智能算法PLC与DCS通讯实现

本文RS-485总线连接通过MODBUS RTU协议转换,实现罗克韦尔PLC与上海新华DCS通讯,并通过虚拟DPU建立数据交互和组态应用关系,从而达到智能控制算法作用到DCS控制系统自动优化的目的。     

玻璃熔窑温度智能控制系统

本文针对玻璃熔窑这种复杂的工业对象提出一种智能温度控制系统.控制采用多层结构,第一层为监督结构,利用影响性能指标的玻璃液温度作为控制量;第二层为澄清部温度控制,控制策略为自校正模糊控制算法;最底层为PID控制.利用DCS实现整体温度控制.通过实际运行证明了控制方法的有效性.     

氨合成塔温度分级递阶智能控制

本文详细分析了氨合成塔的控制难点,提出了分级递阶的智能控制方案.其中,监控级实现了系统在不同负荷下的调节参数切换,并利用神经网络模型对氨产率进行预测来指导生产操作.该方案以DCS为依托,建立上层监控管理局域网,实现了对氨生产过程的智能监控与管理.     

智能控制方法的选择及其应用

随着智能控制设计形式和设计方法的日益丰富以及智能控制应用的日益普及,智能控制的相关技术及其控制策略的选择变得日益重要。本文提出了设计智能控制系统时选择何种控制方式、采用何种技术及其相应控制策略所应考虑的一般方法,并结合实例,从方法上给出了各种智能控制技术及控制策略的选择方法和简单评价。     

基于OPC的温室智能控制系统接口设计与应用

该课题来源于国家科技支撑计划项目。通过OPC接口的设计,将多因子协调控制算法嵌入到DCS软件中,以实现对温室系统基于智能控制算法和DCS架构的分布式控制。文中介绍了OPC标准的技术规范,分析了自动化接口的对象模型,根据温室智能控制系统的需求对基于OPC接口的客户端软件的功能模块和通信流程进行了设计。系统的运行测试表明,开发的客户端程序运行可靠,数据读取实时性强。     

煤矿工作面需风量预测及通风机智能控制

为达到对通风机风速控制的准确性和解决传统风速控制方式的问题，在对通风机简单概述的基础上，对工作面需风量的预测展开研究，确定需风量预测的模型；对比了传统PID控制策略、模糊算法控制策略以及T-S模糊神经控制策略的响应特性和超调量，确定采用T-S模糊神经控制策略实现通风机的智能控制，并完成了相关硬件的选型。     

浅析热电厂锅炉控制中的智能化控制技术的应用

随着科学技术的不断发展,各行各业都将自动化技术、智能技术纳入发展规划并进行现场应用,提高生产效率。我国热电技术发展较快,部分企业虽然采用DCS系统,但还存在着智能化控制水平低、当热用户负荷波动大造成的锅炉控制系统运行效率不高、热电系统运行稳定性低等问题。电厂在DCS上实现智能控制不失为一种好的方法。笔者对相关智能控制技术进行了分析与探讨,给出了相关改进方案,通过在热电厂锅炉控制中引入智能控制系统,进而实现了热电厂锅炉工作过程的精准控制,效果良好,具有较好的推广价值。     

智能控制在烟厂烟丝烘干控制系统中的应用

本文给出了烟丝烘干系统的控制策略,利用仿人智能控制实现了烟丝烘干系统的控制,给出了该控制器的详细设计。     

CS3000DCS控制系统在PTA装置的应用

随着计算机技术的不断发展，DCS控制技术得到了飞速的发展和完善。其控制策略涵盖了传统PID控制、逻辑控制、顺序控制等各种控制策略；同时使用PC机为基础的人机接口，使DCS的工程组态得到了简化，提高了工程组态效率。在辽化80万tPrA改扩建项目中采用横河公司的CENTUMCS3030系列DCS系统，完成对装置生产过程的控制，为装置的平稳运行奠定了基础。     

集散控制系统的最新技术特点与展望

集散控制系统(DCS)因其具有控制和危险分散、管理和显示集中的显著特点仍被作为当今工业过程控制领域的主要控制系统之一.该文在对DCS的基本体系结构和技术特点进行必要阐述的基础上,描述了DCS的发展现状,介绍了最新DCS的技术特点,列举了和FCS比较DCS存在的问题,最后对DCS的发展作出了包括和FCS结合,打造更加完善的综合系统;出现更多满足中小用户需求的中小型DCS;具有无线通信功能;智能控制、智能诊断等四方面的展望.     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

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。     

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.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

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。     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...