基于MCGS的S7-1200 PLC仿真实验系统设计

传统的PLC实验设备体积大、价格高、台套数受限，针对此问题，提出了基于MCGS组态软件的S7-1200 PLC仿真实验系统设计方案。在组态软件中创建虚拟的被控对象，以直观生动的组态画面显示控制过程，能够快速判断PLC控制程序是否正确。以液压滑台控制为例，阐述了PLC仿真实验系统的开发过程，实验结果表明，仿真实验系统能够形象直观地反映被控过程，能有效激发学生学习兴趣。     

基于组态设计方法的PLC实验仿真

通过对组态技术特点进行分析,将组态软件用于PLC的实验中,使PLC实验离开实物也能达到仿真效果。本文以3层电梯控制为例,给出了仿真程序流程图和仿真的界面图,并把传统实物实验与PLC仿真实验进行了对比。     

基于MCGS的三维动态仿真系统开发

为提高动态仿真系统的实时性和人机交互性,将PLC控制技术、三维建模技术与MCGS组态软件结合,提出了一种三维动态仿真系统的设计方法。以PLC作为控制器,MCGS组态软件作为动态仿真平台,分析仿真对象的运动状态并建立三维模型,通过组合位图和坐标变换的方法设计三维动态仿真画面,然后编写仿真程序来定义虚拟控制对象的仿真动作,并将MCGS组态软件和PLC控制器建立通信实现硬件在环HIL(Hardware-in-the-loop)仿真。结果表明所开发的动态仿真系统画面真实感强,实时交互性以及可靠性良好。     

基于PLC和组态软件的液压回路实时仿真系统设计

该文介绍了基于PLC和组态软件的液压回路实时仿真系统的实现方法,阐述了组态软件控制界面的实现方案,进行了PLC和组态软件的联机调试.实验证明,该系统具有稳定可靠、界面友好、操作方便等特点,实现液压系统在线仿真,可以实时监视液压系统的运行状态,为今后组建网络化的液压远程实时监控系统进行了初步的探索.     

iFix组态软件在虚拟控制对象中的应用

以五层电梯的虚拟对象运行为例,介绍了以PAC Systems RX3i系列PLC作为控制器和以iFix组态软件为基础的虚拟控制对象建立过程,以及建立虚拟控制对象的设计思路,指出了组态软件在对虚拟控制对象 建立中的应用及在应用中应注意的问题.     

基于PLC控制的生产线传输车仿真设计

从组态软件和PLC控制的特点出发,结合工控设备的实际需要开发基于PLC控制的生产线传输车,给出了PLC和组态开发的流程图。这种模式有利于组态软件、PLC的仿真测试。经过测试,系统运行良好。     

浅谈PLC课程教学直观化的实现方法

通过交通信号灯控制系统仿真设计,着重论述组态软件在可编程控制器（PLC）教学中的应用。通过组态软件对PLC控制系统进行仿真,实现课程教学的直观化,强化学生对被控对象工作现场实时状态的理解,提高学生的学习兴趣和现场调试工作能力。     

基于PLC和力控组态软件的搬运机械手模拟仿真系统设计

基于力控组态软件和PLC控制的搬运机械手监控系统设计,包括下位机PLC控制系统设计,用力控组态软件在上位计算机上组态监控界面,通过通讯接口在上位机模拟搬运机械手运行情况的全过程。解决了工业控制系统没有实际物理控制对象情况下,构建的形象直观反映机械手运行过程的仿真训练平台,提高了学生的工程应用能力,具有推广应用价值。     

基于PLC与力控组态软件的液化天然气工厂模拟仿真系统设计

该文以液化天然气工厂生产工艺系统为背景,设计了一套基于PLC与力控组态软件的液化天然气工厂模拟仿真平台。以级联式液化为例,构建力控图形界面,设置组态软件与PLC间的参数,编制级联式液化PLC程序并在虚拟平台下载调试运行。上位监控计算机在脱离实际物理控制对象的情况下,可通过PLC实物指示灯显示及力控仿真界面同时观察仿真结果。该系统可实现学员培训由现场的限时学习培训转变为实验室乃至互联网的随时随地学习培训,解决LNG生产储运相关行业实训手段不足的难题。     

PLC电气控制仿真教学系统的设计

在PLC实验教学中,要求学生对许多对象进行编程控制,为了能直观地看到实际控制效果,使用组态软件设计了控制对象的仿真软件,实现了控制对象实际运行情况的计算机仿真,极大节约了教学经费。     

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.     

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。     

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.     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

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.