although some previous works formulated the local faults in single AXB, the vibrations of the whole train system with the defective AXB cannot be described. To overcome this problem, this study conducts a dynamic model for a HST considering a local fault in one AXB. The previous single AXB model cannot formulate the studied case. The impacts caused by the fault in the AXB is defined as a time-dependent force model considering a half-sine type. The road spectrum excitations from the roadbed and rail are formulated by a track irregularities model. The effects of the train speeds and fault sizes on the HST dynamics are introduced. The simulation results from the proposed and previous works are contrasted to show the model validation. The results show that the faults in the AXB will greatly affect the HST dynamics. It depicts that this study can afford a more reasonable approach for understanding the dynamics of HSTs considering the defective AXBs compared to the reported single AXB model.
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Zhang, Weihua, Zhiyun Shen, and Jing Zeng. "Study on dynamics of coupled systems in high-speed trains." Vehicle System Dynamics 51, no. 7 (July 2013): 966–1016. http://dx.doi.org/10.1080/00423114.2013.798421.
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Zhang, Ming Lu, Yi Ren Yang, Li Lu, and Chen Guang Fan. "Numerical Simulation of Flowfield around High Speed Trains Passing by each other at the same Speed." Applied Mechanics and Materials 97-98 (September 2011): 698–701. http://dx.doi.org/10.4028/www.scientific.net/amm.97-98.698.
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Large eddy simulation (LES) was made to solve the flow around two simplified CRH2 high speed trains passing by each other at the same speed base on the finite volume method and dynamic layering mesh method and three dimensional incompressible Navier-Stokes equations. Wind tunnel experimental method of resting train with relative flowing air and dynamic mesh method of moving train were compared. The results of numerical simulation show that the flow field structure around train is completely different between wind tunnel experiment and factual running. Two opposite moving couple of point source and point sink constitute the whole flow field structure during the high speed trains passing by each other. All of streamlines originate from point source (nose) and finish with the closer point sink (tail). The flow field structure around train is similar with different vehicle speed.
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Yan Q SUN, Colin COLE, Maksym SPIRYAGIN, and Manicka DHANASEKAR. "Vertical Dynamic Interaction of Trains and Rail Steel Bridges." Electronic Journal of Structural Engineering 13, no. 1 (January 1, 2013): 88–97. http://dx.doi.org/10.56748/ejse.131641.
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Rail steel bridges are vulnerable to high impact forces due to the passage of trains; unfortunately the determination of these transient impact forces is not straightforward as these are affected by a large number of parameters, including the wagon design, the wheel-rail contact and the design parameters of the bridge deck and track, as well as the operational parameters – wheel load and speed. To determine these impact forces, a detailed rail train-track/bridge dynamic interaction model has been developed, which includes a comprehensive train model using multi-body dynamics approach and a flexible track/bridge model using Euler-Bernoulli beam theory. Single and multi-span bridges have been modelled to examine their dynamic characteristics. From the single span bridge, the train critical speed is determined; the minimum distance of two peak loadings is found to affect the train critical speed. The impact factor and the dynamic characteristics are discussed.
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Wang, Xu, Yuanhao Qian, Zengshun Chen, Xiao Zhou, Huaqiang Li, and Hailin Huang. "Numerical studies on aerodynamics of high-speed railway train subjected to strong crosswind." Advances in Mechanical Engineering 11, no. 11 (November 2019): 168781401988727. http://dx.doi.org/10.1177/1687814019887270.
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Under the action of strong crosswind, the aerodynamic behavior of a rail vehicle at high speed will be changed significantly, which could directly affect the safe operation of the vehicle. With the help of the shape of train used in China, the aerodynamic characteristics of trains with scale of 1:1 is investigated using computational fluid dynamics numerical simulation method, which consists of the variation of aerodynamics force and moment with wind yaw angle, wind speed, train speed, and nose shape. After an initial validation against Baker’s results from wind tunnel test, the numerical model is then used to investigate the aerodynamic characteristics of the trains. The numerical results indicate that lift coefficient of the M train is slightly higher than TMC1 and TMC2 trains. Regardless of aerodynamics force coefficients, TMC1 reaches the maximum at a yaw angle of 75°. Aerodynamics force coefficient increases with both wind speed and train speed, but the change of which is not linear. Comparing aerodynamic force with different geometric dimensions of train nose, it is shown that height–width ratio is insensitive to side force and rolling moment, but sensitive to lift force from the yaw angle 0°–90°. The side force coefficient, as we most concern, is less than other results, when the length–width ratio is 1 and height–width is 0.87.
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Wang, Judith, and Xiangwu Zeng. "Numerical Simulations of Vibration Attenuation of High-Speed Train Foundations With Varied Trackbed Underlayment Materials." Journal of Vibration and Control 10, no. 8 (August 2004): 1123–36. http://dx.doi.org/10.1177/1077546304043268.
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Interest in high-speed railway as an alternative means of transportation is steadily increasing around the world. However, high-speed trains come with the concern of track vibration and induced noise and ground vibration. Excessive track vibration can cause damage to trains and tracks and reduce riding comfort for passengers. Ground vibration induced by passing trains can also damage and disturb surrounding infrastructure (especially structures housing precision machines or instruments) and residents. One potential solution toward minimizing these vibrations is the use of rubber-modified asphalt concrete (RMAC) as a material for high-speed train trackbed underlayments. In this paper we present the results of a finite element simulation of a high-speed train foundation. The simulated foundation was subjected to dynamic loading in several test scenarios, with RMAC and other traditional paving materials used as trackbed underlayment materials. The ground accelerations at designated points in these simulations were then monitored and compared with one another to determine the relative effectiveness in vibration attenuation. From these parametric studies, RMAC proves to be more effective than currently used paving materials in damping out vibrations from dynamic loading. Implications for field applications are also discussed.
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Huang, Qihuan, Yian Wang, Guido Luzi, Michele Crosetto, Oriol Monserrat, Jianfeng Jiang, Hanwei Zhao, and Youliang Ding. "Ground-Based Radar Interferometry for Monitoring the Dynamic Performance of a Multitrack Steel Truss High-Speed Railway Bridge." Remote Sensing 12, no. 16 (August 12, 2020): 2594. http://dx.doi.org/10.3390/rs12162594.
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With the continuous expansion of the high-speed railway network in China, long-span railway bridges carrying multiple tracks demand reliable and fast testing procedures and techniques. Bridge dynamic behavior analysis is a critical process in ensuring safe operation of structures. In this study, we present some experimental results of the vibration monitoring of a four-track high-speed railway bridge with a metro–track on each side: the Nanjing–Dashengguan high-speed railway bridge (NDHRB). The results were obtained using a terrestrial microwave radar interferometer named IBIS-S. The radar measurements were interpreted with the support of lidar point clouds. The results of the bridge dynamic response under different loading conditions, including high-speed trains, metro and wind were compared with the existing bridge structure health monitoring (SHM) system, underlining the high spatial (0.5 m) and temporal resolutions (50 Hz–200 Hz) of this technique for railway bridge dynamic monitoring. The detailed results can help engineers capturing the maximum train-induced bridge displacement. The bridge was also monitored by the radar from a lateral position with respect to the bridge longitudinal direction. This allowed us to have a more exhaustive description of the bridge dynamic behavior. The different effects induced by the passage of trains through different tracks and directions were distinguished. In addition, the space deformation map of the wide bridge deck under the eccentric load of trains, especially along the lateral direction (30 m), can help evaluating the running stability of high-speed trains.
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Liu, Yong, and Ning Ping Cao. "The Analysis of Flow Characteristics for the High-Speed Train with Strong Crosswind Using CFD." Applied Mechanics and Materials 66-68 (July 2011): 850–54. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.850.
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High-speed trains are easily got overturned in strong crosswind. This paper aims to analyze the fluid field of high-speed train under different distortion angles by using computational fluid dynamics (CFD), hybrid grid method and finite volume method. The results shows that the vortexes roll by the separated airflow are alternating occur and develop along the body from the top and bottom. It causes a strong affect to the lateral stability of the train.
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Domin, Rostyslav, Iurii Domin, and Ganna Cherniak. "Estimation of dynamic performances of the safe operation of high-speed electric train." Archives of Transport 41, no. 1 (March 13, 2017): 7–16. http://dx.doi.org/10.5604/01.3001.0009.7374.
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The process of implementation of new developments, in particular, new generation rolling stock holds a prominent place among the range of measures for organization of high-speed passenger rail transportation in Ukraine. The example of permission for use and the initial phase of work with interregional NRCS2 dual-mode electric trains produced by Hyundai-Rotem Corporation is the illustrative one in this context. Due to the detection of macro-cracks in bolster beams of the car body frames of these electric trains, namely in the areas of mounting of anti-yaw dampers, these trains were taken out of service until the completion of the modernization of problematic nodes. The comprehensive study on the determination of the safety parameters of electric trains was conducted to determine the causes of destruction of bolster beams. At the same time, bolster beams loading was estimated depending on the characteristics of anti-yaw dampers by means of computer simulation of the dynamics of motion of trailing and motor cars. The feasibility of selection of parameters for anti-yaw dampers mounted on electric train cars was assessed. The results of work will improve the safe operation of high-speed trains and increase the efficiency of estimates regarding the loading of bearing structures of underframes of the of rolling stock.
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Huang, Bin, and Ying Huang. "Multimode Intelligent Control Based on Multidata Fusion Filtering in High-Speed Train Traffic Signal and Control." Journal of Sensors 2021 (May 31, 2021): 1–10. http://dx.doi.org/10.1155/2021/6081999.
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As the speed of high-speed trains continues to increase, the intelligent monitoring of high-speed trains has become a concern of people. This research mainly discusses the application of multimode intelligent control of multidata fusion filtering in high-speed train traffic signal and control. In multimodal intelligent control, BangBang, PI control, adaptive fuzzy PID control, and expert monitoring control under special circumstances can be used, respectively, according to the error and the rate of change of the error, which can achieve the best control effect under safe conditions. Take the allowable speed of ATP as the target speed of the control system, and combine the operation process, operation requirements, traction characteristics, braking characteristics of high-speed trains, and meet the two conditions for improving the operating efficiency of high-speed trains. According to the dynamic expected speed value of high-speed trains, dynamically adjust the switching threshold. This study uses a pulse signal generator to simulate the speed data of the vehicle speed sensor (all pulse data), and then read the speed (pulse) signal data through the pulse signal acquisition card, and display the simulated speed data under the Kingview software. The monitoring computer is used to collect train speed information, display speed information, manage speed information, and output speed information. Then, through OPC technology, the simulation speed data is transmitted to MATLAB software for multidata fusion filtering processing and multimodal control simulation. In the simulation process, the train adopts a multimodal intelligent control response scheme, with a total time of 2183.7 s, which is shortened by 214.5 s and improved by nearly 10%. The multimode intelligent control scheme of multidata fusion filtering proposed in this study can better meet the control of high-speed train traffic signals.
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Feng, Zhi Peng, Ji Ye Zhang, and Wei Hua Zhang. "The Vehicle Dynamical Analysis of a High-Speed Train Passing through a Tunnel." Applied Mechanics and Materials 29-32 (August 2010): 835–40. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.835.
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As the speed of train increases, flow-induced vibration of trains passing through tunnels has become a subject of discussion, to investigate this phenomenon, a simplified geometric model and a vehicle dynamics model of a high-speed train traveling through a tunnel were built. To analyze the unsteady three-dimensional flow around the train, the 3-D, transient, viscous, compressible Reynolds-averaged Navier-Stokes equations combined with the k- two-equation turbulence model were solved with the finite volume method. The motion of the train was carried out using the technique of sliding grid method. The dynamics response of the train was obtained by means of the computational multi-body dynamics calculation. Meanwhile the running safety and riding comfort of the train were analyzed. With the numerical simulation, the variation of aerodynamic forces was obtained. The research founds that, vibration of the train increases drastically during it passing through a tunnel. The running safety and riding quality of the train are reduced greatly but they are in the safe range.
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Diachenko, Leonid, and Andrey Benin. "Justification of the bridge span vertical stiffness on high-speed railways." E3S Web of Conferences 135 (2019): 03065. http://dx.doi.org/10.1051/e3sconf/201913503065.
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When designing bridges on high-speed railways, special attention should be paid to ensuring the safety of train traffic and the comfort of passengers. Excessive structure deformations (both elastic and non-elastic) result in unfavorable irregularities in the train movement pattern on the bridge and so can lead to violation of the traffic safety requirements as well as to vibration and acceleration of the train body, which is inadmissible due to its effect on the human body or the transported goods. In this paper, based on numerical simulation, the results of the study of the motion of a high-speed train along bridge structures of the dynamic bridgetrain interaction was performed with respect to various models of high-speed trains running along the bridges. The obtained dependences help to provide a practical assessment of high-speed passenger car dynamics and passenger comfort under the most unfavorable conditions, when the train is running along a multi-span bridge. For these purposes, the dependences of the admissible value of the relative vertical deflection are presented, based on the envelope curves that show the typical dynamic passenger car parameters (natural frequency of car oscillations) and Corresponding with their oscillations on the multi-span girder bridges with various lengths
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Krylov, Victor V. "Vibrational impact of high‐speed trains. I. Effect of track dynamics." Journal of the Acoustical Society of America 100, no. 5 (November 1996): 3121–34. http://dx.doi.org/10.1121/1.417123.
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Zhang, Yue, and Dongping Wang. "Numerical Analysis of the Aerodynamic Characteristics of the Open Line Intersection of Fast Freight Train with the Speed of 160 km/h." Journal of Physics: Conference Series 2125, no. 1 (November 1, 2021): 012014. http://dx.doi.org/10.1088/1742-6596/2125/1/012014.
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Abstract With the increase of the speed of fast freight train, the aerodynamic effect of freight train in open-line intersection is more obvious. However, at present, there are many domestic researches on the aerodynamic characteristics of high-speed train open-line intersection, and almost no researches on fast freight train. Therefore, it is of great significance to study the aerodynamic characteristics of open line intersection of fast freight train in order to improve the safe operation of freight train in China. Based on the theory of computational fluid dynamics and finite volume method, uses FLUENT software to numerically calculate the three-dimensional, unsteady, compressible and turbulent flow fields in open line intersection of fast freight train at different speeds. The calculations results indicate that: when two freight trains meet, the amplitude of the pressure wave at the intersection side is the largest and the closer to the train bottom, the greater the amplitude of the pressure wave. The pressure amplitude of the bottom measuring point is 34.09% higher than that of the top measuring point. When two cars intersect at the same speed, the higher the speed, the greater the pressure amplitude and the pressure amplitude is proportional to the square of the speed. The fitting formula is: ΔP = cV2 ; When two trains intersect at different speeds, the impact on freight train with lower speed is greater than higher one.
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Yang, Jiaqiang, Yulong Zhu, and Pengyong Miao. "Effect Evaluation of Train Speed and Embankment Stiffness on Ground Vibrations Using Numerical Simulation." Applied Sciences 12, no. 24 (December 7, 2022): 12536. http://dx.doi.org/10.3390/app122412536.
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This paper presents a transient-dynamic method (TDM), to investigate the dynamic responses of a railway formation under a train moving load using a three-dimensional finite element model. First, the feasibility of the TDM was verified, by comparing the vertical stress in a railway formation calculated using this method with the steady-state method (SSM). Next, the effects of train speed and embankment stiffness on the dynamic response of the railway formation were evaluated using TDM. The numerical results indicated that the vertical displacement/stress of the railway formation were remarkably increased with an increased train speed, within the shear wave velocity of the soft soil. In contrast, the vertical displacement/stress attenuation with the depth of the ground caused by high-speed trains was faster than that caused by low-speed trains. As for the effect of embankment stiffness, the enhancement of embankment stiffness had little effect on the transfer of vertical stress to the underlying soil. Finally, a determination of the dynamic stress for different train speeds was evaluated. This design code may underestimate the dynamic stress in a railway formation in high-speed situations (e.g., v = 112 m/s).
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Shi, Zhou, Jun Li Guo, Wei Feng Su, and Shuang Yang Zhang. "Analysis of Dynamic Wind of Sound Barrier under High Speed Train." Applied Mechanics and Materials 361-363 (August 2013): 1536–42. http://dx.doi.org/10.4028/www.scientific.net/amm.361-363.1536.
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The special dynamic pulsating air pressure acting on the surface of sound barrier can be aroused by passing high speed train, making sound barrier structure and components prone to destruction and other issues. Based 3-D unsteady k-ε two-equation turbulent model, dynamic processes of high-speed trains passing the sound barrier region at different speeds and many factors are simulated and analyzed by using moving mesh finite volume method. The results of dynamic numerical calculated pulsating air pressure results and the effecting rule of various parameters were obtained, and compared with the measured data. It is showed that the air pressure value increases with the increasing train speed and the dynamic numerical calculated pulsating air pressure curves shape and effecting rule of parameters are all well matched with the measured data, but the air pressure value is slightly larger. At last, based on the results of numerical calculation, the addition of static air pressure value caused by high speed train is put forward.
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Xu, Kun, Jing Zeng, and Cai-Hong Huang. "Nonlinear stability analysis of motor bogies for high-speed trains." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 233, no. 9 (December 10, 2018): 885–95. http://dx.doi.org/10.1177/0954409718814972.
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The traction motor flexibly suspended on the bogie frame is conducive to the lateral dynamic performance of high-speed trains. At present, most of the researches about the influences of suspension parameters of the traction motor on the stability of the bogie are limited to the linear system. In this paper, according to the suspension mode of the traction motor of a certain type of high-speed train in China, the dynamic equations of the motorized bogie with eight degrees of freedom are derived, and the nonlinear stability of the bogie system is analyzed. The bifurcation diagrams of the bogie system with different motor suspension parameters are obtained by using the continuation algorithm, and the linear and nonlinear critical speeds of the system are studied. The study shows that the suspension stiffness, damping coefficient, and the mass of the motor significantly affect the critical speeds of the bogie system. Then the mechanisms of the influence of suspension parameters on the linear and nonlinear critical speeds of the bogie are analyzed by the root locus method and Hopf bifurcation normal form theory, respectively.
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Tang, Yiqun, Qi Yang, Xingwei Ren, and Siqi Xiao. "Dynamic response of soft soils in high-speed rail foundation: in situ measurements and time domain finite element method model." Canadian Geotechnical Journal 56, no. 12 (December 2019): 1832–48. http://dx.doi.org/10.1139/cgj-2018-0555.
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The dynamic response of soil to vibrations induced by moving trains has been widely studied using in situ measurements. However, few in situ tests have been conducted to measure the resulting vibration of foundation soils, especially for the foundation of high-speed rail (HSR) in a soft area. In this study, a number of field experiments were conducted on Shanghai–Hangzhou HSR in a suburb of Shanghai, China. The testing instruments were installed in foundation soils just beneath the HSR track to measure the vibration induced by trains moving at different speeds. Test results show the frequencies of foundation soil vibration are characterized by the train speed and geometrical features of the trains and slab track. In the frequency domain, the dominant frequency bands for vertical acceleration, velocity, and displacement of foundation soil decrease successively. In the time domain, the magnitudes of vibration levels at different locations in a soil foundation decrease gradually with increasing distance from the track. Furthermore, higher train speed can result in higher vibration level. Based on the field conditions, a three-dimensional dynamic finite–infinite element model is developed in the time domain. It shows the model is capable of capturing the primary characteristics of train-induced vibration in the field.
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Li, Yongle, Jiangtao Deng, Bin Wang, and Chuanjin Yu. "Running Safety of Trains under Vessel-Bridge Collision." Shock and Vibration 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/252574.
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To optimize the sensor placement of the health monitoring system, the dynamic behavior of the train-bridge system subjected to vessel-collision should be studied in detail firstly. This study thus focuses on the characteristics of a train-bridge system under vessel-bridge collision. The process of the vessel-bridge collision is simulated numerically with a reliable finite element model (FEM). The dynamic responses of a single car and a train crossing a cable-stayed bridge are calculated. It is shown that the collision causes significant increase of the train’s lateral acceleration, lateral wheelset force, wheel unloading rate, and derailment coefficient. The effect of the collision on the train’s vertical acceleration is much smaller. In addition, parametric studies with various train’s positions, ship tonnage, and train speed are performed. If the train is closer to the vessel-bridge collision position or the ship tonnage is larger, the train will be more dangerous. There is a relatively high probability of running danger at a low speed, resulting from longer stay of the train on the bridge. The train’s position, the ship tonnage, and the train speed must be considered when determining the most adverse conditions for the trains running on bridges under vessel-bridge collision.
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Zhang, Ming Lu, Yi Ren Yang, Li Lu, and Chen Guang Fan. "Numerical Simulation of Two High Speed Trains Passing by each other in a Long Tunnel." Applied Mechanics and Materials 117-119 (October 2011): 670–73. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.670.
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Large eddy simulation (LES) was made to solve the flow around two simplified CRH2 high speed trains passing by each other at the same speed in a long tunnel base on the finite volume method and dynamic layering mesh method and three dimensional incompressible Navier-Stokes equations. Wind tunnel experimental method of resting train with relative flowing air and dynamic mesh method of moving train were compared. The results of numerical simulation show that the flow field structure around train is completely different between wind tunnel experiment and factual running. Two opposite moving couple of point source and point sink constitute the whole flow field structure during the high speed trains passing by each other. All of streamlines originate from point source (nose) and finish with the closer point sink (tail). The flow field structure around train is similar with different vehicle speed in a long tunnel, and they have a little difference with on the ground.
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Li, Hong Mei, Yan Xuan, Lan Wang, Yan Liang Li, Xing Fang, and Guo Hui Shi. "Research on Numerical Simulation of High-Speed Railway Noise Barrier Aerodynamic Pressure." Applied Mechanics and Materials 274 (January 2013): 45–48. http://dx.doi.org/10.4028/www.scientific.net/amm.274.45.
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Based on finite volume method of finite element method, the aerodynamics models of the train passing through bridge noise barriers (high respectively, for 2.15m, 1.93m) and the subgrade (high respectively, for 2.95m,3.95m) noise barriers is established by large commercial fluid dynamics calculation software. The three dimensional transient outflow field is numerical simulated by applying dynamic mesh technology and large eddy simulation method (LES) for the train passing through noise barriers. The extreme value, schedule curve and pressure cloud contour of fluctuating wind pressures of the different height noise barriers on bridge and roadbed are acquired for 300 ~ 420 km/h different speeds. Extreme values of fluctuating wind pressures product by trains with different speeds are contrast analyzed. The simulation results are very close to the experimental data, proves the validity and feasibility of the finite element model and the accuracy of the parameters. This research provides the theory support to the structural design of the noise barriers and can effectively guide the structural design of the noise barriers.
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Lu, Xiao Lv, and Ri Gao. "The Research of the Application of Reactive Powder Concrete Wind Barriers of High Speed Railway Bridges." Advanced Materials Research 255-260 (May 2011): 886–90. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.886.
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In this paper, completes the selection of preliminary Reactive Powder Concrete (RPC) wind barriers, and on the basis of the theories of the computational fluid dynamics ( CFD), relying on the model-building and analysis platform of FLUENT, 3D models of trains under crosswind with and without wind barriers are built. From the calculation results of the pressure distribution,path lines and aerodynamic forces of model trains under 3D turbulence flows ,the stability of trains under crosswind is analysed ,and the effects of the wind barriers on traffic safety of trains are discussed.The results show that rationa1 design of the wind barriers is able to improve the traffic safety of trains.
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Jakubek, D., S. Herzog, and C. Wagner. "Shape Optimization of High Speed Trains using Adjoint-Based Computational Fluid Dynamics." International Journal of Railway Technology 1, no. 2 (2012): 67–88. http://dx.doi.org/10.4203/ijrt.1.2.4.
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Baranov, L. A. "AUTOMATIC CONTROL OF METRO TRAINS." World of Transport and Transportation 16, no. 3 (June 28, 2018): 156–65. http://dx.doi.org/10.30932/1992-3252-2018-16-3-14.
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For the English abstract and full text of the article please see the attached PDF-File (English version follows Russian version).ABSTRACT The experience of development of domestic automatic traffic control systems for metro trains is analyzed, taking into account high intensity and low redundancy of the line capacity necessary to compensate for disturbances. A brief overview of development of an automated control system is given; the dynamics of changes in the systems of automatic train operation is shown. The analysis of the transformation of algorithms for centralized control of metro trains, the features of time-travel controllers, the requirements for construction of technical means for determining the distance traveled and the speed regime are given. Keywords: metro, automatic traffic control system, dynamics of development, safety, automatic train operation, time-travel controllers, algorithms.
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Seto, Kazuto. "Special Issue on Advanced Vehicle Dynamics and, Control." Journal of Robotics and Mechatronics 7, no. 4 (August 20, 1995): 273. http://dx.doi.org/10.20965/jrm.1995.p0273.
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Various attempts have been made from olden days on vehicles for better riding comfort and for improved maneuverability. Past vehicles have achieved vibration isolation performance, which relaxes impact from road surfaces, by means of link mechanisms and passive suspensions consisting of springs and dampers, as well as basic motion performance such as running, turning, and stopping. However, as far as passenger cars are concerned, a passive suspension has its own limitation, and the contradiction that if riding comfort is to be improved at low speeds, the maneuverability during high-speed operations becomes bad has not been solved. Demand of users has become stronger and stronger for vehicles which satisfy riding comfort and maneuverability at the same time. Moreover, as far as trains are concerned, the past technology has increased the vibration of trains as they are operated at higher speeds; thus a drop in riding comfort has been a cause for preventing high-speed operations. Nevertheless, in line with progress in mechatronic technology, active suspensions have been adopted aggressively in automobiles and trains in recent years, and attempts have been started for improving both riding comfort and maneuverability to satisfy demand of users. Some passenger cars have already appeared which are equipped with an active suspension. A similar trend is found in the case of trains; by the introduction of active suspensions, operations of trains on conventional lines at higher speeds are being started. Under these circumstances, this special issue has been created. Although high performance in vehicles may be achieved by means of active suspensions, the problem of increased energy consumption has become a serious issue, which has been brought to the fore with the bursting of the bubble. This problem seems to be solved by saying how effectively semi-active suspensions may be realized. In this special issue, new trends have been taken up, such as vehicle dynamics, design theory on active suspension systems, reduction of engine vibration by optimum design of hydraulic engine mounts, design of control systems for neural networks of semi-active suspension systems, control of variable structures of suspension systems, predictive control, magnetic levitation suspension, etc. It is hoped that these articles will be useful in future research.
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Savoskin, AN, AA Akishin, and D. Yurchenko. "Dynamics and optimization of a new double-axle flexible bogie for high-speed trains." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 232, no. 5 (October 25, 2017): 1549–58. http://dx.doi.org/10.1177/0954409717737879.
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This paper is focused on the discussion of a new double-axle flexible bogie for high-speed trains. The main feature of the flexible bogie is that it consists of two sub-bogies connected with diagonal links. Moreover, an elastic connection between the carriage and both wheelsets is introduced. These features, which help to increase the flexibility of the bogie while passing tracks with a low radius of curvature, are numerically studied in this paper. The results demonstrate the huge potential of the bogie and its ability to travel without significant oscillations at a speed of 432 km/h. Numerical optimization of the bogie’s parameters is performed in order to maximize ride comfort.
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Li, Heng, Xu Zheng, Wenqiang Dai, and Yi Qiu. "Prediction of Ride Comfort of High-Speed Trains Based on Train Seat–Human Body Coupled Dynamics Model." Applied Sciences 12, no. 24 (December 15, 2022): 12900. http://dx.doi.org/10.3390/app122412900.
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A train seat–human body coupled dynamics model was established to predict the ride comfort of high-speed trains. The train and track and the seat and human body were both coupled in the model. An on-site vibration experiment in a high-speed train was carried out to calibrate each part of the train seat–human body coupled dynamics model. Based on the evaluation method proposed by BS EN 12299:2009, the distribution of ride comfort in the carriage and the effect of seat cushion stiffness and damping on ride comfort were analyzed systematically. The results showed that the seats in the middle of the carriage had the best comfort performance, while those near the side wall and close to the position where the suspension force of the second series was acting were less comfortable. The seat cushion stiffness and damping had great effect on ride comfort.
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Fu, Qiang, and Changjie Zheng. "Three-Dimensional Dynamic Analyses of Track-Embankment-Ground System Subjected to High Speed Train Loads." Scientific World Journal 2014 (2014): 1–19. http://dx.doi.org/10.1155/2014/924592.
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A three-dimensional finite element model was developed to investigate dynamic response of track-embankment-ground system subjected to moving loads caused by high speed trains. The track-embankment-ground systems such as the sleepers, the ballast, the embankment, and the ground are represented by 8-noded solid elements. The infinite elements are used to represent the infinite boundary condition to absorb vibration waves induced by the passing of train load at the boundary. The loads were applied on the rails directly to simulate the real moving loads of trains. The effects of train speed on dynamic response of the system are considered. The effect of material parameters, especially the modulus changes of ballast and embankment, is taken into account to demonstrate the effectiveness of strengthening the ballast, embankment, and ground for mitigating system vibration in detail. The numerical results show that the model is reliable for predicting the amplitude of vibrations produced in the track-embankment-ground system by high-speed trains. Stiffening of fill under the embankment can reduce the vibration level, on the other hand, it can be realized by installing a concrete slab under the embankment. The influence of axle load on the vibration of the system is obviously lower than that of train speed.
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Zhang, Yadong, Jiye Zhang, Tian Li, Liang Zhang, and Weihua Zhang. "Research on Aerodynamic Noise Reduction for High-Speed Trains." Shock and Vibration 2016 (2016): 1–21. http://dx.doi.org/10.1155/2016/6031893.
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A broadband noise source model based on Lighthill’s acoustic theory was used to perform numerical simulations of the aerodynamic noise sources for a high-speed train. The near-field unsteady flow around a high-speed train was analysed based on a delayed detached-eddy simulation (DDES) using the finite volume method with high-order difference schemes. The far-field aerodynamic noise from a high-speed train was predicted using a computational fluid dynamics (CFD)/Ffowcs Williams-Hawkings (FW-H) acoustic analogy. An analysis of noise reduction methods based on the main noise sources was performed. An aerodynamic noise model for a full-scale high-speed train, including three coaches with six bogies, two inter-coach spacings, two windscreen wipers, and two pantographs, was established. Several low-noise design improvements for the high-speed train were identified, based primarily on the main noise sources; these improvements included the choice of the knuckle-downstream or knuckle-upstream pantograph orientation as well as different pantograph fairing structures, pantograph fairing installation positions, pantograph lifting configurations, inter-coach spacings, and bogie skirt boards. Based on the analysis, we designed a low-noise structure for a full-scale high-speed train with an average sound pressure level (SPL) 3.2 dB(A) lower than that of the original train. Thus, the noise reduction design goal was achieved. In addition, the accuracy of the aerodynamic noise calculation method was demonstrated via experimental wind tunnel tests.
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Wang, Zhiwei, Yao Cheng, Guiming Mei, Weihua Zhang, Guanhua Huang, and Zhonghui Yin. "Torsional vibration analysis of the gear transmission system of high-speed trains with wheel defects." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 234, no. 2 (March 6, 2019): 123–33. http://dx.doi.org/10.1177/0954409719833791.
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The gear transmission system of a high-speed train is the key component, which delivers the traction torque from the motor to the wheelset. It couples with the vehicle system via the suspension system, gear meshing and the wheel–rail interface. The dynamic performance of the transmission system directly affects the operational reliability or even the running safety of high-speed trains. In this study, the effects of wheel polygonalisation and wheel flat on the dynamic responses of the transmission system are investigated through simulations of a novel vehicle dynamics model. This model integrates the flexible gearbox housing, the time-varying mesh stiffness and the nonlinear gear tooth backlash, and the track irregularities to obtain more realistic responses of the traction transmission systems in a vehicle vibration environment, from motors to wheelsets, under the effects of the wheel flat and polygonal wear. The field experimental tests are implemented for a vehicle running along a main high-speed railway line in China. Subsequently, the developed dynamics model is validated with good agreement between the experimental and the theoretical results. The calculated results revealed that wheel flat and wheel polygonal wear caused a high-frequency fluctuation of both the longitudinal creep force and the gear mesh force, causing a violent and complex torsional vibration of the gear transmission system. Moreover, the flexible deformation of the gearbox housing, especially its resonance due to the wheel polygonal wear, contributed to the torsional vibration of the gear transmission system.
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Qi, Yayun, and Huanyun Dai. "Influence of motor harmonic torque on wheel wear in high-speed trains." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 234, no. 1 (February 21, 2019): 32–42. http://dx.doi.org/10.1177/0954409719830808.
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With the increase of train speed, the harmonic torque of the traction motor of a high-speed train is not a negligible source of excitation. In order to explore the influence of the harmonic torque of the motor on wheel wear, a high-speed EMU vehicle model was established based on the multibody dynamics theory. FASTSIM was used to calculate the wear parameters, and the Zobory wear model was used to calculate the depth of the wheel wear. The influence of the harmonic torque of the motor on the wear parameters and wear depth of high-speed trains under straight and curve conditions is calculated, respectively. The simulation results show that the harmonic torque has a large influence on the wheel rail vertical force and the longitudinal creep force and has little influence on the lateral creep force. With the 30% harmonic torque, the wheel rail vertical force increases by 7.6%, the longitudinal creep force increases by 15%, and the lateral creep force increases by 4%. The amplitude of the longitudinal creepage increases by 14.2% when the harmonic torque is 10%, and increases by 34.4% when the harmonic torque is 30%. When the harmonic torque increases, the wheel wear depth increases, the 10% harmonic torque increases by 3% and the 30% harmonic torque increases by 8%, and the increase of the motor harmonic component accelerates the wheel wear. At the same time, small longitudinal positioning stiffness can help to reduce the influence of the harmonic torque, and the selection of the longitudinal positioning stiffness needs to consider the dynamic performance of the vehicle.
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Li, Tian, Ming Li, Zheng Wang, and Jiye Zhang. "Effect of the inter-car gap length on the aerodynamic characteristics of a high-speed train." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 233, no. 4 (September 20, 2018): 448–65. http://dx.doi.org/10.1177/0954409718799809.
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In wind tunnel experiments, the inter-car gaps are designed in such a way as to separate the force measurements for each car and prevent the interference between cars during tests. Moreover, the inter-car gap has a significant effect on the aerodynamic drag of a train. In order to guide the design of the inter-car gaps between cars in wind tunnel experiments, the impact of the inter-car gap length on the aerodynamic characteristics of a 1/8th scale high-speed train is investigated using computational fluid dynamics. The shear stress transport k-ω model is used to simulate the flow around a high-speed train. The aerodynamic characteristics of the train with 10 different inter-car gap lengths are numerically simulated and compared. The 10 different inter-car gap lengths are 5, 8, 10, 15, 20, 30, 40, 50, 60, and 80 mm. Results indicate that the aerodynamic drag coefficients obtained using computational fluid dynamics fit the experimental data well. Rapid pressure variations appear in the upper and lower parts of the inter-car gaps. With the increase of the inter-car gap length, the drag force coefficient of the head car gradually increases. The total drag force coefficients of the trains with the inter-car gap length less than 10 mm are practically equal to those of the trains without inter-car gaps. Therefore, it can be concluded from the present study that 10 mm is recommended as the inter-car gap length for the 1/8th scale high-speed train models in wind tunnel experiments.
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Hou, Tao, Yang-yang Guo, and Hong-xia Niu. "Research on speed control of high-speed train based on multi-point model." Archives of Transport 50, no. 2 (June 30, 2019): 35–46. http://dx.doi.org/10.5604/01.3001.0013.5579.
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The traditional train speed control research regards the train as a particle, ignoring the length of the train and the interaction force between carriages. Although this method is simple, the control error is large for high-speed trains with the characteristics of power dispersion. Moreover, in the control process, if the length of the train is not considered, when the train passes the slope point or the curvature point, the speed will jump due to the change of the line, causing a large control error and reducing comfort. In order to improve the accuracy of high-speed train speed control and solve the problem of speed jump when the train runs through variable slope and curvature, the paper takes CRH3 EMU data as an example to establish the corresponding multi-point train dynamics model. In the control method, the speed control of high-speed train needs to meet the fast requirement. Comparing the merits and demerits of classical PID control, fuzzy control and fuzzy adaptive PID control in tracking the ideal running curve of high-speed train, this paper chooses the fuzzy adaptive PID control with fast response. Considering that predictive control can predict future output, a predictive fuzzy adaptive PID controller is designed, which is suitable for high-speed train model based on multi-point. The simulation results show that the multi-point model of the high-speed train can solve the speed jump problem of the train when passing through the special lines, and the predictive fuzzy adaptive PID controller can control the speed of the train with multi-point model, so that the train can run at the desired speed, meeting the requirements of fast response and high control accuracy.
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Liu, Jiankun, Zuhua Jiang, and Hongming Zhou. "Integrated operation and maintenance optimization for high-speed train fleets considering passenger flow." Eksploatacja i Niezawodnosc - Maintenance and Reliability 24, no. 2 (April 15, 2022): 297–305. http://dx.doi.org/10.17531/ein.2022.2.11.
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A joint optimization model of maintenance and operation of high-speed train fleets is established with the optimization objective of minimizing the total costs, considering dynamic passenger flow and maintenance resources. A new maintenance strategy CCPM (Coordinating Conflicts Preventive Maintenance) is proposed to optimize the problem. The effectiveness of the model and the strategy are verified by numerical examples. The comparison between the strategy in the paper and the existing approach proves that the new strategy is more effective and shows the importance of considering dynamic passenger flow. The model and the strategy provide decision support for the actual high-speed trains operation and maintenance program. This study also offers new ideas to the subsequent research on preventive maintenance of high-speed trains.
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Deng, Yong Quan, Tian Li, Yi Sheng Zou, Ji Ye Zhang, and Wei Hua Zhang. "Equilibrium Characteristics of High-Speed Train in Crosswind." Applied Mechanics and Materials 275-277 (January 2013): 532–36. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.532.
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A fast approach to high-speed train co-simulation between aerodynamics and train-track coupling dynamics is presented. With this method, the fluid-structure dynamic performances of a high-speed train are simulated with different crosswind velocity and train velocity. The aerodynamic forces and train dynamics are compared under off-line simulation and equilibrium state method. Considering the fluid-structure interaction, there is significant influence on the head aerodynamics and train dynamics. The results show that it is necessary to consider changing attitude in crosswind
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Liu, Yumei, Ting Hu, Yun Chen, Zixu Hao, and Ming Liu. "Dynamic Fatigue Analysis of High-Speed Trains Gearbox Using Copula Function." Mathematical Problems in Engineering 2022 (July 30, 2022): 1–15. http://dx.doi.org/10.1155/2022/1088747.
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As a key component of the transmission system of high-speed trains, the reliability of gearbox is crucial to the overall reliability and driving safety of high-speed trains. In this work, a comprehensive reliability model for the key parts of the gearbox including the driving and driven gears, bearings, and gearbox housing is developed, which combines the strength degradation parameters obtained by P-S-N curves of the corresponding material, and a stress-strength interference model based on the Poisson distribution of random stress and the Wiener strength degradation process. Further, a nested Copula function reliability model of the gearbox series system is developed using the binary Frank Copula function considering the correlation of failures of different parts and different failure modes. This model realizes the dynamic reliability analysis of the gearbox under different failure modes. The reliability analysis of the key parts of the gearbox and the gearbox series system of high-speed train achieved with this model are in line with the engineering practice. This method enables dynamic tracking and monitoring of gearbox reliability during the service life of high-speed train.
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XIA, CHAOYI, HE XIA, NAN ZHANG, and WEIWEI GUO. "EFFECT OF TRUCK COLLISION ON DYNAMIC RESPONSE OF TRAIN–BRIDGE SYSTEMS AND RUNNING SAFETY OF HIGH-SPEED TRAINS." International Journal of Structural Stability and Dynamics 13, no. 03 (April 2013): 1250064. http://dx.doi.org/10.1142/s0219455412500642.
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A dynamic analysis model is established for a coupled high-speed train and bridge system subjected to collision loads. A 5 × 32 m continuous high-speed railway bridge with PC box girders is considered in the illustrative case study. Entire histories of a CRH2 high-speed EMU train running on the bridge are simulated when the truck collision load acts on the bridge pier, from which the dynamic responses such as displacements and accelerations of the bridge, and the running safety indices such as derailment factors, offload factors and lateral wheel/rail forces of the train are computed. For the case study, the running safety indices of the train at different speeds on the bridge when its pier is subjected to a truck collision with different intensities are compared with the corresponding allowances of the Chinese Codes. The results show that the dynamic response of the bridge subjected to truck collision loads is much greater than the one without collision, which can drastically influence the running safety of high-speed trains.
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Teng, Wanxiu, Huailong Shi, Ren Luo, Jing Zeng, and Caihong Huang. "Improved nonlinear model of a yaw damper for simulating the dynamics of a high-speed train." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 233, no. 7 (October 9, 2018): 651–65. http://dx.doi.org/10.1177/0954409718804414.
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The aim of this paper is to establish a simple and accurate nonlinear model of a yaw damper for the dynamic numerical simulation of high-speed trains. An improved nonlinear yaw damper model is proposed based on the traditional Maxwell model. It comprises a piecewise linear force–displacement spring and a piecewise linear force–velocity damper in series. These nonlinear inputs for the model are retrieved from the dynamic performance tests of the damper, and the force–displacement and force–velocity curves are further modified to improve the modelling accuracy according to the test results. The proposed model can accurately simulate the damper's dynamic stiffness and dynamic damping characteristics with respect to the excitation frequency or displacement, which cannot be reproduced when using the traditional Maxwell model. Both the traditional Maxwell model and the improved nonlinear model presented in this work are integrated into a multibody dynamics railway vehicle model to simulate the typical dynamic problems of a high-speed train operating at 250 km/h in northeast China. Through comparative analysis, it was found that the numerical simulations are consistent with the field measurements. It can be concluded that the proposed nonlinear damper model is more suitable for studying railway vehicle system dynamics under various operating cases. By contrast, the input parameters of the traditional Maxwell model must be modified artificially according to the vehicle responses and the dynamic characteristics of the yaw damper.
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Lalewicz, Piotr, and Danuta Bryja. "Aerodynamic coefficients of railway vehicles in cross-wind – introduction and preliminary research." Transportation Overview - Przeglad Komunikacyjny 2019, no. 6 (June 1, 2019): 11–20. http://dx.doi.org/10.35117/a_eng_19_06_02.
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In recent years, dynamic development of high-speed railways is observed in Europe and in the world. Due to the train speeds increase, aerodynamics of railway vehicles becomes more and more important issue. In the paper, the cross-wind stability problem of a railway vehicle and the influence of the train speed on this phenomenon is discussed. As a derailment risk analysis requires to determine in total six cross-wind aerodynamic forces and moments acting on a given vehicle, a knowledge of six associated with them aerodynamic coefficients is a groundwork for train stability analysis. Two most common methods of analysis of air flow around trains are pointed out – wind tunnel testing and CFD method (Computational Fluid Dynamics method). Both methods are described in the paper, in reference to PN-EN 14067-6:2018-10 and TSI requirements, and later a CFD method is applied to examine a basic train model. The main aim of this preliminary research was to recognize CFD method as a tool for a further research on cross-wind-induced vibrations of a train - bridge system.
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Diachenko, Leonid, and Vladimir Smirnov. "Dynamic Interaction of the “Bridge-Train” System on High-Speed Railways." E3S Web of Conferences 157 (2020): 06015. http://dx.doi.org/10.1051/e3sconf/202015706015.
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This work contains the results of a research of the dynamic processes in the “bridge-train” system while passenger trains move over a bridge structure (overpass) in high-speed. The article presents the methodology of mathematic modelling, and the basic differential equations of the studied system elements motion are provided. Also there is a description of dynamic interaction of the bridge-train system numerical model based on the FEM. In general, taking into account in the design scheme of the “bridge” system not only spans, but also piers with a foundation, it is possible to more accurately determine the values of the bridge natural frequencies, which is a key factor in assessing the dynamic response of a structure when passing a high-speed train.