基于FlexRay网络的飞行控制计算机总线通信系统

现代无人机对飞行控制计算机的性能与安全性要求越来越高,使得基于CAN总线技术的一类飞行控制计算机内部总线负载情况越来越严重,因此有必要研究一种高数据传输率和高安全性的总线FlexRay代替CAN。基于CAN总线的分布式飞行控制计算机的网络结构和内部通信机制,设计了基于FlexRay网络的飞行控制计算机总线通信系统,并进行了通信测试验证,结果验证了FlexRay相对CAN在实时性、通信速率和效率上的优越性,为日后在新型飞行控制计算机上用FlexRay总线替代CAN总线打下了坚实的理论基础。     

CAN总线在电气控制系统中的应用

CAN总线具有可靠性、实时性和灵活性的特点,在自动化领域得到了很好的应用。基于CAN总线的发展由来,从实际应用着手阐述了CAN总线的各种特征,最后通过分析汽车车身电气控制系统,进一步阐明了CAN总线的特点和应用优势。     

工程机械轮边电力驱动线控制动技术研究

利用MATLAB/Simulink仿真模块,分别对工程机械轮边电力驱动在制动工况下CAN(Controller AreaNetwork)、FlexRay总线对制动性能的影响进行了分析.仿真结果表明,在考虑总线传输延时的情况下,总线控制制动具有较好的制动效能,同时可以看出FlexRay总线相比CAN总线具有更加稳定的制动控制性能.     

基于FlexRay总线的线控转向系统通信网络

给出了一种汽车线控转向系统通信网络设计.首先对线控转向系统总体方案进行设计,重点介绍了线控转向系统对通信网络的要求;之后设计了基于FlexRay总线的线控转向系统通信网络,包括FlexRay通信网络设计、各节点通信任务分配以及节点初始化;最后进行了通信实验,结果表明所设计的通信网络安全可靠性好,满足汽车线控转向系统通信要求.     

基于CAN/LIN车身总线的设计

文章介绍了汽车总线的现状和发展趋势,以及CAN／LIN车身总线局域互联网络的技术特征,并设计了基于CAN／LIN总线的车身控制系统,从而简化了汽车线束,降低了汽车生产成本。     

一种FlexRay总线数据通信的实现

传统的CAN、LIN等车载总线不能满足对可靠性和速度要求较高的控制系统。为了能实现高速可靠的FlexRay总线通信。文章提出了一种FlexRay总线数据通信的实现方案,并且根据该方案设计了一个具体FlexFay车栽总线网络,将其应用于线控刹车和线控转向系统中。实验结果显示无论在高速性还是在可靠性方面该方案都表现出很好的性能,可以预见文中提出的FlexRay总线数据通信的方案还可以应用于其他类似于线控悬挂等的线控系统中。     

信息安全背景下智能汽车CAN总线异常检测技术研究

智能汽车CAN总线异常检测技术能够为智能汽车的安全性提供有力的保障。然而CAN总线老化损坏,使得车机系统出现问题。本研究创新了一种汽车CAN总线检测装置来解决汽车CAN总线的检测问题,能够检测汽车CAN总线的故障,以及检测汽车CAN总线的运行状态。采用实验室实验的方法,对汽车CAN总线检测装置进行了系统的测试。汽车CAN总线检测装置具有较高的精度和可靠性,能够有效检测汽车CAN总线的运行状态,并且具有较高的安全性和可靠性,可以满足汽车CAN总线检测的要求。     

分析CAN总线在起重机控制中应用

本文分析了CAN的优点,并结合起重机的工作特点,设计了CAN总线技术在起重机中的应用方案,提高了起重机控制的可靠性,简化了现场的施工,阐述了基于CAN总线的大型起重机控制系统所具有的重大意义。该系统具有友好的人机界面、保护功能完善、可靠性高等特点。     

基于CAN总线的直燃式液氮泵车控制系统

介绍了直燃式液氮泵车的组成和工作原理,设计一种基于CAN总线的液氮泵车控制系统。描述了控制系统与发动机ECU的CAN总线通讯的配置,并重点介绍控制系统中温控器的组成、蒸发器的温度控制原理。     

基于CAN总线的汽车车身控制系统的设计

简要介绍了CAN总线的特性,对汽车车身控制系统进行了描述.针对汽车车身控制系统,重点阐述了CAN节点硬件电路设计和系统软件设计,最后指出CAN总线必将会在汽车控制系统中得到更加广泛的应用.     

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.