唐钢大型烧结机控制系统

介绍了唐钢炼铁厂三烧车问实现烧结过程智能控制管理系统的组成及混合料量控制、混合料水分控制、烧结机布料控制、烧透点位置控制和烧透偏差控制等控制管理模型，实践证明，控制管理系统性能稳定，取得了良好的控制效果。     

工程项目投资的全过程控制

简述了工程项目投资全过程控制的原理,以及各阶段对工程项目投资控制所起的作用和控制的方法。在工程建设中投资控制应注意抓住投资决策控制和设计控制,它们是工程项目投资的全过程控制的关键性环节。     

穿孔机三辊定心位置控制方法的应用

通过控制三辊定心装置执行机构液压油缸的位置,实现控制其三个导向辊的位置;为了提高控制质量,参考位实时修正,顶杆位控制采用变参数PI控制和软压下相结合的控制方法,毛管位控制采用变参数PI控制方法,油缸的线性位置传感器发生故障时,采用模拟轧制的控制方法。     

热连轧精轧机组活套控制模型应用分析

热轧精轧机组控制系统提供了活套常规控制模型及活套逆线性二次型控制模型(ILQ控制模型),为方便操作人员选择,对活套控制模型的控制思想和对带钢板形控制的影响进行了分析。活套高度和角度的高精度控制是精轧机组轧制板带平衡物流的有效手段。活套ILQ控制模型引入活套角度和张力两个变量闭环控制,对于板形控制和轧机辊缝控制大有裨益。     

连退生产线立式活套控制方法

针对连退生产线立式活套的特点,从电气控制的角度着重阐述活套的结构组成和控制方法。以入口活套为例,结合PLC和矢量传动控制原理框图,详述了立式活套的控制原理及实现方法,主要包括基于套量控制的活套速度控制、基于速度叠加的活套张力控制、基于速度补偿的双活套平衡控制。这些方法使得活套的套量控制精准、张力控制平稳、平衡控制稳定。     

冷连轧机日立AGC控制系统的研究

介绍了AGC控制基础知识,以马钢2130酸轧冷连轧机为例,选取日立AGC控制中的轧机弹性系数控制(BISRA)、前馈控制(FF)、反馈控制(FB)、史密斯预估控制(Smith)、轧辊偏心控制(REC)、秒流量控制(MASS Flow AGC)、动态变规格(FGC)和控制加速/减速补偿控制(ACC/DEC compensation)进行分析,对日立控制模型的研究有一定参考价值。     

铜冶炼余热锅炉给水系统自动控制的实现

以铜冶炼余热锅炉给水系统为对象,根据其生产工艺对给水系统控制的特殊影响以及系统的复杂性,设计了有效的控制方案,主要有汽包水位控制、汽包蒸汽压力控制、除氧器水位及压力控制、水泵联锁及给水压力控制,还有若干非常规调节,包括变PID参数控制和特殊规则控制等。其中,汽包水位控制分为常规控制和结合现场经验开发的特殊控制策略,针对这些控制策略编制了相应的控制程序。生产实践结果表明,这些控制方案均取得了良好的控制效果,实现了铜冶炼余热锅炉给水系统的自动控制。     

铝冷连轧中的自动控制功能

本文介绍了在铝冷连轧机中的传动控制功能、成组控制功能和工艺控制功能,特别介绍了对最终质量影响较大的自动厚度控制和板型控制等控制功能。     

论企业技改工程项目投资控制

技改工程项目投资控制必须坚持系统控制,全过程控制和全方位控制.也应将主动控制与被动控制有机结合而动态地进行控制.必须对投资控制目标进行合理的规划并制定相关的计划,合理而有效的组织是投资控制的重要保障.     

热连轧地下卷取机助卷辊控制

主要从助卷辊与卷筒的几何关系描述了助卷辊辊缝与液压缸行程之间的关系,这是位置计算及控制的基础;综述了助卷辊压力控制与位置控制,分析了在AJC控制过程中压力控制与位置控制的原理以及在标定过程中压力控制与位置控制的方法。     

Application of Centralized and Decentralized Control to Building Structure: Analytical Study

This paper presents both the centralized and decentralized control strategies by using semiactive control devices (magnetorheological dampers) for building structural control under seismic excitations. The control algorithms used in this study only focus on the linear quadratic Gaussian control theory with acceleration measurements as feedback signals. In the centralized control, the control force is generated directly from the measurement in each degree of freedom, while in the decentralized control, only measurement from local subsystems is used to calculate the control force with respect to the locations of control devices and measurements. Four groups of centralized/decentralized control algorithms are studied: fully centralized control, fully decentralized control, half-centralized control, and partially decentralized control. The ASCE 20-story benchmark building is selected as an example to evaluate the control performance among different control strategies.     

Longitudinal analysis of specific domains of internal control and depressive symptoms in patients with recurrent cancer.

The relation between perceptions of control and depressive symptoms was examined in a longitudinal study of patients with recurrent cancer. Five domains of control (self-blame, control over cancer onset, control over symptoms, control over the course of the illness, and overall control over life events) were found to be independent of one another. In cross-sectional analyses, depression symptomatology was negatively correlated with illness course control, symptom control, and overall control. Cross-lagged longitudinal analyses using structural equation modeling suggested only onset control and overall control were significantly associated with depressive symptomatology over the 8-month interval. Greater baseline onset control predicted greater follow-up depression, whereas higher baseline depression predicted lower follow-up overall control. The importance of developing and using domain-specific measures of control and investigating the association of control and adjustment in longitudinal analysis are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Flatness and Profile Integration Control Model for Tandem Cold Mills

 Using the effective matrix methods of flatness and profile control synthetically, the flatness and profile integration control scheme for tandem cold mills is built in order to increase flatness and profile control precision of tandem cold mills. Corresponding control strategies are adopted for various control objectives of different stands and the coordination control strategies of various stands are given, which makes the on-line flatness control cooperate with on-line profile control and implements the parallel control of different stands. According to the measured flatness and profile data of some 1550 mm tandem cold mills, the control scheme is verified and the result indicates that the scheme has high flatness and profile control precision with steady and reliable control process. A new way and method is supplied for researching shape control of tandem cold mills.     

120t转炉煤气干法除尘控制系统

针对莱钢120t转炉煤气干法除尘系统，简要介绍了其控制系统的硬件配置，详细阐述了蒸发冷却器喷水预设定控制、出口温度自学习控制、静电除尘器电场自记忆控制、转炉烟罩微差压阻尼控制、输灰系统双摆阀逻辑控制、引风机吸气自选择控制、切换站压力无扰动切换控制等功能。     

热连轧层流冷却系统的控制模型及控制策略

主要介绍了热轧带钢层冷系统中的控制模型及控制策略，包括液位控制、目标卷取温度的前馈控制和带有Smith预估器反馈控制等。其中通过液位控制可以得到稳定的液位，这对保持集管流量的稳定和上位机预设定的精度都是非常重要的。卷取温度的前馈控制和反馈控制对卷取温度控制精度的提高是必不可少的手段。这些控制模型和控制策略已经在工厂中得到应用，并且取得了很好的控制效果，说明这些控制模型和控制策略可以广泛应用于热连轧厂的冷却系统中。     

Smith预估自适应FuzzyPID控制器在乳化液温度控制系统中的设计

分析乳化液温度控制因时滞因素对系统造成的严重影响,提出采用模糊控制、PID控制和Smith预估方法相结合的控制方案,使系统的控制不仅有较好的鲁棒性和控制精度,而且对时滞长、非线性因素明显的控制对象亦有较好效果。MATLAB的Simulink软件仿真结果显示,该控制方案明显优于单一的模糊控制和PID控制,能够达到预期效果。     

广义预测控制在泵池回路中的应用

广义预测控制融合了预测控制和自适应控制的优点,是自适应控制中另一类型的预测控制方法,易于在线估计参数,以实现自适应控制。磨矿生产中,泵池回路控制是一个复杂的慢时变动态过程控制,具有很强的非线性、强耦合、大滞后、强干扰等特性,而传统的PID控制算法很难达到理想的控制效果和较高的自动投运率。为此,针对泵池控制回路的特点,提出基于模型性能指标和加权系数的广义预测控制算法,建立了泵池控制模型,并于2010年将该模型应用于金川选矿厂磨矿生产的泵池回路控制。实际工业应用表明,这种广义预测控制具有较强的适应性和较高的控制精度,控制效果优于传统PID控制算法。     

Primary and secondary control over age-related changes in physical appearance

Beliefs about appearance-related changes due to aging were used to test the effects of perceived control and secondary control (acceptance) in a sample of 412 young, early-middle-age, and late-middle-age college-educated adults. Mean difference in aging-related appearance control and hypotheses regarding the adaptiveness of primary and secondary control were examined. Primary control over aging-related appearance was lower in older adults and secondary control was higher. In addition, the results indicated support for the Primacy/Back-Up Model that primary perceived control is important at all levels of actual control. Those with stronger beliefs in their primary control were less distressed. Secondary control served a back-up function in that it was related to less distress only for those who had medium or lower beliefs in primary control. The implications of these findings, that primary control may be advantageous even in low-control circumstances, are discussed.     

房地产项目成本控制分析

成本控制和管理历来是房地产开发项目的重心.通过分析成本的来源,结合实践从五个关键控制点展开论述,即土地开发及相关费用控制、规划设计控制、合同控制、工程预(决)算控制、甲供材料控制.     

高炉鼓风机的喘振保护和自动调节系统

防喘振控制和定风压/定风量控制是鼓风机组的两个重要控制功能,其中防喘振控制是高炉鼓风机安全控制系统;定风压/定风量控制是使高炉实现稳定、经济、可靠运行的重要控制,阐述了鼓风机控制系统的各类方案。