共查询到18条相似文献,搜索用时 156 毫秒
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对带钢层流冷却的传热过程进行了分析,以此作为层流冷却控制的传热模型和自学习模型的理论依据,给出了带钢厂热轧机组层流冷却在线控制的传热和自学习模型的算法,从数学模型的角度对控制模型的实际运行结果进行了分析. 相似文献
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带钢厂热轧机组层流冷却数学模型 总被引:11,自引:0,他引:11
对带钢层流冷却的传热过程进行了分析,以此作为层流冷却控制的传热模型和自学习模型的理论依据,给出了带钢厂热轧机组层流冷却在线控制的传热和自学习模型的算法,从数学模型的角度对控制模型的实际运行结果进行了分析。 相似文献
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热轧带钢层流冷却温度控制模型的应用分析 总被引:1,自引:0,他引:1
工业大学金属材料与加工重点实验室, 安徽 马鞍山 243002) 摘要:在带钢热轧后的冷却过程中,热轧带钢卷取温度的数学模型是至关重要的。介绍了某热轧带钢厂的卷取温度控制数学模型,针对传统的热轧带钢层流冷却卷曲温度控制中数学模型的固有缺陷,分别采用了差分方程和有限元数值模拟的方法,建立带钢厚度方向上的温度场。对测得的数据进行了分析,结果表明:在考虑带钢与介质的热交换的同时再考虑带钢内部的热传导大大提高模型的预报精度,为定量地描述计算值与实测值之间的偏差提供了依据。 相似文献
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详细介绍了层流冷却设自动控制系统,对预设定模块进行了前馈补偿;考虑模型的不确定性和大时滞特性。采用模糊Smith预估器提高了反馈控制的精度。通过系统现场调试结果分析,应用该系统可以将带钢卷取温度的精度控制在±8℃之内。大大提高了带钢的性能。 相似文献
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冷却控制策略的好坏对带钢的力学性能至关重要,对冷却控制策略的评价是一个值得研究的问题。在对带钢冷却实际过程进行分析的基础上提出了一个带钢冷却控制过程的仿真方案。该仿真方案能再现生产过程中温度控制的实时数据和控制效果,为带钢冷却控制程序模块的运行情况提供了一种离线的调试和分析手段,对研究冷却控制策略、改进冷却控制系统有着重要意义。 相似文献
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HANBin LIUXiang-hua WANGGluo-dong SHEGuang-fu 《钢铁研究学报(英文版)》2005,12(1):12-16
Therearethreemajordifferencesbetweenthenewlydevelopedhotstripcoolingsystemandthecon ventionalsystem .Firstly ,newtemperaturemathemat icalmodelisdevelopedwithmoreaccurateconsidera tionsontemperaturedependenceoftheheattransfercoefficient,phasetransformation… 相似文献
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针对连铸生产过程中的二冷配水问题,建立了铸坯的凝固传热数学模型。通过实时模拟计算铸坯的温度场,并与PID控制技术相结合,开发了在线二冷控制模型。模型能自动根据钢种、铸坯规格及工艺参数的变化动态调整二冷控制水量,将铸坯的表面温度控制在工艺目标值附近。通过设计合理的控制系统架构,确保了二冷控制系统的稳定性及可靠性。在线测温结果表明,模型具有很高的计算精度。当拉速、浇注钢水过热度变化时,模型能快速将水量调整到目标值,速度快且超调小,从而确保铸坯的表面温度跟踪误差始终限制在较小范围内;当浇注过程处于相对稳态时,铸坯的表面温度保持在目标值。目前,模型已经应用于宝钢内外的多台连铸机,应用效果良好。 相似文献
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Ultra-fast cooling (UFC) is an advanced technology in hot rolling field. Through this technology, great changes on the run-out table are produced in the strip cooling process. In order to adapt to these changes, a new generation of hot strip cooling control system after rolling was developed based on the UFC basic principle. The system can not only accomplish temperature of UFC delivery side, coiling temperature, cooling rate, etc, and multi-objective accuracy control, but also offer more flexibility and new attractive possibilities in terms of cooling pattern on the run-out table, which could be of prime importance for the production of some difficult steels. In addition, through the time-velocity-distance (TVD) profile prediction combined with speed feed-forward control and coiling temperature feedback control, the coiling temperature control precision can be effectively improved during accelerative rolling in the system. At present, the system has been successfully used in the conventional strip production line and CSP short process production line, and its application effect is perfect. 相似文献
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Flatness is an important equality indicator of strip rolling and roll sub-sectional cooling is an important method for flatness control, especially for high order flatness component control. It is very hard to build the mathematic model of roll sub-sectional cooling because of its characteristics of nonlinearity, hysteresis quality and strong coupling etc. In order to improve the control effect of roll sub-sectional cooling control model, the roll sub-sectional cooling adaptive fuzzy control model based on fuzzy model inversion is built according to the separation principle of fuzzy form on the basis of the conventional fuzzy control model, where the parameters of the fuzzy controller can be dynamically regulated according to the change of rolling conditions. Simulation experiment results of the model indicate that the proposed roll sub-sectional cooling adaptive fuzzy control model based on fuzzy model inversion has high control precision and rapid response speed with strong self-learning and anti-interference capacity and a new method is provided for high-precision flatness control. 相似文献