开放式数字运动控制结构及SERCOS接口技术

开放式数控系统是当前数控技术研究的热点,本文在对比传统控制结构与SERCOS接口控制结构的基础上,阐述了SERCOS接口对控制结构带来的重大变化及对开放式体系结构的重要作用;主要介绍了SERCOS接口的一般工作原理、SERCOS协议,SERCOS接口的特性和能力;提出了基于SoftSERCANS的PC型运动控制器的体系结构,此体系结构具有高开放性、高性能的特点,同时可以大大简化运动控制应用软件的开发。     

基于SERCOS技术实现高速高精度运动控制

在介绍SERCOS技术优势的基础上，阐述了利用SoftSERCANS通信卡开发出数控系统的底层应用软件，实现了实时数据交换，并分析了利用SERCOS技术实现高速、高精度运动控制的硬件和软件结构。     

开放式数控系统与标准化

为了适应全球化竞争引发的市场的迅速变化,快速构建并重构制造系统,开放式数控系统应运而生。开放式数控系统必须遵循一系列的国际标准或行业事实标准,没有全面的国际标准就不可能有真正的开放式数控系统。概括了开放式数控系统的结构及其接口。外部接口主要是数控系统与企业管理网的接口、与伺服系统的接口、与I/O设备的接口,以及与数控加工程序的接口;内部接口主要是系统的组件之间交换信息的接口,即应用程序接口。阐述了对应于上述各类接口的标准和协议的具体内容,比较了SERCOS,MACRO和FireWare三种标准的主要特性,分析了接口标准的应用现状及发展趋势。研究结果表明,数字式接口将很快取代模拟接口,而SERCOS协议将成为数字伺服接口的发展方向。     

基于实时Linux的SERCOS接口-LIN-SERCANS及应用

实时Linux作为廉价并且可靠性高的实时操作系统,在通讯与数字控制领域越来越得到广泛的应用。SERCOS接口是新一代的数字驱动器运动控制总线接口。介绍了SERCOS总线接口的基本概念。阐述基于实时Linux的SERCOS接口—LINSERCANS的基本结构、使用方法、与SERCOS接口的关系及其在生产中、高档数控系统中的优势,并以数控横切机为例说明LINSERCANS的应用。     

基于Windows平台的开放式数控系统研究

论述了基于PC的开放式数控系统研究的必要性,在PC环境下利用数字伺服现场总线SERCOS技术对开放式数控系统设计,增强了数控系统的开放性和柔性.研究成果已成功地应用于一台数控机床样机的开发.     

SERCOS总线协议及其在数控系统中应用

主要介绍SERCOS总线的通信模型、接口、协议、数据报结构和工作原理及其在数控系统中的应用。     

基于接口标准的开放式数控系统的研究与实现

确定了自主开发的开放式数控系统HITCNC的接口方案，包括相关的内部接口和外部接口。详细阐述了HITCNC系统中应用的主要开放技术，并在开放式数控系统的基本理论及实现技术的基础上，实现了基于接口标准的用于控制3坐标数控铣床的开放式数控系统HITCNC。一系列的切削实验，验证了HITCNC的开放性、可靠性及系统对自由曲线、曲面的加工能力。     

基于SERCOS总线的模拟驱动接口模块设计

SERCOS总线是一种广泛应用于数控机械装备的现场总线,选用SERCON816总线接口控制器、TLV5614数模转换器及TMS320F28335控制器,通过合理设计其接口电路并进行初始化设置和程序编写,实现了SERCOS现场总线信号与传统模拟信号的高速转换并在旧铣床数控改造中成功应用。为相关行业模拟伺服驱动的老旧设备改造提供了一种新思路。     

DM9000E在数控系统数字接口中的稳定性实验

以太网在数控系统数字接口中的运用是一个趋势,但通用的以太网芯片应用于数控系统数字接口通信稳定性未见报道。该文采用通用的以太网芯片DM9000E,通过模拟SERCOS协议实验,模拟系统在通信周期大于250μs时都可以稳定运行,结果表明通用以太网芯片也可以满足数控系统数字接口的要求。     

基于SERCOS接口的分布式离线插补数控系统设计

针对实时插补数控的不足和分布式离线插补数控对现场总线要求苛刻的问题,提出了基于串行实时伺服通讯协议SERCOS的分布式离线插补数控系统,给出了基于SERCOS周期性同步机制的分布式离线插补控制原理。以嵌入式操作系统为平台给出了上位机主控制器和智能伺服驱动器软硬件系统设计。     

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...     

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。     

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。     

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。     

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.     

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.     

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...