基于MMS模型的继电保护装置自动测试技术研究

提出一种基于MMS模型的继电保护装置自动测试技术,该技术能够自动模拟继电保护装置的输入信息,自动验证输出信息,通过MMS报文读写保护装置的定值、控制字、软压板,针对各厂家“六统一”保护型号功能配置,建立典型测试模板库,实现继电保护装置一键式测试,并通过中间模型文件解决了不同厂家的保护装置数据输出端口信息描述不统一的问题,实现模型自动映射。最后以某型号线路保护装置测试为例验证所提方法的可行性。

基于MMS仿真的智能变电站调试技术研究

智能变电站间隔层设备与监控后台、远动网关机采用IEC 61850 MMS模型及协议进行通信,具有信息模型复杂、服务内容繁多,存在MMS信息量大和调试效率低等问题。提出基于MMS仿真的智能站调试技术,研究MMS数据源的通信和服务仿真,并开发MMS仿真调试系统。模拟MMS客户端对下实现对站控层设备信息的监视与查看,模拟MMS服务端对上将保护、测控信息上送至监控主站,响应主站命令,基于MMS仿真实现MMS通信异常调试、保护信息调试、调控主站对点调试和闭环自动测试。经技术实际应用表明该技术可有效提高智能变电站MMS信息调试效率,保障智能变电站按时可靠投运。

Adaptive Signal Conditioning Technology in Fighter Weapon System Test

In order to realize the real-time and precise test for a weapon system of a certain type of fighter,a signal classification method according to attributes is proposed,common input channels for multiple signals are configured optimally,and a test adapter and an adaptive signal conditioning module is designed. The hardware of conditioning module can be configured flexibly and the programmable test range can be adjusted owing to programmable multiplexer. An FPGA adaptive filter is designed by the calculated filter coefficient vectors with LMS method to solve the problem of parallel test of fighter weapon system in electromagnetic interference environment. The adaptive signal conditioning technology is characterized by high efficiency,precision and integration. Its application makes the test system successful to conduct real-time and parallel test for a weapon system,which is developed based on VXI bus and virtual-instrument technology.

基于MMS-EASE的智能装置ACSI服务的一致性测试软件实现

智能装置的ACSI服务以MMS协议形式向客户发布,MMS-EASE开发包提供了MVL编程框架,客户基于该框架生成MMS协议请求报文对智能装置的ACSI服务进行调用,获取智能装置的响应报文,对智能装置ACSI服务与IEC61850标准的一致性进行测试。以智能装置中DataSet的GetDataSetValues服务为例详细讲解了编写代码的过程,在对IEC61850标准中ACSI到MMS协议之间映射进行分析的基础上,介绍了如何基于MMS-EASE开发包编程对智能装置ACSI服务进行一致性测试,最后提出了一种利用QtScript模块将一致性测试软件脚本化的方法,用以提高测试效率。

Degradation of differently processed Mg-based implants leads to distinct foreign body reactions(FBRs)through dissimilar signaling pathways

Mg alloys have mechanical properties compatible with human bones.However,their rapid degradation and associated foreign body reactions in vivo significantly limit their application for human implants.In this study,three differently processed Mg alloys,pure Mg(PM),cold extruded Mg alloy AZ31(CE AZ31),and fully annealed AZ31 Mg alloy(FA AZ31)were comparatively investigated for their potential as implants using a rat model.All three implanted Mg alloys do not show any impact on hepato-and renal function,nor any signs of observable changes to vital organs.Proteomics analysis of tissues directly contacting the implants 2.5 months post implantation revealed that FA AZ31 activates very few inflammation and immune associated signaling pathways;while the CE AZ31 and PM produce more significant inflammatory responses as confirmed by cytokine array analyses.Further,FA AZ31 activated pathways for cell organization and development that may improve the recovery of injured tissues.Structurally,EBSD analysis reveals that the FA AZ31 alloy has a higher ratio of first-order pyramidal orientated(10–11){10–1–2}grain texture with a value of 0.25,while PM and CE AZ31 alloys have lower ratios of first-order pyramidal orientated texture with the values of 0.16 and 0.17,respectively.This is associated with recovery and recrystallisation during annealing which promotes grain texture which exhibits enhanced degradation behaviours and induces a more limited immune response in vivo.In conclusion,the FA AZ31 demonstrated better biocompatibility and corrosion resistance and is a promising candidate for metal-based degradable implants which warrants further investigation.

基于IEC61850的MMS通信仿真测试系统的研究与实现

基于IEC 61850标准设计了基于IEC61850 MMS通信的仿真测试系统,实现了IEC 61850服务器通信模块的仿真,对下通过与过程层设备通信实现交流量(SMV)数据的采集和控制量(GOOSE)数据的交互,对上通过IEC 61850服务器通信模块将四遥信息及时向监控后台的上传,同时实时响应监控后台的各种命令,实现了全站各数字化装置的仿真,对智能变电站技术的研究和工程测试联调发挥了重要作用,文中详细介绍了站控层仿真测试系统的设计原理和体系架构,并对各个功能模块的实现进行详细的阐述,对其应用场景和实际使用效果也进行了详实描述。

基于云策略和MMS协议的智能变电站继电保护设备自动测试系统

针对部分继电保护装置检测过程存在需要大量人力、测试时间长、准确性差等问题,研究了一套智能变电站继电保护设备自动测试系统。在测试系统中引入云存储和物联网标签技术,智能获取待测保护装置的相关参数,自动生成测试列表。同时将MMS协议集成在测试系统中,可实现测试过程中的实时自动读写保护装置定值、设置测试参数、投退装置软压板来配合当前的测试项目,并自动完成整个测试过程。该系统在整体提升二次系统安全性的同时,可以避免人力、物力的浪费,有效提升实验室检测效率以及现场调试效率,减少基建、检修阶段的时间和开支,对智能变电站的推广应用具有十分重要的意义。

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.

移动终端MMS一致性测试研究

对移动终端MMS业务一致性测试进行了介绍,阐述了测试系统的架构以及具体的测试内容和方法,并对目前常见的测试问题进行了总结和分析。

移动终端MMS业务一致性测试介绍与分析

本文首先对MMS业务进行了简要介绍,并阐述了一致性测试的原理,指出了一致性测试的重要性,然后介绍了移动终端MMS业务一致性测试内容及方法,具体包括其标准、系统及设备、测试条件,对主要测试内容进行了分析,然后简述了目前的移动终端MMS业务一致性测试的现状,最后指出了业务一致性测试的重要性。

MAPOD Analysis in Eddy Current Testing of Flaws Considering Multiple Response Signals and Multiple Flaw Parameters

The reliability of the eddy current testing (ECT) in flaw detection is quantitatively evaluated by theprobability of detection (POD). Precise and efficient modeling of POD gives direction for the implement of ECTon sites to avoid false or missing flaw detection. Traditional POD analysis focuses on single uncertain factor orsingle response signal with limited credibility in engineering. This paper considers multiple response signals andmultiple flaw parameters to perform POD. The flaw length, the flaw depth, the coil impedance, and the magneticflux density are comprehensively studied under various lift-off distances. A finite element model (FEM) of ECT isestablished and verified with experiments to obtain sufficient simulation data for discrete POD modeling. Thecontinuous POD function is then fitted based on the discrete values to show the superiority of integrating multiplefactors. A comparison with conventional POD analysis further demonstrates the higher reliability of ECT flawdetection considering multiple flaw parameters and multiple response signals, especially for small flaws.

Wireless distributed test system based on transient pressure signal detection and recognition

During the test on transient pressure signal in explosion field,false trigger caused by field interference can lead to test failure.To improve the stability of test system,a signal detection and recognition technology is proposed for transient pressure test system.In the process of signal acquisition,firstly,electrical levels are monitored in real time to find effective abrupt changes and mark them;then the effective data segments are detecdted totected;thus the effective signals can be acquired in turn finally.The experimental results show that the shock wave signal can be collected effectively and the reliability of the test system can be improved after removal of interferences.

Design and implementation of configurable parameters test system for transient pressure measurement

For the shock wave overpressure signal measurement of explosion field, the type and equivalent of the ammunition as well as the distance from test nodes to ground zero have a great influence on the characteristics of shock wave signal. To ensure that shock wave signal with different characteristic parameters can be collected completely in the test of shooting range, a tran- sient pressure signal storage system with configurable parameters is presented. In order to meet the requirements of different test nodes, the system can set parameters of all test nodes by wireless communication in explosion field. The feasibility and re- liability of the system are fully verified through transient pressure measurement in explosion field.

Development and Testing of an Automatic Turning Movement Identification System at Signalized Intersections

Vehicle turning movement data from signalized intersections is utilized for numerous applications in the field of transportation. Such applications include real-time adaptive signal control, dynamic traffic assignment, and traffic demand estimation. However, it is very time consuming and costly to obtain vehicle turning movement information manually. Previous efforts to simplify this process were focused on solving the problem using an O-D matrix, but this method proved to be inaccurate and unreliable with the existing data acquisition system. Another study involved the identification of vehicle turning movements from the detector information, but the presence of shared lanes led to uncertainties in vehicle matching, thus limiting application of the method only to intersections without shared lanes. In light of those unsuccessful attempts, this paper develops and tests a system called the Automatic Turning Movement Identification System (ATMIS), which estimates vehicle turning movements at a signalized intersection in real time, regardless of its geometry. The results from lab experiments as well as a field test show that the algorithm is very promising and may potentially be expanded for field applications.

Research on A Checking Method of Vibration Characteristics for Test System

To ensure the accuracy and precision of vibration test,a universal checking method is proposed.The use of the method is discussed and an actual example is given.First,the calibration of the 7703A-500 type sensor is analyzed on the basis of frequency response method.The frequency range of normal working can be determined by the exact calibration of sensitivity,frequency response and linearity.For the basic problem of abnormal signals appearing in test system,the method of zero check and loading vibration source are developed.The frequency spectrum of output signals is employed to distinguish the noise signal,unknown source signal and useful signal effectively.Finally,the experimental results reveal the importance to improve the accuracy of the results of practical vibration test.

A Point-of-Care Test System for Biochemical Blood Analysis Based on ADUC824

A point-of-care test system has been studied in this paper.It was used to determine substances in blood such as Hemoglobin (HB),Aspartate Aminotransferase (AST),Creatine Kinase (CK) and so on.Based on the principle of amperometric determination,the research on detecting weak current signals was carried on.At the same time as to the weak signals (nA level),magnifying,sampling and processing the signals were also studied.Controlled by ADUC824 and assisted by other units, every substance could be determined automatically and rapidly integrated with the corresponding biosensor.In the experiment, the minimum detectable current of the instrument (YT2005-1) is 0.2 nA.With regard to the 1 nA which the experiment demanded,it could be up to the mustard.And the system can provide results in 180 s with a long term stability.

Wigner-Matrix-Based Normality Test and Application to Weak Signal Detection in SISO/SIMO Systems

Based on the asymptotic spectral distribution of Wigner matrices, a new normality test method is proposed via reforming the white noise sequence. In this work, the asymptotic cumulative distribution function （CDF） of eigenvalues of the Wigner matrix is deduced. A numerical Kullback-Leibler divergence of the empiric-d spectral CDF based on test samples from the deduced asymptotic CDF is established, which is treated as the test statistic. For validating the superiority of our proposed normality test, we apply the method to weak SIPSK signal detection in the single-input single-output （SISO） system and the single-input multiple-output （SIMO） system. By comparing with other common normality tests and the existing signal detection methods, simulation results show that the proposed method is superior and robust.

Design of EPS Testing System Based on LabVIEW2012

The article designed a set of automatic test system of automobiles EPS based on LabVIEW, which can collect current signal and torque signal when emergency braking. It consists of two parts： hardware and software. Hardware includes sensors,condition circuits, data acquisition card and your computer. Software-related programs, including an analysis of acquisition signal processing and storage display.The system is stable and reliable by contrast verification.

Fatigue test loading methodfor wagon body basedon measured load

Purpose–In this paper,the C80 special coal gondola car was taken as the subject,and the load test data of the car body at the center plate,side bearing and coupler measured on the dedicated line were broken down to generate the random load component spectrums of the car body under five working conditions,namely expansion,bouncing,rolling,torsion and pitching according to the typical motion attitude of the car body.Design/methodology/approach–On the basis of processing the measured load data,the random load component spectrums were equivalently converted into sinusoidal load component spectrums for bench test based on the principle of pseudo-damage equivalence of load.Relying on the fatigue and vibration test bench of the whole railway wagon,by taking each sinusoidal load component spectrum as the simulation target,the time waveform replication(TWR)iteration technology was adopted to create the drive signal of each loading actuator required for the fatigue test of car body on the bench,and the drive signal was corrected based on the equivalence principle of measured stress fatigue damage to obtain the fatigue test loads of car body under various typical working conditions.Findings–The fatigue test results on the test bench were substantially close to the measured test results on the line.According to the results,the relative error between the fatigue damage of the car body on the test bench and the measured damage on the line was within the range of
16.03%–27.14%.Originality/value–The bench test results basically reproduced the fatigue damage of the key parts of the car body on the line.

复杂电能信号谐波时频域特征分析及其对电能计量影响

为准确分析复杂电能信号谐波时频域特性对电能计量的影响,提出了一种零值搜索-短时傅里叶变换时频域电压、电流信号幅度和相位分析算法,利用信号波形过零特征,自适应调整短窗傅里叶变换的时域窗宽,解决了电网频率波动导致的相位累积效应对相位分析的影响,算法的幅值分析误差为10-3、相位分析误差小于1°;建立了复杂电能信号时频域数据表征模型和4类时频域全局化特征矩阵提取算法,解决了时频域特性表征与提取的问题;以典型非线性动态负荷中频炉为分析案例,分析给出了其4类时频域全局化特征,并建立了畸变波形动态电能测试信号特征模型,通过辅助实验验证了4个时频域全局化特征对电能表动态超差的影响,提出了对国际和国内标准修改的建议。