最新刊期
期 1 ， 2021
- 摘要：Transmission machineries such as traction motors, couplings and gears are widely used in rail transit vehicles,which are regarded as important parts of the power chain of high-speed trains. Due to the long-term operation in complex and harsh environment, the influence of wide speed range, heavy load conditions and rail surface impact, the transmission components are easy to cause faults, which will affect the normal operation of vehicles and traffic order. Therefore, warning potential faults timely is of great significance to guarantee the normal operation and traffic order of rail transit vehicles. Because the diagnosis method based on electrical signal has the advantages of easy signal acquisition, high signal reliability and accuracy, non-embedded monitoring of object equipment,it has gradually become a research hotspot in the field of rail transit diagnosis. The fault mechanism of key components in rail transit vehicles power chain was first described. Taking the diagnosis method based on electrical signal as the breakthrough point, the existing diagnosis methods and research findings in this field was sorted out and analyzed. Then, based on the theory of multi-feature fusion and machine learning, a new electrical signal diagnosis method was proposed. The data of each electrical signal was obtained, the wavelet de-noising was performed first, and the signal-to-noise ratio was improved through signal decomposition and reconstruction, then different fault features were extracted based on the reconstructed signals, and finally the decision tree to integrate the fault features for diagnosis was used. The verification test and actual application results showed that the electrical signal diagnosis method proposed in this research can effectively detect and identify power chain faults, realize early fault warning, which can ensure the driving safety of vehicles.关键词：high-speed train;rolling bearings;traction motors;gear;signal processing;machine learning;fault diagnosis;rail transit
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发布时间：2021-12-09
Special Report
- 摘要：Several new polymer materials in China were reviewed. The functional characteristics and technical key points of typical new polymer materials were analyzed and the application in railway traffic was introduced. The research direction of polymer materials for railway traffic in China was pointed out.关键词：railway traffic;polymer materials;polyurethane;silicone;Nylon;aramid fibre;composite materials;high-speed railway
- 497
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发布时间：2021-12-09 - 摘要：The characteristics of bonding technology and its application status in the four aspects of window glass, body exterior,interior parts and interior floor of rail transit vehicles were introduced. The classification method and characteristics of adhesive bonding grade were discussed. The application methods of adhesive selection and substrate surface treatment were expounded. The aging reasons of adhesive, relevant standard and test methods after bonding in train operation were also introduced, the limitations of the bonding technology were also pointed out. Finally, the application prospect and product development direction of bonding technology in the field of rail transit vehicles were prospected, so as to make the bonding technology better promote the development of rail transit industry.关键词：adhesive;rail transit;bonding;surface treatment;aging
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发布时间：2021-12-09 - 摘要：Aiming at the shortcomings in the traditional design methods of rubber elastic element molds and vulcanization process schemes, a vulcanization process simulation analysis technology and its application and achieved effects in the three elements of vulcanization and mold injection system design were introduced, which can be effective to reduce the costs of product trial and repair molds, shorten the R&D cycle, and save R&D costs关键词：rubber elastic element;vulcanization process;simulation;rail transit;FEA
- 370
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发布时间：2021-12-09 - 摘要：Polyimide (PI) is widely used as an important insulating material for the inverter-fed traction motors of the high-speed trains. The mixed alumina fillers were prepared by using macro, sub-micro and nano alumina particles. The polyimide/alumina composites were prepared by in-situ polymerization. The effect of the ratio of particle size (30 nm/0.2 μm/1 μm) and the imidization temperature on the properties of the polyimide composites was investigated. The results show that the polyimide composite films prepared at the appropriate imidization temperature have good thermal conductivity, mechanical properties, electrical properties and thermal stability when the ratio of alumina particle size (30 nm/0.2 μm/1 μm) is 1:2:7.关键词：rail transportation;high-speed train;polyimide;alumina;composite;preparation
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发布时间：2021-12-09 - 摘要：With the development of material science technology, the various materials, process methods and adhesives of rubber formula have been developed as well. The bond strength between rubber and metal can even exceed the tensile strength of the rubber itself, which results in the rubber free profile of convex shape could be adopted in the design of locomotive bearer spring. Taking the design of classic bearer springs as an example, a new design approach of the vertical stiffness with the FEA method was proposed. The new method and the new idea of the approach proposed based on the research was discussed that the vertical stiffness of bearer spring can be changed significantly when the rubber free profile was designed to be convex shape under the condition of unchanged material parameters, structure type and interface size.关键词：locomotive bearer spring;rubber free profile;finite element;stiffness
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发布时间：2021-12-09 - 摘要：Carbon-fiber composite has become the preferred material for lightweight engineering applications, because of its high specific intensity, high specific stiffness, and good structural designability. With an aluminium alloy electric cabinet as the model prototype, a carbon-fiber composite cabinet was designed, and the contrastive FEA of static strength and modal was finished, which passed the shock and vibration and protection tests. According the results of FEA and tests, the carbon-fiber composite electric cabinet could meet the operation requirements for railway vehicles with good lightweight effect, which accumulated experience for the future application of carbon-fiber composites in the electrical equipment of railway transit.关键词：carbon-fiber;composite;lightweight;railway vehicle;finite element analysis
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发布时间：2021-12-09 - 摘要：In order to understand and master the real change after the operation of a lifespan (5 years or 600,000 km) of the primary conical rubber spring, which is a critical part for railway vehicles, and to provide data support for life extension research and products localization, primary conical rubber springs of railway vehicles were set as the research object and tested. The data of key characteristics and rubber material were achieved by testing the rubbers samples which composed of new manufactured samples and samples that have been used in service for a lifespan. The test results showed that the appearance and bonding performance of the primary conical rubber springs after the operation for a lifespan still remained in good condition, and their vertical stiffness, lateral stiffness, longitudinal stiffness were increased, while compression height, fatigue tolerance, and aging resistance were decreased. Finally, according to the actual change from the research, the optimization suggestions for research on domestic production of conical rubber spring were proposed.关键词：railway vehicles;primary conical rubber spring;change of characteristics;change of rubber;optimization suggestion;life extension
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发布时间：2021-12-09 - 摘要：The nano-composites were prepared with ethylene-propylene diene rubber (EPDM) and organic montmorillonite(OMMT) nano-composite as basic material, and polyhedral oligomeric silsesquioxane(POSS), aluminium hydroxide(Al(OH)3), expanded graphite(EG) as additives. The flame retardant properties and mechanical properties were tested by cone calorimeter and smoke density etc. The results showed that, compared with the pure EPDM/OMMT nano-composite, adding POSS,EG and Al(OH)3 could effectively increase the charring and flame retardant properties. The mechanical properties of nano-composite prepared with EPDM/OMMT/EG or EPDM/OMMT/Al(OH)3 were reduced. The properties of inner/outer windshield rubber material which was prepared with EPDM/OMMT/EG or EPDM/OMMT/Al(OH)3 could meet the flame retardant and functional requirements. In addition, the tensile strength, low temperature and retardant performance were more excellent than the foreign samples. At present,the engineering application of multivariate nano-composite in a variety of high-speed train windshield has been realized.关键词：high-speed train;EPDM;OMMT;nano-composite;POSS;EG;heat release rate;smoke density
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发布时间：2021-12-09 - 摘要：The dynamic model of a linear motor metro vehicle was established by using multi-body dynamics software. Using Simpack and Simulink co-simulation method and considering the actual traction force, braking force and electromagnetic force on the vehicle, based on the actual needs of the project, the air gap of motor, vibration of motor and axle box as well as various dynamic indexes during coasting, traction and braking of the metro vehicle before and after replacing the cast iron brake disc with the aluminum matrix composite brake disc were analyzed. The results showed that the vibration of the motor and axle box was little influenced by the change of the brake disc, the nonlinear critical speed of the vehicle was slightly increased, the stability and comfort index of the vehicle was little difference, and the lateral force and derailment coefficient of the vehicle were little different before and after the change of the brake disc; Due to the light weight of the replaced aluminum composite brake disc and the reduction of non-sprung mass, the wheel rail vertical force and wheel load reduction rate were improved.关键词：linear motor;metro vehicle;urban rail transit;electromagnetic force;aluminum matrix composites;brake disc;dynamic performance
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发布时间：2021-12-09 - 摘要：Based on the application of railway vehicle body sandwich composites, through the study of mechanical and fi re-retardant property of foam core, the core material selection of vehicle body sandwich structure was carried out. The research showed that the developed PMI foam / aluminum sandwich structure body parts were assembled into a railway vehicle body, and the weight of PMI foam / aluminum sandwich structure body was reduced by 24%-28% compared with the same type aluminum alloy body. Also,the aluminum skin sandwich structure vehicle body had greater advantages in cost, ef fi ciency, safety and maturity compared with the fi ber resin skin sandwich composites.关键词：railway vehicle;sandwich structure;foam core;composites;vehicle body
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发布时间：2021-12-09 - 摘要：Q355GNHD high weathering steel is a commonly used material for advanced rail vehicle body, the plastic constitutive model of which under dynamic conditions is of great significance for the numerical simulation of vehicle body stress. The experiments on quasi-static and dynamic tensile mechanical properties of Q355GNHD high weathering steelis were carried out by MTS 647 Hydraulic Wedge Grip and AutoCAE (HRST-I) high-speed testing machine. The stress-strain curves of the material at 0.001-500 s-1 strain rate were obtained through the experiments. The strain rate loading effect was determined by analyzing the deformation law of the high weathering steel under the strain rate effect. Then, the strain rate related Johnson-Cook hardening model was constructed and the constitutive parameters were determined. Finally, the correctness of the model was verified by ABAQUS platform.关键词：high weathering steel;high-speed train;dynamic effect;strain rate effect;constitutive model;FEA;simulation
- 338
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发布时间：2021-12-09 - 摘要：The structure of rubber coupling was analyzed, and the calculation method of the displacement compensation and the stiffness of rubber coupling was proposed. According to the running condition of the LRV, the coupling strength and the load condition of rubber fatigue calculation were determined. The rubber coupling was proved to have good displacement compensation performance and high reliability by FEA calculation and test, which could meet the loading and running requirements of the LRV.关键词：LRV;rubber coupling;hollow connecting shaft;fatigue test;displacement compensation performance;FEA
- 430
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发布时间：2021-12-09
Material Column
- 摘要：Under the background of speed-up and heavy load of railway freight car in China, the demand for electro pneumatic braking, intelligent electronic monitoring and on-line operation safety monitoring is increasingly prominent. However, restricted by the operation and maintenance system of China's railway freight car, the existing vehicles are not equipped with power supply devices,resulting in that the electronic equipment cannot be applied. A technical solution for the shaft end generator installed at the end of the axle was put forward. However, due to the high impact vibration at the end of the axle, the high requirements of the generator volume and lightweight, the bad external environment, and the harsh requirements for the temperature rise and the reliability, the application of the shaft end generator would be seriously restricted. Aiming at the above difficulties in the development of shaft end generator,through electromagnetic-thermal-structure multi-physical field simulation and high protection level structure design of stator and rotor,a shaft end generator was developed, and the prototype trial production was completed. With the construction of shaft end generator test platform, the prototype type test and rolling platform test were completed, which met the requirements.关键词：railway freight car;shaft end generator;multi-physical field simulation;protection level;online monitoring;operation safety
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发布时间：2021-12-09 - 摘要：In order to study the temperature characteristics of the power battery of engineering vehicles, the heating power of battery at different SOC and charge-discharge rate was obtained by performing quadratic function fitting on the data measured at the charge-discharge rate of 0.5C and 1.0C. The temperature rise of traction battery was studied according to the heat transfer characteristics and heating power of battery. The research shows that the battery temperature is 45 ℃ after completing the traction on the strict line when the environment temperature is 40 ℃. The lithium-ion power battery can meet the cooling requirements of low rate discharge, short time operation and longtime stay of the engineering vehicle by natural cooling.关键词：engineering vehicle;lithium-ion power battery;urban rail transit;heating power of battery;heat transfer characteristics;temperature rise
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发布时间：2021-12-09 - 摘要：In order to solve the problem that the air circuit breaker cannot be manually reset in fully automatic unmanned subway vehicles, in view of the characteristics of the fully automatic unmanned system, the air circuit breaker matrix monitoring solution and the air circuit breaker remote reset solution were proposed in this paper. The program has been practically applicated to unmanned subway vehicles on Shanghai line 18 and achieved good results.关键词：urban rail transit;fully automatic driverless;subway;air circuit breaker;remote monitoring;remote reset
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- 21
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发布时间：2021-12-09
Railway Rolling Stock
- 摘要：How to control the high-speed train to achieve near-stop parking is extremely difficult under the condition of traction power net broken, especially when the railway profile is complicated, due to the power supply limitation of the onboard energy storage equipment. The function design and system structure design of urgent operation assistant driving were conducted to solve the speed curve planning problem. According to the characteristics of the train urgent operation, the train operation optimization algorithm was designed. Taking the CR400BF Fuxing EMU train running on a domestic high-speed railway as an example for simulation, the device could plan the running speed curve of the train’s self-running under the condition of limited energy, and achieved good energy saving compared with the driver’s cruise driving. At the same time, based on the energy-saving optimization control strategy, different traction target constant speeds were used for simulation, which showed that selecting the appropriate traction target constant speed according to the line conditions was of great guiding significance for the urgent operation driving of high-speed trains with limited energy.关键词：high-speed train;urgent operation;assistant driving;trajectory optimization;simulation;EMU
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发布时间：2021-12-09 - 摘要：Based on introduction of consist type and TCMS topology of CR200J-3 power concentration EMUs, the problems on the train’s WTB communication at a specific area were discussed, and the corresponding solutions were proposed in this paper. The testing results in practice operation demonstrated that the capability on anti-interference had been obviously improved, while the fault rate was decreased, which would provide an important support for train’s reliable running.关键词：EMUs;WTB;on-board network;gateway;communication anomaly;anti-interference;fault diagnosis
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发布时间：2021-12-09 - 摘要：Aiming at the problem of low power factor and efficiency of the asynchronous motor in the steady-state operation of the asynchronous generator in the traction power generation system of the diesel locomotive, the zero reactive power and the maximum torque-current ratio control method was adopted. Firstly, the electromagnetic relation of the induction motor in the rotating coordinate system was analyzed, and the equations of zero reactive power and maximum torque current ratio(MTPA) control were discussed. Secondly, under the limitation of the intermediate DC link, the field weakening curve of the asynchronous generator was analyzed, the minimum current operating point was found, and the current trajectory planning was completed. On the premise of ensuring the stable operation of the traction power generation system, the working efficiency of the motor and the inverter was improved. Finally, simulation of system was taken out with Simulink software.关键词：diesel locomotive;asynchronous motor;unit power factor;MTPA;field weakening control;simulation
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发布时间：2021-12-09 - 摘要：When the train fails, the on-board device DRWTD receives the corresponding fault data and sends it to PHM ground system in real time through wireless signals. Because DRWTD had transmission cycle and may interrupt communication with PHM ground system due to bad signal, the fault data received by PHM ground system would be deviated from the original data. Therefore, a processing model for fault data screening was proposed, and with MapReduce parallel computing, a fault screening software for PHM ground system of CRH2 EMU network control system based on MapReduce was designed to achieve the purpose of PHM fault data analysis and processing.关键词：EMU;network control system;fault;big data;PHM;high-speed train
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发布时间：2021-12-09
Electric Traction and Control
- 摘要：According to the design requirements of three-level power module for traction converter of CRH380A EMUs,combining the main circuit structure characteristics of three-level main circuit power module, IGBT driving circuit, laminated busbar and radiator of three-level power module were researched and designed, and three-level IGBT power module for CRH380A EMUs was developed. The test and operation results showed that the three-level IGBT module had good performance and could meet the requirements of CRH380A EMUs.关键词：high-speed EMUs;IGBT;laminated busbar;three level;IGBT drive;heat design
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发布时间：2021-12-09 - 摘要：If the low-frequency and large-scale oscillation of the traction grid voltage continues, the grid voltage protection of locomotive or EMU traction system will be influenced, resulting in converter traction blocking and affecting the normal operation of the train. In view of this practical engineering problem, the main influencing factors of train network oscillation were analyzed with impedance ratio criterion and Bode diagram, and verified according to computer simulation. Without adding any hardware circuit,the method of suppressing low-frequency oscillation of pantograph catenary by optimizing control parameters was proposed. The feasibility of the method was verified by hardware in the loop simulation.关键词：traction grid voltage;four-quadrant pulse rectifier;low-frequency oscillation;impedance ratio;stability analysis;hardware in the loop simulation;optimizing control parameter
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发布时间：2021-12-09 - 摘要：In view of the high risk of overheat for traditional air-cooled straight pipe heat pipe radiators in the low-speed operation of subway, a new type of heat pipe radiator that can effectively solve the problem above was proposed. Based on the temperature equalization technology, the application of numerical simulation and experimental testing methods, L-shaped heat pipes and temperature equalization pipes was used to achieve optimization on the basis of the original straight heat pipe radiator, and fi eld test veri fi cation was conducted on the subway line. The results showed that the application of L-shaped heat pipe radiator with equalizing temperature tube can effectively solve the problem of overheating in low-speed operation, which can be adapted to all working conditions, ensure the weight reduction and ef fi ciency increase on the premise of safety关键词：subway;heat pipe radiator;temperature uniformity;numerical simulation;IGBT;temperature rise;urban rail transit
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发布时间：2021-12-09
High-power Devices
- 摘要：Ultrasonic testing is widely used to detect rail internal fatigue damage in large-scale rail flaw detection vehicles. However, the existing domestic ultrasonic system architecture platform has the phenomenon of data congestion and computer crash when it is used in the detection of complex railway sections, which leads to the missing detection of sections. Moreover, the identification of the damage mainly depends on the whole manual playback. In order to improve the signal processing speed and damage identification ability, and reduce the workload of manual playback, ultrasonic flaw detection system based on new bus and intelligent damage identification technology based on convolution neural network deep learning were carried out. In order to improve the detection ability of rail surface and near surface damage, the research on rail surface image detection technology was carried out. In order to realize the synchronous data acquisition and playback of each detection system, and comprehensively determine the rail health status, a spatial synchronous positioning system was designed. After verification and comparison, on the premise that the average false alarm rate of injury was basically the same, the average artificial damage detection rate of the system using the deep learning algorithm was increased by more than 4% compared with the existing system; the synchronization error between the systems was within 1m, and the positioning accuracy of the actual review of the injury was within 3 m.关键词：ultrasonic;intelligent recognition;image detection;spatial synchronous positioning
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发布时间：2021-12-09 - 摘要：Multifunction vehicle bus (MVB) has been widely used in rail transit vehicles, but the poor working environment may result in the performance degradation of MVB network, which even endangers the driving safety in serious cases. Based on the analysis of common faults in MVB network, with extracting the network state features from the MVB physical layer and data link layer, an detection method based on heterogeneous Logistic ensemble learning to detect MVB network anomaly and avoid breakdown maintenance to the maximum extent was proposed. A MVB network experiment platform was constructed, and multiple sets of fault injection experiments were conducted. The experimental results showed the validity of the proposed method.关键词：MVB network;ensemble learning;anomaly detection;Logistic ensemble
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发布时间：2021-12-09 - 摘要：Aiming at the difficulty of extracting the weak fault features of the high-speed train bearing rotor system, a method for extracting the fault features of the high-speed train rotor system based on EEMD energy entropy-LPP was proposed. By combining EEMD, energy entropy and LPP, the vibration signal was subjected to EEMD adaptive decomposition, and the energy entropy of the high-frequency IMF component was calculated to obtain a high-dimensional feature vector set to complete the preliminary feature extraction; then the high-dimensional feature vector was converted by the LPP algorithm set projection to low-dimensional space to further extract features to form a low-dimensional sample set, which reduced the complexity of feature data while preserving the local geometric information of fault features, while improved the classification performance of fault pattern recognition; finally, the low-dimensional sample set was input to the KNN classifier for fault recognition. By comparing the classification effects of the first feature extraction and the second feature extraction, the results show that the model had superior clustering performance and could accurately identify several common high-speed train rotor system failure types.关键词：high-speed train;feature extraction;EEMD;energy entropy;LPP;fault diagnosis
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发布时间：2021-12-09
Intelligent Technology
- 摘要：Railway transit vital computer is the core equipment to ensure the safe and reliable operation of train. The common architecture of vital computer on rail transit was described, and the key reliability indexes by reliability analysis was calculated. An improved vital computer architecture was proposed based on the common redundant architecture in this paper. By contrast with currently commonly used architecture, the improved architectures can significantly improve system reliability, and can be widely used in railway system or product which demanding high traffic safety and reliability. The reliability analysis method and results described in this paper can be referred by other vital computer reliability analysis.关键词：vital computer;redundancy;FTA;Markov;transition matrix;reliability;failure rate
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发布时间：2021-12-09
Reliability Engineering
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