力矩电动机驱动的砂轮自动更换系统试验台调试和检测

提出了一种适用于力矩电动机的伺服优化方法,通过添加低通滤波器的方式实现电动机性能的优化.首先分析了力矩电动机的幅频特性与相频特性,然后根据分析结果添加低通滤波器并调节相应参数.重复上述调试过程,从而获得合理的优化参数和理想的电动机性能曲线,达到了消除噪声、增大力矩电动机的速度增益及位置增益的效果,提高了力矩电动机的精度和刚度.最后利用激光干涉仪测量系统对试验台进行检测,证明定位精度和重复定位精度指标均满足.     

有限转角力矩电动机的转矩分析与优化处理

详细介绍了稀土永磁的有限转角力矩电动机装置的基本原理，并从实际角度设计出了双余度无刷力矩电动机，同时对该电动机的转矩进行了工作原理的说明，并阐释了计算方法。     

高力矩密度振镜电动机设计

提出了一种基于麦克斯韦电磁力原理的新型高输出力矩密度振镜电动机磁路结构，对该型振镜电动机的工作原理进行了分析，建立了其输出力矩的理论模型，并进行了有限元仿真分析。仿真结果表明，与尺寸近似的传统的安培力原理振镜相比，文中提出的振镜电动机可以实现传统安培力原理振镜电动机7.9倍的输出力矩密度。通过对所设计的振镜电动机进行控制系统建模仿真，进一步分析出文中所设计的高输出力矩密度振镜电动机的电流环与位置环的闭环控制带宽，分别为10.50、1.16 kHz，与传统的振镜电动机相比，在参数上具有明显的优势。     

选择进给传动用电动机的程序

进给传动机械系统的参数和对传动的技术要求,是自动化选择电动机的原始数据。首先进行静态计算,计算结果确定电动机所需要的静态力矩,并据此从自动化手册中初步选出电动机。然后进行动态计算,确定电动机的最大力矩,并据此最终选定电动机。     

摇篮式五坐标加工中心C轴转台旋转故障原因分析与处理

针对HS664RT,摇篮式五坐标加工中心力矩电动机驱动的C轴转台故障,介绍了故障排查、处理方法和力矩电动机相位角同步设置步骤。     

力矩电动机在磨齿机分度头架中的应用

根据实际生产要求,对力矩电动机和角编码器进行了选型计算,并给出了较高精度的安装方法。使用Ansoft软件绘制出电动机瞬态空载磁力线分布,通过加装铝罩的方法改善电动机漏磁并减少其受到的外界电磁干扰,为磨齿机分度头架力矩电动机的应用提供了参考。     

直驱电动机的发展及应用

直驱电动机的原理及类型直驱电动机是直接驱动式电动机的简称,主要指电动机在驱动负载时,不需经过传动装置。由于直驱电动机避免使用了传动带等传动设备,而这些传动部件恰恰是系统中故障率较高的部件,所以使用直驱电动机的系统,从技术上讲应具有更低的故障率。使用传动装置（如减速齿轮、带轮等）的机械系统,常常结构复杂,体积庞大,重量增加,而且带来系统运行成本、噪声及传动效率等方面的多种问题。直驱电动机的诞生使得驱动装置变得更紧凑,重量更轻,控制起来也更加容易。直驱电动机根据其制造的原理不同主要可以分为两类,力矩电动机和直线电动机。（1）力矩电动机。直流力矩电动机的工作原理与普通直流电动机相同,不同之处在于其结构。为了     

数控高精度高速专用磨床头架驱动设计分析

以数控高精度高速专用磨床的头架驱动系统为研究对象,分析了H405-AJ数控专用磨床头架的机械结构;根据H405-AJ的运行精度要求,采用了回转精度高、负载循环能力强、反应迅速、频带展宽及工作稳定的力矩电动机,实现了磨床头架系统的"零传动";详细介绍了磨床头架力矩电动机的特性和选型过程。结果表明,所选的磨床头架力矩电动机完全符合技术要求。采用力矩电动机作为驱动系统的磨床头架结构紧凑,具有高刚性及无摩擦,总体尺寸减小,为其他高精度高速外圆磨床驱动的设计提供了参考。     

实芯转子感应电动机结构及其应用

介绍了实芯转子感应电动机的结构特点及其在工业中的三种应用,即实芯转子交流力矩电动机、螺旋运动实芯转子感应电动机和调压调速感应电动机。     

新型行波压电电动机的结构研究及理论分析

环型和圆盘型行波压电电动机小直径条件下,输出性能逐渐失去低速大力矩的特点。由于结构限制,其定转子的动态点接触导致电动机运转不平稳、磨损大和驱动力矩小等不足。针对这些不足提出一种新型行波柱面驱动压电电动机,将传统的点接触改进成现在的线接触,即环型或圆盘型定子改进成圆柱型定子。阐述了行波压电电动机的运行机理以及电动机驱动系统原理。通过对压电电动机定子结构的振动理论分析,证明此新型结构电动机符合一般压电电动机形成驱动及正常工作的基本条件。利用ANSYS有限元软件分析电动机定子的振动模态, 给出选取振动模态的理论依据。制作了直径为20 mm的柱面驱动压电电动机,并对其输出特性进行测试,得到测试结果为输出力矩／质量比是0．426。     

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...     

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.     

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。     

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...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

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.