圆管式直线电动机在并联机床上的应用

分析并联机床的特点以及伸缩杆的驱动方式,介绍了圆管式直线电动机的运行原理及优点;指出这种直线电动机在并联机床应用的方法、可行性和应用前景。     

机床进给用直接驱动直线伺服电动机

针对现代数控机床高速，高精发展趋势，分析了机床进给系统应用直线电动机的优缺点，阐述了不同结构类型直线电动机的特点及其相应的应用场合，总结了直线电动机直接驱动伺服系统的研究现状与发展趋势。     

数控机床用直线电动机高速进给单元应用设计

分析了直线电动机用于机床进给系统的结构特点，针对非圆截面加工的特殊要求，设计了用于数控机床进给系统的直线电动机驱动部件。     

圆筒型直线步进电动机在机床中的应用与推力计算

在分析平板型直线电动机在机床进给系统中的配置结构与存在问题的基础上,结合圆筒型直线电动机的特点,提出了将圆筒型直线步进电动机用于机床进给系统中的新方案.并开展了对圆筒型直线步进电动机的推力计算方法的研究,建立了圆筒型直线步进电动机电磁计算的有限元模型,得出了电动机力移曲线,模型试验证明了理论计算方法的可靠性.估算了电动机的平均推力,为进一步研究该电动机性能及在机床中的应用提供了有效的方法.     

先进的数控产品和控制技术

现代制造业的发展趋势：直线电动机驱动技术应用于大型机床，用于航空工业的并联机床，六主轴、十把刀具的高速车床，用于小型零件的超精密加工机床，该机床11个NC轴由两台SINUMERIK 840D控制。第一个系统控N8个轴，第二个系统控制3个轴；双主轴、五轴联动机床用于加工空中客车A380的零件；奔驰公司的大型项目“新V发动机”集成了西门子公司的网络技术，将各个加工单元联网控制管理。     

新型直驱四轴混联数控机床运动学分析

基于模块化设计技术,提出了一种完全由直线电动机驱动的新型四轴混联数控机床,并介绍了其基本结构型式.以该机床并联主轴模块为研究对象,建立了主轴机构运动学方程,并给出了机构的位置正逆解,由此得到机床主轴的工作空间分布.最后,基于雅克比矩阵,对主轴机构进行了运动性能仿真研究,为机床主轴的运动性能优化和运动控制提供了理论依据.     

专利

专利名称：双直线同步电动机驱动的精密重型机床磁悬浮运动平台 专利申请号：CN201020614007.X公开号：CN201881156U 申请日：2010.11.19公开日： 2011.06.29申请人：沈阳工业大学 本实用新型提供一种双直线同步电动机驱动的精密重型机床磁悬浮运动平台,包括运动平台和两个长定子直线同步电动机及其控制系统。直线同步电动机主要包括定子铁心和可以与定子铁心做相对运动的动子铁心。     

从机床展览会上看直线电动机的应用前景

1　机床展览会上的直线电动机展品　　分析 12届 EMO展览会 (汉诺威 ,1997年 )上最有前途的展品表明 ,在高速机床的进给机构中愈来愈多的采用直线电动机传动装置。传统的进给机构传动装置包括旋转运动的电动机和将旋转运动转变成直线运动的机械传动装置 (滚珠丝杠副、齿条等 ) ,它们的技术特性已不符合高工艺性概念的机床要求 ,因其最大位移为 6 m,最大速度为 6 0 m/ min,加速度 <10 m/ s2 。在实现高工艺性概念的机床上 ,最好采用直线电动机传动。这种电动机无需利用机械传动装置 ,可实现直接驱动。在结构上 ,它是直线位移机构的传动元件…     

直线电机进给系统特点及改进方案

分析了直线电动机用于机床进给系统的优缺点,从机电一体化设计出发,并综合考虑与直线运动速度、精度和控制方式有关的各项技术,从而提出了直线电机用于机床进给系统的几种改进设计方案     

Fooke五轴加工中心

Fooke公司对机床进行了重新设计,在研制的五轴加工中心上采用了直线电动机。机床的动态性能比迄今的机床高出3倍。     

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...     

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...     

分布动态载荷识别的抗噪处理

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.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

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。     

The laboratory simulation of abrasive wear

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.     

Fractional order nonsingular terminal sliding mode control for flexible spacecraft attitude tracking

This paper investigates a fractional terminal sliding mode control for flexible spacecraft attitude tracking in the presence of inertia uncertainties and extern...     

奥氏体不锈钢表面双辉等离子渗锆的动力学

利用双辉等离子渗金属技术在0Cr18Ni9Ti奥氏体不锈钢表面制备了一层均匀、致密、呈良好冶金结合的渗锆合金层,并对1 060℃下的渗锆动力学进行了研究。结果表明:随着距锆合金层表面距离的增加,锆元素的含量呈梯度递减,扩散系数逐渐减小,而扩散激活能逐步增大;在1 060℃采用双辉等离子技术渗锆时,渗锆合金层表层的空位密度为2.945×(1012~1013)cm-2,与相同温度下采用常规渗金属工艺相比,提高了1~2个数量级。     

气化炉三维扫描测量与数据处理

以德士古气化炉耐火砖的内壁蚀损检测设备为基础,对采集到的点云数据做了进一步处理.通过对数据的筛选和剔除,实现了数据点的平滑降噪细化和精简.然后利用点云对整、网格划分和分色显示等方法,最终完成了内壁腐蚀情况的三维建模.重点讨论了点云数据的预处理及后处理的方法,并根据内壁耐火砖的腐蚀阈值,提出了一种气化炉内壁腐蚀区域的识别与分割方法.对耐火砖的腐蚀分析、气化炉的生产与维修提供了可靠依据,并在工程应用中获得了一致认可.