最新刊期
期 1 ， 2020
- 摘要：The core of the development of high-power converter technology lies in power semiconductor technology. The iterative optimization of traditional silicon-based power semiconductor devices and the gradually maturity of new wide-band gap material semiconductor devices continue to contribute to the development of the rail transit industry. Base on the power semiconductor chip technology, this paper systematically studied on the latest developments in the module packaging, components integration, heat dissipation, electromagnetic compatibility and so on. The continuous research on power semiconductor converter technology is the key to promote traction equipment of rail transit towards higher power density, higher efficiency, higher reliability, etc.关键词：converter technology;power semiconductor;rail transit;chip technology;module packaging;heat dissipation;electromagnetic compatibility
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发布时间：2021-12-10 - 摘要：Rail transport IGBT module lifetime prediction technology has become research focuses due to China's rail transit vehicles entering the stage of overhaul, thus scientific module lifetime prediction method is the key to realize the IGBT converter life cycle management. Based on rail transit applications, the failure mechanism, lifetime prediction model and process of IGBT module were introduced, and the challenges by collect relevant research results both at home and abroad were summarized, then it was proposed that IGBT intelligent drive, big data analysis and artificial intelligence, condition monitor and other technologies could improve the accuracy of IGBT module lifetime prediction.关键词：railway transit;IGBT module;lifetime prediction;simulation
- 483
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- 17
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发布时间：2021-12-10 - 摘要：Aiming at the problem of explosion damage of IGBT module used in locomotive after application failure, which makes it difficult to find the failure reason. The switch state of IGBT module under the application condition was analyzed, and five failure modes were put forward. Based on the statistical distribution of failure modes in the factory and in the field of application, the causes of five failure modes and early failures as well as the failures caused in the application process were analyzed. Finally, the design improvement suggestions were put forward from the application and device dimensions.关键词：locomotive;IGBT;switch state;failure mode
- 434
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- 20
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发布时间：2021-12-10 - 摘要：Thermal grease is used to reduce the contact resistance of the contact interface between the IGBT module and the heatsink in the field of rail transit. Because of the frequent vibration and the cyclic temperature fluctuation of the IGBT module, the thermal grease could volatilize, flow out, and even dry up, which could cause an air gap between the module and the heatsink, heat transfer conditions was worsen. The effect of the air gap on the temperature of the IGBT junction and the shell has been studied based on numerical simulation and experiment. The results showed that the air gap has less influence on the junction temperature in the intial stage, with the expansion of the air gap, the junction temperature increase obviously and lead to the declining of the life of the IGBT module, and even IGBT module rapidly damage.关键词：IGBT module;heatsink;air gap;case temperature of IGBT;junction temperature of IGBT
- 445
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- 15
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发布时间：2021-12-10 - 摘要：Based on the numerical simulation and experimental research methods, the performance of the liquid cooled radiator used in the rail transit converter was studied and optimized, and the results were compared with the current radiator used in HXD1C and HXD2B locomotives. The results showed that the heat transfer capacity and the flow resistance of the radiator were improved by using the high-efficiency turbulence technology and four parallel channel structures, the temperature rise of the radiator table was 37%and 14.1% lower than that of HXD2B and HXD1C in use, and the flow resistance was 36.9% and 22.3% lower respectively. By using symmetrical double-sided cooling structure, the temperature homogeneity of IGBT installation surface was improved, and the occupied space was 26% less than that of single-sided tiling installation.关键词：turbulator;IGBT;double-sided cooling radiator;temperature raising;flow resistance;temperature homogeneity;numerical simulation
- 582
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- 10
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发布时间：2021-12-10 - 摘要：The switching characteristics and energy consumption of SiC devices and Si devices were compared; the power losses of SiC devices and Si devices were compared according to the calculation of traction conditions of rail transit; for the application of high switching frequency, a series of tests including temperature rise, noise, power loss and efficiency were carried out. The test results showd that the traction inverter with SiC MOSFET can effectively reduce the harmonic loss of the motor, realize the energy saving and consumption reduction of the traction system, and reduce the motor noise in the middle and low speed sections.关键词：SiC MOSFET;inverter;power loss;noise;efficiency
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- 14
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发布时间：2021-12-10 - 摘要：Depending on the advantages of SiC MOSFET with faster switching and lower on-state losses, the switching characteristics of a 3 300 V full SiC MOSFET device were studied to make better use of the device. Firstly, the switching processes of the SiC device were illustrated in theory, and the quantifiable method was provided; secondly, the effects of gate drive resistors, junction temperature and stray inductance on switching characteristics were investigated; finally, a prototype test was carried out. The results indicated that the switching characteristics optimizing method as discussed can provide application guidance to the full SiC invertors.关键词：3 300 V full SiC MOSFET;switching characteristics;gate drive resistors;junction temperature;stray inductance
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- 6
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发布时间：2021-12-10 - 摘要：In order to solve the lightweight problems of rail traffic traction and auxiliary systems, the applications of wide-bandgap semiconductor devices such as silicon carbide devices are increasing rapidly. Silicon carbide has the characteristics of wide-bandgap, high breakdown voltage and high electron saturation velocity, which can meet the requirements of power electronic device applied under high power, high temperature and high frequency conditions. The outstanding advantages of silicon carbide devices over traditional silicon-based devices were briefly introduced, as well as the current status of commercialization and laboratory development of silicon carbide devices. The applications of silicon carbide devices in rail transit were described, suggestions and prospects for the using of silicon carbide devices in converters in the future were also provided.关键词：silicon carbide;wide-bandgap semiconductor;traction systems;auxiliary power supply systems;rail transit
- 387
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- 13
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发布时间：2021-12-10 - 摘要：SiC materials have excellent properties such as large forbidden band width, high critical electric field, high carrier saturation drift speed and high thermal conductivity, making them widely used in high temperature, high voltage, high power and other fields. In order to investigate the influence of temperature on the static characteristics of 4H-SiC MOSFET to guide the design and manufacture of 4H-SiC MOSFET in high temperature and high voltage environment, a high-voltage 4H-SiC MOSFET device was simulated and modeled based on the Silvaco platform, and the breakdown voltage, transfer characteristics and output characteristics at different temperatures were obtained. The influence of temperature on its breakdown voltage, threshold voltage, saturated current and on-resistance was investigated. The cell structure model of SiC MOSFET device with a breakdown voltage of 4 450 V at 300 K was obtained. It was verified that the static characteristics and parameters were affected by temperature. The influence law was consistent with the static characteristic theory of SiC MOSFET.关键词：4H-SiC MOSFET;silicon carbide;static characteristics;temperature characteristics;device simulation
- 460
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- 8
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发布时间：2021-12-10 - 摘要：Based on Matlab and Simulink, a modeling method for non-linear devices was proposed. Taking the SiC MOSFET of CREE company C2M0080120D as an example, the equivalent circuit model of its nonlinear capacitance CGD was established. By using the curve fitting method, the non-linear capacitance characteristics of power devices which are not easy to realize in Simulink can be characterized. Compared with datasheet, the accuracy of the model was 97.44%. The accuracy of the model was validated.关键词：MATLAB;Simulink;SiC MOSFET;non-linear device;equivalent circuit model;curve fitting;simulation model;modeling
- 831
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发布时间：2021-12-10
Power Semiconductor Technology
- 摘要：This paper introduced how to realize the man-machine interaction interface of the automatic driving system of the domestic HXD1 locomotive, so as to achieve the purpose of communication between the automatic driving system and the driver. The specific implementation method of automatic driving information display was presented. Different contents were displayed according to the function division area. By displaying color collocation and voice technology interacting with the driver, the man-machine interaction obstacles in the operation of the automatic driving system were eliminated, and the smooth and safety operation of the train was ensured.关键词：automatic train operation system;man-machine interaction;display technology;HXD1 locomotive
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- 14
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发布时间：2021-12-10 - 摘要：In order to ensure the stability of automatic train operation, the longitudinal impact force of multiple mass points should be fully considered. This paper studied relevant contents of the longitudinal dynamics of heavy-duty train, including the modeling and simulation technology of multi-point model, air brake model and coupler buffer model, and developed the longitudinal dynamics simulation software for automatic driving. Compared with the actual operation, the test results show that the developed longitudinal dynamics software of heavy-duty train can accurately simulate the actual operation conditions of the train, which has an important guiding value for the automatic driving and smooth operation of heavy-duty train.关键词：heavy train;automatic driving;longitudinal dynamics;simulation software;modeling
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发布时间：2021-12-10 - 摘要：The guiding thought under the fault safety was expounded, through qualitative analysis, the fault safety was controlled in different levels. For the first time, the guidance safety strategy was divided into SOL 1-4 levels. It was analysed that how to hand over the control taking over right to the driver in case of fault. Carry out necessary and correct guidance safety protection control in view of various faults of locomotives, according to the content and state of the fault, and guide the train to manually take over, slow down or stop. The test shows that HXD1 locomotive automatic train driving system achieves the purpose of the safety and smooth operation of the train.关键词：HXD1 locomotive;automatic train operation system;failure oriented safety;safety level;control under levels
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发布时间：2021-12-10 - 摘要：This paper mainly introduced the design and application of the automatic driving system of the HXD1 type AC drive electric locomotive. Based on the principle of minimizing locomotive alteration and cost, the automatic driving function can be realized by installing automatic driving system equipment, communication and power supply cable. Through the successful application of the locomotive automatic system, the manual labor intensity was reduced, the human error factors were eliminated, and the locomotive operation level and consistency were improved.关键词：HXD1 locomotive;automatic train operation system;freight train
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- 8
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发布时间：2021-12-10 - 摘要：Due to the limitation of railway basic equipment technology and domestic complex operating environment, locomotive automatic train operation still needs to work on duty. Therefore, there should be a perfect automatic driving system mode switching strategy to define the right of the on-duty personnel and the automatic driving. Based on the principle of locomotive operation safety and longitudinal dynamic analysis of train stability during dynamic switching, the mode switching strategy of locomotive autopilot system was expounded. The strategy had been applied to the practical application of locomotive automatic driving, and it was proved by a lot of practical cases that the automatic driving mode switching strategy of the locomotive could effectively ensure the safe and stable operation of the train during the switching of the locomotive control mode, and had a good running effect.关键词：HXD1 electric locomotive;manual driving;automatic train operation system;application strategy;mode switching strategy
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发布时间：2021-12-10
Locomotive Automatic Operation Technology
- 摘要：When the maglev train runs at medium and high speed based on the long stator linear synchronous motor (LSLSM), the position information of the motor can’ t be accurately obtained by the traditional on-board position sensor, and the position information is susceptible to interference. A position identification method based on sliding mode observer was proposed. Based on the analysis of the sensitivity of stator resistance, d-axis inductance and q-axis inductance of sliding mode observer, a position identification method of LSLSM based on q-axis inductance correction was provided, which could improve the position observation accuracy and system reliability. The correctness of the proposed method was verified by digital simulation and magnetic levitation test line.关键词：high-speed maglev;LSLSM;sliding mode observer;position identification;stator flux;simulation
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发布时间：2021-12-10 - 摘要：With the consideration of the traction power supply characteristics of Chinese electric railways, according to the features of power supply design and operation, the demand for reliability data acquisitions and the calculation methods of reliability indexes were studied from two aspects of the power supply services and the power supply facilities. Because of the big data technology involved in massive data statistical analysis, a SQL database had been built, and the reliability statistical analysis software of the traction power supply system based on B/S structure was established. The analysis software shared the information fully with the management information system and the dispatch system, then the software formd a basic data collection and reliability evaluation system for the traction power supply system in China, which can serve as the basis for the operation and maintenance department to implement management.关键词：electric railways;traction power supply system;reliability;quantitative assessment;evaluating indicator;big data technology;B/S architecture;high-speed railway
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- 4
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发布时间：2021-12-10 - 摘要：In order to deal with the negative sequence, reactive power, harmonic and other power quality problems of traction power supply system, the power relationship between the left and right power supply arms of V/v transformer was analyzed, and the power quality problems were comprehensively dealt with by means of transferring active power, compensating reactive power and separating harmonic power. At the same time, the differential flatness control theory was introduced on the basis of quasi proportional resonance control for MMC-RPC. Based on differential flatness control theory, the active current and reactive current were selected as the output of the system in the dynamic mathematical model of MMC-RPC power supply arm, so as to meet the conditions of differential flatness control system. Lyapunov stability analysis of differential flatness system was carried out, and differential flatness controller was designed by using proportional integral and Quasi-R parallel control. The simulation system was built with Matlab /Simulink software to simulate several different operating conditions, and compared with other control methods. The results verified the effectiveness and superiority of the control strategy.关键词：modular multilevel converter;railway power regulator;differential flatness theory;proportional integral controller;quasi-proportional resonance control;simulation
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发布时间：2021-12-10 - 摘要：Train power cabinet (TPC) of a new generation Fuxing power centralized EMUs used two-level PWM rectifier to supply DC 600 V for passenger cars. Because of series EMI filter at the front of load, when the load is put into operation, the filter inductance and EMI capacitance of the power supply cabinet will oscillate, resulting in the output voltage oscillation. In order to suppress the output voltage oscillation, two schemes of output parallel RC absorption circuit and filter inductor parallel RC were discussed and verified respectively. Through the analysis of the main circuit structure, the solution of filter inductor parallel absorption resistance was provided. Finally, the feasibility and effectiveness of the proposed scheme were verified by simulation and experiment.关键词：DC 600 V;train power cabinet;PWM rectifier;voltage oscillation;absorption resistance;EMUs;simulation
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- 9
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发布时间：2021-12-10 - 摘要：Aiming at the difficulty in extracting early fault features of high-speed train gearbox rolling bearings, bearings fault diagnosis method based on empirical wavelet transform (EWT) and singular value decomposition (SVD) was proposed. Firstly, EWT was used to decompose the vibration signal into intrinsic modal components. Then the kurtosis of the intrinsic modal components was calculated and some of the intrinsic modal components were selected by the rule of kurtosis. The hankel matrix, which was constructed with the intrinsic modal components, was orthogonally executed through SVD. At last, the Hilbert envelope demodulation was adopted with the new signal to detect the fault information. Through analyzing the simulation signal and the outer vibration signal of fault rolling bearing respectively, the characteristics frequency could be clearly extracted. The results indicated that the diagnosis method of EWT and kurtosis coefficient and SVD could accurately and quickly extract the bearings fault information, so the rolling bearings can be diagnosed effectively.关键词：empirical wavelet transform (EWT);high-speed train;rolling bearing;fault diagnosis;kurtosis coefficient;singular value decomposition (SVD);simulation
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发布时间：2021-12-10 - 摘要：Extracting impact features from a fault vibration signal of high-speed train bearing is significant to some fault diagnoses. Based on the fact that wavelet-total variation (WATV) algorithm is capable of inducing sparsity, an effective impact feature extracting method with WATV was proposed. In this algorithm, the objective optimization function was constructed for the extraction of noisy impact features, which combined the fidelity measurement operator and penalty factor of impact features. The convex optimization theory could be used to solve the objective function, so as to enhance the signal sparsity in wavelet domain and time domain, and optimize the feature extraction results. The validity of WATV algorithm was verified by constructing a simulation signal, and the method was applied in the fault diagnosis of gearbox bearing of high-speed train. The results showed that the method could extract the impact feature of signal well, and the fault representation in spectrum was obvious, which could be effectively applied in the fault diagnosis of high-speed train bearing.关键词：vibration signal analysis;convex optimization problem;feature extraction;sparse representation;bearing;fault diagnosis;high-speed train
- 518
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- 7
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发布时间：2021-12-10 - 摘要：Anti roll decoupling mechanism is the key component of mid-low speed maglev vehicle bogies. According to the structural characteristics of maglev vehicle bogies, a new cross anti-roll decoupling mechanism was proposed, and dynamic simulation analysis was carried out based on virtual prototyping technology. The simulation results show that the anti-roll decoupling mechanism not only has simple structure, but also has better performance than the traditional anti-roll decoupling mechanism, which is fully applicable to the requirements of maglev vehicle, and solves the coupling and restriction problems between anti-roll and decoupling.关键词：mid-low speed maglev vehicle;maglev bogies;anti-roll decoupling mechanism;virtual prototype;modeling;simulation
- 547
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- 2
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发布时间：2021-12-10 - 摘要：The CKD6E6000 locomotive was designed with platform technology. The design and main technical parameters of CKD6E6000 hybrid shunting locomotive were introduced. The control strategies of the locomotive in different modes were described. The test and application results showed that the locomotive traction performance met the requirements with friend working environment and obvious effect of fuel saving and emission reduction, which has a good application prospect.关键词：CKD6E6000;hybrid power;shunting locomotive;locomotive design
- 532
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- 5
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发布时间：2021-12-10 - 摘要：Reduction stress concentration effect of structure, changing the structure geometry and reducing the geometry of structure are effective methods to realize the lightweight and improve the endurance strength of welded bogie frame. Taking a bogie frame structure as an example, based on the structural fatigue strength evaluation method of DVS 1612 standard and the specified welding joint quality level, the local welding joint optimization and the local structure shape optimization were carried out in the area of high stress concentration effect of the structure, and the availability of the welded joint located in the area between anti-roll bar mounting block and side frame cover plate had dropped from 1.773 to 0.704/0.871 . At the same time, the thickness of the lower cover plate of the side beam, the inner and outer vertical plates of the auxiliary longitudinal beam and the wall thickness of the steel tube of the transverse beam were reduced. On the premise of meeting the fatigue strength, the goal of lightweight and local structure optimization of the frame was realized.关键词：bogie;welded frame;endurance strength;DVS 1612;lightweight;structure local optimization;FE model
- 1221
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- 5
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发布时间：2021-12-10 - 摘要：According to the special power supply requirements of Sudan users, an auxiliary power supply system was proposed, which was driven by diesel engine of power vehicle, and supplied power for auxiliary equipment of power vehicle and trailer equipment after frequency conversion and voltage transformation. The design and selection process of auxiliary generator and AC auxiliary power supply cabinet were mainly introduced. The application of DMUs showed that the auxiliary power supply system met the design requirements.关键词：Sudan;DMUs;train power supply;auxiliary power supply;auxiliary generator
- 533
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- 5
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发布时间：2021-12-10 - 摘要：The structure of a new welding bogie and the material selection of bogie frame were introduced, and the finite element analysis and strength test were made for the bogie frame based on the EN 13749—2011 standard. The three-dimensional model was discretized by Hypermesh software, and the finite element analysis was carried out. The static strength test and fatigue test were organized on the fatigue test bench by using a new test method of bogie frame. The performance of bogie frame and test tool was inspected by making use of calibration static loads combinations and normal service loads combinations in the process of test. The simulation and test results showed that the new welding bogie frame met the design requirement.关键词：bogie frame;strength test;simulation analysis;test method;calibration static loads combinations;FEA
- 543
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- 3
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发布时间：2021-12-10 - 摘要：According to the communication requirements of CR200J EMUs microcomputer network control system, the design of man-machine interface based on MVB and ethernet dual network redundancy was proposed, and the specific solution was described in detail. Starting from the technical indicators of software, hardware and dual network communication, the functional structure diagram of man-machine interface was introduced, focusing on the key interface design based on dual network redundancy, and leading to the innovation of data display and processing mechanism of all network sub equipment in the case of dual network. The test results showed that the display screen of this design scheme has stable operation, friendly interface, perfect function, which meet the design requirements, and improved the reliability and safety of locomotive operation.关键词：centralized power EMUs;DDU;MVB communication;ethernet communication;redundancy;interconnection
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发布时间：2021-12-10
Research & Development
- 摘要：In intercity vehicle, the air conditioning and ventilation system has an important impact on breeze speed, temperature and humidity of which directly affects the thermal comfort of passengers. The three-dimensional full flow field geometric model of the air conditioning and ventilation system in the passenger compartment of an intercity vehicle was established. By combining SIMPLE algorithm with the Realizable k-ε turbulence model, and adopting the flow inlet and outlet boundary, the simulation calculation of the full flow field in the passenger compartment of the whole vehicle was completed. The accuracy of the simulation results was verified by the test, and the flow field distribution, breeze speed, speed field and temperature field in the passenger compartment were further analyzed. The results showed that the distribution of flow field and temperature field in the passenger compartment of the whole vehicle was even, which met the requirements of engineering design.关键词：intercity train;HVAC;numerical simulation;experimental research;flow field;simulation model
- 321
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- 2
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发布时间：2021-12-10 - 摘要：In order to improve the energy-absorbing performance of the main energy-absorbing structure at the cab end of the urban rail vehicles, the underframe end sill and the sheet thickness of the main energy-absorbing structure were optimized by means of simulation analysis. Considering the influence of optimal location on energy absorption, the collision model of cab car versus cab car modal of one urban rail vehicle with a relative velocity of 25 km/h was developed. The maximum impact velocity without crushing and the energy absorption before and after structural optimization were obtained by collision analysis and calculation. The results showed that increasing the stiffness of the underframe end sill and reducing the sheet thickness of the main energy-absorbing structure can satisfy the orderly controllable deformation law of the cab end energy-absorbing system, as well as the energy-absorbing performance can be improved, which provided a theoretical reference for the optimization design of the main energy-absorbing structure.关键词：urban rail vehicle;crash;energy-absorbing structure;energy-absorbing performance;simulation analysis;finite element model
- 554
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- 2
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发布时间：2021-12-10
Urban Rail & Vehicle
- 摘要：Overhead catenary is an important device for traction equipments of electrical railway, therefore the condition of overhead catenary will impact the operation safety for the railway. In order to design a set of device on the operating EMUs to monitor the operation state of the catenary in the whole process, starting from the design requirements, design principles and design scheme of the system, the non-contact image processing, machine vision and infrared temperature measurement key technologies were introduced to complete the system design of the device, and the performance of the device was verified through static and dynamic tests. According to the feedback of test and field application, the device met the requirements of technical conditions. Meanwhile, the detection results of the device on the catenary could provide basis for the maintenance of the catenary.关键词：EMUs;overhead catenary;dynamics geometric parameters detection;dynamic experiments;high-speed railway;faults locating;monitoring device of operation state
- 517
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- 7
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发布时间：2021-12-10 - 摘要：According to the statistics of advanced repairs for high-speed EMUs, rust and peeling are the main faults in bearing system. At present, there are two kinds of bearing fault monitoring systems for high-speed EMUs, i.e., on-vehicle shaft temperature monitoring system and TADS trackside acoustic diagnosis system, which have high accuracy for the determination of faulty bearings, but also have their own limitations to a certain extent. Aiming at the abnormal bearing problems of high-speed EMUs that not detected by both the on-vehicle temperature monitoring system and the TADS trackside acoustic diagnostic system, the vibration test by the transmission monitoring system and the noise test by the portable noise equipment were carried out, and by using FFT, STFT and other technical means to identify the fault frequency, the fault source was found out, which should provide important help for the axle box bearing fault diagnosis.关键词：EMUs;bearing;abnormal noise;fault diagnosis;vibration test;noise test
- 576
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- 3
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发布时间：2021-12-10
Test & Detection
- 摘要：Aiming at the malfunction of abnormal start of door closing obstacle detection during the main line operation of Guangzhou metro line 7 vehicle, the principle of door closing anti-pinch detection was introduced, the causes of the malfunction were deeply analyzed, and corresponding corrective measures were implemented, which effectively reduced the door failure rate.关键词：metro vehicle;door;obstacle detection;fault diagnosis
- 365
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- 8
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发布时间：2021-12-10
Operation & Maintenance
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