纯软件开放式数控系统ServoWorks CNC及其应用

开放式数控系统是当今数控技术领域的研究重点。本文介绍了一种纯软件开放式数控系统一ServoWorks CNC，并且基于应用实例分析了纯软件开放式数控系统的特点。     

全软件数控系统

美国SoftServo公司的全软件数控系统ServoWorks,可以运行在Windows和Linux两种操作系统平台上,可支持实时光纤和IEEE1394火线两种数字伺服网络,适合在中国推广应用。     

基于纯软件开放式数控系统的FUJI龙门磨床数控化改造

针对龙门磨床加工精度低的问题,采用ServoWorks CNC纯软件开放式数控技术,对基于PLC的原控制系统进行改造,利用开放式数控系统的灵活性和通用性特点,使磨床操作简便,运行可靠,维修方便,提高了磨床的加工精度.     

全软件数控系统

机械工业中,数控机床得到了广泛的应用,而与其相适应的软件也得到了发展,全软件数控系统ServoWorks,可以运行在Windows和Linux两种操作系统平台上,可支持实时光纤和IEEE1394火线良种数字伺服网络。适合在中国推广应用。     

利用CNC与PLC公共存储器设计数控分度台的方法

针对格里森609准双曲面齿轮精切机的数控改造,介绍了利用西门子802D数控系统CNC与PLC公共存储器设计其工件箱数控分度台的方法。     

基于DXF文件的石材桥切机自动编程方法

应用开放式的纯软件ServoWorksCNC技术,通过对DXF图形文件信息的提取与处理,结合石材加工工艺,提出并实现了一种基于DXF文件的石材桥切机二维自定义图形的自动编程方法。该方法经济、可行,且提高了石材加工的编程效率。     

一种橡胶管环切机的设计

橡胶管环切机是橡胶管工业中常见的设备,在结合国内现有技术基础上,通过三维建模设计出一种快速切割橡胶管环切机.该橡胶管环切机的主要特征是通过传动系统使刀架进行旋转,从而带动刀具对橡胶管进行刀旋式环绕切割.介绍了装置结构,验证了此设计的可行性方案,通过此次对橡胶管环切机的试验,达到了操作过程简化的目标,提高了切割机的加工效率.     

新一代数控系统

德国Andron公司的最新产品是新一代基于微机的、在Windows平台上的开放式数控系统。它采用由两个Intel处理器,通过PCI-PCI桥进行相互通信。一个处理器承担数控运算(NC计算机),另一个作为人机界面计算机。NC计算机中插有NC CPU卡、NC机床卡。NC机床卡与数控驱动装置连接,并通过2块带PCI桥的总线卡与人机界面计算机通信。人机界面计算机的内部总线卡与数控系统操作面板和外部接口连接。人机界面计算机的CPU卡控制触摸式LCD显示屏以及计算机外设和网络通信。传统的数控系统是将编程系统的数字信号转换成为电压模拟信号,再以电压的…     

基于PLC的石材大切机的自动化改造

分析石材大切机的组成原理和控制要求,拟定了大切机自动化改造的整体方案,选用西门子S7-200作为主控制器对大切机进行了改造,并给出了部分PLC程序,经工厂实践证明,具有明显的经济价值。     

石英管环切机设计与实验研究

针对人工切割石英管效率低,且容易破碎断裂的问题,基于环形切割均匀方法,设计出一种石英管环切机。该机通过高速旋转的环切砂轮,绕石英管外圆旋转进行切割,由伺服进给机构调节环形切割砂轮的进给量。从而实现石英管均匀环切,避免石英管切割时破碎断裂。本文开展了石英管环切机的设计要求分析和切割效率计算,确定了环切机设计方案,研制出环切机。环切机切割外径Φ40mm和壁厚3.0mm石英管时,环切进给量小且均匀可调,单个切口需要切割时间约为3.5min,满足设计要求。     

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...     

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.     

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。     

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...     

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。     

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。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

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.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

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...