最新刊期
期 6 ， 2020
- 摘要：Compared with the traditional wheel-rail train, the maglev train is more vulnerable to lightning strikes due to the lack of contact net protection. In severe cases, it will cause damage to the vehicle-mounted equipment and affect the safety of the train. In order to analyze the indirect effect of lightning on maglev train, the 3D model of maglev train was established, and the CST transmission-line matrix method was used to study the coupling law of cables inside the maglev train under lightning strike. The simulation research result showed that different types of cables had different coupling characteristics, and the induced current on the shielded cable and the unshielded cable was obviously different. With the increase of the distance between the unshielded cable and the bottom of the vehicle, and the increase of the length of the cable, the induced current of the unshielded cable showed an increasing trend. The proposed method could effectively simulate the indirect effects of cable coupling caused by lightning strikes on maglev trains, and laid a foundation for further research on the protection technology of indirect lightning effects of maglev trains.关键词：maglev train;transmission-line matrix method;indirect effect;cable coupling;numerical simulation
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发布时间：2021-12-09 - 摘要：When the running speed of high-speed maglev vehicle reaches 600 km/h (running 550 km/h continuously), the radiated noise has a great impact on the environmental noise along the line. In the design stage of maglev vehicle, the high-speed noise source intensity was deduced according to the existing noise data, and the mode prediction was carried out according to The guidance on noise and vibration source intensity values and treatment principles in environmental impact assessment of railway construction projects (2010 Revision) (TJ [2010] No. 44). According to the measurement method, the environmental noise along the line was predicted and evaluated, and the corresponding control measures and calculation verification were implemented to solve the problem of excessive environmental noise. The results show that the influence of noise radiated by maglev system on the acoustic environment along the line could be effectively reduced by adding noise barriers and aerodynamic optimization of vehicles, and the noise along the line could meet the requirements of railway boundary noise and acoustic environment quality standards..关键词：high-speed maglev;noise emission;environmental noise;control measures
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发布时间：2021-12-09 - 摘要：The electromagnetic suspension maglev vehicle is driven by the long stator linear motor, and the stators are laid along the track. Therefore, the step-changing method is adopted to supply power to the linear motor in sections to reduce energy consumption and ensure the terminal voltage of the motor. The long stator linear synchronous motor step-changing mode of high-speed maglev vehicle was studied, and by comparing the influence of the step-changing characteristics of two-step method and three-step method on traction characteristics and dynamic performance of maglev vehicle, the applicable operating conditions of the two step-changing modes were analyzed. The simulation results showed that the two-step method could be used in uniform velocity segment to reduce equipment investment, the three-step method had better performance than the two-step method and had higher propulsion capability.关键词：high-speed maglev vehicle;step-changing method;long stator linear synchronous motor;two-step method;three-step method;simulation
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发布时间：2021-12-09 - 摘要：In an instant, when the train enters the tunnel from the open line, the air flow space around the train suddenly becomes smaller, and the air in front of the train is compressed and the air pressure increases sharply, forming an initial compression wave, which propagates to the tunnel exit at the local sound speed. When the rear of the train entered the tunnel, as the space occupied by the rear of the train was released, the air pressure suddenly dropped, forming an expansion wave. Compression waves and expansion waves propagated to the tunnel port and were reflected as waves with opposite properties. The two superimpose on each other, resulting in severe pressure fluctuations in the tunnel. The one-dimensional unsteady compressible non-homentropic flow model and generalized Riemann variable characteristic line method were used to numerically simulate the pressure wave of the maglev train passing through tunnel at a speed of 600 km/h. Through the analysis of the formation mechanism of pressure changes in the tunnel, the changing characteristics of the aerodynamic load in the tunnel was revealed, as well as the changing law between the amplitude of the surface pressure of the car body and the length of the tunnel, train speed, and blocking ratio. The research results could provide data reference for the design of aerodynamic loads in the tunnel and car body when the high-speed maglev train passes through the tunnel.关键词：high-speed maglev train;tunnel;pressure wave;pressure load;one-dimensional flow model;characteristic line method
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发布时间：2021-12-09 - 摘要：In order to predict for maglev track irregularity accurately, according to structure composition and technical characteristics of high-speed maglev track line, a irregularity fitting method of high-speed maglev track based on normal distribution superposition principle was applied. Based on the characteristic length of track (l=l 032 mm), the deviation characteristics was analyzed at the position of the length l, guide foundation length 3l, bridge 1/2 span length, span and 2 times span. The deviations of other non-nodes were fitted by linear interpolation method, the time domain track irregularity data was obtained by deviation superposition. Compared with the measured data, it was found that the irregularity of high-speed maglev track was obviously periodic, especially, the vertical irregularity had the same periodic frequency as the first order vertical bending of the bridge; In the short wave range (λ<5 m), the high-speed maglev spectrum was higher than the traditional wheel/rail spectrum. The range of medium and long waves of high-speed maglev was between the high speed ballastless spectrum in China and the low interference spectrum in Germany. The irregularity prediction method had general applicability to the line spectrum prediction of known construction technical requirement.关键词：high-speed maglev;track irregularity;normal distribution superposition;stochastic process;prediction method
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发布时间：2021-12-09 - 摘要：The research status of maglev wireless communication technology at home and abroad was introduced, focusing on the communication technology solutions of Shanghai maglev special line, Japan Yamanashi test line and US super high-speed railway competition; according to the characteristics of high-speed maglev train, the development orientation, business requirements and technical characteristics of maglev wireless communication were analyzed; combined with the mainstream communication technology, the key technologies of maglev wireless communication were analyzed, and the future research direction was discussed.关键词：rail transit;high-speed maglev;low vacuum pipeline;wireless communication;5G communication;high-speed railway
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发布时间：2021-12-09 - 摘要：Taking the high-speed maglev train as research object, the multi-body dynamic model of single vehicle and marshaling train were established. For the different running speeds, the line evaluation conditions of straight line and horizontal curves were set. The dynamic performances of maglev single vehicle model and train model were investigated under high-speed running conditions. The dynamic difference induced by the modeling method was analyzed from the aspects of levitation and guidance ability, vibration level and so on. The research showed that, the dynamic coupling effect between vehicles mainly affected the levitation performance. On straight line, the maximum increases of levitation force and gap calculated by the train model could reach 5 kN and 0.4 mm respectively compared with that of the single-vehicle model. In curve negotiation condition, the levitation force and carbody vertical acceleration obtained from the train model increased by about 5 kN and 0.09 m/s2 respectively with respect to that of the single-vehicle model. The different modeling methods had little influence on the lateral dynamic interaction and vibration level of maglev vehicle.关键词：maglev train;dynamic performance;curving negotiate;simulation
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发布时间：2021-12-09 - 摘要：As a new type of transportation system, the vacuum tube high-speed traffic has become a research hotspot and a key development direction in the world. The vacuum tube pressure, blockage ratio, aerodynamic drag, maglev system, vehicle body, etc. were mainly studied by domestic and foreign scholars at present. So combined with the medium and low speed maglev transit, high-speed maglev transportation design specification and design philosophy, the main problems such as tube structure, material, temperature load and fatigue load of the bridge structure in low vacuum tube high-speed maglev railway were preliminarily discussed .关键词：low vacuum tube;high-speed maglev railway;bridge structure;ETT;high-speed train
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发布时间：2021-12-09 - 摘要：Taking Guangzhou-Shenzhen-Hong Kong high-speed maglev railway in Guangdong-Hong Kong-Macau Greater Bay Area as an example, the passenger flow forecast of high-speed maglev railway with a speed of 600 km/h was explored. By means of big data, the characteristics of passenger flow in Guangdong-Hong Kong-Macau Greater Bay Area and along the line was analyzed, and the demand forecasting model of Guangdong-Hong Kong-Macau Greater Bay Area was established based on the "four-step Method". The passenger flow index of Guangzhou-Shenzhen-Hong Kong high-speed maglev project was forecasted, which provided passenger flow support for the project promotion.关键词：high-speed maglev;passenger flow forecast;big data;Guangdong-Hong Kong-Macau Greater Bay Area
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发布时间：2021-12-09 - 摘要：Based on Faraday's law of electromagnetic induction, the mathematical model of eddy current braking force was established, and the factors influencing the eddy current braking force were analyzed. The tangential braking force and normal suction force of the eddy current brake of TR08 high-speed maglev train in Germany under the air gaps of 8 mm, 11 mm, 15 mm and 19 mm were calculated by using the finite element simulation analysis method. The simulation results were consistent with the test data, which met the requirements of train safety braking deceleration.关键词：high-speed maglev;eddy current braking;mathematical model;simulation;high-speed train;finite element method
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发布时间：2021-12-09 - 摘要：When the maglev train runs into the tunnel at a certain speed, it will produce the initial compression wave, which will propagate towards the tunnel exit at the local sound speed, and radiate to the surrounding at the tunnel exit to form the micro pressure wave. When the micro pressure wave is large enough, it will produce the sound explosion, which will cause serious harm to the environment, and the micro pressure wave at the entrance is closely related to the initial compression wave. Based on the three-dimensional compressible unsteady turbulent flow Reynolds averaged Navier Stokes equation and SST K - ω two equation turbulent flow model, the air flow and initial compression wave caused by maglev train entering the tunnel were numerically simulated by using the fi nite volume method and overlapping grid technique. The results showed that the initial compression wave had three-dimensional characteristics in the process of the train entering the tunnel, and after a certain distance, it became one-dimensional plane wave; secondly, at the same height, the closer to the car body, the greater the change of the compression wave, the closer to the car body and the closer to the ground, the greater the change of the compression wave, while the change of the initial compression wave far away from the car body was basically the same; The maximum pressure gradient of initial compression wave is approximately proportional to the third power of train speed.关键词：medium-speed maglev train;tunnel;initial compression wave;numerical simulation
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发布时间：2021-12-09 - 摘要：Operation scene is the foundation and guidance of a project that mainly reflects the concept, demand of operation, and reflecting the function of each equipment and basis of post setting, and the linkage of the system. In order to design and construct the high-speed EMS maglev railway project in a more reasonable, efficient and comprehensive way, it is necessary to conduct systematic analysis and research on the operation scenarios. By comparing the differences between the architecture, the vehicle control modes and the line conditions of the high-speed maglev system and that of the wheel rail transit system, and on the basis of fully absorbing and borrowing the existing operation modes and scenarios of the wheel rail transit and Shanghai high-speed EMS maglev demonstration line, combined with the operation requirements of the long and large trunk lines, the framework of the operation scenarios of the high-speed EMS maglev railway was put forward, which has a certain guiding role for the follow-up research of the high-speed EMS maglev line.关键词：operation scene;high-speed EMS maglev railway;wheel rail traffic;train control mode;line conditon
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发布时间：2021-12-09 - 摘要：To meet the requirements of simulating a large amount of communication between the section control systems and the on-board communication devices for wireless communication in high-speed maglev system, a high-speed maglev wireless communication system simulation platform using C++ language was established. Based on the specific wireless communication method and data format of the high-speed maglev system, the platform architecture design, UI design and control program were implemented, which successfully reduced the communication delay to less than 4 ms. The platform had the capability for configuring the network nodes, which established a foundation for studying the interferences of the system-level wireless communication functions on the safety of high-speed maglev operation.关键词：high-speed maglev;wireless communication;simulation platform;communication delay
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发布时间：2021-12-09 - 摘要：For the insufficient levitation-drag ratio problem of EDS system with traditional rectangular permanent magnet Halbach array, the convex Halbach array with more reasonable magnetic field distribution was adopted for improvement. Firstly, the mechanical properties of EDS system were analyzed theoretically, and the influence of magnetic field distribution on levitation-drag ratio was studied; secondly, the horizontal and vertical components of magnetic field in convex and rectangular Halbach arrays were compared, according to the characteristics of magnetic field distribution of convex array and the theoretical analysis results, the reason why it can optimize levitation-drag ratio was given; finally, the convex Halbach array was applied to the EDS system, the optimization effect of levitation-drag ratio was verified by finite element simulation. The results showed that compared with the traditional rectangular permanent magnet array, convex permanent magnet array could improve the magnetic field and its distribution, which could effectively improve the levitation-drag ratio. The research results can be used to optimize the operation performance of permanent magnet electric maglev train and improve the applicability of permanent magnet electric suspension technology in the field of rail transit.关键词：EDS system;magnetic field distribution;convex Halbach array;rectangular permanent magnet Halbach array;levitation-drag ratio;simulation
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发布时间：2021-12-09 - 摘要：In view of the current situation that the traditional heat pipe radiator structure cannot meet the heat dissipation requirements of the maglev train traction converter, a double-sided cooling heat pipe radiator was proposed suitable for high heat flux density. The research methods of numerical simulation and experimental testing were used to compare the double-sided heat pipe radiator with the same volume TM36 profile radiator and CRH2 high-speed EMUs heat pipe radiator. The results showed that under the same air volume and power, the heat dissipation efficiency of double-sided heat pipe radiators with similar volumes of TM36 profile radiators was increased by 32% while the wind resistance was reduced by 35%, the heat dissipation performance of the heat pipe radiators for CRH2 high-speed EMUs was almost the same, but the cost and space could be saved by more than 50%.关键词：maglev train;heat pipe radiator;double-sided cooling;numerical simulation;IGBT
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发布时间：2021-12-09 - 摘要：A new type of maglev traffic system was studied, which could adapt to the peak hour one-way section passenger flow of 10000 passengers or less. Through the system miniaturization, equipment lightweight and system structure optimization design of the current medium and low speed maglev technology mode, the project cost was reduced, the vehicle performance was improved, and the product types of maglev transportation were enriched, which covered the application fields of maglev traffic sequence with speed under 100 km/h .关键词：middle and low speed maglev;miniaturization;lightweight;system design;urban rail transit
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发布时间：2021-12-09 - 摘要：The rapid train passing through the tunnel will cause severe pressure wave phenomenon, which will lead to the problem of passengers' ear discomfort. In order to reduce the severe pressure wave and ensure the comfort of passengers, it is necessary to make a reasonable clearance area of the tunnel. In this paper, a one-dimensional compressible unsteady isentropic flow model and generalized Riemannian variable characteristic line method were used to simulate the pressure wave in the tunnel, and the basic characteristics of the pressure change in the vehicle every 3 seconds during the middle and low speed maglev train passing through the single track tunnel were studied. The basic characteristics of the influence of train speed, blocking ratio, tunnel length and air tightness of the car body on the pressure change in the car every 3 seconds were obtained. According to the domestic railway pressure comfort standards, the proposed values of single track maglev tunnel clearance area under different car body air tightness were provided, which could support the design of medium and low speed maglev line tunnel clearance area.关键词：medium and low speed maglev train;single track tunnel;pressure wave;one dimensional flow model;characteristic line method
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发布时间：2021-12-09 - 摘要：Aiming at the problem that the levitation system of the maglev train has strong nonlinearity and the control effect of the commonly used linear control law is not ideal, the nonlinear control law of the levitation system based on multi-dimensional Taylor network (MTN) optimal control was proposed. The simulation results showed that the control law based on MTN optimal control had better anti-interference performance for gap and load than PID control law.关键词：maglev train;levitation control;multi-dimension Taylor network;nonlinear;PID control law
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发布时间：2021-12-09 - 摘要：The operation stability of new four modules middle-low speed air spring center-position maglev vehicle was simulated by using the SIMPACK. The simulation results showed that when the speed of maglev vehicle exceeded a certain critical speed on a straight track, the lateral instability of the suspension frames would occur. Further analysis revealed that the lateral instability of suspension frames was related to vehicle weight and track irregularities, but not to levitation control. After the ball joints were installed at the end of the adjacent suspension frames, the new four modules maglev vehicle could operate stably in low speed range (less than 130 km/h). Finally, not only the lateral shock absorbers were installed between the two ends of the suspension frames under the fixed sliding platforms and the vehicle body, but also the lateral shock absorbers were installed between the outer ends of the suspension frames under the sliding platforms and the vehicle body, so the maglev vehicle could operate stably in the whole speed range.关键词：four modules maglev vehicles;air spring center-position;lateral instability;shock absorbers;simulation;maglev vehicle
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发布时间：2021-12-09 - 摘要：Compared with single train running in the tunnel, maglev trains crossing in the tunnel will produce greater pressure fluctuation, and the transient pressure is transferred from the outside to the inside at the same time. The pressure fluctuation inside and outside the vehicle may affect the comfort of drivers and passengers and lead to aerodynamic fatigue damage of the vehicle body. Based on the relevant technical parameters of maglev train in China, the generalized Riemannian variable characteristic line method of one-dimensional compressible isentropic flow model was used to study the pressure wave inside and outside maglev trains during trains crossing in tunnel with equal velocity, and the most unfavorable position of crossing in tunnel was determined. The results showed that the pressure fluctuation inside and outside trains was the most severe when the trains met at the tunnel center with equal velocity.关键词：medium and low speed maglev tunnel;maglev train;crossing pressure wave;one-dimensional compressible isentropic flow model;characteristic line method
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发布时间：2021-12-09 - 摘要：The construction scheme of vehicle-ground communication system of Changsha maglev express line and Beijing maglev line (S1 line) and its shortcomings were analyzed. On the basis of deep study on the demand of medium-low speed maglev transit vehicle-ground communication service and main wireless communication technology, a LTE-M based full integrated carrying scheme was proposed, and the adaptability of the scheme to different frequency resources, different speed and anti-interference measures were further analyzed.关键词：medium-low speed maglev transit;vehicle-ground communication;comprehensive load;anti-interference;LTE-M;WLAN
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发布时间：2021-12-09 - 摘要：In order to evenly distribute the lateral load of the vehicle to each suspension frame module, the medium and low speed maglev vehicles are equipped with a guide mechanism. Due to the large space span, large range of motion and the large load on the guide mechanism when the maglev vehicle enters and leaves the small radius curve, the installation space and weight of the guide mechanism are large. Therefore, it is very important to study the influence of guiding mechanism on vehicle operation for optimizing guiding structure and lightweight design. The structure and existing problems of the guiding mechanism in the medium and low speed maglev vehicle with four suspension frames were introduced, and the influence with and without the guiding mechanism on the running performance of the vehicle were compared and analyzed. An optimization scheme of the guiding mechanism was put forward, which could reduce the load of the guiding mechanism on the premise of ensuring the safe operation of the vehicle.关键词：medium and low speed maglev;guide mechanism;four suspension frame;operation performance;optimization design;urban rail transit;simulation
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发布时间：2021-12-09 - 摘要：The box of the maglev electromagnet in the maglev state will produce deflection deformation because of suction and impact. A flexible fixing mechanism was designed to fix the magnetic yoke to avoid the coupling stress between the magnetic yoke and the box in the deformation process. Combined leaf springs were designed on both sides of the magnetic yoke so that the magnetic yoke was in a pretension state. When the magnetic yoke was moved by the impact, the leaf springs can make it return to its original position and achieve goal of the flexible fixation. Through the design theory and simulation calculation, the load-displacement relationship between the leaf spring with different thickness was analyzed, and the stiffness and strength of the leaf spring meeting the requirements were designed. The experimental results showed that the design method was feasible and effective关键词：maglev electromagnet;maglev train;leaf spring;flexible fixation;spring stiffness;strength;finite element method;simulation
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发布时间：2021-12-09
Maglev Technology Column
- 摘要：A four-quadrant converter control strategy of locomotive based on synchronous sampling was studied, and the adopted carrier generation scheme and synchronous modulation strategy were introduced. The MATLAB simulation and grid measurement results showed that this method could effectively reduce the harmonic content of AC input current of the locomotive to improve the current quality.关键词：four-quadrant converter;synchronous sampling;synchronous modulation;harmonic suppression;electric locomotive;EMU;simulation
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发布时间：2021-12-09 - 摘要：Based on the analysis of existing blocking system and train control mode of heavy haul railway, combined with current application of moving block, the key points and difficult problems of heavy haul railway adopting moving block were analyzed. And then, a two-step engineering implementation solution for realizing moving block in heavy haul railway was proposed from the points of view of low cost and less impact, which was suitable to be extended to the transformation and upgrading of heavy haul railway.关键词：heavy haul railway;heavy haul train;moving block;automatic train protection;train control system;computer based interlocking
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发布时间：2021-12-09 - 摘要：Combined with the application characteristics of 200 km/h passenger car bogies, the selection and analysis of key components were carried out in detail. It was proposed that the 200 km/h passenger car bogies adopt the structure of unconnected sleeper beam and the mode of direct connection between bogie and car body. The frame strength test and dynamic calculation were completed and passed. The test results showed that the 200 km/h passenger car bogie could meet the requirements of different line conditions from 160 km/h to 250 km/h by adjusting the suspension parameters.关键词：high-speed train;bogie;structure design;simulation
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发布时间：2021-12-09
Research & Development
- 摘要：To investigate the influence of suspension parameters on the curve passage performance of metro vehicle under crosswind in mountain city, the targeted type-B vehicle dynamics model was established in the mountain city. The influence of the windward angle, loading crosswind, track irregularity, primary & secondary suspension lateral stiffness and deflection ratio between suspensions on vehicle curve passage under crosswind was analyzed by simulating. The results showed that the maximum values of crosswind loads appeared near the windward angle α = 90°. The lateral stiffness of the primary suspension was more important than that of secondary suspension. The increase of lateral stiffness of the primary and secondary suspension, and deflection ratio made it more difficult to pass the curve under the crosswind. The recommended lateral stiffness of the primary suspension was kpy=9-11 MN/m, and the recommended lateral stiffness of the secondary suspension was ksy=0.2 MN/m.关键词：mountain city;metro vehicle;crosswind turbulence;primary suspension;secondary suspension;simulation
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发布时间：2021-12-09 - 摘要：The function of the grounding system is related to the operation performance of the metro vehicles, so it has special significance to conduct a research. The classification and definition of the vehicle grounding was introduced, including protective earthing, functional bonding and EMC-related grounding. The advantage and disadvantage of different earthing topology forms and the influence to the carbody current and EMC were analyzed by the circuit simulation and analysis methods, and vehicle grounding mode with grounding resistance decoupling function was recommended. For systems grounding, by comparing two different earthing methods of single-point and multiple-point, the latter was recommended.关键词：metro vehicle;grounding;protective earthing;functional bonding;EMC;single-point earthing;multiple-point earthing
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发布时间：2021-12-09
Urban Rail & Vehicle
- 摘要：Aiming at the requirements of rail transit operation and maintenance for rail and tunnel inspection, the current situation and outstanding problems of rail transit inspection were analyzed, and the differences of inspection methods at home and abroad were pointed out. Combined with the development trend of big data, internet of things, artificial intelligence, unmanned driving, robot and other cutting-edge technologies, the development direction of robot intelligent inspection was proposed. According to the special application environment characteristics of rail transit, the seven key technology research directions of rail transit inspection robot were pointed out. Finally, the application prospect of rail transit inspection robot was prospected.关键词：intelligent inspection;inspection robot;track inspection;rail;tunnel;high-speed railway;metro
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发布时间：2021-12-09 - 摘要：The autonomous rail rapid transit (ART) is powered by electric power but uses a hydraulic system to achieve steering function. If the electric drive electric cylinder can be used to realize the steering function, it will effectively save the installation space of the steering system, and can avoid the loss of energy in the conversion process, and achieve the purpose of energy saving and emission reduction. The continuously improving power weight ratio of the modern servo motor also created conditions for achieving this goal. In this paper, the mathematical model of the electric cylinder steering system of the ART was established firstly, and then the simulation model of the electric cylinder steering system in MATLAB/Simulink was established to simulate the dynamic performance of the electric cylinder steering system. Thereafter, according to the actual working conditions of the ART, the dynamic performance test bench of the electric cylinder steering system was built and used to test the dynamic performance of the electric cylinder steering system. Finally, the simulation data and the test data were compared. The comparative analysis showed that the simulation results were in good agreement with the test results, which proved that the mathematical model was accurate and also verified the feasibility of replacing the hydraulic cylinder steering system with the electric cylinder steering system.关键词：autonomous rail rapid transit;steering servo control;electric cylinder;dynamic performance system modeling;simulation;testing
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发布时间：2021-12-09 - 摘要：Aiming at the problem of mechanical property test for articulated device, the structural principle of articulated devices of rotation, fixed and free was briefly analyzed, and three kinds of new component test schemes, i.e. rotation "vertical + yaw", fixed hinge "vertical + torsional" and free hinged device as a whole, were designed and compared with the traditional ones. With the component test program, the fatigue and ultimate performance of the hinge device was studied. The results showed that the design of the three new articulated devices test scheme was reasonable, and the test conditions were consistent with the vehicle operation conditions. The component test could accurately reflect the mechanical properties, fatigue and ultimate performance of the articulated device which could fulfill the requirements. The test results were basically consistent with the analysis results.关键词：low floor car;articulated device;experimental research;simulation;urban rail vehicle
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发布时间：2021-12-09
Test & Detection
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