紧凑式轧机变形规程优化设计

本文从紧凑式轧机的轧制变形特点出发,分析了其变形规程设计的主要特点和方法,讨论了限制其道次变形量的基本因素,给出了优化设计的目标函数和约束条件。指出,类似这种具有复杂约束的轧制变形问题采用混合罚函数法处理更为有效,并成功地采用该方法进行了变形规程的试设定。     

Dependence of Silicon Carbide Product Morphology on the Degree of Mechanical Activation

Mechanical activation before carbothermic reduction can substantially enhance the formation of SiC from SiO₂and carbon mixtures. However, the morphology (e.g., particles or whiskers) of SiC formed from mechanically activated SiO₂and carbon mixtures is dependent of the degree of mechanical activation and the condition of the subsequent carbothermic reduction. These phenomena are investigated and rationalized based on the increased reactivity of the reactants and SiC formation mechanisms.     

基于CBR和RBR混合推理的齿轮箱智能诊断技术

针对传统齿轮箱智能诊断系统获取知识的困难,提出了基于案例(case-based reasoning,CBR)和规则(rule-based reasoning,RBR)混合推理方式的智能诊断技术.在研究此2种推理技术优缺点的基础上,取长补短,合理地将其应用到轧机齿轮箱故障诊断工作中,提高了故障诊断的准确率和效率.针对传统案例检索中相似度算法的不足之处,提出了一种新的案例检索算法,有效地解决了传统的相似度算法检索案例不准确的问题.     

热连轧机工作辊热辊形仿真研究

采用差分法建立了轧辊二维瞬态温度场及热辊形的预报模型 ,可用于实际生产的在线热辊形预报 ;利用实际生产参数模拟轧制和空冷过程中的工作辊热辊形 ,计算结果与实测值相符 ;就不同条件下工作辊热变形规律进行了分析 ,对热轧生产的工艺安排、组织和热磨辊具有实际意义     

Genetic based sensorless hybrid intelligent controller for strip loop formation control between inter-stands in hot steel rolling mills

Safe operating environment is essential for all complex industrial processes. The safety issues in steel rolling mill when the hot strip passes through consecutive mill stands have been considered in this paper. Formation of sag in strip is a common problem in the rolling process. The excessive sag can lead to scrap runs and damage to machinery. Conventional controllers for mill actuation system are based on a rolling model. The factors like rise in temperature, aging, wear and tear are not taken into account while designing a conventional controller. Therefore, the conventional controller cannot yield a requisite controlled output. In this paper, a new Genetic-neuro-fuzzy hybrid controller without tension sensor has been proposed to optimize the quantum of excessive sag and reduce it. The performance of the proposed controller has been compared with the performance of fuzzy logic controller, Neuro-fuzzy controller and conventional controller with the help of data collected from the plant. The simulation results depict that the proposed controller has superior performance than the other controllers.     

权重自适应clonal选择算法及其应用研究

在求解两个目标以上的多目标优化问题时,基于Pareto支配的多目标进化算法多数需要较长的求解时间.基于固定权重的聚合函数方法求解速度快,但要确定一个适合待求解问题的合理权重是十分困难的,为了解决这一问题,将clonal选择算法与权重自适应方法相结合,提出了一种适用于多目标优化问题的权重自适应clonal选择算法.并将权...     

Recycle of valuable products from oily cold rolling mill sludge

Oily cold rolling mill （CRM） sludge contains lots of iron and alloying elements along with plenty of hazardous organic components, which makes it as an attractive secondary source and an environmental contaminant at the same time. The compound methods of ＂vacuum distillation ＋ oxidizing roasting＂ and ＂vacuum distillation ＋ hydrogen reduction＂ were employed for the recycle of oily cold rolling mill sludge. First, the sludge was dynamically vacuum distilled in a rotating furnace at 50 r/rain and 600℃ for 3 h, which removed almost hazardous organic components, obtaining 89.2wt% ferrous resultant. Then, high purity ferric oxide powders （99.2wt%） and reduced iron powders （98.9wt%） were obtained when the distillation residues were oxidized and reduced, respectively. The distillation oil can be used for fuel or chemical feedstock, and the distillation gases can be collected and reused as a fuel.     

中速磨煤机计算中若干问题的探讨(续)

目前工程设计中对ＭＰＳ、ＨＰ等中速磨煤机的计算基本上采用制造厂商提供的规范和方法，但在相同煤质条件下，按不同厂商计算方法所得结果可能出现明显的差异；另一方面，国内用以指导中速磨计算的一些规范也存在着不够明确之处，这些情况都给中速磨的选型、工程计算带来了困难。根据工程设计实践和对电厂试验资料的分析，对中速磨煤机出力计算、煤粉细度、出口风温和风工况等问题进行了讨论，提出了一些新的见解和建议     

热连轧精轧机组的板形最优控制

凸度和平坦度是板形控制的目标 ,也是对热连轧机工作辊的弯辊力进行设定和调整的基础。面向工业轧机 ,以板形方程为基础 ,研究提出了基于遗传算法的热连轧机板形最优控制。试验数据对比分析结果表明 ,使用该算法能够获得良好的板形 ,该控制算法是可行的     

1200冷轧机电气传动控制系统改造

本介绍了对1200冷轧机原模拟电气传动控制系统进行改造的范围、内容和主要技术、功能特点。通过改造，提高了设备装机水平和系统控制精度，故障率明显降低，原系统长期影响和困扰冷轧机生产效能、稳定运行和产品质量稳定的问题得以解决。