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铝板带材的厚度公差,是冷轧板带的重要质量指标。厚控系统的好坏对于减少板带材的厚度超差废品、提高成品率、减少金属消耗关系很大;轧机采用较好的厚控系统对于提高企业经济效益具有极为重要的意义。 相似文献
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鉴于传统的故障诊断方法对复杂系统或设备进行故障诊断时,有诊断速度慢、对多故障同时发生的情况难以准确定位等缺点,提出了基于故障字典法和神经网络理论的综合故障诊断方法;在叙述该综合诊断方法的基础上,以某型飞机自动驾驶仪飞控盒的主要故障为例,分析说明了运用该方法进行设备故障诊断的具体过程,并进行了仿真研究;实现了对此设备单故障和多故障的快速准确定位;结果表明该综合故障诊断方法解决此类故障诊断问题是有效的. 相似文献
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基于信息融合原理的智能故障诊断模型 总被引:4,自引:0,他引:4
针对传统设备故障诊断方法中存在的局限性,文章在对设备智能故障原理和方法初步探索和研究的基础上,提出了基于信息融合原理的智能故障诊断方法。该方法利用多源异质传感器采集设备的各种特征信息,并采用模糊神经网络融合诊断中心作为诊断判决的执行机构,从而实现准确诊断设备故障诊断原因以及对设备运行工况进行态势评估的过程。并且通过对单传感器与多传感器信息融合诊断结果的对比表明多传感器信息融合诊断比单个传感器具有更高的准确性。 相似文献
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带钢热连轧过程控制是钢铁制造过程极其复杂的过程,近年来随着市场对带钢产品质量要求的日益提高,提高热连轧带钢质量具有广泛的经济和社会效益。为了确保热连轧过程安全运行,同时提高产品质量,有必要对热连轧过程的异常状况或故障进行检测、诊断和消除。以多元统计过程监控技术(MSPM)为理论指导,以主元分析(PCA)和偏最小二乘方法(PLS)为依托,研究和分析了PCA和PLS以及二者与核函数结合构成的核主元分析方法(KP-CA)和核偏最小二乘方法(KPLS)在热连轧机质量相关的故障分析与检测,通过现场数据及实验验证,在厚度质量相关的故障检测与诊断中取得较好的效果。 相似文献
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对于系统状态检测与故障诊断,传感器自身故障的及早发现很重要。本文提出了一种基于神经网络和冗余率计算的传感器组故障监测与诊断的新方法。该方法先用RBF神经网络对传感器组中的各个输出进行预测,若预测值与输出值发生较大的偏差,可能是传感器故障或设备故障,运用传感器之间的冗余率,进一步判断传感器是否发生故障,进而采用对应的诊断策略。 相似文献
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利用多信号模型可简明表征系统因果关系以及盲源分离算法可提取系统本源信息的特点, 提出一种新颖有效的复合故障诊断方法. 首先, 针对复合故障下多信号模型出现冗余测试和故障模糊组的情况, 应用盲源分离算法实现测点信息的盲分离, 基于盲信号重建多信号模型的因果结构; 其次, 理论分析了该方法对复合故障具有良好的可诊断性. 轧制过程AGC系统的实验结果表明, 所提出方法对双复合故障和部分多复合故障的隔离和定位准确率可达100%.
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基于KPLS和TD的热连轧精轧末架微调AGC 总被引:1,自引:0,他引:1
热连轧传统的厚度控制方式主要依靠精轧机组下游机架的监控AGC(automatic gauge control)来消除厚差,易造成末架调节量过大,对板形产生非常不利的影响.为此提出一种基于KPLS(kernel partial least squares)和TD(tracking differentiator)的热连轧精轧末架微调AGC,通过对前一卷带钢轧制信息进行非线性特征抽取,找出F5,F6机架间过程变量的关系,从而可以在F6机架保持辊缝和压力基本不变的前提下,仅通过调节F5机架的辊缝而使厚度精度达到控制要求.现场实验证明了这一观点. 相似文献
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To improve the quality of strip thickness, synchronisation control is investigated for cold rolling mills driven by dual-cylinder electro-hydraulic servo systems. Realising synchronised control in hydraulic automatic gauge control (HAGC) systems of cold rolling mills has challenges with not only the inherent nonlinearities of hydraulic servo systems and uncertainties of load variation but also measurement delay of strip thickness. Since all states are not measurable in practice, output feedback robust synchronisation control problem should be addressed for uncertain nonlinear systems with output delay. Thus, a reduced-order observer-based robust synchronous controller is presented by employing Lyapunov functional stability theory. The controller designed by incorporating the integral of the position synchronisation error of two pistons into state variables successfully guarantees asymptotic convergence to zero of both tracking errors and synchronisation error simultaneously regardless of the nonlinearities and uncertainties as well as the measurement delay. Simulation results in a model obtained from a real cold strip rolling mill demonstrate the effectiveness of the approach. 相似文献
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液压轧机厚度自动控制的设计 总被引:1,自引:0,他引:1
随着轧制理论的不断深入研究 ,自动检测与控制技术不断发展 ,特别是高性能电液伺服伐在轧钢工业上的应用 ,在机械、液压、电气及自动控制的密切配合下 ,使液压轧机的发展达到了一个新的水平。而液压 AGC(厚度自动控制 )是液压轧机的核心部分 ,它关系到液压轧机的产品精度和轧机的自动化水平。介绍了采用预控的方法来消除入口带材厚度对出口厚度的干扰 ,以及利用监控的方法来准确锁定成品尺寸。 相似文献
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The setup and control of the finishing mill roll gap positions required to achieve the desired strip head thickness as measured by the finish mill exit X-ray gauge sensor is made by an intelligent controller based on an interval type-2 fuzzy logic system. The controller calculates the finishing mill stand screw positions required to achieve the strip finishing mill exit target thickness. The interval type-2 fuzzy head gage controller uses as inputs the transfer bar thickness, the width and the temperature at finishing mill entry, the strip target thickness, the width and the temperature at finishing mill exit, the stand work roll diameter, the stand work roll speed, the stand entry thickness, the stand exit thickness, the stand rolling force, and the %C of the strip. Taking into account that the measurements and inputs to the proposed system are modeled as type-1 non-singleton fuzzy numbers, we present the so called interval type-1 non-singleton type-2 fuzzy logic roll gap controller. As reported in the literature, interval type-2 fuzzy logic systems have greater non-linear approximation capacity than that of its type-1 counterpart and it has the advantage to develop more robust and reliable solutions than the latter. The experiments of these applications were carried out for three different types of coils, from a real hot strip mill. The results proved the feasibility of the developed system for roll gap control. Comparison against the mathematical based model shows that the proposed interval type-2 fuzzy logic system equalizes the performance in finishing mill stand screw positions setup and enhances the achieved strip thickness under the tested conditions characterized by high uncertainty levels. 相似文献
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热轧过程自动控制系统主要任务是对热轧生产线全线的工序进行实时跟踪、数据采集和工艺参数优化,获得满意的产品尺寸精度和各项性能指标.作为一种全新的热轧过程自动控制模式的京唐热轧2250mm过程自动控制系统以控制系统运行稳定、功能设置灵活实用、产品质量控制精确三大技术特点出发,实现先进的生产过程自动控制. 相似文献
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提高AGC厚度控制精度及其百分比的研究 总被引:3,自引:0,他引:3
为进一步提高带坯全长厚度控制精度,需提高本体头部命中率,以便绝对AGC投入。介绍了采用动态设定DSU、Taper Head、TaperTail控制算法以维持轧制力恒定来保证板形。为了能够在热轧生产线上应用,通过对造成轧制力偏差原因的分析,依据实际现场数据对不同轧制规程进行计算,给出了DSU穿带的约束条件,避免了穿带自适应误动作。在本体厚度控制中,提出了基于相位补偿的轧辊偏心控制方案,分析其特点及基于相位补偿控制的优越性,并给出实际的F3机架轧制力滤波效果。实际应用结果表明,该控制算法是有效的。 相似文献
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W.J. Edwards 《Automatica》1978,14(5):429-441
The ideal characteristics of a strip thickness control system operating on the upstream stands of a tandem mill are defined. The historical development of tandem mill control system design is described and several recently published control systems are compared on the basis of how well they achieve the ideal characteristics.An entry end control system is then described which combines a stand 1 thickness gauge feedback system with a feedforward controller employing non-interactive concepts. A modified gaugemeter system is recommended for the first stand of hydraulic mills which incorporates an additional force control loop for minimising the effects of roll eccentricity. Typical computer simulation results are presented. The final system has excellent error attenuation properties with a minimum of complexity and is suited to implementation on tandem mills rolling sheet or tinplate and with electric or hydraulic rollgap positioning.Preliminary performance results from a recently upgraded 5-stand cold mill are included which confirm the merits of the control system described. Brief details are given of other significant features in this system. 相似文献