湿式陶瓷球磨机设计中经验数值选取的研究

湿式陶瓷球磨机是广泛用于生产陶瓷原料的细磨设备,根据多年陶瓷机械设计的实际经验,在保证生产效率的同时,为节约电能消耗、提高设备的可靠性和降低设备成本,对湿式陶瓷球磨机设计中主要技术参数选择、主要尺寸设计、传动方式选定和结构设计的经验数值选取进行了深入研究和归纳总结,以供参考。     

基于风资源测评的化德风电场二期工程的风机选型初选规划

大规模利用可再生能源,是世界各国发展的重要战略规划.其中,发展最快的是风能.占全国风力资源量39.9%的内蒙古自治区,成为了我国风能开发的前沿阵地.位于内蒙古化德县内的华能国际化德大地泰泓风电场,在已有风电场建设的基础上,规划建立二期工程.本规划运用风资源测评方法,借助化德县气象站作为风电场测风的参证气象站,利用多年的气象数据,对1260号测风塔的数据进行了修正,同时把风资源测评和风电场经济性统一起来,完成了化德风电场二期工程的风机选型初选规划.     

Multi-objective optimization of rolling schedule based on cost function for tandem cold mill

In terms of tandem cold mill productivity and product quality, a multi-objective optimization model of rolling schedule based on cost fimction was proposed to determine the stand reductions, inter-stand tensions and rolling speeds for a specified product. The proposed schedule optimization model consists of several single cost fi.mctions, which take rolling force, motor power, inter-stand tension and stand reduction into consideration. The cost function, which can evaluate how far the rolling parameters are from the ideal values, was minimized using the Nelder-Mead simplex method. The proposed rolling schedule optimization method has been applied successfully to the 5-stand tandem cold mill in Tangsteel, and the results from a case study show that the proposed method is superior to those based on empirical formulae.     

基于惩罚项的热连轧轧制规程多目标函数优化

为了解决传统热连轧负荷分配优化普遍采用约束方法进行求解时求解步骤繁琐、不容易获得最优解的问题,提出了一种惩罚函数算法.通过引入函数惩罚项,将多目标函数约束求解问题转化为无约束求解问题.建立了带有惩罚项的轧制力、板形、功率和温度的单目标函数,进而采用线性加权求和法建立了综合多目标函数.利用Nelder和Mead单纯形解法则进行求解,简化了求解的步骤,最终得到了兼顾轧制力平衡、板形最优及温度合理的负荷分配方案.实际应用效果表明,与传统负荷分配方式相比,基于多目标优化得到的轧制规程更符合实际生产要求,具有良好的应用前景.     

Algorithm design and application of novel GM-AGC based on mill stretch characteristic curve简

As the spring equation is limited to the accuracy of mill stiffness and the linearity of the mill spring curve, the traditional gaugemeter automatic gauge control （GM-AGC） system based on spring equation cannot meet the requirements of practical production. In allusion to this problem, a kind of novel GM-AGC system based on mill stretch characteristic curve was proposed. The error existing in calculating strip thickness by spring equation were analyzed first. And then the mill stretch characteristic curve which could effectively eliminate the influence of mill stiffness was described. The novel GM-AGC system has been applied successfully in a hot strip mill, the application results show that the thickness control precision is improved significantly, with the novel GM-AGC system, over 98.6% of the strip thickness deviation of 3.0 mm class can be controlled within the target tolerances of ±20 μm.     

Influence of surface roughness on flotation kinetics of quartz

Surface roughness of quartz particles was determined by measuring the specific surface area of particles. The wettability characteristics of particles were determined by measuring the flotation rate using a laboratory flotation cell. Experimental results show that the rod mill product has higher roughness than the ball mill product. For the particles with larger surface roughness, the flotation kinetics constant is also higher. Finally, empirical relationships between surface roughness (r) and the flotation kinetics constant (k) of quartz particles as k=A+Br+Cr ^0.5lnr+D/lnr+E/r and k=A+Br are presented, in which A, B, C, D and E are constants related to experimental conditions and mineralogical properties of mineral.     

一种FIR神经网络的在线学习算法在系统辨识中的应用

通过在指标函数中增加遗忘因子,提出一种FIR神经网络的在线学习算法．该算法具有随训练的样本进度即时更新权值的在线训练能力,与同类方法相比,因没有复杂的矩阵计算,使计算时间大大减少．编制了算法程序,对真实的六机架热连轧机试验数据进行了辨识,所耗用的计算时间远远小于实际数据的采样时间,验证了该算法的在线辨识能力．     

球磨机钢球磨损的一般数学模型研究

在生产实践中，球磨机的各工况条件参数不是恒定不变的，需要研究能反映球磨机生产工况条件参数变化的钢球磨损的一般数学模型．本文利用发数理论方法建立了这种模型，并讨论了模型求逆问题，给出了求逆问题的方法。     

散体流态运动自磨机的相似模拟

从散体流态运动自磨的概念出发，通过散体的动力学方程，导出了一组散体相似模拟试验的动力相似判据．给在重力和离心力场中粉碎的散体流态运动自磨机的动力相似模拟试验提供了必须的相似指标式．     

基于经验规则的水泥磨控制

应用泛布尔代数理论分析水泥磨控制规则,得到分层次的泛逻辑图和泛逻辑表达式,对应控制结构上的多级闭环负反馈控制,使得水泥磨规则控制器的设计实现从硬件到软件简单明晰,可靠性和性能指标更好。