Safer Design and Less Cost Operation for Low-Traffic Long-Road Illumination Using Control System Based on Pattern Recognition Technique

The paper covers analysis and investigation of lighting automation system in low-traffic long-roads. The main objective is to provide optimal solution between expensive safe design that utilizes continuous street lighting system at night for the entire road, or inexpensive design that sacrifices the safety, relying on using vehicles lighting, to eliminate the problem of high cost energy consumption during the night operation of the road. By taking into account both of these factors, smart lighting automation system is proposed using Pattern Recognition Technique applied on vehicle number-plates. In this proposal, the road is sectionalized into zones, and based on smart Pattern Recognition Technique, the control system of the road lighting illuminates only the zone that the vehicles pass through. Economic analysis is provided in this paper to support the value of using this design of lighting control system.

Frame Design and Reality of On-line Quality Control System for CNC Machining Center Based on Microcomputer

After giving a short review of the methods used for detecting and monitoring in general systems, this paper describes the way of communication between computer and Computer Numerical Control (CNC) Machining Center (MC). Based on these, the paper addresses the means of performing in cycle measurement for manufacturing quality, provides an approach of improving the state of manufacturing process by achieving the real time change of control parameters according to the level of manufacturing process, and discusses the technique of implementing in process dimensional errors compensation corresponding to the in cycle measurement. The results of the experiments show that the frame design is successful and the operation is reliable. The system is taking shape nowadays.

Vision Navigation Based PID Control for Line Tracking Robot

In a controlled indoor environment,line tracking has become the most practical and reliable navigation strategy for autonomous mobile robots.A line tracking robot is a self-mobile machine that can recognize and track a painted line on thefloor.In general,the path is set and can be visible,such as a black line on a white surface with high contrasting colors.The robot’s path is marked by a distinct line or track,which the robot follows to move.Several scientific contributions from the disciplines of vision and control have been made to mobile robot vision-based navigation.Localization,automated map generation,autonomous navigation and path tracking is all becoming more frequent in vision applications.A visual navigation line tracking robot should detect the line with a camera using an image processing technique.The paper focuses on combining computer vision techniques with a proportional-integral-derivative(PID)control-ler for automatic steering and speed control.A prototype line tracking robot is used to evaluate the proposed control strategy.

An on-line data acquisition system of oscilloscope-embedded input/output controller for cavity BPM measurement

Cavity beam position monitor(BPM) is widely used in a precise electron beam position measurement. Based on high performance oscilloscope-embedded EPICS input/output controller,we developed an on-line cavity BPM signal processing system for fast data acquisition solution when designing a cavity BPM.Also,methods for extracting the position information from cavity pickup signals and calibration algorithm are included in this solution.

Modeling of Microstructure Evolution and Mechanical Properties of Steel Plates Produced by Thermo-Mechanical Control Process and Its On-line Application

An integrated metallurgical model was developed to predict microstructure evolution and mechanical properties of low-carbon steel plates produced by TMCP. The metallurgical phenomena occurring during TMCP and mechanical properties were predicted for different process parameters. In the later passes full recrystallization becomes difficult to occur and higher residual strain remains in austenite after rolling. For the reasonable temperature and cooling schedule, yield strength of 30 mm plain carbon steel plate can reach 310 MPa. The first on-line application of prediction and control of microstructure and properties (PCMP) in the medium plate production was achieved. The predictions of the system are in good agreement with measurements.

Numerical Controlled Rolling Process of Thick Metal Plate

Thick metal plate rolling process has become more and more important in building a flat roof of drilling on the bottom at sea. This is because not only the product quality requirement higher and higher but also the marketing competition. To improve the process of thick metal plate rolling and to increase productivity a numerical controlled rolling process is developed, which include the process planning, the mathematical model establishment and the numerical control system development. The process is for the 17 000 kN×3 000 mm movable up roller bending machine. According to the machine configuration non-symmetry rolling process is planed. This makes it possible to integrate all the steps of plate shaping up such as end side bending, several times of semi-shape bending and the last shape finishing. Since the process will perform under the numerical controlled condition whole steps of the process are considered can be worked in the automatic cycle. The mathematic model consists of two sections, the theory model and the experience parameters model. Which takes the original plate parameters such as geometry and mechanics, characters of the machine such as the movement limits, tonnage and so on as input and calculates all the parameters needed in process performing. Meanwhile, the mathematic Model is totally adapted to the control system. The numerical control system development scheme is based on all the works above. Here, a system plan is provided. The functional modules and hardware selection, in detail, are introduced. The system software on top level and the controlling software for controller are developed. And some unit techniques in the system such as timer setting, communication between system and controller, video integration, and the ability of resisting impact force are introduced. The process has been used successfully in production for more than two years. Practice approves that the process is robust.

Study on the automatic process of line heating for pillow shape plate

This paper focuses on the process for pillow shape plate by line heating technique, which is widely applied in the production of ship hull. Based on the analysis of primary parameters and experimental data in line heating process, the amount of local contraction generated by line heating has been illustrated. Then, combining with the computational result of local deformation determined by shell plate development, an optimization method for line heating parameters has been studied. This prediction system may provide rational arrangements of heating lines and technical parameters of process. By integrating the prediction system into the line heating robot for pillow shape plate, the automatic process of line heating for pillow shape plate can be achieved.

Developing of robot flexible processing system for shipbuilding profile steel

A robot flexible processing system of shipbuilding profile steel was developed. The system consists of computer integrated control and robot. An off line programming robot was used for marking and cutting of shipbuilding profile steel. In the system the deformation and position error of profile steel can be detected by precise sensors, and figure position coordinate error resulted from profile steel deformation can be compensated by modifying traveling track of robotic arm online. The practical operation results show that the system performance can meet the needs of profile steel processing.

大型连续绿茶精制加工生产线研发

茶叶加工技术与装备是茶叶产业发展的基础,对行业发展起着举足轻重的作用。为实现绿茶加工机械自动化生产,设计了大型连续绿茶精制加工生产线,阐述了该生产线系统结构、主要生产环节及安装调试应用。基于PLC控制的大型连续绿茶精制加工生产线,主要由鲜叶上料输送机、大型滚筒杀青机、冷却回潮机、四机协同联动式揉捻机组、并列连续预烘干机组、储料仓、计量分料装置、茶叶炒干与抛光机组、筛分装置、风选装置及配套的测控系统等组成。针对绿茶加工工艺的各个环节,采用模块化设计,根据茶叶加工企业的厂房实际情况,灵活安装组线,满足企业个性化需求。基于模糊PID温度控制的大型滚筒杀青机双模糊控制技术,解决了传统杀青温度与时间无法实现精确控制的难点问题。采用链式刮板输送智能加料装置与多机联动协同连续揉捻控制技术,实现多机协同联动式自动加料连续揉捻,边进料边揉捻,揉捻均匀度高。生产线上杀青机、理条机和烘干机各环节温度采用模糊PID控制,解决了茶叶加工温度、投叶量与杀青、理条、烘干时间实时配合的问题,输入不同等级、不同重量的鲜叶可输出相适应的杀青温度和时间,实现对茶叶生产过程的精确控制,减少人为因素的干扰,实现绿茶的智能化生产。近年来,生产线用户遍布皖、苏、浙、云、贵、川、豫、湘、鄂和陕等10多个省份200余家茶叶生产企业。该生产线的推广应用,实现了茶叶规模化生产,保证了茶叶品质,对茶产业发展具有重要意义。

茶叶智能化拼配匀堆除杂生产线控制系统设计

为提高红茶生产工艺水平和产能,通过变频器、PLC、触摸屏及IPC的电气集成,搭建了一套茶叶生产线分布式控制系统,完成了PLC控制程序、现场控制级触摸屏HMI和IPC监控软件的设计,实现了红茶生产线的全过程自动控制、实时数据采集、生产工艺参数设置、历史数据查询及故障自动报警等功能。该系统具有红茶生产线设备的管控一体化功能,满足了现场生产信息可视化监控的要求,智能化程度高,整体技术水平先进。

中深层煤炭地下气化的气化腔安全宽度计算方法

煤炭地下气化是目前温度最高(超过1200℃)的化石能源非常规开发方式,中深层(本文指埋深800~1500 m)煤炭地下气化在提高气化压力、降低地质安全风险方面优势明显,科学预测气化腔安全宽度对保障气化稳定运行十分重要,由于目前基于可控注入点后退(CRIP)工艺的气化腔安全宽度计算方法尚未建立,为保证现场试验顺利实施,需要开展针对性研究。气化腔顶板“裸露”在气化腔后会受到高温影响,通过数值模拟方法研究了压应力约束条件下岩石内部热应力产生位置以及颗粒、基质热膨胀系数差异对热应力大小的影响规律,结合高温处理后的岩石电镜扫描结果,查明了高温下岩石热损伤机理。根据CRIP气化工艺造腔特点,建立了考虑高温影响的气化腔顶板薄板模型,结合“关键层”理论提出了气化腔安全宽度计算方法。研究表明:岩石热损伤是岩石物理化学反应与热应力互相促进、共同作用的结果,高温下岩石发生不规则变形,岩石热损伤引起的微观结构变化是导致岩石力学性质、物理性质变化的根本原因。岩石的最大拉张热应力出现在颗粒界面或热膨胀系数较小的颗粒中,颗粒与基质热膨胀系数比值在[0.01~1)时,最大拉张热应力随颗粒热膨胀系数减小而快速增加。泥岩加热到200℃时开始出现微裂隙;加热到400℃时裂隙发育更加明显,主要是沿颗粒边缘破裂;加热到600~800℃时,裂隙数量增多、尺寸变大;加热到1000℃时,除出现较大裂隙外,还产生了大量孔隙;1200℃时裂隙连通性明显增加,气孔发育较大。由于高温的影响,薄板模型的步距准数不再是定值,需要根据气化腔顶板热破坏范围与顶板硬岩层的空间位置关系确定具体数值。气化腔安全宽度受温度影响,在研究算例中,砂岩顶板在35、1000℃时安全宽度计算结果分别为34.3 m和14.1 m,相差达58.9%,泥岩顶板在35、1000℃时安全宽度计算结果分别为16.7 m和15.9 m,相差4.8%。最后从降低顶板垮落风险、有利于气化控制角度,提出了煤层纵向靶区位置的确定方法,当煤层厚度超过气化腔安全宽度一半时,建议将水平井纵向靶区设计在距离煤顶不超过气化腔安全宽度一半的位置。

智能制造背景下的高职PLC 教学改革探究

智能制造时代对高职教育中的可编程控制器课程提出新要求,高职院校要积极进行改革创新,以适应产业变革和人才培养的新需求。智能制造背景下,可编程控制器与数据处理、机器人控制、智能化产线、互联网等领域密切相关,但高职可编程控制器课程存在理论与实践脱节、实验设备过时、师资不足、缺乏学科融合、不注重培养学生核心能力等问题。在具体实践中,要增加典型项目案例、构建虚拟实验平台、强化师资培训、整合跨学科课程、优化培养模式,进一步提高课程教学效果。

热轧极致能效解决方案

钢铁行业CO_(2)减排已成为热点问题,各钢铁企业探索在保证产量、产品质量的前提下降低产品能耗。基于热轧机理模型,以预测控制、工艺参数优化为主要技术路径,提出了热轧工序节能的系统解决方案,从基础设施、机组预测、产线优化、基地平衡等4个维度进行阐述,并通过工程实践验证。该方案具有普适性,可推广到其他间歇式生产工序。

基于刀具轨迹规划的曲面零件仿真加工研究

数控加工中,刀具轨迹规划直接影响加工效率和质量。为了提高曲面零件在数控加工过程中的表面质量,分析典型刀具轨迹规划方法的优缺点,并以曲面模型为例,合理安排加工工艺、选择数控加工策略,进行仿真加工。粗加工阶段,以加工效率为目标设定工艺参数;半精加工阶段,对比平行精加工和流线精加工效果;精加工阶段,结合最佳切削行距和残留高度计算对仿真进行实验分析,通过程序行数、进给长短、切削时间进行数据分析,结合实际操作技巧对仿真结果进行输出,为曲面类零件数控加工提供参考。

基于混线工艺的装配线虚拟建模技术研究

目前,RV减速器装配线因固化的装配工艺导致更换产品型号需要整线停产更换,这严重降低了RV减速器等同类型产品的制造效率和企业的市场竞争力。因此,提出了面向混线工艺的RV减速器虚拟装配线,基于数字孪生建模技术,建立多维属性一致、映射全面、物理信息融合的虚拟装配线,并基于生产资源与装配工艺模型的拆解,将生产资源与工艺动作关联映射,实现实时快速工艺调控,达到混线生产的效果。以企业的RV减速器装配线为例,建立了混线工艺驱动的虚拟装配线,能够实现装配过程虚拟仿真、在线工艺调控等功能,有效地减少了制造成本,大幅提升了该装配线的生产效率。

Mathematical Model of Dynamic Operation and Optimum Control of Billet Reheating Furnace

This paper provides a mathematical model for the billet reheating process in furnace.A new optimum method is brought up that the objective function is the integral value of enthalpy increasing process of a billet.Different delays are simulated and calculated,some proper delay strategies are ob- tained.The on-line computer control model is de- veloped.The real production conditions simulated, the temperature deviation of drop out billet from the target temperature is kept within±15℃.

二段炉内衬更换施工控制要点简述

从二段炉内衬更换施工作业准备、作业程序、作业方法、作业内容、作业技术要点、质量控制要点等方面,论述了内衬更换施工过程及重点部位的控制要点。

基于锁避免的事务内阻塞分析与调度策略

在现代教育环境中,高效且可靠的数据管理系统对于在线教育平台和学生信息管理系统的运行至关重要.随着教育数据量的持续增长和多用户访问频率的提高,数据库系统面临并发冲突操作带来的高吞吐要求的挑战.在众多并发控制策略中,基于锁的控制策略是数据库系统中常用的策略之一,然而,由于锁造成的阻塞会影响数据库中事务并发执行的性能.现有的工作主要通过调度事务间执行顺序或优化存储过程等方法减少锁竞争.为了进一步提升事务吞吐,本文基于锁避免进行事务内的阻塞分析和代价建模,并提出事务内调度策略,通过对工作负载的阻塞分析预估调度代价,然后根据一定规则在事务内部有限程度地交换操作顺序,减少锁阻塞造成的延迟,从而提高性能.最后,通过对比传统的调度策略,验证了提出的调度策略对吞吐的提升及对事务平均延迟的降低的效果.

TMCP态桥梁钢与316L不锈钢制备的爆炸复合板热处理工艺研究

介绍了研究控轧控冷(TMCP)生产的Q370qD桥梁钢和316L不锈钢制备的爆炸复合板热处理性能与组织演变过程。结果表明:316L/Q370qD(TMCP)爆炸焊接复合板低温退火后强度偏高延伸率较低,900℃高温退火后强度不合格、冲击值离散性大;优化热处理方案进行630~710℃退火,最终确认适宜的热处理温度区间为650~680℃、时间为1.5~2 h,大规格复合板退火(680℃/1.5 h退火后空冷)验证测试性能合格,后续生产处理效果良好,表明TMCP状态的Q370qD桥梁钢与316L不锈钢制备爆炸复合板具有可行性。