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具有偏心补偿功能的P-AGC系统 总被引:3,自引:0,他引:3
本文论述了一种具有轧辊偏心补偿功能的压力AGC(P-AGC)系统。它借助于自适应数字陷波滤波器提取偏心信号,消除偏心影响。计算机仿真结果表明,该系统控制精度比传统P-AGc系统的控制精度提高了60%以上。 相似文献
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针对天钢中厚板精轧机轧制过程中厚度控制系统产生的轧辊偏心问题,对其进行系统的分析。根据轧辊偏心高频周期波的特点及其与辊缝、轧制力、带钢厚度的关系,采用傅里叶级数分析算法对其进行补偿,将其应用于天钢中厚板的厚度控制系统中,很好地避免了AGC系统的误操作,提高了板材出口厚度的精度以及产品的质量。 相似文献
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轧辊偏心是冷连轧过程中导致带钢厚度偏差和质量缺陷的重要因素之一,针对轧辊偏心特征由于机架间的耦合作用和累计效应难以提取的问题,提出基于稀疏自适应匹配追踪(sparsity adaptive matching pursuit, SAMP)的偏心诊断方法。首先根据轧辊偏心模型构建偏心特征冗余字典,采用正交匹配追踪(orthogonal matching pursuit, OMP)算法将厚度数据进行稀疏分解,提取轧辊偏心特征。其次,采用匹配测试方法预测初始稀疏度,并通过迭代估计偏心和噪声的能量自适应地确定最优稀疏度,对偏心信号进行去噪。最后重构偏心信号并进行频谱分析,辨识各机架的轧辊偏心状态。经过仿真和实验验证,本方法比小波分析方法对早期偏心故障有更好的诊断效果,诊断结果为监控轧辊工作状态、优化换辊周期提供了可靠的依据。 相似文献
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The hydraulic roll bending control system usually has the dynamic characteristics of nonlinearity, slow time-variance and strong outside interference in the rolling process, so it is difficult to establish a precise mathematical model for control. So, a new method for establishing a hydraulic roll bending control system is put forward by cerebellar model articulation controller (CMAC) neural network and proportional-integral-derivative (PID) coupling control strategy. The non-linear relationship between input and output can be achieved by the concept mapping and the actual mapping of CMAC. The simulation results show that, compared with the conventional PID control algorithm, the parallel control algorithm can overcome the influence of parameter change of roll bending system on the control performance, thus improve the anti-jamming capability of the system greatly, reduce the dependence of control performance on the accuracy of the analytical model, enhance the tracking performance of hydraulic roll bending loop for the hydraulic and roll bending force and increase system response speed. The results indicate that the CMAC-PID coupling control strategy for hydraulic roll bending system is effective. 相似文献
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德国西马克SMS CSP轧机自动换辊控制系统采用顺序控制,通过精确控制每个子系统,实现无人确认操作状态下的换辊功能。原设计换辊系统中,因支承辊、工作辊平衡回路为力控模式,第一步抽辊和第四步推辊步骤存在支承辊下降时间较长,下降"到位"信号反馈较慢的问题,增加了换辊时间。通过优化添加支承辊平衡缸位置控制模式及工作辊节流阀开口度调整,缩短自动换辊时间40 s,提高了生产线的作业率。 相似文献
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张力辊的张力控制在冷轧连续退火线中应用十分普遍,也是不可缺少的。T400工艺板可以实现张力辊的建张、张力闭环、负荷平衡、断带检测、电机常用的逻辑控制等,且在使用上完全以参数化编程,可以广泛应用在冷轧连续退火线的控制系统中。实践表明以T400工艺板为核心的直接张力控制系统具有结构简单、张力控制精度高、故障率低、维护方便等特点。 相似文献
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A field investigation was carried out with an instrumented vibratory roller compactor to explore the relationship between vibration characteristics and underlying soil properties, namely soil stiffness. The roller was outfitted with instrumentation to monitor drum and frame acceleration, as well as eccentric excitation force. Multiple consecutive passes were performed over six test beds on an active earthwork construction site to capture changes in roller vibration during compaction. Using lumped parameter vibration theory, soil stiffness was extracted from the roller data (drum and frame acceleration and drum phase lag). Both drum acceleration and drum phase lag were found to be very sensitive to changes in underlying soil stiffness. The drum–soil natural frequency of the coupled roller–soil system varied considerably and increased with compaction-induced soil stiffening. Phase lag always decreased with increasing soil stiffness, whereas drum acceleration trends depended on whether the excitation frequency was less than or greater than resonance. Roller-determined soil stiffness was found to be a function of the eccentric force, and heterogeneity in moisture, lift thickness, and underlying stiffness has a considerable affect on roller vibration behavior. When used as a proof roller, the instrumented roller identified soft areas in the embankment that were not identified by a static proof roll test. 相似文献