最新刊期
期 1 ， 2013
- 摘要：The thermal management of 1 500 A/3 300 V IGBT power module was developed in this paper. First, based on thermal nodes network, an equivalent circuit model for thermal resistance of power module was highlighted, from which the steady state thermal resistance was optimized theoretically. Then, thermal simulation of 1 500 A/3 300 V IGBT module was accomplished by means of finite element model (FEM). Finally, the thermal equivalent model of the IGBT module was verified by simulation results.关键词：power module;IGBT;thermal resistance analysis;node model
- 1094
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- 5
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- 0
发布时间：2021-12-13 - 摘要：Firstly, the module concept, packaging procedures, reliability and failure rules was presented. Then, the standard tests methodologies for investigating module reliability including endurance and environment tests were discussed. Lastly, the main failure mechanisms such as wire bonds failure, chip metallization reconstruction, solder layer fatigue and substrate delamination were studied.关键词：IGBT module;reliability;reliability test;failure mechanism;life
- 1708
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- 10
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- 0
发布时间：2021-12-13 - 摘要：Design of a novel pressure-contact IGBT module was stated. The advantages with respect to conventional IGBT modules were compared as well. The characteristics determined by static and dynamic tests demonstrated good performance and wide suitability for popular applications.关键词：press pack;IGBT module;structure design;characteristic analysis
- 914
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- 6
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- 0
发布时间：2021-12-13 - 摘要：In order to meet anti-vibration technology developing request, future technological development trends of rubber isolation components were discussed in environmental protection, life length, comfort, patent, light-weighting, nicety, function and intelligence.关键词：rubber isolation component;environmental protection;long life;light-weighting;nicety;intelligent
- 745
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- 2
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- 0
发布时间：2021-12-13 - 摘要：For guaranteeing safety of maintenance men and avoiding electric shock, key locking concept of the CRH3C high-speed EMUs was proposed and expounded on principle and process; at the meantime, safety idea what was called self safety, held and on duty by self was promoted.关键词：key locking;CRH3C high-speed EMUs;high-voltage equipment;safety maintenance
- 462
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- 2
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- 0
发布时间：2021-12-13 - 摘要：For studying longitudinal force bearing capacity of slave locomotives in heavy haul trains, nonlinear draft gear models and detailed coupler models were developed after the analysis of working mechanism of 13A/QKX100 coupler/draft gear systems. By utilizing a train model consisted of one HXD1 8-axle locomotive and two C80 freight wagons, dynamic behavior of coupler systems bearing longitudinal forces were analyzed and longitudinal force bearing capacity of slave locomotives was obtained. Study results showed that wheelset lateral force increased with longitudinal compressive force and coupler free angles, but not so obvious while coupler angles were small. Longitudinal compressive force bearing capacity of slave locomotives were larger than 2 500 kN when coupler angles smaller than 6 degrees or the coupler systems had frictional stability structure.关键词：slave locomotive;longitudinal force bearing capacity;coupler/draft gear system;heavy haul train
- 937
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- 2
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- 0
发布时间：2021-12-13 - 摘要：Based on Circular-Variable method, a three-dimensional coupling dynamics model of 20000-ton combined heavy haul train driving by two Harmony (HXD) locomotives was built, and train coupler force was compared in different locomotive marshalling position namely the 2+0, 1+1+0 and the 1+0+1 marshalling mode under traction and brake conditions which included the master and slave control locomotives synchronous traction, the slave control locomotive lag traction, the master and slave control locomotives synchronous brake, and brake with the controllable train tail device. The simulation results showed that under above calculation conditions, the coupler force of the 1+1+0 marshalling mode was the smallest, while under the 2+0 marshalling mode, the coupler force of the vehicles in the train and the impulse of the train were both the largest, and coupler force of the 1+0+1 mode was in middle between the 1+1+0 and 2+0 marshalling mode. In addition, when the controllable train tail device was installed on the trains, in brake condition, the coupler force of the train were all smaller compared to which of no train tail device. Thus, while marshalling for the 20000-ton combined heavy haul train, the 1+1+0 mode with controllable train tail device would be the best marshalling mode.关键词：combined heavy haul train;marshalling;traction condition;brake condition;coupler force
- 810
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- 3
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- 0
发布时间：2021-12-13 - 摘要：Focused on the electric traction system of SDA1 AC drive diesel locomotive, main drive system, control system, auxiliary converter system and technic innovation were introduced systematically. The electric traction system had good peoformance in tests and practial operating. The result indicated that the design of electric drive system was reasonable and reliable, and met the design requirement.关键词：SDA1 AC drive diesel locomotive;electric drive system;main drive system;control system;auxiliary converter system
- 852
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- 2
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- 0
发布时间：2021-12-13 - 摘要：Main technical parameters, design principle and structure features of main transformer for B0-B0-B0 AC drive electric locomotive were introduced, as well as the related protection and monitoring device of the transformer. With application in Uzbekistan locomotive, all performance index of main transformer was shown completely satisfy operation requirements.关键词：B0-B0-B0 axle arrangement;AC drive;electric locomotive;main transformer
- 924
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- 2
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- 0
发布时间：2021-12-13 - 摘要：The MVB communication network system which obeyed to IEC 61375-1 standard was researched in this article. The measurement index of MVB network dynamic performance including protocol efficiency, network efficiency, network utilization and network throughput was put forward and the relevant formula on the index was derived in the context. With a simulation example, impact of various communication medium and load on MVB network dynamic performance was evaluated and analyzed.关键词：train communication network;MVB;network dynamic performance;simulation
- 1080
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- 4
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- 0
发布时间：2021-12-13 - 摘要：Based on the detailed structural finite element model of a heavy electric locomotive cab, the natural frequency of cab structure was calculated and analyzed. The acoustic FEM was applied to simulate cavity acoustic modes, and sound pressure response of frequency range from 6.3 Hz to 200 Hz at sound field was given based on wheel-rail vertical random excitation. The results indicated that the natural frequency of cab structure was intensive, and mainly in low-frequency range below 80 Hz. For the present cab, zero-pressure section line of acoustic mode made driver’s ears under a small region of sound pressure amplitude in a wide range. The zero-pressure section line was offset slightly by wheel-rail vertical random excitation at speed 100 km/h. The noise characteristics of frequency range from 100 Hz to 200 Hz in cab were significantly improved by damping and sound-absorbing material.关键词：heavy electric locomotive;cab;acoustic-vibration characteristics;acoustic FEM;acoustic-vibration coupling
- 690
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- 2
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- 0
发布时间：2021-12-13 - 摘要：Based on high-speed and large-kinetic-energy characteristics of high-speed trains, a special passive protective end energyabsorbing structure was designed and simulated through non-linear finite element software LS-DYNA. The two-step energy-absorbing device fixed on the two cab end as well as low stiffness structure of car body rear end were studied and focused on the interface force, deformation and energy absorption capacity when a collision accident happened. It was proved that the two-step structure deformed orderly and had an energy absorbing capacity of 3.4 MJ, which could protect the cab effectively, and the rear end low stiffness zone had an energy-absorbing capacity of 6.5 MJ, which could protect the integrity of the passenger area. According to EN15227, a train-to-train crash scenario with a relative speed of 36 km/h was simulated and verified. It was proved that trains with energy-absorbing structure mentioned above could meet the need of EN15227 without climbing and damage of living space for both of drivers and passengers. Meanwhile, the average deceleration of the cab car was 4.4g.关键词：collision;passive safety;LS-DYNA;body design;energy-absorabing structure;high-speed train
- 1051
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- 2
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- 0
发布时间：2021-12-13 - 摘要：With modular design ideas, an integrated auxiliary power cabinet design scheme was proposed with auxiliary converter, battery charger, single-phase power supply and associated control circuit integration. Simulation model of the cabinet was established, and static structure strength and dynamics were analyzed, as well as experimental validation was put out, results of which showed that the integrated auxiliary power cabinet met the product design demand, solving problem of installation space limitation under the body with significant advantages in weight and volume.关键词：integrated auxiliary power cabinet;structure design;computer simulation;static inverter;insulated gate bipolar transistor
- 925
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- 2
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- 0
发布时间：2021-12-13 - 摘要：In order to increase fatigue strength of locomotive gearbox, dynamical characteristics of gearbox structure was analyzed based on finite-element modal analysis method. Previous structure weak area was found according to the modals and stress distribution of the structure in the analysis and the structure was improved. The improved gearbox had higher corresponding natural frequencies and higher structure strength and avoided shell resonance, which met safety service requirements. The numerical results are verified by experiment with good agreement.关键词：locomotive gearbox;gearbox crack;modal;fatigue strength;dynamical characteristics;structural improvement
- 822
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- 2
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- 0
发布时间：2021-12-13 - 摘要：Object of traction system safety design of mass transit vehicles was analyzed, as well as the design criterion was introduced. Overall design, hardware & software design on system safety design were proposed, as well as safety evaluation procedure.关键词：mass transit vehicles;traction system;safety;evaluation
- 996
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- 4
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- 0
发布时间：2021-12-13 - 摘要：With overall design ideas for crashworthy car body, referring to domestic and foreign crashworthiness design specifications and guidelines and combining with a certain inter-city EMUs, finite element models of inter-city EMUs head car collision were established by using explicit finite element software ANSYS/LS-DYNA, and numerical simulation of crash process was carried out. The result showed that the crashworthiness of this inter-city EMUs head car was consistent with requirement.关键词：inter-city EMUs;explicit finite element;head car;crashworthiness
- 468
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- 2
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- 0
发布时间：2021-12-13 - 摘要：Diesel shunting locomotive design scheme of Guangzhou metro line 4, which adopted linear motor firstly in China, was introduced simply. According to the special requirement of linear motor line, a series of particular design was applied for GCY-450 diesel shunting locomotive, which focused on boundary, bogie, reconnection function, traction and brake performance, coupler and so on.关键词：linear motor line;lateral pressure;GCY-450 diesel shunting locomotive;Guangzhou metro line 4
- 457
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- 2
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- 0
发布时间：2021-12-13 - 摘要：Power interruption and intermediate DC link voltage variation were analyzed in detail when metros passing no-electricity areas, and adaptive micro-brake technique for keeping the intermediate DC voltage steady were put forward. Corresponding application solutions was provided, effectivity and practicability of which was validated by experimental verification. The experimental results showed that the adaptive micro-brake technique met the requirements of domestic and foreign customers, and reached advanced level in the same industry.关键词：metro vehicle;no-electricity areas;adaptive micro-brake;intermediate DC link voltage
- 617
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- 2
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- 0
发布时间：2021-12-13 - 摘要：Parameters and performance requirement of energy-storage electric traction light-rail vehicle were introduced. T/B characteristic of electric traction system, simulation and calculation of vehicle operation capability, main circuit, control system and energy-storage management system of the vehicle were expounded. Moreover, energy-storage traction system of the vehicle was compared with traditional electric traction system. The vehicle has passed line routine test and type approval test, which satisfies design requirements.关键词：energy-storage;super-capacity;axle control;permanent synchronous motor;light-rail vehicle;straddle-type monorail vehicle;electric-driving system
- 1044
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- 7
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- 0
发布时间：2021-12-13 - 摘要：Based on SPMC75F2313 as control core, using hall sensor to sampling traction motor current in real-time, and with interpretation of the current bias and temporal scales, motor status was determined. When traction motor fault occurred, such as pinion loosening, shaft broken and so on, the monitoring device could accurately alarm and record the fault information, to remind attendants dealing with the fault for preventing accident spreading.关键词：SPMC75F2313;Hall sensor;gear loosening;traction motor;alarm
- 840
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- 2
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- 0
发布时间：2021-12-13 - 摘要：Dual net-interface card technology for solving LAN communication problems in inverter testing system was introduced in this paper. Replacing router by dual net-interface card, this method successfully achieved network communication among industrial control computer, control enclosure and measured DCU. Experiments results showed that with control enclosure and measured DCU installed service program, industrial control computer installed client program and IP addresses of dual net card configured in different network segments, data communication could be realize correctly. The technology has been applied in traction inverter measure system for Shenzhen metro line 5 vehicles.关键词：dual net-interface card;measure system;communication conflict;DCU;inverter
- 1023
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- 2
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- 0
发布时间：2021-12-13 - 摘要：Common localization technologies were introduced briefly, and localization technology based on RSSI applied in CC2431 was focused on. Process of constructing localization and information acquisition system based on WSN was described, which included design of WSN node adopted embedded technology, application development based on ZigBee protocol stack Z-stack and design of humancomputer interaction interface. Flow of data frame in protocol stack interacted in localization was analyzed emphatically. The results showed that the localization and information acquisition system could achieve real-time localization and meet the needs of monitoring of sensor data.关键词：wireless sensor networks;ZigBee;localization;received signal strength indicator;information acquisition
- 786
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- 2
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- 0
发布时间：2021-12-13
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