基于PROFIBUS现场总线的水处理厂自控系统及其应用

针对水处理厂的工艺特点，分析了水处理过程控制的基本要求，在对现场总线技术分析研究的基础上，着重介绍了PROFIBUS现场总线的结构、协议等技术特点，并与工业以太网技术相结合，提出了基于PROFIBUS现场总线的自控系统，应用在某污水处理厂，结果表明该控制系统能够满足水处理工艺的实际要求，具有一定的工程示范作用。     

基于PROFIBUS现场总线的水处理厂白控系统及其应用

针对水处理厂的工艺特点，分析了水处理过程控制的基本要求，在对现场总线技术分析研究的基础上，着重介绍了PROFIBUS现场总线的结构、协议等技术特点，并与工业以太网技术相结合，提出了基于PROFIBUS现场总线的自控系统，应用在某污水处理厂，结果表明该控制系统能够满足水处理工艺的实际要求，具有一定的工程示范作用。     

基于工业以太网EtherCAT的DCS控制系统设计

EtherCAT是一种新型的工业以太网现场总线技术,在工厂自动化和流程自动化领域得到了广泛应用.文章介绍EtherCAT现场总线的技术特点,设计了一套基于EtherCAT的DCS实例系统.该系统中主控制器单元和现场输入输出设备之间使用EtherCAT实现高速、大容量的数据通信,并使用标准以太网与中央控制器进行数据交换.     

先进的PROFINET总线标准是自动化系统应用的捷径

PROFINET由PROFIBUS国际组织（PROFIBUS International-PI）推出，是新一代基于工业以太网技术的自动化总线标准，PROFfNET为自动化通信领域提供了一个完整的解决方案，包括了诸如：实时以太网、运动控制、分布式自动化、故障安全以及网络安全等当前自动化领域的热点。作为跨供应商的技术，可以完全兼容工业以太网和现有的现场总线（如：PROFIBUS）技术，保护用户现有投资。它基于工业以太网标准，使用TCP／IP协议和IT标准，实现自动化技术与实时以太网技术的统一，     

精密箱体柔性制造系统网络通信的实现

基于昆机FMS1600精密箱体类柔性制造系统的系统集成控制解决方案,介绍了FMS系统网络通信结构、设备组态及通信方式,解决了PROFIBUS现场总线与企业生产计划管理层集成不足的问题.采用PROFIBUS -DP现场总线和工业以太网双层网络结构,组成通信与控制紧密结合、控制与管理一体化的FMS控制系统,该系统经实际应用,实现了FMS全自动集成控制功能,取得了良好的经济效益.     

WAGO—I／O-SYSTEM助力实现透明工厂

PROFINET吸纳了工业以太网的技术诀窍,采用开放的IT标准,与以太网的TCP／IP标准兼容,并提供实时功能。它能与现有的现场总线系统（如PROFIBUS）有机集成,无需改动现有设备的组态和编程。通过工业以太网,连接从现场层到管理层的设备,可以实现从公司管理层到现场层的直接、透明的访问。     

基于OPC的子午线轮胎生产过程监控系统

针对全钢子午线轮胎生产过程的信息化程度不高和监控实时性问题,对全钢子午线轮胎生产工艺特点、系统控制需求、PLC控制技术、OPC技术等方面进行了深入研究,通过运用现场总线、工业以太网、数据库、计算机通信、互联网等技术,设计了一种基于OPC技术的全钢子午线轮胎生产过程实时监控系统,实现了数据采集、数据处理、用户界面显示、历史数据查询、信息报警、生产监控等功能.以全钢子午线轮胎三复合胎面挤出生产线为例,详细介绍了实时监控系统的设计与具体实现,并搭建实验平台对监控系统的OPC技术以太网通信、数据传输的实时性和可靠性等方面进行了测试.实验结果表明,该系统可有效地实现对轮胎生产现场的实时监控,为企业决策层提供可靠的现场过程数据.     

基于无线以太网的多线程数据采集系统设计

针对工业控制中现场总线存在电磁干扰大和串口数据传输不稳定、工程布线繁琐等问题,设计了一种以无线以太网为通讯方式的数据采集处理系统,介绍了数据采集系统的关键技术以及通讯软件的实现。实验证明该方案有效地解决了现场总线干扰问题,数据传输可靠性高,实时性好。     

基于Profibus-DP的钢丝主缆内部状态测控系统

由于钢丝主缆内部状态测控具有位置分散性与参数多样性的特点,将现场总线与工业以太网技术引入测控系统,设计了基于现场总线与工业以太网的测控系统,主要实现对主缆内部温度、相对湿度、压力等参数的实时采集存储、监测报警,以及对除湿机、变频风机等设备的连锁、极值和均值控制等。上位机使用组态进行操作,可实现远程监控,实时显示信息,为主缆干燥方法提供了可靠的测控系统保障。     

一种基于工业以太网的控制系统的设计与实现

随着以太网技术的迅猛发展,工业以太网在工业控制系统中扮演着越来越重要的角色.结合嵌入式网络技术,区别于现有的各种基于现场总线的控制系统,本文给出了将以太网直接应用于工业现场设备监控的系统设计方案,且进行了实验测试.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.     

OPTIMIZATION METHOD ON IMPELLER MERIDIONAL CONTOUR AND 3D BLADE

An optimization method for 3D blade and meridional contour of centrifugal or mixed-flow impeller based on the 3D viscous computational fluid dynamics (CFD) analysis is proposed. The blade is indirectly parameterized using the angular momentum and calculated by inverse design method. The design variables are separated into two categories: the meridional contour design variables and the blade design variables. Firstly, only the blade is optimized using genetic algorithm with the meridional contour remained constant. The artificial neural network (ANN) techniques with the training sample data schemed according to design of experiment theory are adopted to construct the response relation between the blade design variables and the impeller performance. Then, based on the ANN approximated relation between the meridional contour design variables and impeller performance, the meridional contour is optimized. Fewer design variables and less calculation effort is required in this method that may be widely used in the optimization of three-dimension impellers. An optimized impeller in a mixed-flow pump, where the head and the efficiency are enhanced by 12.9% and 4.5% respectively, confirms the validity of this newly proposed method.     

5083H111轧制铝合金的低周疲劳行为

在室温下对5083H111轧制铝合金板三个典型方向——轧制方向(RD方向)、与轧制方向成45°角方向(MD方向)、垂直于轧制方向(TD方向)的试样进行了单轴对称应变控制的低调疲劳试验,研究了不同方向试样的循环变形行为和疲劳寿命差异。结果表明:铝合金板在三个方向上都表现出了明显的循环硬化特性,即在恒定的应变幅下,三个方向的响应应力幅均随着循环次数的增加而增大,并且外加应变幅越大,响应应力幅也越大;三个方向的低周疲劳ε-Nf曲线差别不明显;三参数幂函数寿命模型可以很好地预测5083H111铝合金的低周疲劳寿命。