泵站自动化技术的探讨

受国内泵站自动化水平低、运行管理和技术分析能力低下的限制,屡发的旱灾使工农业生产蒙受巨大损失,旱灾再次暴露陈旧的水利设施已不能满足社会发展的问题,在作为水利枢纽的大型泵站中引入自动化技术,可以有效提高设备运行效率和管理水平。结合我国目前泵站的实际,提出泵站自动化设计的方案,分析阐述自动控制技术在泵站中的具体应用。     

钨酚醛树脂连接炭/炭复合材料的工艺研究

以钨酚醛树脂为原料基体，添加适量的钨粉，对炭／炭复合材料进行连接试验，测试了不同温度处理后连接处的室温剪切强度。结果表明，经1500℃处理后连接处仍保持较高的连接强度，最高可达16．1MP。。利用XRD和SEM研究了接头的组成和形貌，并探讨了钨粉含量及热处理温度对接头强度的影响。     

短切炭纤维增强沥青基C/C复合材料的组织特征

利用新型、高效的模压半炭化成型工艺，在大气环境下制备出了短切炭纤维增强沥青基C／C复合材料制品，并借助光学显做镜和扫描电镜对其微观组织和断口形貌进行了观察。通过分析，解释了短切炭纤维增强沥青基C／C复合材料中炭纤维损伤的形成机制，提出了作为增强体相的短切炭纤维和焦炭颗粒与基体炭之间独特的界而结构模型。研究还表明：复合材料中明显存在着基体相和颗粒相一基体相的显微结构不仅呈层片状，而且层片状的结构好像数层桔子皮，将颗粒相包裹起来，这种“桔皮包裹”式的结构与炭纤维表面的POG结构基本相似。     

Effect of artificial tribological layer on sliding wear behavior of H13 steel

An artificial tribological layer was formed on the worn surface during sliding, through supplying MoS2 , Fe2 O 3 or their equiponderant mixtures onto the sliding interface of H13/GCr15 steels.The effect of this tribological layer on the wear behavior of H13 steel was studied.The worn surfaces and subsurfaces of H13 steel were thoroughly characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS); the wear mechanisms were explored.The research results demonstrated that tribological layer did not exist during sliding of H13 steel with no additive, but it formed with the addition of MoS2 , Fe2 O 3 or their equiponderant mix-tures.When there was no tribological layer, the wear rate rapidly increased with an increase of the load.In this case, adhesive and abrasive wear prevailed.As the additives were supplied, the artificial tribological layer was observed to be immediately formed and stably existed on worn surfaces.This tribological layer presented an obvious protective function from wear and friction.Hence, the wear rate and friction coefficient were significantly decreased.MoS2 as tribological layer seemed to present more obvious protective function than Fe2 O 3 .By supplying their mixture, the artificial tribological layer possessed not only the load-carrying capacity of Fe2 O 3 , but also the lubricative capacity of MoS2 .These two simultaneous capacities could improve the friction and wear properties of H13 steel further.     

滇东电厂汽轮机高压静叶积盐问题分析及处理

云南滇东发电厂4×600MW新建工程锅炉采用＂W＂火焰燃烧方式,一次再热,单炉膛平衡通风,自然循环,单锅筒亚临界参数锅炉。该工程于2004年3月开工建设,2007年5月4台机组全部投产。     

基于遗传算法的冷连轧机辊型配置优化系统的开发及应用

针对鞍钢冷轧厂四机架冷连轧机,开发出了以改善成品带钢板形质量为目标的冷连轧机混型配置综合优化系统。该系统采用了智能化的遗传优化算法,能同时优化连轧机各架轧辊的辊型曲线和辊型凸度,利用该系统优化设计的新的辊型配置方案在四机架冷连轧机上得到了应用,取得了良好的应用效果。     

装配式冷库温度场特性的实验研究

本文通过对装配式冷库在装货条件下温度场的实验研究,总结了库内温度场的分布规律,并分析了冷风机送风速度及库温控制对库内温度分布的影响。     

热解炭过渡层-中间相沥青基炭/炭复合材料的微观结构

借助偏光显微镜、扫描电镜、透射电镜对具有热解炭过渡层的中间相沥青基炭/炭复合材料的微观结构进行了研究。结果表明:材料的基体由热解炭和中间相沥青炭组成,在偏光显微镜下均呈现出光学各向异性。材料内部形成了多层次的界面结构,热解炭与纤维的界面连续,界面层内的石墨微晶择优取向度较高,晶格条纹排列规整;中间相沥青炭与热解炭界面不连续,为"裂纹型"界面,界面层内主要为非晶态碳。材料中炭纤维、热解炭、中间相沥青炭的石墨微晶大小逐渐增大,择优取向度逐渐增高,晶格条纹的排列逐渐规整。片层条带状结构的中间相沥青炭以及材料内的微裂纹平行于炭纤维轴向。     

双级矩阵变换器的自抗扰闭环控制

自抗扰控制是一种基于过程误差来减小误差的非线性鲁棒控制技术,适用于不确定性系统的控制.针对双级矩阵变换器(TSMC)系统的非线性强耦合特点,将自抗扰控制技术应用于TSMC的闭环控制中,建立了dq坐标系上TSMC的数学模型.根据模型的耦合、不确定性,引入自抗扰控制器,对系统内外扰进行观测和补偿.文中分析了自抗扰控制器ADRC各环节的功能原理、设计方法及参数整定规律.仿真结果表明,基于ADRC的闭环控制可保证TSMC系统在各种扰动下具有良好的动静态性能,验证了该控制策略的优越性.     

Dynamic Decoupling for Combined Shape and Gauge Control System in Wide Strip Rolling Process

The precision of profile and thickness is the most important target for wide strip rolling,but the coupling of profile control and thickness control is ignored in rolling schedule,which holds down the simultaneous quality improvement of profile and thickness.A cross-coupled process control model for combined shape and gauge control was developed on the basis of the fact that both controls for profile and thickness are realized by controlling the rolling gap.A dynamic decoupling controller was then proposed to decouple the model.Both the simulation results and the online production data are valid and ensure the quality of the decoupling controller.