烘烤控制系统的UML建模与实现

钢包烘烤控制系统多采用可编程逻辑控制器做控制系统.针对钢包烘烤控制系统,以面向对象方法进行分析和建模,以统一建模语言为工具,进行系统功能分析、对象行为分析并建立系统时序图,从而为烘烤控制系统建立模型.经程序验证,在烘烤控制系统中引入面向对象思想,不仅简化了控制系统程序,并且提高了系统的可维护性.     

基于状态机的巡线机器人控制系统设计

通过对巡线机器人运动控制系统的分析,提出采用有限状态机实现运动控制系统中的运动保护及机构定位系统的方法.结合巡线机器人运动控制的特殊需求,通过对运动控制系统的时序分析,设计了运动保护及定位系统的状态机.并在可编程器件上实现了巡线机器人运动控制器,从而给出了基于可编程器件设计控制系统的一种方法.     

可编程序控制器在储能焊机上的应用

提出采用可编程控制器控制储能焊机,可以解决在传统工艺下进行焊接生产所存在的问题。较详细地介绍了焊机的程序框图、时序控制波形图及梯形程序图和安装控制系统的若干要领。文未还介绍了应用效果。     

基于组态技术的机械手控制

可编程控制器能时工业现场的机械手进行有效而灵活的控制.而在对可编程控制器和现场设备运行情况的监测管理上传统实现模式存在着很多不足.本文阐述了基于组态技术的分布式控制系统的结构组成和设计要点.实践证明:机械手控制系统充分体现了上位机的图形、控制和数据管理能力,充分体现了可编程控制器的工业现场适应性和控制驱动能力.     

可编程控制器在电厂输煤控制系统中的应用

介绍了可编程控制器在电厂输煤控制系统中的应用 ,详细阐述了输煤系统中采样装置的可编程控制系统的设计过程 ,并展望可编程控制器的应用前景。     

六路时序可编程控制器的应用

笔者曾在本刊2000年第10期发表了“三种应用广泛的低价位时序可编程控制器”一文,简要介绍了六路时序可编程控制器。收到很多读者来信,咨询六时序可编程控制器的详细资料,为满足读者的需要,现特撰稿介绍其具体应用资料。该控制器是采用美国Mi-crochip公司PIC16C57单片机编程设计而成,能广泛应用于工业、农业的时序自动控制领域中。可控制电机分别按顺转、停、反转、停,循环工作,且循环周期可定,还可对电磁阀群、喷灌、加温火力调节等控制。     

基于Avalon总线的多通道PWM控制器的实现

设计了一种可应用于片上可编程系统的多通道数字PWM控制器.该控制器基于Avalon片内总线技术,符合该总线的读写传输时序,具有完备的PWM输出能力.控制器用原理图输入与Verilog HDL语言混合设计的方法在Cyclone II系列的EP2C5F256C6现场可编程控制器上实现.实验表明,这种PWM控制器具有很高的可重用性,更易于调试和实现多通道控制,并可应用于任何支持Avalon片内总线的片上可编程系统上.     

可编程控制器的发展及在DCS中的应用

本文简要介绍了可编程控制器的国内现状、国外可编程控制器的技术发展动向及可编程控制器在分散控制系统中的应用。     

可编程控制器在全自动管冰机控制系统中的应用

以ＦＸ２系列可编程控制器在管冰机控制系统中应用为例,介绍了可编程控制器在管冰机控制系统中的编程设计思想和实际应用。     

可编程控制器在核聚变装置中的应用

介绍世界第三大超导核聚变装置电源控制系统可编程控制器的应用设计.介绍西门子S5—135U系列可编程控制器(PLC)的软件编程及外围硬件电路设计.     

A simplified visual inspection system using a personal computer

For a practical visual inspection system, data processing in real time, flexibility for variety of products, and cost performance have been required. This article describes a simplified visual inspection system that has well-balanced performance that meets these requirements. Inspection data processing by software makes the inspection system flexible. Development of a simplified pattern matching method based on limiting the inspection within the area pointed by an user and direct memory access of binary image data performs a high speed inspection function. By using a personal computer as a processor of this system, a cost effective inspection system is realized.     

An optimal production lot-sizing problem for an imperfect process with imperfect maintenance and inspection time length

This article develops an integrated model in considering the situations of an imperfect process with imperfect maintenance and inspection time for the joint determination of both economic production quantity (EPQ) and preventive maintenance (PM). This imperfect process has a general deterioration distribution with increasing hazard rate. Even with periodic PM, such a production system cannot be recovered as good as new. This means that the system condition depends on how long it runs. Also, the PM level can be distinct due to the maintenance cost. For convenience, it is assumed the age of system is reduced in proportional to the PM level. Further, during a production cycle, we need an inspection to see if the process is in control. This inspection might demand a considerable amount of time. In this article, we take PM level and inspection time into consideration to optimise EPQ with two types of out-of-control states. To see how the method works, we use a Weibull shock model to show the optimal solutions for the least costs.     

Evaluation of a job‐aiding tool in inspection systems

Visual inspection plays a very important role in ensuring quality in the manufacturing and service industries. Two determinants of inspection performance are visual search and decision‐making. Improvement in any one of the components will have an impact on system performance. Job‐aids, accompanied by training, have proven to be effective in enhancing accuracy and reducing search time in visual inspection systems. This article aims to investigate the effects of search strategy along with task complexity and pacing on inspection performance using a job‐aiding tool. To facilitate the experiments, an enhanced job‐aiding tool in a simulated visual inspection environment was developed. This tool enables an inspector to track his or her search path in visual inspection systems. A pilot study and two experiments were conducted using this tool. The pilot study examined the effectiveness of the job‐aiding tool. The first experiment studied the effect of search strategy and task complexity on inspection system performance and the second experiment studied the impact of search strategy, task complexity, and pacing on system performance. Results from this research can be used to better design an inspection system. © 2007 Wiley Periodicals, Inc.     

机器视觉在印刷缺陷在线检测中的应用与研究

为了提高印刷缺陷检测准确性与效率,满足缺陷检测的实时性,提出了机器视觉技术应用于印刷缺陷在线检测并研究检测过程中的相关问题.设计印刷缺陷在线检测的方案及以数字信号处理器DSP为核心的视觉在线检测系统的硬件结构组成.研究图像预处理、图像匹配与缺陷检测的算法并加以改进使其满足缺陷检测的实时性.开发印刷品缺陷视觉检测软件,对缺陷检测流程进行仿真,验证检测方案与图像处理算法的可行性.     

GPS远程传输巡检系统在油田生产中的应用

本文主要介绍了GPS巡检系统的研究和应用,以及系统的组成及效果分析。阐述了在油田生产过程中,通过运用该技术实现了对日常生产巡检工作的落实和监督,调高了生产管理水平,确保油田的安全生产,实现巡检工作的信息化管理,为油田的数字化建设奠定了基础。     

Integrated vendor--buyer inventory system with sublot sampling inspection policy and controllable lead time

This article investigates the impact of inspection policy and lead time reduction on an integrated vendor--buyer inventory system. We assume that an arriving order contains some defective items. The buyer adopts a sublot sampled inspection policy to inspect selected items. The number of defective items in the sublot sampling is a random variable. The buyer's lead time is assumed reducible by adding crash cost. Two integrated inventory models with backorders and lost sales are derived. We first assume that the lead time demand follows a normal distribution, and then relax the assumption about the lead time demand distribution function and apply the minimax distribution-free procedure to solve the problem. Consequently, the order quantity, reorder point, lead time and the number of shipments per lot from the vendor to the buyer are decision variables. Iterative procedures are developed to obtain the optimal strategy.     

督查网络管理系统中系统互联的实践

介绍了上海市行政督查网络管理系统，它是一个覆盖全上海区县、委办局督查网络的政务信息化系统，在该系统的建设过程中对相对独立的业务系统互联进行了一定实践。从具体业务应用需求出发，结合相关技术的应用，对建设过程中所遇到问题的解决方案进行了一次总结。     

Automated visual inspection: A tutorial

This article introduces the topic of automated visual inspection (AVI) as a subset of machine vision. The components of a generic AVI system will be presented and current applications of AVI systems will be discussed. Specifically, the applications of automated dimension verification, bare printed circuit board inspection, stuffed printed circuit board inspection and component identification using color technology will be covered in some detail.     

Optimal non-periodic inspection scheme for a multi-component repairable system using A search algorithm

This paper proposes an approach for finding an optimal non-periodic inspection scheme on a finite time horizon for a multi-component repairable system. The system consists of several components, each of which is subjected to soft failure. Soft failures of each component do not cause the system to stop functioning, but increase the system operating costs and are detected only if inspection is performed. Thus, the system is inspected at the scheduled inspection instances and if any of its components is found to have failed, the failed component is minimally repaired. The system’s expected total cost associated with a given inspection scheme includes inspection costs, repair costs, and the penalty costs that are incurred due to the time delay between the actual occurrence of a soft failure of the components and its detection at an inspection. The objective is to determine the optimal inspection scheme which minimizes system’s expected total cost.     

Optimal non-periodic inspection scheme for a multi-component repairable system using A1 search algorithm

This paper proposes an approach for finding an optimal non-periodic inspection scheme on a finite time horizon for a multi-component repairable system. The system consists of several components, each of which is subjected to soft failure. Soft failures of each component do not cause the system to stop functioning, but increase the system operating costs and are detected only if inspection is performed. Thus, the system is inspected at the scheduled inspection instances and if any of its components is found to have failed, the failed component is minimally repaired. The system’s expected total cost associated with a given inspection scheme includes inspection costs, repair costs, and the penalty costs that are incurred due to the time delay between the actual occurrence of a soft failure of the components and its detection at an inspection. The objective is to determine the optimal inspection scheme which minimizes system’s expected total cost.In the proposed approach, the system’s expected total cost is first formulated in terms of inspection scheme. Then, A¹ search algorithm, with a proposed heuristic cost function for calculating lower bounds, is employed to search through alternative inspection schemes to determine the optimal one. The proposed approach is illustrated through a numerical example.