最新刊期
期 3 ， 2021
- 摘要：The new round of scientific and technological revolution has propelled the informatization of the urban rail transit industry into a stage of intelligent development, and hence the traditional construction mode and operation service mode have been gradually changed. However, due to diverse factors such as geographic environment, level of economic development, and population density, the development of rail transit in various cities in China is uneven. In order to promote the healthy and orderly construction of informatization and intelligence of the urban rail transit industry, top-level design is needed to coordinate development strategies, clarify construction goals, determine key tasks, and plan implementation paths. The advanced information and communication technology was used to realize real-time data interaction among traction substations, bidirectional converters, trains, signal system, and energy management and control system (ECMS) in this paper. From the perspective of traction grid source and load matching, energy utilization, power quality, and system security, an integrated, collaborative and shared urban rail transit smart traction power grid was built to implement systematical energy dispatch between trains and substations, load forecasting, fault location, and train operation plan optimization. Taking an actual metro line 2 of a certain city as an example, the effectiveness of the proposed smart traction power grid was verified on the road-network-vehicle integrated simulation platform. Finally, the key issues that need to be further studied and resolved in engineering practice were provided.关键词：urban railway system;traction power supply;energy management and control;system energy saving;load forecasting;operation plan optimization;fault location
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发布时间：2021-12-09
Synthesis
- 摘要：Aiming at the problem of track irregularity detection method and accuracy, a strap-down inertial navigation technology was proposed. A quaternion based "mathematical platform" was built. By integrating odometer and radio frequency tag, the mileage position information was corrected; By integrating accelerometer and gyroscope data of inertial measurement unit(IMU), the axle attitude was calculated; By using complementary filtering algorithm for data fusion, and using chaotic-enhanced fruit flyoptimization algorithm (CFOA) for filtering, the wheel axle three-dimensional attitude data expressed by Euler angle was obtained, and then fitted to realize the track irregularity detection. Practice shows that the data fusion detection algorithm proposed in this paper can effectively realize the track irregularity detection, improve the detection accuracy, and provide basic data for track maintenance.关键词：track irregularity;irregularity detection;SINS;data fusion;CFOA;attitude calculation
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发布时间：2021-12-09 - 摘要：Using proper line correction optimal design parameter can reduce overall adjustment quantity of line correction and maintenance. An existing line correction method based on the cuckoo search algorithm was proposed in this paper. First, equation of straight line between curves was established by least square method, and each feature points were identified and calculated. Then with the minimum sum of the absolute value of the line adjustment quantity of each measuring point as optimization goal, with intercept and slope of straight line between curves, length of transition curve and circular curve radius as independent variable, a model was established by using cuckoo search algorithm, and the optimization design parameters of line correction were obtained by solving. In order to verify the effectiveness of the algorithm, the plane measurement coordinates of a certain section of the Shanghai-Kunming line were used as the test object. Under the conditions of unconstrained, overall constraint, and single-point constraint, the overall adjustment quantity obtained by optimization was smaller than traditional method. The results showed that the optimal design parameters obtained by this method could make line adjustment quantity smaller than previous methods, and have the advantages of strong data processing applicability and more accurate calculation results.关键词：track maintenance machine;existing line correction;Cuckoo search algorithm;adjustment quantity;total least square fit
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发布时间：2021-12-09 - 摘要：The passing speed is much lower than the design speed of curved track when rail grinding wagon performs the curve grinding operation, which results in the excess superelevation phenomenon. The rigid-flexible coupled dynamics model of rail grinding wagon was established using the FEM software ANSYS and the multi-body simulation software Simpack considering carbody flexibility. The contact relationship between the grinding wheels and rail was introduced in the model to study car-body elastic deformation on the dynamic performances. The dynamic responses of curve radius and superelevation were compared and analyzed under grinding operation conditions and free running. The results showed that the car-body elastic deformation mainly affected derailment coefficient and wheel unloading rate, but had little influence on the wheel axle lateral force and roll coefficient. After considering the car-body as a flexible body, curving passing performance of the rail grinding wagon had been improved. Within a certain range, increasing the curve radius and decreasing the superelevation could improve curving passing performance of vehicle. Grinding would worsen curving passing performance of vehicle and increase the risk of derailment.关键词：rigid-flexible coupling;rail grinding wagon;dynamics performance;curve passing;FEA;rail
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发布时间：2021-12-09 - 摘要：In the detection process of high-speed rail flaw by ultrasonic flaw, there are some abnormal echoes in rail head near the bolt holes in B scan sometimes, however, they are not echoes from defects but ghost echoes actually. They are so similar to transverse defects in rail head that they can be easily misidentified as serious defects. According to the principle of ghost echoes, the propagation paths of ghost echoes was analyzed based on the B scan data of 60 kg/m rail detected by rail flaw detection vehicle. Ghost echoes from bolt holes were finally verified by the comparison of the calculated result with actual data and the simulation with CIVA software. Furthermore, the characteristics of ghost echos were summarized in this paper, which can provide theoretical support for the recognition of ghost echoes from bolt holes, improve detection rate and reduce false alarming rate.关键词：rail flaw detection vehicle;ultrasonic detection;ghost echo;rail bolt hole;B Scan;rail
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发布时间：2021-12-09 - 摘要：In order to improve the efficiency of rail grinding, according to the existing machining and grinding principles of machine tools and the calculation method of high-speed cutting specific grinding energy, the application research of precision control technology for medium and low speed rail grinding was carried out. Taking the standard 60N rail profile grinding as an example, the geometric features of the profile surface were extracted and divided into four grinding areas. According to the empirical relationship between the rail pre-grinding profile surface ratio grinding energy and the amount of grinding, the empirical calculation model of the grinding amount of the rail profile surface is established, and the feasibility and accuracy of the calculation model were verified through on-site grinding tests. The results showed that after three grinding calculations, the maximum grinding amount of rail head profile area 2 was 7.28 mm2, and the minimum grinding amount of area 3 was 1.18 mm2, and the total cutting amount of the on-site grinding test was relative to the theoretical calculation. The deviations were -3.57% and -4.24%, respectively, and the total grinding results were consistent with the rail grinding accuracy requirements.关键词：rail grinding;specific grinding energy;empirical model;rail head profile;grinding test;rail
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发布时间：2021-12-09 - 摘要：The rail grinding vehicle transmits the power to the grinding device at the bottom of the vehicle body through the traction mechanism, so that it can run and grind along the rail. For rail grinding device, the traditional installation method of traction mechanism was cable-stayed traction with angle. In view of the problems of this type of traction, the structural form of vertical traction mechanism was creatively proposed in this paper. Taking a rail grinding vehicle as an example, the traction force, the static analysis of the traction mechanism and the dynamic characteristics of the grinding device were analyzed. Through the analysis and calculation,the mechanical properties of the vertical traction mechanism can meet the requirements of the grinding device, and the grinding device with this type of traction had good stability and curving performance. The vertical traction mechanism of grinding device can avoid the problems of traditional cable-stayed traction mechanism and had a good application prospect.关键词：grinding device;traction mechanism;vertical type;static strength;dynamics;rail
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发布时间：2021-12-09 - 摘要：Taking the rail grinding control strategy as the research object, the basic theory of rail grinding and the PID control theory of grinding pressure were analyzed by establishing the three-dimensional coordinate of rail grinding, and the important factors and key parameters that affect rail grinding effect were obtained. The control strategy and scheme of rail grinding were put forward, and the principle and flow of the control strategy scheme were introduced in detail. By designing the control system and verifying it through a large number of loading applications, the performance of the control system was tested. The test results show that: the autonomous grinding control system developed by strategy scheme can achieve smooth and no impact falling track with highly synchronized falling point, and the overall grinding effect is good, which has a good market application prospect.关键词：grinding theory;fall rail control;PID control;control system;rail grinding
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发布时间：2021-12-09 - 摘要：In order to realize the train traction during the train collision test, an electric system based on lithium iron phosphate power battery, direct AC electric drive, MVB network communication, radio wireless communication and ground signal automatic control was introduced, which was used for railway collision test battery engineering vehicle. The power battery system, traction system, network control system and auxiliary power supply system were mainly introduced, and the main technical characteristics were summarized and analyzed. The system had passed the test and field verification. The practical results show that the driving vehicle can meet the requirements of remote automatic control function of traction, braking and decoupling during track collision test. The cruise accuracy at fixed speed is high, the traction performance and control function are stable and reliable, and the power system is energy-saving and environmental protection. It is of great significance to realize the functions of constant speed cruise, wireless communication and ground signal control for battery engineering vehicle or other electric engineering vehicles.关键词：crash test;battery engineering vehicle;wireless communication;remote control;ground signal system;constant speed cruise
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发布时间：2021-12-09 - 摘要：In recent years, the use of large road maintenance machinery (hereinafter referred to as large machines) due to improper management of iron shoes, resulting in frequent accidents, which seriously affects the production safety. A new type of intelligent management system of iron shoes was proposed, which can monitor the setting state of iron shoes of the whole train of large machine units in real time through radio frequency technology and LoRa networking technology. The system would alarm and shut off the running power of the machine when it was not set or removed correctly, thus it effectively improved the safety of iron shoes. At the same time, the data interaction between the large machine set and the ground server through the 4G network could realize the remote monitoring and information management of the iron shoes.关键词：large track maintenance machinery;iron shoes intelligent management system;RFID;LoRa networking;direction chain
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发布时间：2021-12-09
Rail Engineering Vehicle Column
- 摘要：The resilient wheel bolts are used to fasten the wheel core and the mounting ring, and are subjected to pre-tensioning and tensile loads in operation. Their stress state is critical to assess the operational safety of the resilient wheel. The three-dimensional fi nite element model of the resilient wheel was built by using the fi nite element software. The initial tension state of the bolt was simulated through applying static load, and the contact state between the components were simulated by using the contact unit and the target unit. The initial interference contact state between the wheel core and the mounting ring and between the rubber and the rim was numerically simulated by setting the interference amount. Based on UIC 510-5 and EN 13979-1 standard, the impact of bolt failure on the overall static strength of the resilient wheel was investigated. The research results showed that the risk coef fi cient of each wheel component did not exceed 0.61 in normal condition. The maximum Von-Mises stresses of the wheel core, mounting ring, bolt and rubber block under the considered operating conditions increased with an increase of the number of failed bolts. When fi ve bolts failed, the risk coef fi cients of the rim, wheel core, mounting ring, bolt and rubber block were, respectively, 0.27, 0.92, 1.01, 0.95,0.40. In operation the failure of the discussed bolts had no signi fi cant effect on the maximum Von-Mises stresses of the wheel rim. The conclusions provided a reference for the static strength check of the resilient wheels of rail vehicles.关键词：resilient wheel;bolt;pretension force;strength analysis;fi nite element method
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发布时间：2021-12-09 - 摘要：When the high-speed train passes through a tunnel, the tunnel pressure wave will induce the pressure variation inside coach by causing the shape deformation of the train and the air exchange via sealing gaps and the ventilation ducts, and result in the discomfort to the passengers. In order to investigate the pressure fl uctuation caused by the deformation of vehicle body structure, the completely sealed model of vehicle body and carriage structure was built. Based on the STAR-CCM+/Co-Simulations module, the vibration displacement, the amplitude and the change rates of pressure inside coach of high-speed train passing through the tunnel at 350 km/h were calculated by simulation and compared with the theoretical numerical simulation of gas state equation. The results showed that: The largest vibration displacement occurred in the door; The error of the 2 numerical simulation methods based on the fl uid-solid coupling model and the ideal gas state equation was 16.8%, which veri fi ed the reliability of the calculated results; The pressure inside coach was inversely proportional to the coach volume; The maximum negative pressure inside coach was less than 195.3 Pa, and the 3-second change rate of interior pressure was less than 203.1 Pa /(3 s), while the 1-second change rate of interior pressure was less than 149.6 Pa /s, which met the comfort requirements. It could also be helpful to establish the mathematical model of vehicle body under the interaction of multi-factor coupling.关键词：high-speed train;EMU;the shape deformation of the train;tunnel pressure wave;pressure fluctuation inside coach;simulation
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发布时间：2021-12-09 - 摘要：In order to optimize the limit value of CRH380B EMU flange thickness based on the wear law of wheelset and vehicle dynamics performance under different flange thickness, the numerical solution method combined with the multibody kinetic software and Archard wear theory were used. The nonlinear wear equation was used to predict the wheel wear and the multi-body parallel simulation method was used to update the state parameters and contact forces in real time. Combined with the simulation analysis and the comparison of measured data, the results show that the thickness of the flange has no significant influence on the wheel wear when the running speed of the vehicle is lower than 350 km/h. At the same time, after the occurrence of wheel wear, the vehicle sets with different flange thickness still maintain good dynamic performance. Therefore, on the basis of ensuring the running quality and safety of the vehicle, the limit value of the flange thickness can be reduced to 28 mm to improve the service life of the wheels and reduce the operating cost of EMU.关键词：EMU;flange thickness;wheel wear;simulation;optimization research;vehicle dynamics;high-speed train
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发布时间：2021-12-09 - 摘要：In order to improve the safety of the braking process of high-speed train, the brake disc heat dissipation structure needs to be optimized. The ANSYS-workbench software was used to establish a three-dimensional transient model. The temperature field simulation was performed on the brake discs with 8 different structural parameters based on the energy folding algorithm. The initial friction braking condition was obtained when the initial braking speed was 350 km/h. The change mechanism of the temperature field and the thermal stress field of the brake disc was analyzed by changing the height, the arrangement density and the discharge angle of the radiator. The simulation found that increasing the drainage angle, height of the heat dissipation ribs, and reducing the arrangement density can contribute to the heat dissipation of the brake disc; in the emergency braking project, the highest temperature point is on the brake disc surface, and the maximum thermal stress is on the side of the heat dissipation rib; In all 8 schemes, scheme 7 meets the braking requirements of high-speed trains with the initial speed of 350 km/h, the highest temperature is the lowest in all schemes, and the maximum thermal stress is reduced by 36 MPa.关键词：high-speed train;brake disc;heat dissipation rib;temperature field;thermal stress;finite element method;numerical analysis
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发布时间：2021-12-09
Railway Rolling Stock
- 摘要：This paper focused on the single-phase cascade H-bridge rectifiers used in high-speed EMU power electronic transformers, which was susceptible to grid-side voltage sensor failure. A control method for single-phase cascaded H-bridge rectifiers based on virtual flux estimation without the grid-side voltage sensor was proposed and verified by simulation experiments. In this paper, a mathematical model in the d-q coordinate system of a single-phase cascaded H-bridge rectifier was established first, then a d-q current decoupling control method using virtual flux estimation was proposed based on the principle of the none grid-side voltage sensor control algorithm used in the three-phase system, which solved single-phase cascaded H-bridge rectifier’s no grid-side voltage sensor control problems. Later, a corresponding simulation was set up to simulate a variety of complex working conditions of the rectifier, verify the stability of the control algorithm, and compare with the method based on grid-side voltage sensor control algorithm. The results showed that the control method proposed in this paper can basically achieve the control performance with the grid-side voltage sensor.关键词：high speed train;EMUs;single-phase cascaded H-bridge rectifiers;none grid-side voltage sensor;virtual flux estimation;d-q current decoupling control;simulation
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发布时间：2021-12-09 -
Reconnection Design Between Bus-based and Switching-based Network Control System of High-speed Train
摘要：At present, there are mainly two communication modes in network control system of high-speed EMU in China: bus-type and switched-type. In some special cases, the two communication modes trains with the same speed grade need to realize connectivity. However, there are some differences between these two kinds of network control system, such as technical characteristics and working principle, the connectivity of this two systems is difficult. Therefore, a reconnection scheme of bus and switched high-speed train network control system was proposed, including train network topology scheme, adaptive reconnection strategy, initial operation process realization and connectivity control, etc., and verified on Fuxing EMU. The verification results show that the scheme can realize the connectivity control of different communication types of trains, which has a very important practical significance to improve the efficiency of train operation.关键词：high-speed train;train communication network;bus-based type;switching-based type;reconnection control;connectivity;high-speed railway- 379
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发布时间：2021-12-09
Electric Traction and Control
- 摘要：In ZVS-LLC resonant converter, proper dead time is essential for IGBT to realize zero-voltage-switching. In fact,the output capacitor of the IGBT is not constant when the IGBT is switching off, which makes the design of the dead-time relatively complicated. The switching characteristics of the IGBT was analyzed, indicating that in the LLC resonant circuit, the higher the working temperature and the heavier the load power were, the less conducive to realize the soft-switching of the IGBT. It was proposed that the minimum and maximum dead-time should be designed at the full load and the maximum working temperature condition. Finally, a 60 kW LLC converter was built to verify the correctness of the optimal design. The experiment results basically consistent with the theoretical calculation results.关键词：LLC resonant converter;IGBT;soft-switching;dead-time
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发布时间：2021-12-09
High-Power Devices
- 摘要：In order to solve the problems that there are many application requirements for smart stations, there is no uniform standard for design and construction, and the application items still need to be actually tested and improved, in view of the needs of urban rail transit passenger transportation organization, passenger service and equipment maintenance for the construction and operation of smart stations, the comprehensive transportation management platform, passenger service, operation management and equipment management of the station were analyzed, combined with the development direction of the current new generation of information technology, the overall structure of the smart station was proposed, which clarified the key technology of smart station construction and provided the future track reference ideas for the construction and operation of traffic stations. With the smart transportation management platform as the core, the smart station model based on operation management, operation and maintenance management and passenger services can effectively improve station management efficiency, shorten emergency response time, and reduce operation and management costs, which will become a smart station construction and promotion application direction.关键词：urban rail transit;smart station;integrated operation management and control platform;metro;smart service;smart management
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发布时间：2021-12-09 -
Research on the Overall Scheme of Electric Locomotive Fault Prognostics and Health Management System
摘要：In order to effectively improve the safety and reliability of electric locomotives in the driving process, the research on electric locomotive failure prediction and health management technology was carried out and an overall system plan was formed, which realized the health management of intelligent monitoring and fault prediction of the important components of electric locomotives. The electric locomotive health management system researched and designed had been applied to Jingshen electric locomotives and achieved preliminary results, which laying a foundation for the subsequent deepening of research, and supporting the realization of conditional maintenance of electric locomotives.关键词：rail transit;electric locomotive;failure prediction and health management;conditional maintenance;fault diagnosis- 295
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发布时间：2021-12-09 - 摘要：Aiming at the difficulty of extracting the early fault features of rolling bearings, a rolling bearing fault diagnosis method based on Morlet wavelet and scale space was proposed. The frequency band boundary was divided by the scale space to obtain the resonance frequency band, and the frequency band boundary information was substituted into Morlet wavelet to construct a filter bank to filter the signal. Due to the problem of over-segmentation of the scale space division frequency band boundary, the envelope correlation kurtosis was introduced as an index, and a scale space optimization spectrum method was proposed to identify the optimal resonance frequency band of the fault. The validity of the method was verified by simulation signals and bearing fault signals obtained from bench tests, and compared with the fast spectral kurtosis method. The results showed that this method could accurately identify the optimal resonance frequency band and realize bearing fault diagnosis. At the same time, the diagnosis effect was significantly better than fast spectral kurtosis index.关键词：rolling bearing;Morlet wavelet;scale space;fault diagnosis;correlation kurtosis;fast spectral kurtosis
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发布时间：2021-12-09
Intelligent Technology
- 摘要：In order to accurately detect the performance of the DC 600 V power supply and improve test efficiency, based on the principle of resistive load test, an automated test system for performance detection of DC 600 V power supply devices of harmony electrical locomotives was proposed. By using LabVIEW platform, the test system application software was developed, and TestSand software was used to serialized the test process. The current, voltage and grounding faults of DC 600 V power supply device under no-load and full load conditions were tested with the test system. The test results indicated that the test system could realize the detection of the voltage, current and grounding faults of the locomotive DC 600 V power supply unit in a variety of operations, which met the maintenance requirements of the locomotive DC 600 V power supply device.关键词：DC 600 V power supply;performance test system;fault detection;harmony electric locomotive
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发布时间：2021-12-09
Railway Electrification
- 摘要：In order to make up for the lack of detection methods for catenary in China, a set of on-line monitoring system for catenary compensation devices was designed, realizing the functions of collecting, transmitting, storing, displaying and analyzing the b-value of the catenary compensation device. The data information was collected by the hardware detection terminal and wirelessly transmitted via GPRS. With website development, the data information was received and analyzed in real time to get the b-value and temperature fitting formula, and then predicted the change of b-value over the future time period. According to the b-value fluctuation,the contact suspension fault existing in the catenary was judged. With the testing and verification, the system has high measurement accuracy and strong stability.关键词：catenary;on-line monitoring;wireless transmission;website development;data analysis
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发布时间：2021-12-09
Detection Technology
- 摘要：The three-axle bogie frame was taken as the research object, the reliability analysis for structural strength and fatigue life of the key welds were carried out. Based on the thickness variables of key plates, the anti-fatigue lightweight model for the bogie frame was proposed with strength and fatigue life constraints. This optimization model was solved by the reduced response surface method. The optimization results showed that the total mass was reduced by 4.3%. This optimization result was more reasonable by consideration of uncertainties, which provided a reference for structure optimization.关键词：bogie frame;fatigue life;reliability analysis;response surface methodology;structure optimization;FEA
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发布时间：2021-12-09
Reliability Engineering
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