远程调节计量泵的研制

计量泵是一种可按工艺流程的要求,实现流量调节、精确计量和连续给料的特殊通用机械产品,广泛应用于石油化工和金属冶炼等领域。为满足远程调节流量的要求,设计开发了一种新型远程调节计量泵。该产品采用电机替代传统手轮调节行程长度,并借助通过PLC和反馈机构进行闭环控制,具备远程精确调节的功能。     

基于LPC2292的Ethernet—CAN转换器的设计与实现

为了解决以太网和CAN总线之间的互联问题,将煤矿井下现场总线控制系统改造为以太网络分布式控制系统,研发了基于LPC2292微处理器和R．TL8019AS以太网控制器的Ethemet—CAN转换器。LPC2292采用嵌入式TCP／IP协议栈通过RTL8019AS与以太网中的设备进行通信,利用LPC2292集成的CAN控制器与CAN总线上的终端进行通信。在通信过程中,LPC2292进行TCP／IP协议和CAN协议之间的转换。经验证,该转换器很好地完成了两种网络之间的协议转换和数据通信。     

基于LPC2292的Ethemet-CAN转换器的设计与实现

为了解决以太网和CAN总线之间的互联问题,将煤矿井下现场总线控制系统改造为以太网络分布式控制系统,研发了基于LPC2292微处理器和RTL8019AS以太网控制器的Ethernet-CAN转换器.LPC2292采用嵌入式TCP/IP协议栈通过RTL8019AS与以太网中的设备进行通信,利用LPC2292集成的CAN控制器与CAN总线上的终端进行通信.在通信过程中,LPC2292进行TCP/IP协议和CAN协议之间的转换.经验证,该转换器很好地完成了两种网络之间的协议转换和数据通信.     

隔膜计量泵

随着化学工业的迅速发展,在化工流程中采用各种计量设备日益增加,因此,对于各种计量泵的需要量也愈来愈大,对其计量精度和自动化程度的要求也愈来愈高。为了满足这些要求,专门设计、制造了各种单缸计量泵和数个缸头组合一起的组合式计量泵以及各种隔膜计量泵。计量泵是一种流量可以根据流程需要,能够任意调节的容积式泵。流量的调节可以是手     

Ethernet-CAN总线协议转换器在计量泵远程控制中的应用

为实现对工业现场计量泵的远程控制,设计了一种基于ARM7微控制器LPC2368的以太网和CAN总线协议转换器。介绍了协议转换器各组成部分的硬件电路图及软件流程图。以有限状态机思想实现以太网部分TCP协议,以Modbus协议作为CAN总线应用层协议控制计量泵,给出了一种以太网-CAN总线协议互联的方法。系统结构简单,成本低廉,初步运行结果表明:以太网-CAN总线协议互联方法运行可靠、稳定,具有较好的实用价值。     

基于CAN总线的双CPU结构电动机综合保护器

CAN是一种有效支持分布式控制和实时控制的串行通信网络.基于CAN总线的双CPU电动机保护器适应当前继电保护装置保护、测量、控制与通信功能一体化的需要.实际运行证明,基于CAN总线的电动机保护器通信速率高、准确、可靠性高、保护功能强.     

基于以太网的分布式数控系统实时通信网络研究

为了实现分布式数控系统高兼容性和强实时性的通信特征,提出了一种基于以太网的分布式数控系统实时通信网络分层体系结构.该结构满足分布式数控系统向上信息无缝融合,向下满足控制网络的实时通信.在保持以太网结构的前提下,提出了实现各层实时通信的方案,特别是实现运动控制层的精确时间同步及通信的强实时性.由此,设计了硬实时通信控制器,保证分层体系结构实现基于通用以太网的实时通信网络.     

基于单片机的计量泵流量控制器

针对国内计量泵普遍存在流量显示不直观,计量不精确,流量大多手动现场调节,产品难以满足现代工业生产工艺水平与技术要求等现状,开发设计了一种能直接显示计量泵流量值,可现场设定、控制流量和总量大小的计量泵流量控制器。为今后利用先进测控技术改造传统计量泵做了有益探索。     

计量泵群远程监控方案及其数据服务器设计

计量泵被广泛应用于各种流体工业中,国内外对此的研究多集中于工艺结构改良和机电一体化系统设计,而鲜有多泵、泵群远程监控和协调调度方面的研究。针对实际工业中计量泵通常需要协同工作的现状,分析和改进了计量泵网络化监控方案,使之满足对大规模计量泵群的远程监控需求;设计了一套基于Java的专用数据服务器软件,实现了监控系统的数据交换和数据维护;针对数据量大引起的系统性能下降问题,结合环形缓存机制提出了一种环形对象池技术的设计和实现方案;最后模拟不同的网络负载条件测试了数据延时时间。研究结果表明,服务器能够保证数据的实时性,能够应用于大规模计量泵群的远程监控中。     

基于CAN总线的指挥车辆控制系统设计

指挥车辆上装设备增多,控制越来越复杂,为了对指挥车辆上装设备进行集中统一的管理和控制,设计了一种基于CAN总线的综合控制系统。对控制系统进行软硬件设计,软件采用B/S架构,硬件中控制主机采用瑞芯微RK3399芯片,具有CAN通信接口,通过CAN收发模块将指挥车辆中的设备采用分布式结构挂接在CAN总线上,根据车辆上装设备通信要求,进行总线通信速率设计、通信协议设计,从而对设备的重要参数进行实时采集、处理、传输和存储,通过设计的控制系统最终能够实现智能化控制,并且能将处理后的数据发送给上位机。实际应用表明,基于CAN总线的指挥车辆控制系统具有较强的灵活性和易操作性。     

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...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.     

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...