玻璃纤维网格布缺陷自动检测系统的研究

基于机器视觉设计了一种玻璃纤维网格布缺陷自动检测系统,可实现玻璃纤维网格布缺陷的识别以及分拣等功能。整个系统采用STM32作为运动控制处理器以实现机械手的运动控制,利用NI myRIO平台采集玻璃纤维网格布信息,设计玻璃纤维网格布缺陷识别算法,完成图像的处理与分析从而驱动机械手完成网格布的分拣。实验结果表明该系统可以实现玻璃纤维网格布缺陷的识别以及分拣。     

基于计算机视觉的晶振帽缺陷自动检测系统

针对工业现场中晶振帽的主要缺陷,通过计算机视觉系统来实现缺陷的自动检测.结合晶振帽的缺陷特点,论述了晶振帽缺陷检测系统的构成、图像处理及检测流程,提出一种基于计算机视觉的晶振帽缺陷检测方法.设计了缺陷检测系统的具体软件结构,并用模块化方法实现软件功能.该软件主要包括主程序模块、图像采集模块、图像处理模块和通信模块.实验证明,该检测系统能够准确地实现晶振帽缺陷的检测,满足自动化生产的需要,可在实际生产中代替人工检测.     

轴承外观缺陷检测系统的设计与实现

针对目前国内对轴承外观在线检测系统的要求和传统人工检测方法的不足,设计一套基于TMS320DM642的轴承外观缺陷在线检测系统。该系统硬件平台主要包括视频编解码模块、存储器模块、可编程逻辑控制器CPLD模块及核心DSP芯片;软件设计包括轴承图像采集、图像预处理、图像定位与剪裁、差影处理、形态学运算及缺陷标记识别等。实验结果表明,该系统稳定、识别率高、实时性好且可满足轴承外观缺陷的在线实时检测。     

基于HALCON的织物质量检测技术研究

为解决玻璃纤维织物人工检测时效率低、劳动强度大等问题,搭建了基于机器视觉的织物质量在线检测系统。根据视场和测量精度的要求,确定了图像采集模块中的相机、镜头和照明方式,形成了有利于图像处理的成像效果;在基于HALCON的图像处理模块中,提出了采用Blob分析法进行缺陷特征的提取,给出了图像分割、形态学处理和特征提取等过程的关键算子;对一些织物样品图像进行了实例验证。研究结果表明,采用本研究所述检测技术,可以简单、快速地实现织物缺陷特征的识别和缺陷特征参数的计算,检测结果稳健可靠,能够满足实际生产的需要。     

基于TMS320F2812的变频调速实验平台的硬件设计

介绍了一种基于TMS320F2812的变频调速实验平台的硬件设计方案,包括IPM驱动电路、电流检测模块、转速检测模块以及通信模块的设计。该系统通过调试验证了方案的正确性,为下一步实现复杂控制算法打下了基础。     

基于LabVIEW的超声检测虚拟仪器开发

介绍了在LabVIEW开发平台下开发超声检测虚拟仪器系统的过程,并给出基于VC++6.0环境编写数据采集卡动态链接库(DLL)驱动程序,通过LabVIEW的CLF模块调用这个DLL来实现数据采集.该系统不仅能实时显示采集的超声波信号,而且能够对焊缝的缺陷进行定位、定量和定性分析,实现了超声检测的数字化、图像化、智能化、自动化.     

基于图像处理库的机器视觉检测系统的研究

为满足机器视觉检测系统通用性的需求,设计出一套机器视觉检测硬件系统,并在此基础上设计出一种基于图像处理库的检测系统软件。该视觉软件包含一套应用于工业的图像和信号算法处理库,该库作为单独的软件模块,通过插件的方式为通用外观检测软件使用。利用图像处理算法组件分别配置图像处理链,对电容器外观底部露白缺陷和引脚变形缺陷进行检测实验,测试结果表明该视觉检测系统具有较好的通用性和实用价值,可以满足工业领域部分的图像和信号处理的需求。     

基于压力传感器的跌倒检测系统研究

通过研究中老年人常见的紧急事故——跌倒为研究对象,针对现有跌倒检测方法存在的诸多问题,我们设计了一种基于压力传感器的跌倒检测系统,该系统包含压力采集模块、基于微处理器的数据处理模块、无线通信模块和后台四个模块。通过检测并分析研究脚底压力在正常行走和跌倒状态下的变化,实现跌倒事件的实时检测。并在此基础上,提出基于支持向量机的跌倒识别方法。实验结果证明该系统的判别具有较高的可靠性和准确性。     

金属材料超声探伤缺陷分类辅助系统的研究

针对在目前工业生产的超声检测中缺陷难以定性的问题,在现有缺陷信号处理和人工神经网络分类研究工作的基础上,基于虚拟仪器的设计思想及功能模块化的设计方法,采用PC机和数据采集卡作为硬件系统,在L abV IEW平台上建立了能对缺陷进行智能识别的系统——金属材料超声探伤缺陷分类辅助系统。系统具有采集金属材料中缺陷回波数据、降噪、特征提取和智能识别缺陷等主要功能。实验结果表明,该系统基本上能自动识别出各类缺陷。     

基于虚拟仪器的某型无人机电气参数检测系统

针对某型无人机电气参数快速检测的需求,设计了一种基于虚拟仪器的无人机电气参数检测系统。该检测系统的软件设计采用LabVIEW软件开发平台,主要由数据采集模块、数据管理模块和数据分析与处理模块等组成。实际应用表明,该系统测试结果准确,具有运行稳定可靠、操作方便、维护简单的特点,达到了设计要求。     

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...     

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.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.