基于VR的MMD850轮齿式破碎机监控模型设计

使用基于虚拟现实模型技术VRML的三维描述实现生产线节点设备的网络拓扑三维数据模型,建立高效的拓扑关系数据库和模型数据库,通过JSP、XML、Java和VRML一体化的Web服务器,应用高级语言编程实现现场实时信号的三维自动生产线模型的实时变化,实现三维虚拟现实的实时仿真监视和控制系统。     

基于Agent的P2P网络管理研究

P2P是构建在物理网络上面的点对点网络,它改变了Internet以大网站为中心的格局,但同时也因节点对等的思想而面临着怎样有效对P2P实施拓扑管理的问题.本文在基于Asent的P2P网管模型结构分析的基础上,开展了对P2P网络管理中拓扑管理技术的研究.对于当前P2P网络拓扑结构的管理情况.构建了采用移动代理技术的P2P网络网络拓扑管理模型,从而能够有效提高P2P网络拓扑性能管理.利用构建层次式网络拓扑结构,使用移动代理来进行拓扑的发现,以降低拓扑管理效率低下而形成的大量数据流量.     

基于网络的分布式测控系统研究

测控系统越来越走向分布式、网络化。该文根据这一趋势对已有的测控系统进行扬弃,提出以高速以太网现场测控子系统,用企业局域网对测控网络进行管理,通过网关连接到Internet网实现远程测控功能的基于网络的分布式测控系统。在此基础上,分析了基于网络技术的分布式测控系统的软件体系结构,给出了各个部分的具体实现技术：在现场测控子系统中使用TCP／IP协议,将测控数据封包发向用作控制网络的高速Ethernet网;在用作企业信息网络的Ethernet上分别使用JSP技术和FjB技术,并结合SOL;Server数据库实现历史数据的操作;使用Java Applet技术结合Socket编程实现对实时数据的操作;在Internet上使用HTML语言旱现数据。     

基于环路特性的运动链拓扑图及特征描述的自动生成

基于运动链拓扑图环路的数组描述及环路数组之间的相互运算,给出通过基本环数组之间的相互运算构成组合环的算法及其条件,并给出运动链的唯一数字特征描述.然后,以 Windows 为平台,以VC 6.0为工具,利用面向对象的程序设计方法,开发了一套集运动链拓扑图绘图及唯一数字特征描述--特征邻接矩阵和特征描述代码自动生成的计算机程序.此程序的最大特点是不管运动链拓扑图的画法形式如何改变,项点标号方式如何改变,计算机都能自动生成其唯一数字描述,从而实现运动链拓扑图的唯一数字化,并为机械概念设计的自动化、智能化和网络化创造了条件.结果表明,提出的程序解决了机械概念设计过程中运动链拓扑图的唯一数字描述方式难以计算机自动实现问题.     

配网低压拓扑图自动成图技术探讨

针对目前配网低压拓扑图成图存在的问题进行探讨,提出了通过对低压开关进行拓扑编号自动生成拓扑的方法,把每台开关所处的连接关系用拓扑编号表示出来,利用开关台账建立其拓扑模型,通过编程展现各供电台区的低压拓扑图。本方法可有效解决配网低压拓扑图成图和模型维护困难的问题。     

基于机器视觉技术的接地线装拆安全检测告警技术应用

为了提高接地线工作的安全性，从接地线装拆安全检测告警出发，对基于机器视觉技术的接地线装拆安全检测告警技术进行研究，对安全检测告警软件进行了设计，利用手持终端与伺服电机实现接地线装拆安全检测的告警，通过MVC框架、以Java作为编程语言实现了软件的功能，并利用渐进式扩展网络（PSENet）技术对机器视觉技术中的文本识别方式进行优化。应用效果表明，基于机器视觉技术的接地线装拆安全检测告警技术的应用可有效减少误操作。     

基于X3D-Java虚拟航空展览馆参数化设计

基于第二代虚拟现实设计语言X3D和Java语言相结合的开发环境,进行虚拟现实场景的参数化设计研究.以虚拟航空展览馆为应用实例,对利用X3D作为3D场景载体、通过JavaScript实现Java Applet与X3D场景的间接交互、通过Servlet实现X3D场景文件的实时更新、通过JDBC接口与底层数据库进行数据交互等关键技术进行了具体的参数化设计研究,实现了对虚拟航空展览馆的参数化设计.     

基于X3D-Java虚拟航空展览馆参数化设计

基于第二代虚拟现实设计语言X3D和Java语言相结合的开发环境,进行虚拟现实场景的参数化设计研究。以虚拟航空展览馆为应用实例,对利用X3D作为3D场景载体、通过Java Script实现Java Applet与X3D场景的间接交互、通过Servlet实现X3D场景文件的实时更新、通过JD-BC接口与底层数据库进行数据交互等关键技术进行了具体的参数化设计研究,实现了对虚拟航空展览馆的参数化设计。     

基于Java的模块化远程监测分析系统设计与实现

针对某化工厂旋转机械机组的需求,设计基于B/S结构的系统拓扑结构,提出基于Java的模块化远程监测分析系统的解决方案,利用Java Applet远程客户端、MySQL数据库服务器、JDBC数据库连接等技术,完成了远程监测分析系统的开发。     

基于业务触发式的跨层拓扑控制算法研究

对于无线网络技术,在满足一定的服务质量要求前提下,如何实现能量优化是无线网络设计必须面对的问题。现有的拓扑控制算法主要集中在如何提高网络的性能,较少考虑如何优化能量消耗。基于跨层的思想,提出了一种业务触发式的拓扑控制算法(STC),通过在网络中建立恰好承载当前业务的拓扑结构,使得信息包可以沿着能耗优化的路径向目的节点发送。通过仿真研究表明,该算法生成的网络拓扑结构在实现QoS参数和能量优化方面具有明显的优势。     

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.