PLC开发平台的研究及实现

针对目前PLC开发平台的缺陷和不足,基于面向对象的设计思想,开发了一套全新的PLC梯形图编辑软件.介绍软件的几大功能模块,详细论述梯形图文件的存盘和读取,梯形图语言向指令表的转化并最终生成目标代码的过程,以及模拟仿真的实现.软件采用巧妙的类管理机制和灵活的扫描算法,成功实现图形语言向文本语言的转化,由于指令语言比较接近机器语言,通过解释器对指令的解释生成控制系统所能识别的代码,可以实现程序在控制系统上的运行.本软件作为一个编写PLC程序的通用开发平台,功能强大、操作简单.     

嵌入式软PLC编译系统的设计

基于IEC61131．3标准,在嵌入式平台上设计并实现了软PLC梯形图编译系统。介绍了系统的结构设计,包括梯形图编辑器模块、语法检查模块、梯形图指令表转换模块以及指令表的生成过程,重点介绍了生成微处理器对应的目标代码的方法。用实例验证了开发系统的正确性,确保设计的梯形图程序能够正确的被转换和编译。     

PLC控制系统的计算机仿真研究

研制了一套基于LabVIEW的PLC控制系统计算机仿真平台软件。该软件是采用LabVIEW的图形化编程语言开发而成的。用户在该仿真平台上用梯形图形式的框图程序，就可以方便快捷地为PLC控制系统建立仿真模型，并可对系统进行调试。实验证明，该仿真平台可用于PLC控制系统的开发。     

基于MCGS聚丙烯装置催化剂搅拌器控制系统的设计与实现

针对特定小型搅拌设备采用DCS控制系统投资大、设备浪费严重,简单的PLC控制系统无法友好显示的缺点与不足问题,提出基于MCGS的搅拌设备计算机控制系统设计。其控制系统以PLC为核心,PC为上位机,PLC通过专用通信线和上位机通信。利用PLC实现对搅拌设备控制对象的自动控制,利用MCGS组态软件实现对整个系统运行的实时监控。结果表明:该控制系统运行稳定可靠,实现了设计所要求的控制目标与功能,满足聚丙烯催化剂搅拌设备的实际运行条件。     

可编程逻辑控制器编辑软件的研究及实现

针对目前可编辑软件的缺陷和不足,基于面向对象的设计思想,开发了一套全新的可编程逻辑控制器编辑软件在梯形图编辑完成后,可以将梯形图转换成指令程序,通过指令解释器对指令表的解释得出程序的逻辑,可以实现程序的模仿真.开发出来的编辑软件作为一个编写可编程逻辑控制器程序的通用开发平台,功能强大、操作简单,本文具体着重介绍了编辑软件系统总体结构和编译器的设计.     

基于开放式数控系统平台的软件PLC

设计了基于Linux数控系统的PLC程序执行机和PLC程序的描述模型，并设计了PLC程序的开放性通用可执行数据结构。开发了梯形图语言的图形化编程环境，实现了梯形图草图的绘制、修改和保存等编辑功能。在华中Linux数控系统平台上开发了PLC程序执行模块。通过在数控机床主轴控制中的应用实例，说明了图形化编程环境的使用方法和软件PLC执行机的原理。     

平衡轴加工机床的PLC控制

根据平衡轴加工机床的工艺特点，利用可编程控制器，设计了平衡轴加工的自动控制系统，给出了PLC控制梯形图，并编制了相应的控制程序。近两年的现场应用结果表明，PLC控制系统工作可靠、操作方便，提高了工效。     

基于MCGS的PLC温度监控系统设计

介绍了基于MCGS的PLC温度监控系统的组成、工作原理、PLC程序的设计与调试、MCGS组态及统调等内容.监控系统的设计改变了PLC控制系统无法直观地显示现场参数变化的缺点,操作人员可实时监控现场的参数,对工艺流程的参数进行设置,使操作、维护更加方便.     

数控系统中梯形图编辑软件研究及实现

针对目前PLC梯形图编辑软件的缺陷和不足,选用Borland C Builder作为开发语言,采用面向对象的设计方法,开发一种基于Windows 2000面向数控PLC的使用梯形图语言编写PLC程序的通用开发平台。该系统实现了对多种PLC的图形编辑和仿真,使用方便,提高了工作效率。     

基于IEC61131—3标准的梯形图组态仿真软件的研究

梯形图因其直观、易于掌握等优点用的较为普遍。考虑到仿真支撑平台STAR-90无法实现梯形图的组态,通过研究梯形图执行顺序理论,提出一种新的执行顺序理论,并且用C＋＋Builder6．0作为系统开发平台,设计和开发了基于IEC61131—3标准的梯形图组态仿真软件,使得这个组态仿真软件开发设计的DCS仿真机的仿真性更好,逼真度更高。     

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...     

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。     

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...     

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。     

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。     

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.     

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.     

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.     

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.