起重机械远程监控APP实时监测模块设计

为了使远程起重机械设备状态监测功能更具便携性,设计并实现了一种面向Android移动终端的实时数据监测模块。对异步输入/输出技术进行了研究,设计出客户端与服务器的通信方案。为了减少资源消耗和提高并发处理能力,服务器使用Netty框架作为高性能通信基础、利用线程池与任务分发机制实现了业务处理逻辑、通过Mybatis框架实现数据库的访问,并使用Spring容器实现程序中各种对象依赖关系与生命周期管理。测试结果表明,该模块能在移动客户端上实时显示监测数据和设备运行状态,且服务器具有较高的并发连接能力。模块有较高的可重用性,并能有效地扩展现有监控系统的功能。     

移动式服务机器人混合控制器关键技术研究

针对移动式服务机器人控制系统需要具备运动控制、网络通信、多媒体UI交互及设备远程监控等多种功能而导致成本高昂、实时性差等问题,提出了多核异构微控制器与Android移动设备相结合的混合控制器方案并实现了原型系统。该系统采用面向管理的多微控制器运动控制系统与信号采集系统,通过OTG与Android移动设备连接,可使得Android移动设备完成多媒体UI交互、WiFi及WiFi Direct通信、图像传输以及设备状态监控数据传输与处理;服务器端实现了设备状态数据的存储与应用。经过测试,样机整体性能良好,达到了预期的设计目标。     

基于Android平台智能家居客户端的设计与实现

针对智能家居系统中功能实现的便捷性问题,对智能家居系统控制实现的通信模块、数据库和消息通信格式等方面进行了分析与实现,从而设计了智能家居系统客户端。首先基于Android平台采用MVC设计模式将客户端的设计分为View视图、Activity控制层和逻辑功能部分;其次自定义客户端与嵌入式网关之间的数据消息格式,从而采用格式化的消息交互格式提高了系统的可扩展性和网络传输的可靠性;设计并实现了客户端的数据库,以便保存用户设置数据及传感器历史数据;对客户端与网关交互的Socket通信和HTTP协议通信进行了设计与实现。最后结合网关和无线传感网络节点对客户端功能进行了测试。研究结果表明,该客户端能够方便、快捷地实现各功能,符合预期要求。     

基于Android的电动汽车充电桩监控系统设计

随着电动汽车的普及,电动汽车充电桩数量不断增加,因此,电动汽车充电桩监控系统的开发具有重要意义。基于Android系统,设计了一套电动汽车充电桩设备的移动监控系统。该系统由服务端和移动端APP和通信模块组成,服务端基于JSP平台开发,对数据进行存储并进行数据处理。移动端APP基于Android设计,为系统的用户使用界面,实现了充电桩提供移动监控与故障处理功能。通信模块基于Http协议设计,为移动端和服务端提供了数据交互的媒介。该系统实现了对充电桩的移动监控功能,提高了充电桩维护的工作效率。     

基于Redis与SSM的大型设备数据运用系统设计

针对目前大型设备进行数据采集,远程监控,数据处理的趋势,结合以Web技术为主的B/S架构的广泛应用,提出一种以SSM(Spring MVC+Spring+Mybatis)框架为B/S架构实现基础的大型设备数据运用系统。系统采用分层结构,包括了数据层,应用层和表示层,数据层采用Redis和MySQL进行实时数据与非实时数据的持久化,使系统具有高效缓存数据的能力,应用层和表示层则依据SSM框架进行分模块方式设计,降低系统耦合度,简化开发流程。     

基于消息队列遥测传输协议的切削数据主动推送系统设计

针对当前切削数据库无法主动推送数据的局限性,利用移动设备随时随地可用的优势,以MQTT(Message Queuing Telemetry Transport,消息队列遥测传输协议)协议为基础,设计和开发了一种面向Android移动终端的切削数据主动推送系统,研究了系统架构、消息推送等领域的关键技术。测试结果表明:该系统在用户参与切削加工任务时,能够完成相关切削数据、设备信息、加工结果信息等的推送,同时实现了用户注册登录、身份验证、任务查询、自动订阅、切削数据主动推送、数据库查询修改等功能。     

铝板带冷轧远程监测系统的研究与设计

开发了基于Android的铝板带冷轧远程监测系统。整体采用C/S架构模式,用LabVIEW软件开发了服务器端程序,并通过用于过程控制的对象连接与嵌入(Object Linking and Embedding for Process Control,OPC)技术从工业现场获取数据。客户端采用模块化及面向对象的思想在Basic4Android+Java JDK+Android SDK开发环境中开发,具备用户认证、网络通信和随时随地数据实时获取并人性化显示的功能,测试运行稳定,实现了对铝板带冷轧生产的远程移动监控,达到了设计要求。     

基于OPC UA的828D数控机床群远程监控系统设计

针对机械加工企业中底层加工设备与企业管理系统脱节的情况,基于OPC UA技术,设计开发了数控机床群远程监控系统,利用OPC UA技术实现了底层设备与监控系统的数据交换,应用C#完成了上位监控界面的开发,通过数据库的事务发布配置实现了各个客户端与服务器的数据同步。同时,上位监控系统还实现了报警、数据统计等功能。运行测试显示,该系统运行稳定可靠。     

FANUC数控机床远程监控DNC系统开发和研究

针对具有以太网功能的Fanuc数控机床和数字化检测设备,利用SQL Server数据库和.Net平台,开发一套基于Socket通信和多线程技术的数控机床和设备远程监控DNC(distributed numerical control)系统。系统可以对多台数控机床和具有通讯功能的质量检测设备同时进行数据的实时采集,并实现机床和设备的状态信息监控、数据集成管理、效能分析、远程故障诊断、车间生产管理和产品质量管控等功能,保障数据的完备性,实现了制造基础数据的集成。介绍了Fanuc数控机床远程监控DNC系统的系统架构设计,针对每一个功能模块的设计和实现方法进行了论述,并对系统程序的工作流程、数据的解析方法和报警监控机制进行了介绍。通过在制造工厂的实际应用,验证了系统的可靠性。     

机床管家远程监控与管理系统的设计与实现

根据机床设备运行状态的监控管理需求,基于C/S架构和Internet设计了包括服务器、客户端与机床端软件,构成整套远程监控与管理系统。分别基于Windows系统和Android系统开发了两套客户端,实现了机床实时监控、远程机床管理、机床数据文件交互、权限管理、实时警报等功能,满足了数控机床远程监控与管理的需求。     

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.     

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.     

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....     

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.