铝轮毂精密检测机智能控制系统的研究

介绍了铝轮毂精密检测机的智能控制系统的组成及其实现方法;提出并建立了基于实时专家数据库的误差分离与补偿控制解决方案,消除了铝轮毂定位误差、滚珠丝杆和光栅尺线性误差、光电编码器圆周误差以及伺服电机转角误差对检测精度的影响。同时,采用测头移动和测量轴旋转独立闭环控制技术,最大限度地降低了系统误差,保证了检测机的测量精度。     

无刷直流轮毂电机性能测试平台设计

随着轮毂电机的深入研究,有必要建立专用的轮毂电机性能测试平台。以数字信号处理器(DSP)为核心,设计了无刷直流轮毂电机控制系统的硬件和软件,搭建了轮毂电机性能测试平台,并基于此平台对所设计控制系统进行测试,试验结果表明所设计控制系统符合设计要求,且对一台无刷直流轮毂电机样机进行效率测试,得到了实验样机的转矩转速曲线和效率map图,结果表明该平台满足轮毂电机性能测试试验要求,能为轮毂电机的设计优化提供试验支持。     

铝合金轮毂精密检测机的误差分离与补偿技术研究

铝合金轮毂精密检测机是一种全自动化的高档轿车铝合金轮毂高精密检测设备,设计检测精度远高于其关键部件的制造精度,采用适当的误差分离与补偿是保证良好性能和性价比的重要措施.文中详细介绍了一种采用单测头重复多圈、重复检测分离轮毂定位误差的原理和实现方法,以及滚珠丝杆螺距误差的补偿方法.     

基于机器视觉汽车轮毂尺寸自动测量系统的研究

汽车轮毂是汽车中整车行驶部分主要承载件,轮毂各个尺寸的精度直接影响了正常的行驶性能,传统简易量具对轮毂的各项尺寸进行测量,耗时过长,效率低下,为提高轮毂的检测效率,本文研制汽车轮毂尺寸的自动测量系统,基于机器视觉,采用运动控制系统,对轮毂相关尺寸进行精确测量。实验结果表明,该系统能完成对轮毂中心孔定位,PCD孔节圆自动化测量,该系统测量精度高、效率快,能够实现对轮毂圆形特征的测量。     

反射镜式光电系统光路内嵌复合轴稳定平台

为满足高机动装甲车辆对光电瞄准系统视轴高稳定精度的要求,设计了光路中嵌入快速反射镜的反射镜式光电系统复合轴稳定平台。首先,利用施奈尔反射镜定律的矢量方程,构建系统视轴矢量方程,研究其运动特性、稳定补偿原理;然后,分析了控制方法、控制系统频率特性,分析结果显示,传统稳定平台控制系统的截止频率26Hz,而复合控制系统的截止频率为215Hz,控制系统带宽提升了8倍以上;最后,构建了复合轴稳定平台实验装置、测试装置,介绍了实验方法、稳定精度测试原理,开展了复合轴平台与传统平台的稳定精度比较实验。实验结果表明,在相同的实验条件下,复合轴平台较传统平台的稳定精度提高了5倍以上,反射镜式光电系统光路内嵌复合轴稳定平台能够实现光电瞄准镜的高精度稳定。     

基于DSP的电路故障检测平台研究

为了克服传统电路故障诊断平台应用和普及的不便,根据电路故障诊断系统的特点,搭建实现了基于DSP芯片TMS320C5416的检测平台,测试结果显示了该系统平台软硬件的实用性.     

控制技术在空瓶检测过程中的应用

空瓶检测机主要用于检测回收的饮料瓶的缺陷、赃物、残留液等,在现代化的高速的饮料生产包装线上,空瓶检测机是不可缺少的高科技设备之一.是集光、机电、传感技术、图像处理与识别为一体的综合性高科技设备.介绍了空瓶检测机的工作原理及控制技术在空瓶检测机的应用.着重介绍了基于PLC的控制系统基于DSP的控制系统以及基于视觉传感器的...     

重卡轮毂轴承总成轴肩及内径尺寸检测机控制系统设计

针对目前国内重型卡车(简称重卡)轮毂轴承总成检测设备尚未成熟,人工检测精度不高、效率低下等问题,详细阐述了重卡轮毂轴承总成轴肩及内径尺寸检测机的主要结构、关键检测位置等重要组成部分,并从主要检测工艺流程出发,设计了一款适合该检测机的控制系统,重点设计了该控制系统的硬件、软件部分,并对控制系统的关键部分进行布线组装;应用该检测机进行在线自动检测。从调试检测结果发现,该控制系统运行稳定,能够准确根据设置的标准参数检测到重卡轮毂轴承总成轴肩宽度及轴承安装孔内径尺寸,并且判断工件尺寸是否合格,验证了该控制系统设计的可行性。该检测机目前已在企业的智能装配线中使用,基本满足企业自动化生产要求。     

系统误差对铝轮毂检测精度的影响分析

智能铝合金轮毂精密检测机是一种全自动化高档轿车铝合金轮毂高精密检测设备,设计检测精度远高于其关键部件的制造精度,采用适当的误差分离与补偿是保证良好性能价格比的重要措施.并且详细分析了铝轮毂装夹定位误差、测头移动定位误差,以及测量基准轴径向晃动和轴向窜动等系统误差对检测精度的影响,为采取相应的误差分离和补偿措施提供了理论依据,对保障检测精度具有重要意义.     

基于LabVIEW的温度参数测试系统设计

针对传统测试实验平台的功能单一、操作复杂、扩展性差等问题,在CSY传感器实验台的基础上,开发基于虚拟仪器的温度参数测试系统,对温度参数的检测原理、检测方法进行了分析,并对测试系统硬件结构、测试系统软件设计和数据采集等关键技术进行了研究.结果表明:该系统可进行温度参数测试实验,测试系统交互性好,性价比高.     

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.