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1.
搭建了生物质电厂上料系统的CAN总线控制网络,并对其CAN总线智能节点进行了硬件和软件设计。该CAN总线智能节点采用SJA1000为总线控制器,配合微处理器AT89S52和CAN总线驱动器PCA82C250实现智能节点的控制功能及数字量输入、输出和串行通讯功能。在进行电路设计时充分考虑了电磁干扰对系统的影响,采用高速光耦作为中间连接,从硬件上加强了系统的抗干扰能力,增强了系统的可靠性和稳定性。  相似文献   

2.
概述CAN控制器SJA1000的特点、内部结构、SJA1000的基本特征以及SJA1000控制器的工作原理。介绍CAN网络系统节点的一般构成。并以独立CAN控制器SJA1000为例,结合CAN协议介绍了通用CAN总线节点的硬件电路和软件设计方法。  相似文献   

3.
根据舰载灯光系统中各个CAN网络的不同通信机理,为不同的CAN网络节点设置了不同的发送ID和接收ID,确保了各类信息在CAN节点间准确、高效地传输。  相似文献   

4.
基于CAN总线的传感器网络节点设计   总被引:1,自引:0,他引:1  
现场总线是用于现场仪表与控制室系统之间的一种开放、全数字化、双向通信与多站的通信系统.文中研究了CAN总线网络特性及总线构建,对CAN总线网络节点设定做了深入的研究工作,详细说明了构建CAN总线硬件及总线节点硬件配置,在通讯中设定了节点的ID及应用了优先级调度方法,使通讯更加流畅稳定.  相似文献   

5.
介绍了一种基于CAN总线电动车的制动系统的设计方法.系统中采用ARM7为中心控制器,采用P87C591为各个CAN检测节点的控制器,实时的采集车辆运行状态信号通过CAN总线送至各个控制节点,系统根据制动情况的不同,实现能量回馈制动、机械制动和ABS制动相结合的混合制动方式.重点对智能节点硬件进行了介绍.  相似文献   

6.
CAN总线工业测控网络系统的设计与实现   总被引:28,自引:3,他引:28  
于海生 《仪器仪表学报》2001,22(1):17-20,31
本文采用控制器局部网(CAN)和分散型计算机控制技术,成功地研制了CAN总线工业测控网络系统。该系统由多个主节点和多个从节点组成,且很好地实现了CAN总线工业控制网络的数据通信和现场测控功能。主节点监督和管理所有从节点,从节点测量和控制生产过程参数。  相似文献   

7.
彭义  高潮 《光学精密工程》2004,12(Z1):226-229
基于CAN总线技术,以PIC单片机和CAN总线控制器建立了长距离(约5km),多节点(约100个节点),混合多信道(含模拟信道和数字信道)的分布式传感系统.为增强适应性,各节点可以在线自由增加和移除.整个系统由中央计算机实时控制.系统具有指标超标报警、节点故障自动隔离及采集数据备份等功能.介绍了应用流控制、硬件握手和软件握手建立基于CAN总线的可靠、自适应传感系统的方法.  相似文献   

8.
针对煤矿传统瓦斯报警系统中数据通信存在的问题,提出了基于CAN总线的煤矿瓦斯报警系统的设计方案,阐述了瓦斯报警系统的整体构成,论述了采用CAN总线的智能监控节点的结构,着重介绍了系统节点的软硬件设计与实现方法.  相似文献   

9.
讨论了CAN现场总线技术的优越性,提出了基于CAN的远程程监控系统,并给出了其实现原理,分析了基于CAN智能节点,研究了CAN智能节电的硬件组成,并提出了远程监控系统的实际应用意义.  相似文献   

10.
CAN Bus是当前热门的一种现场总线技术,但其节点设计及通信调试却不易实现。本文结合日常在CAN系统、节点设计与应用中的实际工作,给出CAN智能节点的设计方法,同时归纳出1套实用的CAN Bus的调试流程,并探讨其相关机理。  相似文献   

11.
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...  相似文献   

12.
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.  相似文献   

13.
Giannuzzi LA  Utlaut M 《Ultramicroscopy》2011,111(11):1564-1573
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.  相似文献   

14.
The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...  相似文献   

15.
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....  相似文献   

16.
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...  相似文献   

17.
分布动态载荷识别的抗噪处理   总被引:2,自引:2,他引:0  
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.  相似文献   

18.
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。  相似文献   

19.
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.  相似文献   

20.
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.  相似文献   

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