辊底式连续热处理炉在线控制模型的研究与应用

以辊底式连续热处理炉为研究对象，建立了连续加热和摆动加热过程钢坯二维非稳态传热在线控制数学模型，并与现场实测数据比较分析。表明所建立的数学模型是正确可信的，该模型可以确定在不同的热处理工艺下不同规格和不同钢种的钢坯的最佳运行方式和加热制度，由此开发的辊底式连续热处理炉在线优化控制系统已成功地在某公司应用。     

高温空气燃烧技术发展及其应用

本文总结了高温空气燃烧技术在中国钢铁工业中的应用及发展情况,并以HTAC加热炉的热工特性为例,通过分析HTAC加热炉内燃烧与钢坯加热过程的特点,基于数值模拟方法,研究了HTAC加热炉内多烧嘴喷射射流的卷吸、燃烧现象以及钢坯在炉内的加热过程。     

探究步进式加热炉液压系统的设计及其原理

作为热轧带钢生产中的关键部分，加热炉是将初轧板坯或连铸加热至轧机所需温度，确保板坯产量与加热质量符合轧制要求的一种低耗能热工设备。由于轧机尺寸与能力的不断加大及降耗节能的要求，使得新型板坯加热炉结构越来越复杂，且板坯装备水平也越来越高，传统推钢式加热炉逐渐被具有优良性能的步进式加热所取代。     

二通插装式电液比例系统在步进粱式加热炉液压系统中的应用

二通插装式电液比例系统在步进粱式加热炉液压系统中的应用大连液压件厂林树勤孙普步进粱式加热炉是冶金企业轧钢车间比较先进的一种加热炉，它与传统的推钢式加热炉相比，具有加热能力大，加热质量好，自动控制程度高，加热周期短，产量高，寿命长等优点，但其设计、制造...     

一种螺旋盘管的优化设计

为了提高国产大流量除冰液加热系统的效率,选择系统中的主要加热元件光滑螺旋盘管(简称光滑盘管)进行优化。优化方法是螺旋盘管管壁向内凸起形成环形肋,新管称为横纹螺旋盘管(简称横纹盘管)。采用数值模拟研究了横纹螺旋盘管的传热特性,结果表明:横纹盘管比光滑盘管传热性能更好,当环形肋深度在0.05D~0.075 D(D为管截面直径)范围时,横纹盘管传热强化效果较优。     

板坯加热炉控制系统的研究与应用

详细介绍了以过程控制技术与基础自动化控制系统相结合的加热炉自动燃烧控制技术,其中过程控制级实现了炉内钢坯加热物理过程的数学模型,基础自动化控制级可以方便地将主要加热工艺参数自动设定调节到最佳状态,使加热炉更节能、高效、稳定地运行。     

换挡离合器摩擦片温升变化有限元分析

接合过程中摩擦片滑动摩擦发热是换挡离合器摩擦片失效的主要原因。建立了摩擦片的二维传热模型,分析换挡离合器接合过程中热传导二维温度场及各种边界条件,应用Ansys有限元软件对换挡离合器二维温度场进行了计算机模拟,在此基础上对结果进行了讨论和分析,为换挡离合器设计,研究进行理论准备。     

单轴滚塑成型传热过程的数学建模【摘要】

阐述了滚塑成型技术的基本原理、工艺特点。以单轴滚塑成型实验为依据，对工艺过程进行了适当简化和假设，着重对粉料在加热及熔融状态下的物理过程进行了分析，详细提出了单轴滚塑成型传热过程的数学模型，对模具加热时间、粉料熔融时间、熔融温度场时间函数、半径函数及温度场分布进行了求解。     

YH—11高温高辐身远红外节能涂料

在工业加热炉中,工件是通过传导、对流和辐射综合传热方式获得热量的。但由于传导、对流传热需通过介质进行,因而会有很多能量损耗于加热介质和介质流动过程中。而辐射传热是以电磁波形式传递的,空气中的氧气和氮气对辐射很少吸收,能量损失很少,热效率较高。因此,近年来国内外都十分重视采用强化辐射传热即红外加热的途径来节省能源。红外辐射涂料(涂层)在红     

换档离合器瞬态温度数值模拟

针对引起自动变速箱换档离合器摩擦片失效的主要原因---接合过程中摩擦片滑动摩擦发热,建立摩擦片的二维传热模型,详细分析换档离合器接合过程中热传导二维温度场的各种边界条件,应用Peaceman-Rachford有限差分法对换档离合器二维温度场进行计算机模拟,并对结果进行分析与讨论,为换档离合器的设计及研究提供理论依据.     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.