基于ARM机房空调嵌入式监控系统设计

为了能够准确监测和控制机房的温湿度,以保证通信机房内计算机的高效运行。设计了ARM架构的机房空调监控系统。利用三星的Exynos4412处理器,采用自适应模糊控制压缩机的转速和对加湿器控制,能够实现对机房温湿度控制,同时,利用以太网实现远程监控,利用Wi-Fi以及无线广域网技术实现无线监控。采用基于Linux的安卓系统,建立良好用户界面,优化人机交互环境。系统的实现能够提供可靠的机房温湿度控制。     

机房温湿度分析PCA方法研究

机房的设备和机房环境有着非常密切的关系,特别是温湿度环境。如控制不当,容易造成机房温度过低、湿度过高、耗能过大,甚至影响设备的运行及使用寿命等。现利用主成分分析(PCA)方法建立温湿度变化模型,分析研究机房温湿度变化趋势。     

通信机房自动温湿度控制系统

设计一种基于AT89C52单片机的自动温湿度控制系统,包括温湿度传感器件、键盘与中文液晶模块和功率输出控制模块。该系统采用友好的人机接口实现灵活的机房温湿度的自动控制,具有良好的可靠性和实用性,推广价值极大。     

棉纺厂空调监控系统改造

应企业要求,根据某棉纺厂空调系统的现状和对温湿度控制的工艺要求,对该厂空调系统进行了自动化改造。监控系统由触摸屏、PLC、变频器、温湿度传感器等组成。采用PLC模拟量输入模块,采集现场温湿度值,PLC根据设置的温湿度值,对温湿度控制分别采用不同的闭环控制方法,实现了棉纺厂温湿度的自动控制。解决了长期困扰企业的温湿度差异较大引起的产品质量问题和能耗偏高、操作员劳动强度大的问题。     

基于物联网的电力通信机房状态监控系统设计

针对电力通信机房运行过程中依靠人工定期巡检完成运维,存在人工劳动强度大、效率低故障处理不及时、容易发生电网供电事故等问题,结合物联网技术和图像识别技术,设计了一种智能电力通信机房状态监控系统。该监控系统可以对机房内机柜仪表数据和环境数据进行实时监测,采用LoRa技术将数据传输至网关,通过NB-IOT模块将数据信息上传至物联网云平台,完成数据的整合和存储,并且在PC端显示实时状态。通过测试,该监测系统能够实时显示各设备、机房内温湿度、气体溶度等数据信息,降低运维人员工作量,提升效率,具有一定的借鉴意义。     

基于无线通信的农业温室温湿度测控系统

针对农业温室的温湿度采集与控制,提出一种基于无线通信的农业温室温湿度测控系统,并介绍了系统结构和软硬件设计.该温湿度测控系统包括无线温湿度采集及控制器及无线控制信号接收单元,采用了主控芯片MSP430 F2274、温湿度传感器SHT10和2.4G无线射频芯片EM198810.该系统能实时对温湿度进行监控及报警,并可以根...     

车间恒温低湿空调系统方案设计

设计了一个恒温低湿空调系统,其主要作用在于生产车间的大空间温湿度控制。空调新风系统与工艺排风系统进行匹配,保证房间的正负压差,并保证房间的温湿度在要求的范围内。自控系统对整个空调系统的设备进行控制,将房间的温湿度控制在要求的范围内。     

温湿度独立控制空调系统中冷水设计温差的选取探讨

温湿度独立控制技术是降低大型公共建筑能耗的一种有效的方法。本文从实验的角度,分析了温湿度独立控制的空调系统在不同的设计温差条件下系统能耗的变化规律,以期能为温湿度独立控制空调系统的设计提供参考。     

基于灰色预测模型的中央空调温湿度系统控制策略

针对中央空调温湿度系统混杂特性,采用切换控制思想对温湿度系统进行建模和预测控制,将温湿度预测控制问题描述为混合整数二次规划问题;采用灰色预测方法对系统中可测不可控的扰动输入进行预测。分析了温湿度切换系统有限时间内的稳定特性并结合温湿度幅值约束条件,得到各类设备的最优切换序列。最后进行了仿真研究和统计学分析,结果表明该建模方法和控制策略有效。     

基于S7-1200 PLC的粮仓温湿度远程监控系统设计

合适的温湿度是粮食长期存储的必要条件,针对粮仓温湿度监控自动化程度不高的现状,该文设计了一种基于S7-1200PLC与组态王的温湿度监控系统。下位机采用以太网通信的S7-1200PLC,完成粮仓温度的采集处理与现场控制,上位机采用组态王6.55实现无人操作功能。自动运行模式下,温湿度出现异常时,温湿度调节装置在PLC的控制下自动运行,解除温湿度报警。经反复测试,该系统可以有效的监视和控制粮仓的温湿度,具有较好的实用价值。     

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.