利用PLC检测多台电机转速的研究

通过利用西门子S7-300系列PLC的CPU模块、数字量输入模块、SICK电感式接近开关、西门子TP170触摸屏等电气元件,对轧钢线130台输入辊道电机进行转速检测,同时把电机转速实时显示在触摸屏上。通过PLC程序逻辑运算实现报警输出,解决了多台电机转速实时检测的难题,减少了轧钢生产过程中因电机转速失灵造成的轧钢质量缺陷。     

基于PLC的水处理自动控制系统

介绍了水处理装置的工作过程,采用西门子S7-200 PLC+触摸屏进行控制。重点分析了系统硬件设计、硬件线路连接、PLC和触摸屏软件设计。     

人机界面、位控模块在对中性测量仪中的应用

介绍了西门子TP070触摸屏、西门子S7—226PLC、西门子EM253位控模块在对中性测量仪中的应用。并简单阐述了这3种控制元器件的特点,阐明了触摸屏的优越性以及3种器件的应用给系统稳定性、操作性等方面带来的改善,并给出了PLC控制程序流程图。     

基于PLC的低压变频器集成监控系统设计

以低压变频器集成监控为背景,提出一种基于PLC和触摸屏组成的低压变频器监控系统设计方案,由西门子S7-200 PLC、西门子MP277触摸屏以及多台支持modbus RTU或USS协议的低压变频器组成。PLC一方面接收变频器的参数与状态信息,另一方面将需要处理的数据信息转化,并发送给触摸屏显示。经验证,该系统能够实现变频器的集成监控,提高了工业系统的自动化水平,减少了人工巡检的工作量。     

基于S7-300PLC与触摸屏的玻璃清洗机控制系统设计

通过对全自动中空玻璃清洗机工作流程和控制要求的分析,构建了以西门子S7-300PLC和TP177B触摸屏为控制核心、手动与自动一体的玻璃清洗机控制系统,实现了玻璃上片、清洗、吹干和下片等全过程的自动化生产,大大提高了玻璃清洗机作业的自动化水平和生产效率。     

基于PLC的小车自动配料控制系统设计

当前，工业生产正朝着智能化和自动化方向发展，为了实现某些工业生产配料方面的自动化，设计了小车自动配料控制系统。基于西门子PLC，完成了小车配料系统的硬件和软件设计，用触摸屏进行了仿真，使用博途TIA Portal软件、S7-1500 PLC和触摸屏技术，实现了系统自动检测用料需求、自动装料运料以及卸料的控制功能，安全可靠，节省了人力，提高了生产效率。     

基于触摸屏的柔性生产线物流运输控制系统的设计

基于柔性生产线中立体仓库和运输小车的结构及其可视化控制的要求,设计并实现了功能强大、界面友好的控制系统。控制系统硬件主要基于西门子SIMATICs7200系列可编程逻辑控制器（programmable logic controller, PLC ）,同时引入人机界面友好的触摸屏eview—MT5000;软件分别选用西门子Step7编程软件和EV5000触摸屏编程软件。控制系统经实验室模拟柔性生产线测试,结果表明设计的控制系统运行稳定可靠,实现了对立体仓库系统和运输小车的实时监视和控制。     

硬盘外壳平面度检测系统的研究与开发

介绍了西门子SIMATIC S7-200PLC、WINCC V6.0、西门子触摸屏等产品在国内首套硬盘外壳平面度及螺孔检测系统中的系统配置和网络结构;并从软、硬件设计方面叙述了对关键功能的成功实现。     

西门子PLC与ABB变频器之间模拟量控制的应用

从系统功能、硬件结构和软件设计3个方面,详细介绍了一种基于西门子S7-300PLC的调速系统。结合西门子MP277触摸屏,实现ACS800变频器的模拟量控制,并成功将系统应用在耐久性能试验设备上,运行效果良好。     

基于S7-300PLC的废沙回收再生控制系统设计

废沙为铸造固体废弃物的主要成份,废沙再生不仅能降低铸造企业生产成本还能减少铸造生产过程对环境的污染。使用西门子S7-300PLC作为基础,结合触摸屏技术,设计应用于铸造废沙回收控制系统,实现废沙再生。     

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...     

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.     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.     

Fractional order nonsingular terminal sliding mode control for flexible spacecraft attitude tracking

This paper investigates a fractional terminal sliding mode control for flexible spacecraft attitude tracking in the presence of inertia uncertainties and extern...     

奥氏体不锈钢表面双辉等离子渗锆的动力学

利用双辉等离子渗金属技术在0Cr18Ni9Ti奥氏体不锈钢表面制备了一层均匀、致密、呈良好冶金结合的渗锆合金层,并对1 060℃下的渗锆动力学进行了研究。结果表明:随着距锆合金层表面距离的增加,锆元素的含量呈梯度递减,扩散系数逐渐减小,而扩散激活能逐步增大;在1 060℃采用双辉等离子技术渗锆时,渗锆合金层表层的空位密度为2.945×(1012~1013)cm-2,与相同温度下采用常规渗金属工艺相比,提高了1~2个数量级。     

气化炉三维扫描测量与数据处理

以德士古气化炉耐火砖的内壁蚀损检测设备为基础,对采集到的点云数据做了进一步处理.通过对数据的筛选和剔除,实现了数据点的平滑降噪细化和精简.然后利用点云对整、网格划分和分色显示等方法,最终完成了内壁腐蚀情况的三维建模.重点讨论了点云数据的预处理及后处理的方法,并根据内壁耐火砖的腐蚀阈值,提出了一种气化炉内壁腐蚀区域的识别与分割方法.对耐火砖的腐蚀分析、气化炉的生产与维修提供了可靠依据,并在工程应用中获得了一致认可.