最新刊期
期 4 ， 2021
- 摘要：The Lanzhou-Xinjiang passenger dedicated Line is located in the northwest region of China with the natural environment of high temperature, severe cold and windy sand, which puts forward higher requirements for the safe and reliable operation of high-speed EMUs. When the running speed was 200 km/h, the EMUs operated in good condition. After the speed was increased to 250 km/h, the dynamic indicators such as the frame lateral acceleration and lateral ride index would significantly be increased, and be close to the limit values in some conditions. From the perspective of wheel wear, actual wheel-rail matching relationship and application environment, simulation analysis and vibration test were used to find the cause of the deterioration of vehicle dynamic performance. the lateral stability was improved by improving the rail profile, optimizing suspension parameters, and adjusting operation routes, the vehicle dynamic problems were solved well after the EMUs speed increase.关键词：EMU;wheel wear;rail profile;dynamic;lateral stability;wheel-rail match;simulation;high-speed railway
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发布时间：2021-12-09 - 摘要：By using the rubber constitutive equation named Mooney-Rivlin model, the load-bearing performance of the traction rubber pile for the bogie was analyzed by LS-Dyna, and the "force-displacement" curve(that is, three-way stiffness of rubber piles),were obtained on longitudinal, transverse and vertical loads. The calculation results are in good agreement with the test, and the relative errors are about 10%, which verifies the accuracy of the simulation method. By comparing the influence of different hardness on the stability of rubber pile under longitudinal displacement, the critical longitudinal displacement of the traction rubber pile is 35.2 mm when the hardness is 48 HA, and the longitudinal bearing capacity is the best when the hardness is 46 HA. Assembly directions also have great influence on its forms of instability. The installing form which use short side in parallel with clamping long side is suggested for traction rubber pile.关键词：bogie;rubber pile;three-way stiffness;hardness;installed direction;critical instability value;FE;simulation
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发布时间：2021-12-09 - 摘要：To research the small radius curve negotiation of the tram, the motion equation of a free wheelset passing through curve was firstly derived. In theoretically, the influence of the wheel-rail contact friction coefficient, the gauge distance and the curve radius on the curve passing performance was clarified. Taking the five-module low-floor tram as an example, a dynamic simulation model was established, and the accuracy of the model was verified by a field test. Finally, the variation of small radius curve negotiation of the tram was analyzed from the perspectives of wheel-rail lubrication, gauge widening and curve radius. The research results show that the wheel-rail lubrication has a significant influence on the curve passing performance of the tram and the safety index can be improved obviously. Besides, the gauge widening has a certain influence on the small radius curve negotiation of the tram, and there is a reasonable range of values. Curve radius has obvious implications for curve negotiation. With the increase of the curve radius, the safety coefficient decreases obviously. The increase of the curve radius can not only reduce the safety indicators of the tram, but also improve the passing speed of the curve.关键词：tram;small radius curve;curve negotiation;operational safety
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发布时间：2021-12-09 - 摘要：In order to solve the problem that the reconnection of CRH6F-A/CRH6A-A short intercity EMU can not meet the requirements of the length of neutral section of domestic lines, the reconnection control method of short intercity EMU was studied,and the reconnection control strategy of single pantograph passing neutral section was put forward. A kind of valve plate used for quick putting down pantograph was designed, and the performance of the lifting and dropping pantograph under different speed grades was tested through experiments, which included the signal response speed, the time and distance of lifting and dropping pantograph, and the arcing performance of the pantograph. The test results show that the single pantograph passing neutral section control technology is feasible and the arc-ignition rate of pantograph-catenary system is low when the pantograph-catenary system is lifting and dropping dynamically, and the impact on the pantograph-catenary is small. The research overcame the bottleneck of the length limitation of the neutral section in the multiple operation of the short marshalling EMU, realized the flexible operation of the short marshalling EMU,and effectively relieved the passenger pressure in the peak period of passenger flow.关键词：short marshalling;EMU;reconnection;passing neutral section;high-speed railway
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发布时间：2021-12-09 - 摘要：In order to study the effect of wheel flat on the wheel-rail contact creep characteristics of high-speed trains, based on the multibody dynamics theory and rolling contact simplification theory, a rigid- flexible coupling dynamic model considering the flexibility of the wheelset was established. The influence of wheel flat parameters on the characteristics of high-speed train wheel-rail force and creep force was analyzed, and the safety limit of wheel flat length was obtained by combining the wheel load reduction rate and the wheel-rail vertical force index. The results showed that: by considering the flexibility of the wheelset, the contact state of the wheel and rail can be better reflected; during the rolling contact of the wheel and rail, the overlong flat of the wheel would cause the wheelset to jump and lead to derail when it was serious, so the wheelset should be timely repaired according to the limit value of flat length. Combined with wheel load reduction rate and wheel rail vertical force, the safety limit of wheel flat length was 27 mm, which could more effectively guarantee the safe operation of high-speed trains.关键词：high speed train;rigid and flexible coupling;wheel flat;wheel/rail contact;creep force
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发布时间：2021-12-09 - 摘要：In order to improve the calculation accuracy of the vibration response of vehicle system, based on the rigid flexible coupling dynamics theory, the wheelset, frame and track were considered as flexible bodies, and the vehicle track coupling dynamics model considering multiple flexible bodies was established. The vibration characteristics of the dynamic interaction between wheel and rail were compared and analyzed, and the dynamic performance of wheel-rail contact and smooth-running performance under multiple flexible factors were studied. The results show that the vibration acceleration of the wheel varies greatly in the vertical direction and the transverse motion of the flexible parts is "misplaced" under the condition of multi-flexibility. The dynamic parameters are also changed. The acceleration of the car body increases by 36.7% in the vertical direction, while it has a certain relation with the line radius in the transverse direction. The transverse Sperling index decreases by 9.5%, while the vertical Sperling index increases by 16.6% under the multi-flexibility factors.关键词：multi-flexible factor;flexible wheelset;flexible track;rigid-flexible coupling dynamics;hig-speed train;rail;FEA
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发布时间：2021-12-09 - 摘要：There are two typical forms of hunting motions in vehicle systems, i.e., primary and secondary hunting motions, also called vehicle and bogie hunting motions. When primary hunting occurs, the vehicle body shakes intensely from left to right, which affects the stability of the vehicle and the comfort of passengers. By using the SIMPACK software to set up the 300 km/h nonlinear dynamic model, the vehicle hunting instability was simulated. Combined with the principle of frequency capture in nonlinear vibration systems, it was found that primary hunting motions was caused by the hunting frequency of the bogie being captured by the vehicle's hunting frequency. By changing the primary suspension stiffness, the bogie's hunting frequency was changed at the same operating speed, avoiding the frequency capture zone of the vehicle, effectively suppressing the vehicle hunting motion and improving the vehicle stability.关键词：high-speed EMUs;vehicle hunting motion;frequency capture;primary suspension stiffness;nonlinear dynamic mode
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发布时间：2021-12-09 - 摘要：In order to promote the development of the low-floor light rail vehicles (LRVs) and expand the scope of the independently rotating wheelsets (IRW), development status of IRWs steering and application trend of permanent magnet synchronous direct-driven motor (PMSM) in LRVs were reviewed. Steering is the main problem that limits the application of IRW, and the main steering strategies include rotating coupling method and active control method through the analysis of the steering principle. At present, the wheel rotational speed coupling method is widely used, such as Alstom’s lateral coupling and Siemens’ longitudinal coupling. The active control steering is the development trend of independent wheelset steering, which can obtain better steering ability. At present, there are speed control methods that are used in Adtranz vehicle. In the active control steering, the speed control does not need additional actuator, which is easier to realize, but at the same time, the layout and selection of the motor should be considered comprehensively. Because of the lack of deceleration link, it is easy to realize low-speed and high torque operation. The speed control is realized by PMSM, which has become one of the future development directions of LRV.关键词：low-floor rail vehicle;urban rail transit;independently rotating wheelsets;steering control;PMSM;direct drive wheel
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发布时间：2021-12-09 - 摘要：In order to meet the development needs of China's railway transportation, the technical improvement of HXD2 eight-axle freight electric locomotive was mainly based on independent design, and re-innovative design was carried out on the basis of the development and application of existing HXD2 electric locomotive. Relying on the latest technical achievements in locomotive standard system and simplification in recent years, general technical improvements were made on the locomotive in terms of heavy load adaptability, simplification and interconnection, reliability, technical upgrade and adaptability to the reform of repair schedule and repair system, so as to further optimized the performance of HXD2 eight-axle freight electric locomotive. Through the implementation of the project, the technical improvement of eight-axle freight electric locomotive was realized, and the existing technology upgrade and localization improvement of AC drive locomotive were realized too.关键词：HXD2;electric locomotive;eight axis;freight transport;technology upgrading;heavy-haul railway;simulation
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发布时间：2021-12-09 - 摘要：To meet the requirements of TSI (Technical Specification for Interoperability)to freight electric locomotive, design of integral bearing and lightweight structure was adopted, and the structure of underframe and other components was optimized. The strength and crashworthiness were simulated by FEA software. Static load test for vehicle body structure were also conducted to demonstrate the conformity of strength requirements. The vehicle body structure and its accessories had passed the TSI certification and maintained safe operation since 2019.关键词：electric locomotive;vehicle body;TSI;crashworthiness;underframe;lightweight
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发布时间：2021-12-09
Railway Rolling Stock
- 摘要：In order to meet the application of multiple power supply systems and have the functions of battery traction, the range extend multi-current traction system based on battery energy storage was developed. The design idea of the traction system was expounded. The system design parameters, topology and main circuit and working principle of key components such as traction converter and bidirectional charger were introduced in detail. Some key technologies used in the system were analyzed and studied. The results of system combination test and loading show that the traction and braking characteristics of the traction system under different power supply systems and the charging and discharging performance of bidirectional charger all meet the design requirements.关键词：energy storage range extend;multi-current;battery;bidirectional charger;traction system
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发布时间：2021-12-09 - 摘要：In the ETB/ECN train communication network, when the train coupling or de-coupling, the train-level IP address of its equipment will change with the ETB attribute and coupling direction of vehicles. The network technician needs to use the ETB inauguration result to calculate the train-level IP address, which will reduce the development efficiency. An addressing scheme based on URI domain names was proposed. Compared with commonly used IP addressing, the URI address of a device was determined by its train location, vehicle location and device function, which did not change with the train topology. After the source device interacted with the domain name server through the static URI address, the train-level IP address of the destination device was obtained to complete the ETB communication. URI addressing reduced the complexity of dynamic IP addressing in the network system design process, and solved the problem that WTB/MVB networks could not maintain the entire train at a single point, which improved the efficiency of network development and maintenance.关键词：ETB inauguration;train communication;train-level IP Address;URI Address;domain name system;Ethernet;high-speed EMU
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发布时间：2021-12-09 - 摘要：In order to comprehensively control the power quality in the traction power supply system, based on the power compensation vector diagram, the power relationship between the left and right power supply sections of the V/v traction transformer was analyzed. Taking the modular multi-level railway power regulator (MMC-RPC) as research object, the power quality problems such as negative sequence and harmonic in the traction power supply system were comprehensively solved by active power balance,reactive power compensation and harmonic power reverse injection. In order to improve the robustness of the internal and external disturbances during normal operation of the system, the MMC-RPC was controlled by the nonlinear control method of the Lyapunov function, and the basis of constant power and constant voltage was used in the outer loop. In the upper and inner loops, the nonlinear control strategy based on Lyapunov function was adopted. From the perspective of inner loop stability, the optimal control parameters were selected to ensure that the system could still operate stably and reliably when the line parameters on the power supply arm were perturbed or load switching. The MMC-RPC simulation system was built with Matlab/simulink to simulate the dynamic adjustment and anti-disturbance capability of the control system with the traction network load mutation and line parameter perturbation.Compared with the traditional double closed-loop PI control strategy, the control strategy is more feasible and effective.关键词：modular multilevel converter;railway power regulator;Lyapunov function;stability;double closed loop PI control
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发布时间：2021-12-09 - 摘要：In order to investigate the vibration characteristics of traction transformer for high-speed EMU under the electromechanics coupling effect, the vibration mechanisms of core and windings of the traction transformer were analyzed. Based on the field vibration test of high-speed EMU, the vibration acceleration amplitude and frequency distribution of traction transformer were studied, considering stopping, acceleration, constant speed and passing through the neutral zone. Besides, the influence of cooling fan and the effect of traction transformer on car body and riding quality were investigated. Research results show that when the traction transformer is working normally, the vibration energy is mainly concentrated in 200 Hz and 300 Hz. The vibration energy caused by the car body and the cooling fan is a relatively small percentage. These conclusions are consistent with the theoretical analysis results. During passing through the neutral zone, lateral acceleration RMS of traction transformer is only 7% of lateral acceleration RMS during the operation of traction transformer. In the frequency domain, there are the vibration components of 24.6 Hz and second harmonic generation in vertical acceleration of traction transformer caused by cooling fan. The acceleration values of the car body underframe which is affected by traction transformer increases by 20%, which deteriorates the vehicle running stability.关键词：vehicle engineering;high-speed EMU;traction transformer;vibration characteristics;field test
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发布时间：2021-12-09 - 摘要：In order to meet the increasing demand for data transmission, ensure the reliability and real-time of data transmission, and improve the flexibility and interconnectivity of the train network, a train network control system coexisting with bus and exchange network was designed. The advantages of the two networks were complementary, and the network form could be automatically selected according to the actual situation of the train network and the fault oriented safety principle. A laboratory simulation test platform was built, and the MVB/WTB communication, TRDP communication, the conversion between the two kinds of communication and the train control logic were tested, and the 400 km/h cross-country interconnectivity EMU project verification had been passed. The test results show that the designed network system has excellent performance and can provide important support for the train network control system with more diversified data and more efficient transmission performance.关键词：EMU;train network;bus type;switching type;interconnectivity;Ethernet;MVB/WTB communication;TRDP communication
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发布时间：2021-12-09
Electric Traction and Control
- 摘要：In the main circuit of traction converter, due to the using of multiple four quadrant parallel power supply, the middle DC link can not fully realize low inductance connection and introduce line stray inductances, which leads to the resonance between multiple branch capacitors and the increase of capacitive current. In this paper, by building the equivalent simulation model of the main circuit of traction converter, combined with the double parallel main circuit structure of adding line stray parameters in the middle DC link, the main circuit transfer function of introducing line stray inductance into the middle DC link was derived. According to the amplitude frequency characteristics of the transfer function, the stray inductance will make the main circuit have a higher order resonance point besides the secondary resonance point, and the larger the stray inductance is, the larger the resonance gain is, resulting in the increase of the support capacitance current.关键词：EMU;stray inductance;DC-side capacitive current;transfer function;high-order resonance point;converter;simulation
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发布时间：2021-12-09
High-power Devices
- 摘要：Improving the on-line detection level of pantograph-catenary system and evaluating its service status has become a key problem to be solved in the construction of intelligent operation and maintenance of heavy-haul locomotive. Based on the introduction of the current situation of pantograph catenary system detection in service, the detection requirements, detection objects and technical challenges of pantograph catenary system were analyzed and summarized. Through the integrated research of pantograph catenary detection system and the comprehensive application of vehicle network, internet of things, cloud computing, image recognition and machine vision algorithm, an on-board pantograph catenary detection system suitable for heavy-duty locomotive with the functions of catenary state inspection, pantograph dynamic operation parameter detection and pantograph catenary dynamic interaction relationship detection was proposed. The test showed that the systems can realize on-line detection, fault diagnosis, intelligent prediction,emergency treatment and pantograph health management of pantograph-catenary system, improve the online detection and evaluation effect of pantograph-catenary system, and ensure the safety and reliability of line traction power supply.关键词：heavy haul railways;intelligent operation and maintenance;pantograph-catenary system;detection;integration research;health management;fault diagnosis
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发布时间：2021-12-09 - 摘要：Aiming at the problems of high-labor intensity and difficult operation of freight locomotive, a scenario-specific objective curve planning method was proposed, and the proportional-integral-differential (PID) control algorithm of expert system was designed to follow and optimize iteratively the objective curve in real time. The automatic train operation (ATO) function of freight locomotive was realized. The key and difficult control scenarios in the experiment were verified, and the results show that the control method is safe and effective.关键词：automatic train operation;operation scenario;PID control algorithm;freight locomotive;simulation
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发布时间：2021-12-09 - 摘要：In view of the problems of dynamic model mismatch of traditional controller and potential safety hazards of driver operation when the high-speed train operated in a changeable and complex environment, a high speed train automatic driving controller design scheme based on model-free adaptive control (MFAC) was proposed. Firstly, a full-format dynamic data train model to transfer the nonlinear characteristics of the train to the pseudo gradient was constructed; Secondly, according to the full-format dynamic data train model,the model-free adaptive control law and the train control principle were designed, and with the pseudo gradient estimated through the train operation data, the ATO controller was constructed; Finally, "Lanzhouxi-Xining" EMU operating data was used for simulation. The result shows that: speed tracking error under the action of the MFAC controller is 0.254 km/h, and the train acceleration impact rate is mainly distributed in [0, 0.1), accounting for about 83.8% of the total step length. By compared with fuzzy adaptive PID (proportion-integral-derivative)in terms of speed tracking, displacement tracking, and comfort, the performance of the proposed controller is proved better.关键词：high speed train;model-free adaptive;automatic train operation;full-format dynamic linearization;simulation
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发布时间：2021-12-09 - 摘要：The traction motor plays a key role in the EMU train’s power transmission system. The most frequent fault of traction motor is grounding fault. By using RBF neural network, decision tree and support vector machine (SVM) respectively, the traction motor’s electrical fault prediction model was built based on the historical data of the traction motor control unit. It shows that the prediction accuracy of the three algorithms is higher than 84% at all. And comparing with RBF neural network and support vector machine, decision tree has higher prediction accuracy and reaches 85.6%. Therefore, the decision tree was selected to predict the occurrence of grounding fault.关键词：EMU;traction motor;high-speed railway;grounding fault prediction;decision tree;RBF neural network;SVM;fault diagnosis
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发布时间：2021-12-09
Intelligent Technology
- 摘要：The traditional fault location system of railway traction system is mostly based on the impedance calculation principle,which is greatly affected by the line parameters. The problem can be avoided by using traveling wave ranging principle. A fault location system of traction power supply line based on the principle of non-contact traveling wave location was designed. The system could reverse the catenary fault voltage through measuring the electric field below the catenary with non-contact electric field sensor,the system had the advantages of wide frequency band, non-contact measurement, convenient installation and maintenance. The wavelet method based on modulus maxima was used to analyze the fault waveform to realize the fault location of traction network.In addition, the accuracy of wavelet function and decomposition layers for fault location was analyzed. Taking the short-circuit test of Shuohuang railway Shuo-Xi line as an example, the test waveforms were obtained by the noncontact fault location system, and the transient traveling wave velocity was calculated based on the electrical conditions of the catenary. It was shown that the measurement error was less than 500 m, which verified the effectiveness of the non-contact fault location system.关键词：fault location;traction power supply system;non-contact;wavelet analysis;heavy-haul railway;catenary
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发布时间：2021-12-09
Railway Electrification
- 摘要：Aiming at the local defects of traction motor stator insulation, based on the partial discharge pulse current method, a scheme for evaluating the reliability of traction motor stator insulation was proposed. First, discharge models were established based on the four types of electrical discharges in the stator insulation of the motor. The phase spectra and discharge pulses of different types of discharge were obtained through the partial discharge test of the discharge model, and the typical discharge phase spectra and pulse characteristics were analyzed. Then the characteristic sequence of the phase spectrogram was extracted, the BP neural network was used to classify the discharge types, and the stator insulation safety level was divided according to the magnitude of the discharge amplitude, and then the stator insulation evaluation plan was proposed. Finally, a partial discharge test platform was built, and the partial discharge test was carried out on the stator insulation of the traction motor test prototype. The stator insulation reliability evaluation program proposed in the article can effectively evaluate the partial discharge defect type and discharge intensity of the stator insulation of the motor, and has a certain versatility and guiding significance for the analysis of the insulation status of the motor.关键词：traction motor;stator insulation;partial discharge;feature extraction;pattern recognition;fault diagnosis;high-speed train
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发布时间：2021-12-09 - 摘要：Aiming at the crosstalk of transmission lines in electrical and electronic systems, the influences of cable type,interval distance, cable length and the height of the transmission line from the ground on crosstalk coupling of transmission line were calculated by using transmission line matrix (TLM) method, and the reasonable method to reduce cable crosstalk was discussed. The research results show that the cable crosstalk effect decreases with the increase of the cable interval distance, however, the degree of crosstalk cannot be reduced effectively by increasing the interval distance when the distance increases to 10 cm; the degree of crosstalk increases with the increase of the height of the transmission line from the ground and the length of the transmission line, which increases linearly with the increase of the height of the transmission line from the ground; and changes periodically with the change of the signal frequency, the change frequency of which is about the corresponding frequency value when the electromagnetic wave wavelength is twice the cable length, and the maximum crosstalk voltage appears near the integer multiple of the frequency value;compared with increasing the interval distance, choosing the cable with shielding layer is the key to reduce the crosstalk effect; the crosstalk voltage can be reduced to 0.02 V by the coaxial line which has the optimal anti-interference performance.关键词：multiconductor transmission lines;numerical calculation;transmission line equation;crosstalk;electromagnetic coupling;simulation
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发布时间：2021-12-09
Reliability Engineering
- 摘要：Based on the comparative analysis of acceleration method and electric power method in traction characteristic curve test, a new method combining acceleration method and electric power method was proposed to measure traction characteristic curve of urban rail transit vehicles, that is, acceleration method was adopted in constant torque area, and improved electric power method was adopted in constant power area and natural characteristic area. The test showed this method combine the advantages of acceleration method and electric power method, and could effectively improve the test accuracy.关键词：urban rail transit;traction characteristics;tractive effort at wheel rim;acceleration;electric power
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发布时间：2021-12-09
Detection Technology
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