多轴电火花加工(EDM)数控系统的设计

本文呈现了一个面向电火花加工的多轴数控系统的设计与实现。基于OSEC（open system environment for controller）标准的数控系统开放式结构设计思想，在分析电火花加工工艺和控制功能的基础上，构建了电火花数控系统的分层体系结构，根据任务的功能特性把控制系统划分成功能模块，通过功能模块配置和系统配置，实现不同加工对象的应用软件。同时介绍了电火花专用四轴运动控制器的设计，该控制器采用单片微处理器和专用运动控制芯片组成的双CPU结构，利用PCI总线接口芯片和共享内存实现与上下位机之间的高速通信。该控制系统经实际运行证明，性能稳定可靠，满足电火花数控加工的功能要求。     

基于PMAC卡的多轴控制系统设计

介绍了一种基于PMAC多轴运动控制卡的全闭环多轴运动控制系统的设计,主要论述了控制系统的功能、结构组成、主要模块的设计等内容。     

自动封装系统运动控制的设计与实现

针对现代化的工业加工和自动化生产线上广泛采用的三轴运动控制系统的控制要求及特点,介绍了ACR1505多功能运动控制卡的组成、特点及其应用,它采用PC＋运动控制器＋伺服电机组成的控制系统.其中基于DSP和CPLD的运动控制器充分发挥了DSP快速数据运算能力和CPLD的硬件管理功能.文中还详细讨论了控制系统硬件平台和软件系统的设计与实现方法.     

基于运动控制卡的等厚加工设备控制系统的研制

介绍了一种基于运动控制卡的等厚加工设备控制系统,对原有的数控设备进行了改造。控制系统核心为工控机和运动控制卡,利用东方嘉宏9030运动控制卡产生脉冲信号对机械部件进行实时控制。在VC++6.0下开发了控制界面,实现了单轴运动和多轴直线、圆弧插补的功能并进行了误差分析。在实验室模拟设备上应用证明其运行轨迹平顺,加工表面平滑,误差小,且上位机界面具有良好的开放性和可移植性。     

锌空燃料电池极片生产线多轴控制系统的研究

介绍了以三台伺服电机为执行元件的干嵌法锌空燃料电池生产线运动控制系统。系统采用PC和运动控制卡作为上位控制多个伺服电机的运动,搭建了多轴控制系统的硬件平台。根据工艺要求进行了硬件的选型,确定伺服电机的控制方式和参数设置,建立伺服驱动器和控制卡之间的连接。Visual C++编写基于PID控制的普通运动控制卡的动态链接库,使运动控制系统能够实现精确的同步运动;以LabVIEW为开发平台,设计基于虚拟仪器的控制系统,通过调用VC编写的动态链接库实现多轴同步控制功能及实时状态监测。     

基于PC/104的嵌入式四轴运动控制卡硬件设计

针对基于PC/104的嵌入式四轴运动控制卡,结合DSP专业工控芯片设计电路原理图和PCB。该设计采用PC/104嵌入式系统总线,以MCX314As芯片进行运动控制,适用于工业领域的四轴运动控制。使用Altium Designer软件进行电路原理图绘制和PCB设计,该卡设计旨在实现电火花线切割机床的运动控制。结合嵌入式CAD编程系统,搭建了嵌入式电火花线切割数控加工系统。     

基于Windows平台智能模糊控制电火花数控系统

利用Ｗ ｉｎｄｏｗ ｓ 消息驱动机制和时钟中断,成功地解决了数控电火花加工中多任务和实时任务处理的问题。介绍了该数控系统的功能组成和主画面的构成,并针对系统主要模块,即电火花加工智能自选规准、电火花加工过程模糊控制系统、多轴联动控制等进行分析和介绍,最后介绍了系统的应用情况。     

基于运动控制卡的多轴联动控制系统设计

基于PC机和运动控制卡的主从式控制结构,开发了一种面向多任务请求的多轴联动控制系统。详细介绍了系统硬件架构。借助VS集成开发环境,开发Windows环境下的多轴联动控制系统,并实现了多轴联动的任意轨迹插补运动,验证了该系统的可靠性和稳定性。     

基于运动控制卡的多工位数控冲床控制系统的研究与应用

提出了一种基于工控机和运动控制卡的多工位数控冲压机床控制系统的设计方案。工控机作为上位机负责控制系统的非实时任务管理,而运动控制卡则用来负责完成运动控制中的实时任务。利用VC＋＋6．0为开发工具,开发出多工位冲床的数控系统,不仅能满足零件加工的高精度要求,还实现了产品的数控自动编程功能。     

六轴联动电火花加工数控系统的研究

为了解决六轴联动电火花加工数控系统软硬件的设计难题，以可编程多轴控制器为运动控制器，提出了基于开放式体系结构进行六轴联动电火花加工数控系统的硬件体系结构。为了提高软件系统中与加工过程密切相关的实时任务的实时性能，基于实时Linux操作系统，实现了数控系统软件中的运动控制任务和放电状态检测任务等实时性要求较强的任务。此外，还进行了Linux平台上可编程多轴控制器的设备驱动程序、数控代码解释模块、图形用户界面和工艺数据库的设计。该系统能很好地解决六轴联动电火花机床运动控制精度要求较高、需要控制的轴数较多等设计难点。     

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...