Test Analysis of Traction Battery Peak Power

The test process of electric vehicles (EVs) traction battery peak power is analyzed in detail. Aimed at a special “traction” design of versatile battery—HORIZON~ C~2M Battery, the features are introduced. According to the peak power test schedule, the test parameters of HORIZON~ C~2M Battery are calculated and the charging and discharging experiments are carried out. The sustained (30 s) discharge power capability of battery at 2/3 of its open circuit voltage at each of various depths of discharge is determined. The dynamic internal resistance under peak power test is established. Considering the temperature impact during discharging, the peak power capability at each of various depths of discharge is corrected. The correctness of peak power test is validated by combining theory analysis with test results.

Performance study of combined test rig for metro train traction

This paper deals with a combined test rig for a traction system in the laboratory environment.An experimental system was designed and implemented to verify the performance of the traction system for a metro train.For a highly accurate control of the system,a hybrid control algorithm combining vector control and slip frequency control was applied to control the traction inverter.The design method of the flywheels,which represent the equivalent model of the train moment inertia,was elaborated.A train runtime diagnosis system was completed by adopting the multifunction vehicle bus（MVB） protocol.The dynamic performance of the metro power traction system was emulated under the control of the train runtime diagnosis system.Using the combined test rig,the performances of the traction system in traction,braking,temperature rise,etc.,were verified through traction and breaking experiments.

Improved fault location method for AT traction power network based on EMU load test

The autotransformer(AT)neutral current ratio method is widely used for fault location in the AT traction power network.With the development of high-speed electrified railways,a large number of data show that the relation between the AT neutral current ratio and the distance from the beginning of the fault AT section to the fault point(Q-L relation)is mostly nonlinear.Therefore,the linear Q-L relation in the traditional fault location method always leads to large errors.To solve this problem,a large number of load-related current data that can be used to describe the Q-L relation are obtained through the load test of the electric multiple unit(EMU).Thus,an improved fault location method based on the back propagation(BP)neural network is proposed in this paper.On this basis,a comparison between the improved method and the traditional method shows that the maximum absolute error and the average absolute error of the improved method are 0.651 km and 0.334 km lower than those of the traditional method,respectively,which demonstrates that the improved method can effectively eliminate the influence of nonlinear factors and greatly improve the accuracy of fault location for the AT traction power network.Finally,combined with a shortcircuit test,the accuracy of the improved method is verified.

Study of Traction Motor Feedback Testing SystemControlled by Microcomputer

this paper describes the design of a feedback testing system for locomtive tractionmotor. The structures and features of the software and hardware of themicrocomputer control system have been studied. This testing system hasalready been put into operation successfully in several locomotive depots inChina.

机械变速拖拉机牵引试验特性研究和分析

牵引试验是农业拖拉机试验鉴定中最重要的试验之一,且牵引功率是衡量拖拉机动力性能和经济效益的重要技术指标。为此,对不同档位下拖拉机行驶速度、牵引功率、牵引力和滑转率等参数进行测量,结合测量得到的数据结果绘制参数关系曲线图,分别绘制了牵引力和行驶速度、牵引功率和行驶速度、牵引力和驱动轮滑转率、牵引功率和牵引比油耗的曲线变化图。同时,运用数学运算得出各参数间一次线性和二次多项式的拟合方程,对比决定系数R2值,得出最真实的回归方程。试验结果表明:得出的回归方程对研究农业拖拉机牵引功率试验有一定的指导和应用价值,可对牵引功率试验中的测量参数进行提前预测。

Experimental research on grouser traction of deep-sea mining machine

The traction characteristics of the grouser, cutting the simulative soil of deepsea sediment, with different tooth widths, tooth heights, and ground pressures are studied with traction characteristic test apparatus. A traction-displacement model is obtained by combining the analysis of the cutting mechanism. The results show that the tractiondisplacement curves of grousers with different tooth widths, tooth heights, and ground pressures have the same changing trend, which matches the Wong traction model. Their sensitivity coefficient and shear modulus are slightly fluctuated. Therefore, the average values can be used as the traction model parameters. The maximum traction of the grouser with a two-side edge and a 10 mm tooth width increment changing with the tooth height and ground pressure can be determined according to the grousers with different tooth widths. By combining the traction model parameters, the traction-displacement curve of the grouser with a certain group values of tooth width, tooth height, and ground pressure can be predicted. Therefore, the slip of the mining machine can be prevented to improve the mining efficiency.

Quantitative analysis on coupling of traction current into cab signaling in electrified railways

Cab signaling apparatus is the critical equipment for ground-vehicle communication in electrified railways.With the rapid development of high-speed and heavy-haul railways,the immunity to unbalanced traction current interference for cab signaling apparatus in the onboard train control system is increasingly demanded.This paper analyzes the interference coupling mechanism of the ZPW-2000 track circuit.Based on electromagnetic field theory and the actual working parameters,a calculation model is established to complete the quantitative research of the cab signal induction process and traction current interference.Then,a finite element model is built to simulate the process.The simulation results under the signal frequency,fundamental and harmonic interference are all consistent with the theoretical calculation results.The practical measurement data verify the coupling relationship between cab signal inductive voltage and rail current.Finally,an indirect immunity test method applying this relation for the cab signals is proposed,and the voltage indexes of the disturbance sources are determined,i.e.,the test limits.The results provide an accurate quantitative basis for the cab signaling research and design of the immunity test platform;besides,the proposed indirect test method can simplify the test configuration and improve test efficiency.

地铁列车概念车性能模拟及特殊工况仿真计算软件在试车线长度计算中的应用

中铁二院开发的地铁列车概念车性能模拟及特殊工况仿真计算软件,可根据地铁车辆基本参数、牵引及制动特性,建立地铁列车概念车牵引计算模型,对地铁列车概念车其余特性曲线进行计算,验证拟选用的车辆能否匹配当前线路及运营要求。试车线是地铁列车进行动态调试和试验的线路,试车线设计应尽可能满足车辆最高运行速度的试车需求。该文利用该软件,计算80 km/h时速及100 km/h时速地铁列车空载AW0工况在不同档位试车速度下试车线长度,并给出试车线长度建议方案。

土壤对军用越野车辆机动性能影响分析

在软地面上的机动性能是军用高机动性越野车辆的主要性能之一,对于其野外作业有重要的战略意义。为了探究不同类型松软土壤地面路况对越野车辆机动性能的影响,基于离散元法对土壤进行建模,通过土壤堆积角测试试验以及土壤圆锥指数试验进行土壤刚度对标测试。通过DEM-MBD联合仿真方法,利用精确的土壤模型,对不可压缩干燥土壤、不可压缩湿润土壤、可压缩干燥土壤、可压缩湿润土壤4种不同类型土壤进行仿真分析,通过对比越野车辆平均速度、牵引力、驱动扭矩、轮胎沉陷量,探究土壤类型对越野车辆机动性能的影响。越野车在湿润土壤上比在干燥土壤上牵引力减少了6.98%,在不可压缩土壤上的稳定行驶速度比在可压缩土壤上稳定行驶速度高34.2%,在湿润的土壤路面上速度更加稳定。研究成果弥补了国内车辆地面力学领域土壤对整车机动性影响的空白,可为军车野外复杂地形(如沙地、雪地、泥泞等)作战时选择最优的行驶路面,提高作战效率。

牵引电机空载声品质预测模型研究

为建立一款牵引电机空载条件下的声品质预测模型,首先开展了电机空载时多个转速下不同位置处的噪声测试,获得了响度、尖锐度、粗糙度和抖动度等声品质客观参数,并分析了各声品质客观参数随转速的变化规律;然后采用等级评分法对40个声样本开展了主观评价,采用箱线图剔除异常数据,获得各个声样本主观评价平均分;最后分别采用多元线性回归法和代理模型法建立了电机声品质预测模型。后者相比前者预测精度更高,该方法和研究结果可以为后续电机声品质优化工作提供参考。

基于《道路车辆牵引座强度试验》标准的牵引座疲劳强度分析方法研究

文章提出一种有限元仿真及经典疲劳强度公式分析相结合的方法,对某牵引座结构进行疲劳强度校核。按照GB/T 20069-2006《道路车辆牵引座强度试验》标准相关要求,建立某牵引座动态试验有限元仿真模型,计算得到牵引座结构应力危险点在一个加载循环周期内的应力。按照经典疲劳强度公式校核牵引座的疲劳安全,并对牵引座进行动态疲劳试验验证。结果表明,牵引座疲劳安全满足使用要求,验证了该分析方法的有效性。

机车牵引电机转子模态试验及仿真优化研究

牵引电机转子作为电机旋转的核心,转子的固有频率应避开实际的工作频率、工作转速。基于软件的有限元分析法是目前在设计阶段应用最广泛的固有频率计算方法,而影响计算结果准确性包括材料参数、各部件间的实际接触状态等。通过LMS公司的采集系统进行实际模态测试,并采用Ansys的有限元分析法,考虑导条和端环、导条和铁心、铁心和转轴实际接触状态计算转子的固有频率。根据实际模态测试结果,以验证Ansys计算结果的实效性,为进一步提高牵引电机转子模态仿真精度提供有益参考,也为进一步改进转子结构,保证转子在实际运行中不会发生共振提供依据。

高原双源动力集中动车组内燃车牵引变流器关键技术分析与验证

针对高原型内燃机车运行海拔高、散热工况复杂和轻量化要求高的特点,文章介绍了一种复兴号高原双源动力集中动车组内燃车牵引变流器的主电路结构、工作原理及其设计方法。对于运行海拔高的特点,使用海拔修正的方法对柜内电气绝缘性能进行加强;对于散热工况复杂的特点,选择合理的冷却方案,并对整柜的损耗和散热能力进行精细化热设计,确保其散热能力;对于轻量化要求高的特点,使用模块化布局和有限元结构仿真的方法,在保证结构强度的同时实现轻量化设计。试验表明,牵引变流器能满足各项性能指标要求。

缩短牵引变压器试验时间策略的研究

牵引变压器是牵引供电系统的“心脏”其工作性功能的好坏直接关系到整个牵引供电工况。按照牵引变压器试验规程要求开展变压器周期试验,不同试验项目需要使用不同规格的测试线,现场测试线多,难于整理,接线复杂,影响试验效率。本文通过调查研究变压器试验过程各环节耗时情况,查找变压器试验时间长的问题根源,并给出了提高变压器试验效率的方法以及相应的对策。

Analysis of the Characteristics of Materials Obtained by Recycling Scrap Metal in Guinea

The aim of this study was to determine the quality of rebar produced from recycled scrap metal collected throughout the country,and imported rebar sold in the Republic of Guinea.To do this,the samples were subjected to various mechanical tests involving traction,bending and microscopic analysis.In the Lambanyi and Casse Sonfonia samples,all the tensile strength values for diameters 12,14 and 16 were above 550 MPa.Conversely,the iron samples from Baillobaye and the 10 mm diameters of the samples from Casse Sonfonio and Lambanyi have less appreciable values.The limits of elasticity were determined.The various values found vary more or less from the conventional yield strength of the NF A35-016 reference supplied by CBITEC,which is 500 MPa.Microscopic analysis gives us an insight into the internal structure of the iron samples used.This study may provide the company and the vendors with an alternative for their improvements.

内燃动车组牵引用异步发电机控制系统研究

目前内燃动车组牵引用主发电机多采用同步发电机,通过调节励磁电流进行发电机输出电压的调节。同等功率下,异步发电机具有结构简单、体积小、质量轻、可靠性高等优点。文章介绍了内燃动车组牵引用异步发电机控制原理,对发电控制系统进行了仿真,通过搭建小功率异步发电机试验平台对发电控制进行了验证。

电动车组牵引电动机振动加速度载荷试验谱编制

以某型高速电动车组牵引电动机为研究对象,经线路测试得到牵引电动机各向加速度时域载荷,对其进行傅里叶变换得到加速度功率谱密度,将加速度功率谱密度值输入振动试验台,模拟得到振动试验台输入加速度时域载荷。对比分析线路测试得到的加速度时域载荷与振动试验台输入加速度时域载荷的差异,利用雨流计数法对时域载荷循环计数并编制加速度载荷幅值谱,并定义2种时域载荷的相对疲劳损伤比,最终基于疲劳损伤一致性理论进行修正,得到加速度载荷试验谱。研究结果可为高速电动车组牵引电动机的优化设计和寿命评估提供参考,为制定产品相关试验标准提供理论支撑。

高寒动车组牵引变流器的振动测试及分析

针对我国西北部地区恶劣天气和老化线路影响高寒动车组安全可靠运行的问题,开展实际线路运行时振动测试及分析。根据即墨至乌鲁木齐的车辆运行速度和地形特征,划分青岛—济南、济南—西安、西安—兰州、兰州—乌鲁木齐4个区间,对比分析不同区间内的振动有效值。结合IEC 61373标准,对比分析实测振动有效值、冲击峰值与标准值的差异。通过振动频谱分析牵引变流器不同部件的振动特性,利用统计容差法编制不同部件的实测载荷谱,并利用有限元方法分析中频和高频振动对牵引变流器结构的影响。结果表明,济南—西安区间内的振动高于其他区间,西安—兰州区间内的冲击高于其他区间;柜体吊耳和控制箱的振动主要体现在垂向与纵向,而横向较小,且以中频段和低频段为主;冷却风机的振动集中在低频段,来自于风机转频;功率模块振动以横向和纵向为主,中频段和高频段的振动远大于低频段。

基于AGV转运的牵引电机支撑试验台位设计与实验

为了解决试验站物流转运效率低下问题,设计了适应背驮式AGV的托盘式支撑结构,应用仿真分析和共振频率分析方法进行可行性分析,搭建实验平台进行结构验证。分析及实验表明,该支撑结构能够满足电机例行试验要求。

电动牵引治疗腰椎间盘突出症时牵引重量的选择观察

目的:探讨以患者体重作为基础选择电动牵引治疗腰椎间盘突出症时的牵引重量。方法:选取2019年6月—2020年5月重庆市沙坪坝区中医院收治的45例电动腰椎牵引治疗的腰椎间盘突出症患者作为研究对象,分别以患者体重重量、体重+10 kg重量和体重+20 kg重量进行牵引治疗,牵引过程中拍摄相同条件的X线片。比较患者牵引前、体重重量牵引、体重+10 kg重量牵引和体重+20 kg重量牵引L_(3~4)、L_(4~5)、L_(5)~S_(1)椎间隙高度、直腿抬高试验转阴情况及持续3 min以上人数。结果:三种重量牵引L_(3~4)、L_(4~5)、L_(5)~S_(1)椎间隙高度较牵引前均增大,差异有统计学意义(P<0.05);体重+10 kg重量牵引L_(3~4)、L_(4~5)、L_(5)~S_(1)椎间隙高度优于体重重量牵引,差异有统计学意义(P<0.05);体重+20 kg重量牵引L_(3~4)、L_(4~5)椎间隙高度优于体重重量牵引,差异有统计学意义(P<0.05)。体重+10 kg重量和体重+20 kg重量牵引过程中患者直腿抬高试验转阴率高于体重重量牵引,体重+20 kg重量牵引时不能耐受3 min以上持续牵引的人数多于体重+10 kg重量和体重重量牵引,差异有统计学意义(P<0.05)。结论:建议电动腰椎牵引治疗腰椎间盘突出症时,牵引重量设定在患者体重+10 kg重量左右,多数患者能耐受这个牵引重量,临床效果优于体重重量和体重+20 kg重量的牵引。