基于SAE J1939协议的动力传动系统虚拟仪表及数据采集系统

本文针对具有SAEJ1939CAN总线接口的动力传动系统,开发了基于CAN总线的动力传动系统虚拟仪表及数据采集系统,该系统采用周立功公司开发的CAN转USB卡作为动力传动系统和PC机的硬件接口,采用NI公司的LabVIEW软件平台开发显示界面程序及CAN总线通信程序。该系统除可实现虚拟仪表及数据采集以外,还可实现基于总线的发动机油门控制、发动机调速功能切换等功能,为动力传动一体化系统的研发带来了便利。     

基于CAN总线技术的车门控制系统

针对传统汽车信息显示系统显示精度不高、显示信息量少、扩展性能差的问题,对现场总线CAN—Bus协议和SAEJ1939协议进行了细致的分析和研究,探讨了CAN总线协议规范的物理层定义和数据链路层信息帧格式。研究了J1939协议的网络体系结构及其通信协议的具体实现,并把它们应用于车辆综合信息显示系统的仿真设计过程中;在虚拟设计过程中,使用总线仿真软件CA-Noe建立了四节点的车辆综合信息显示系统,定义了网络节点,创建了车辆信息报文数据库,编辑了虚拟面板,编制了CAPL程序,模拟了部分车辆功能,以软件仿真的形式虚拟设计了车辆综合信息显示系统。研究结果表明,基于J1939协议的车辆综合信息显示系统可模拟车辆运行过程中各部件的工作状态信息以及道路环境信息,并通过总线发送到信息显示系统上,使驾驶员可以更有效地控制汽车正常运行。     

HMI触摸屏在混合动力客车上的监控应用

HMI(Human Machine Interface)触摸屏由于可支持CAN总线SAE J1939协议驱动,目前已越来越多的应用到汽车总线上。文中主要介绍了HMI触摸屏在混合动力客车监控界面设计应用,通过将HMI触摸屏接入整车CAN网络采集混合动力系统信息,通过HMI界面直观的显示出来,可作为混合动力客车系统调试及售后故障诊断维修工具;此外,通过HMI实现了发动机累积油耗数据的采集,从而计算出百公里油耗,帮助系统开发者掌握混合动力客车油耗变化趋势以便于进一步优化混合动力控制策略、降低油耗。     

基于ARM和CAN总线的汽车仪表设计

讨论了汽车仪表研发的系统设计思想与实现过程,提出了在嵌入式WINCE平台上用液晶显示屏显示车载信息的方法.该系统通过CAN总线接口提取车速、里程、发动机转速、燃油量、冷却水温度等各种数字量和模拟量,经ARM微处理器分析计算,通过TFT液晶屏显示出来.     

使用CAN总线分析仪排查电控发动机故障案例

正内燃叉车的电控发动机通常采用CAN总线与其电气设备连接,CAN总线技术既可以提升各电控单元之间的通信速度,又可以使线路简化,便于线路布排,但是电控发动机及CAN总线出现故障后难以判断。本文介绍使用CAN总线分析仪快速排查电控发动机故障案例。1故障现象某叉车电控发动机通过CAN总线与该叉车ECU控制器连接。当叉车上电后,液晶屏仪表     

基于SAE-J1939协议的CAN总线仪表盘设计

首先对SAE-J1939通信协议的特点和ECU电喷发动机的特点进行了阐述,随后分析了基于SAE-J1939通信协议的CAN总线仪表盘的设计思路、电路结构和关键元件,最后对仪表盘的软件编写流程进行了介绍,对今后电喷式发动机CAN总线仪表盘的研发具有借鉴意义。     

采用GPRS技术的CAN总线塔机安全监控系统

介绍一种基于GPRS技术的CAN总线塔机安全监控系统的设计与实现。系统由数据采集模块、CAN总线收发模块、人机交互界面以及GPRS模块组成。系统以STC89C516单片机为主控制器,实现了塔机运行时工作状态的监控、显示、记录和报警,并实时将数据通过GPRS模块上传到网络,以及将报警信号发送到手机终端,在监控中心实现远程多机联合监控。实践证明:系统具有良好的实时性、可靠性以及广泛的应用价值。     

基于DSP+μCOSⅡ的装甲车辆数字灭火

阐述基于DSP和μCOS-Ⅱ的装甲车辆数字灭火控制系统设计,给出了系统的总体结构、关键电路设计和软件实现.该系统采用TMS320LF2407作为核心控制器,内嵌实时操作系统μCOS-Ⅱ,具有实时性和高可靠性等特点.系统设计应用BIT(Built-in-Test)和CAN总线技术,除实现良好的灭火功能外,还具有系统状态的实时监测和故障在线诊断能力.     

基于CAN总线的辅助发电系统研究

设计了一种发电及其运行状态实时监测系统,将CAN总线技术引入到该整套系统中。该系统包括以发动机带动发电机的发电系统和以LabVIEW平台为基础的监测系统,通过CAN总线将各个系统联结成一个有机整体。通过实验证实,基于CAN总线技术的发电及其运行状态实时监测系统,不仅有助于实时地采集发电运行的数据,也可以有效确保在实际中发电系统的稳定运行。     

基于CAN总线的电除尘器远程监控系统的设计

介绍了采用CAN总线构成的电除尘器远程监控系统.该系统可以实现基本的数据采集及控制功能,实时地采集除尘器的工作状况,并调整除尘器的运行参数,可以使电除尘器工作在最佳状态.提高了信息集成程度,使生产管理得到了优化.具有结构简单、可靠性高、通信速度快等特点,有广泛的应用前景.     

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.