Inertia Matching During Dynamic Simulation of Vehicle Drive System on Test Bench

Framework and basic parameters of a test bench for motor drive system of electric vehicle (EV) are illuminated. Two kinds of electric drive models, one was for the electric vehicle drived on real road, the other was for that on test bench, are put forward. Then, dynamic analysis of these models is made in detail. Inertia matching method of the test bench is researched and some useful formulas and graphs are brought forward. The experiment of an electric bus is introduced in order to explain the usage of this inertia matching method.

Electronic Unit Pump Test Bench Development and Pump Properties Research

A unit pump test bench is developed on an in-line pump test platform. The bench is composed of pump adapting assembly, fuel supply subsystem, lubricating subsystem and a control unit. A crank angle domain injection control method is given out and the control accuracy can be 0.1° crank degree. The bench can test both mechanical unit pump and electronic unit pump. A test model-PLD12 electronic unit pump is tested. Full pump delivery map and some influence factors test is done. Experimental results show that the injection quantity is linear with the delivery angle. The quantity change rate is 15% when fuel temperature increases 30 ℃. The delivery quantity per cycle increases 30 mg at 28 V drive voltage. The average delivery difference for two same type pumps is 5 %. Test results show that the bench can be used for unit pump verification.

The Efficiency Improving of Traction Drive Test Bench with Supercapacitor Energy Storage System

For development of passenger electrical transport, it is necessary to use energy more rationally. One of methods of vehicle power efficiency increase is installation of on-board energy storage systems. For studying of system operation, it is necessary to carry out a lot of experiments, therefore it is favorable to use the test bench and its computer model for reduction of the number of physical experiments. In this article, the results of computer modeling for the optimization of traction drive test bench by adjusting of the operation parameters of supercapacitor energy storage are described. Test bench operation is considered in cases of the energy storage system working at various selected supercapacitor initial voltages. Maximal increase of possibility of vehicle test bench regenerative braking with minimal decrease of autonomous power supply mode possibility is investigated. There is estimated the energy storage system efficiency improving measures dependence from supercapacitor operational voltage ranges. Parameters at which the minimum losses of energy are observed are revealed. Dependence of energy storage system discharge power on the most admissible supercapacitor current is established.

Test Bench for Robotics and Autonomy： Overview and Test Results

In this paper, the TAS-I （Thales Alenia Space-Italy） Test Bench for Robotics and Autonomy （TBRA） is presented. It is based on a flexible and modular software architecture （Framework Engine）, in which each functional module （representing the GNC subsystems） implements a key functionality of the GNC （Guidance Navigation and Control）. Modules communicate by means of standardised interfaces designed for exchange of necessary information among the modules composing the entire system. This approach permits the interchange-ability of each subsystem without affecting the overall functionalities of the GNC system. In this paper, the TBRA system, together with the implemented functional modules will be described. Tests results will be reported and future development will be discussed.

A versatile test bench for photomultiplier tube characterization and its application in the DAMPE-PSD

Performance characterization for massive photomultiplier tubes(PMTs) is a frequently encountered procedure in large nuclear and particle experiments.To facilitate this work,a dedicated test bench system has been developed at the Institute of Modern Physics,Chinese Academy of Sciences.The two-dimensional photocathode position scanning capability is an intrinsic function of the test bench,and up to 25 PMTs,with the diameter smaller than 2",can be tested simultaneously.The parameters of the light source pulses can be adjusted in a wide range,thus making it suitable for various characteristics measurements.The test bench system is highly automated with all the controlling operations integrated into a single software.Additionally,the hardware platform is extensible which allows complex testing schemes,and the modularity in the software design makes the migration from one testing configuration to another light-weight and efficient.All these features make the test bench versatile and reusable in different experiments.It has been first used in the construction of the Plastic Scintillator Detector(PSD) of DArk Matter Particle Explorer(DAMPE),and a total of 570 Hamamatsu R4443 tubes were tested successfully.The performance was verified and the testing results are also reported in this article.

Laboratory Test Bench for Research Network and Cloud Computing

At present moment, there is a great interest in development of information systems operating in cloud infrastructures. Generally, many of tasks remain unresolved such as tasks of optimization of large databases in a hybrid cloud infrastructure, quality of service (QoS) at different levels of cloud services, dynamic control of distribution of cloud resources in application systems and many others. Research and development of new solutions can be limited in case of using emulators or international commercial cloud services, due to the closed architecture and limited opportunities for experimentation. Article provides answers to questions on the establishment of a pilot cloud practically “at home” with the ability to adjust the width of the emulation channel and delays in data transmission. It also describes architecture and configuration of the experimental setup. The proposed modular structure can be expanded by available computing power.

Research on cooling-temperature control strategy of fuel-cell engine test bench

As one of the important ways to utilize hydrogen energy,fuel cells are receiving more and more attention and research from countries and institutions.To meet the practical needs of testing the performance of high-power fuel-cell systems and simulate the actual application environment as much as possible,a fuel-cell system test bench is usually used to test the system performance,in which the cooling-temperature control of the test bench has a great impact on the results of the performance of the fuel-cell system.This paper studies the cooling-temperature control strategy of a 150-kW-class fuel-cell engine test platform,proposes a new test-bench cooling-system structure with a thermostat and heat exchanger as the main heat-dissipation components,and compares and analyzes the impact of coordinated thermostat and heat-exchanger control on the fuel-cell system test performance.The test results show that the control strategy of the coordinated operation of a thermostat and heat exchanger can maintain the steady-state error to within±0.3℃and maintain the temperature variation to within±1.5℃during the loading-condition test,so as to avoid the limitation of system output performance due to excessive cooling-temperature fluctuation and ensure that the fuel-cell engine performance-test process is carried out smoothly and efficiently.

Changes in coronary bifurcations after stent placement in the main vessel and balloon opening of stent cells:theory and practical verification on a bench-test model

Objective To describe changes that occur in stent morphology and structure after its implantation in coronary bifurcation.Side branch (SB) compromise after stenting of main vessel in coronary bifurcation is a major intraprocedural problem and for the long term,as a place of restenosis.Methods We created an elastic wall model (parent vessel diameter 3.5mm,daughter branches 3.5mm and 2.75mm)with 30,45 and 60 degree distal angulation between branches.After stent implantation,struts to the side branch were opened with 2.0mm and consequently 3.0mm diameter balloons.Subsequent balloon redilatations and kissing balloon inflations (KBI) were performed.All stages of the procedure were photographed with magnification up to 100 times.Results We found that the leading mechanism for side branch compromise was carina displacement,and discovered theoretical description for expected ostial stenosis severity.Based on our model we found that displacement of bifurcation flow divider cause SB stenosis with almost perfect coincidence with our theoretical predictions.Opening of stent cells through the proximal and distal stent struts always increased interslrut distance,but never achieved good apposition to the wall.Balloon diameter increase didn't give proportional enlargement in stent cell diameters.KBI leads to some small better stent positioning,correcting main vessel strut dislodgment from wall,but never gave full strut-wall contact.Distance between struts and wall was minimal only when the stent cell perfectly faced ostium of SB.This was also our observation that the shape of ostium of SB becomed eUiptically-bean shaped after stent implantation and generally kept that shape during consequent stages of experiment.Measured diameter and area stenosis were perfectly fitted and theoretically predicted from our concept Conclusion We have described stent-wall deformations in stent-balloon technique for treatment of coronary bifurcation demonstrating carina displacement as possibly main mechanism of side branch compromise after main vessel stenting.We have shown that KBI could not give full strut-wall contact if there is no perfect facing of stem cell and SB ostium.(J Geroatr Cardool 2008;5(1):43-49)

Bench Test Modeling for Current and Future PCMO Fuel Economy Requirements

The automotive and lubricant industries have been placing increased emphasis on the fuel economy benefits of today′s modern passenger car motor oils.The current ILSAC GF-4 specification has more stringent requirements than previous ILSAC specifications,and the proposed future ILSAC GF-5 specification is looking at further improvements in the lubricant′s fuel economy performance.To address these needs,Afton Chemical has developed correlations between the rheological and frictional properties of oils and fuel economy measured in engine and field tests.In this paper we will present correlations between lubricants′ physical properties and fuel economy measured in vehicles and engine tests.These tools have been used to develop current commercial oils which are being used extensively to meet today′s OEM needs.

高速列车轴箱轴承低频波动载荷加载装置

在高速列车运行过程中,复杂的轮轨关系等因素会使轴箱轴承承受宽频带的波动冲击载荷,导致滚子-滚道接触载荷大幅变化,加速轴承的磨损及疲劳失效。为在实验室环境中模拟轴箱轴承运用过程中承受的低频波动载荷,基于凸轮-弹簧机构设计、搭建了一种低频波动载荷加载装置并开发了相应的轴箱轴承试验台架,加载装置施加的低频波动载荷以及在波动加载工况下轴箱轴承内部动态载荷分布情况的试验结果表明,所设计的波动载荷加载装置能够对轴箱轴承施加给定幅值、频率的波动载荷,轴承承载区域滚子-滚道接触载荷的波动情况与轴承总外加载荷的波动情况一致,验证了该波动载荷加载装置的有效性和可行性。

High RF power tests of the first 1.3 GHz fundamental power coupler prototypes for the SHINE project

The Shanghai High Repetition Rate XFEL and Extreme Light Facility(SHINE)project will use 6001.3 GHz fundamental power couplers,which are modified based on TTF-Ⅲ power couplers,for continuous-wave operation with input power up to approximately 7 kW.The first batch of 20 sets of 1.3 GHz coupler prototypes was fabricated from three domestic manufacturers for the SHINE project.To better characterize the radio frequency conditioning phenomena for validating the performance of power couplers,a room temperature test stand was designed,constructed,and commissioned for the SHINE 1.3 GHz power couplers.In addition,a horizontal test cryostat was built to test the 1.3 GHz superconducting cavities,fundamental power couplers,tuners,and other components as a set.The results of these tests indicate that the 1.3 GHz couplers are capable of handling up to 14 kW continuous waves.Herein,the main aspects of the radio frequency design and construction of the test stand,along with the test results of the high-power conditioning of the 1.3 GHz couplers,are described.

Gas Bench Ⅱ-IRMS磷酸法在线测定水中溶解无机碳碳同位素分析条件及影响因素

采用Gas Bench Ⅱ-IRMS对水中溶解无机碳碳同位素在线测定影响因素进行研究,确立了分析方法。通过对影响因素的研究确定了水中溶解无机碳碳同位素测试的最佳平衡时间;样品水中溶解无机碳浓度与样品测试的信号强度呈明显正相关;测试过程中色谱柱温度的高低不仅会影响样品峰的出峰时间,还会影响样品峰宽、峰高及峰积分面积等,影响最终测试结果。为了确保水中溶解无机碳碳同位素测试方法的准确性与可行性,进行了方法试验验证,水中溶解无机碳碳同位素比值(δ^(13)C)的测定值与验证单位给出的δ^(13)C测定值相一致,此测试方法具有可行性。在线测试的高效率和小样量与传统方法比较有显著优势,这为拓展同位素分析技术的应用领域提供了一种快速、高效的手段。本测试分析方法适用于地下水、地表水、大气降水的溶解无机碳碳同位素组成的在线测定。

伺服电机驱动变量柱塞泵试验台研发

针对伺服电机驱动变量柱塞泵的控制研究,对相关试验平台进行设计,根据控制方案对液压系统和电气系统硬件进行了搭建;利用PLC编程软件,开发了用于控制输出的程序以及用于部分传感器数据采集的程序。同时,在LabVIEW平台上编写了包括控制逻辑、PID控制算法以及数据采集的程序,形成了适用于试验平台的上位机用户界面。通过OPC通信协议实现了PLC与LabVIEW之间的数据交互,确保了控制系统的完整性和协同工作能力。

Experimental Tests of the Operating Conditions of a Micro Gas Turbine Device

The aim of this work is to analyze the performance of a commercial micro gas turbine, focusing on the analysis of the fuel consumption and the outlet compressor and turbine temperature at various rpm, and to evaluate and compare the efficiency of the device. A test bench has been assembled with the available equipment in the laboratory of the department of mechanical and aerospace engineering in Roma. By using the software supplied by the manufacturer, the evaluation of the operating performance of the device at different speeds has been performed, obtaining all the values of interest.

重型轨道工程车换向箱故障诊断研究

换向箱是轨道工程车的重要组成部分。由于长期处于高转速、大负荷的工作环境,其易受到损伤并发生故障。因此,对轨道工程车换向箱进行准确有效的故障诊断具有重要意义。针对实际运行中导致车辆产生异响问题的换向箱进行厂内台架最高运行速度试验,并通过振动监测及频谱分析发现齿轮啮合频率附近出现以Ⅲ轴和Ⅳ轴转轴回转频率为特征的旁频,同时换向箱齿轮啮合频率2倍谐频显著高于啮合基频,因此确定换向箱Ⅲ轴和Ⅳ轴齿轮故障是造成车辆振动过大的主要原因。在更换Ⅲ轴和Ⅳ轴齿轮后,换向箱振动RMS值由8.53 g降低至3.20 g,成功消除车辆异响。该研究成果对于推动轨道工程车传动系统试验台发展及推进故障监测诊断技术应用具有重要意义。

Electronics Workbench——“计算机里的电子实验室”

文章介绍了EWB充当电子实验室虚拟试验平台所具有的重要意义,并通过其在电工、数字电子技术、模拟电子技术实验中的相关应用,举例对上述观点加以验证。

GYK-160型轨道车运控设备智能综合测试台的设计和实现

为满足GYK-160型轨道车运行控制设备检测维修保障的迫切需求,在综合分析GYK-160型轨道车运行控制设备的组成、设计原理和功能的基础上,设计GYK-160型轨道车运行控制设备智能综合测试台。该测试台采用模拟仿真技术,并集成多种仪器仪表,能够模拟被测设备的外部运行条件或环境,支持多类型被测对象的测试、分析与诊断,可实现GYK-160型轨道车运行控制设备的单板卡、单元、整机级功能测试。搭建测试环境对该测试台进行验证,结果表明:该测试台可实现对GYK-160型轨道车运行控制设备功能的自动化测试,有助于提高设备维护检修的工作效率,满足测试数据报表的数字化管理需求,具有较高的应用价值。

Design and Experiment of Electronic-hydraulic Loading Test-bed Based on Tractor's Hydraulic Steering By-wire

An Electro-hydraulic loading system is designed based on a test-bed of tractor's hydraulic steering by-wire. To simulate the steering resistance driving tractor in many kinds of soils and roads,the loading force is controlled to make proportional and continuous variable by an electro-hydraulic proportional relief valve. A steering resistance loading test-bed is built to test three kinds of steering resistance including constant,step and sine style. Tire lateral resistance is also tested under different steering conditions. The result shows that the electro-hydraulic loading system has high stability and following performance. Besides,the system's steady state error is lower than 3. 1%,and it meets the test requirement of tractor's hydraulic steering by-wire.

Design and testing of an internal hot-cathode-type PIG ion source for superconducting cyclotron

The superconducting cyclotron SC200 is intended to generate a 200 MeV, 400 nA proton beam for future particle therapy. The internal hot-cathode-type Penning ionization gauge (PIG) ion source for the SC200 is designed for the generation of hydrogen ions. A brief description of the design of ion source and test bench, which are used in SC200, is given in this paper. The ion source has been verified on the test bench, and the results indicated that the designed ion source meets the expected requirements. The lifetime of the filament exceeded 100 h in the test. In addition, the extraction voltage and the gas flow that influence the extracted ion current intensity have been tested in the experiment.

基于用户需求导向的智能座舱柔性试验台概念设计集成方法

为解决传统座舱试验台结构同质化及模块化设计不足等问题,采用亲和图法整理了汽车故障及用户初始需求;采用模糊Kano模型进行需求指标权重计算,并结合质量特性要素进行用户核心需求汇总;通过功能分析系统技术(Function Analysis System Technique,FAST)黑箱模型将用户需求转化为功能需求,并引入公理设计(Axiomatic Design,AD)理论与功能-行为-结构(Function-Behavior-Structure,FBS)模型进行逐级映射,最终确定智能座舱柔性试验台的结构设计要素。该设计过程以用户核心需求为导向,通过FAST-AD-FBS集成方法的应用,克服了传统产品概念设计中用户需求与产品功能结构设计间存在矛盾的问题,为提高产品创新设计的完整性及准确性提供了理论参考。