基于Halcon的齿轮缺陷检测系统设计

针对当前齿轮缺陷检测过程中存在的问题,提出了一种基于Halcon软件开发的齿轮缺陷检测系统的设计方案,实现了测量系统中图像采集与显示、图像处理及运行控制等功能。首先控制转盘运行并利用CCD摄像机实时采集齿轮图像;然后进行图像预处理并对图像进行自动阈值化分割,获得齿轮的中心坐标和轮廓信息;最后基于形态学方法分析各个齿的尺寸并从中识别齿轮存在的缺陷。实验表明,该系统具有较高的测量精度和测量效率,能够满足实际生产的需要,为齿轮无损在线测量提供了新的途径。     

基于机器视觉的齿轮参数测量系统设计

针对当前齿轮测量中存在的问题,提出了一种基于机器视觉的齿轮参数测量方法.介绍了系统的软硬件组成及其各部分的功能.重点对数字图像采集、图像预处理和图像分割技术等方面进行深入研究,提出了基于数学形态学的齿轮中心定位和齿数计算方法,在此基础上通过公式计算获得齿轮的其他参数.该方法不需要进行边缘检测,实现简单.运行实验表明,系...     

基于图像识别的齿轮尺寸测量研究

为解决传统工业测量中,齿轮参数尺寸测量方法过于繁琐的问题,利用数字图像处理技术对其进行检测,提出了一种基于圆投影分割的齿轮参数尺寸检测方法。该方法首先通过图像预处理得到细化的齿轮轮廓,使用改进随机采样算法找到齿轮中心;然后利用轮廓点和图像中心点连线与所建立的图像坐标系正向X轴所成角度和两点距离的映射关系,建立新的极坐标系,并对齿轮进行圆分割,记录新坐标系中峰值点个数和峰值点纵坐标,这2个参数分别对应齿轮齿数和齿顶圆半径;最后利用齿顶圆半径与齿数、模数之间的关系式,求出模数,从而求出齿轮其他尺寸。实验结果表明,用该方法检测齿轮参数尺寸,检测速度快、精确度高,具有较高的实用价值。     

空间矩定位齿轮齿距视觉检测

针对齿轮的精度测量问题,采用基于机器视觉的非接触检测方法,运用MATLAB软件中图像处理模块,实现了对圆柱齿轮齿距的测量。通过对图像的预处理,在运用Canny算子提取齿轮边缘的基础上,用空间矩边缘检测法,计算出一维阶跃边缘的前三阶空间矩,得出实际模型中边缘位置,提取出齿轮亚像素边缘。对比了两种齿轮中心定位方法,完成了对齿轮中心的精确定位。通过构造虚拟圆,获取分度圆上齿轮齿距。所提出的基于机器视觉的齿轮齿距检测方法具有很好的应用前景。     

利用Hough渐开线变换的齿轮图像中心检测

针对目前基于机器视觉的齿轮参数测量和检测中,获取齿轮中心坐标这一关键步骤缺乏通用性的问题,提出了一种利用Hough渐开线变换的方法。首先,在图像坐标中建立齿轮渐开线齿廓的数学模型。接着,对齿轮的灰度图像进行卷积、边缘检测获得齿轮边缘图像和像素梯度角。最后,对边缘像素做Hough渐开线变换,得到最终的齿轮中心坐标。实验和仿真结果表明,按该方法求得的结果与真实坐标的标准差在1 pixel以内,对齿轮内孔形状无要求,可以作为一种有效的齿轮图像中心检测方法。     

齿轮参数图像的软件识别

基于MATLAB图像处理技术,详细介绍了应用图像处理的方法对齿轮图像进行预处理,并进行齿轮图像的边缘提取,根据图像的轮廓对齿轮进行下一步的测量,提出了一种简单的非接触测量方法来确定齿轮齿顶圆。利用该算法对在不同状态下的同一齿轮进行图像识别,得出不同结果,确定外界环境对齿轮参数分析的精度影响,分析所得结果误差,并选择最接近真实值的方案。文中选取了同一齿轮在两种不同的放置条件下的参数读取,黑色背景在不同角度的测量,白色背景不同颜色齿轮的测量。将两种观测条件下所得的不同结果与理论结果进行对比,发现齿轮外径读取与图片背景颜色和所选图片角度有关系,在偏转接近60°和齿轮颜色接近亮色时的情况下测量结果更加接近理论值。     

中心距偏差对微线段齿轮系统的动力学特性影响研究

为了提高微线段齿轮的应用性,从中心距偏差的角度对微线段齿轮的动力学特性进行了研究.依据微线段齿轮齿廓构型原理,基于齿轮啮合关系推导了其齿廓数学模型;采用离散化TCA(齿面接触分析)方法计算了微线段齿轮的传动误差,分析了不同中心距偏差对渐开线和微线段齿轮的传动误差和侧隙的影响;通过建立微线段齿轮动力学模型,分析了渐开线和微线段齿轮在不同载荷、转速下中心距偏差对动态响应的影响.结果表明:微线段齿轮比渐开线齿轮对中心距偏差更为敏感;在低速轻载工况下,渐开线齿轮的动力学特性更好,在载荷较大的工况下,尤其是在中高速重载工况下,当中心距偏差被控制在一定范围内时,微线段齿轮具有更好的动态特性.     

虚拟齿轮测量中心工件模型预处理算法研究

在虚拟齿轮测量中心对复杂模型进行测量时,存在大量碰撞检测数据,提出一种碰撞检测前对模型表面数据提前预处理的方法。该方法采用空间体素数据结构算法思想,使测头能够准确获得有可能发生碰撞的模型表面数据,相比于原有遍历式扫描检测算法,避免了频繁计算测头到模型各个三角面片的距离,提高了算法效率。结合开发的虚拟齿轮测量中心软件系统进行预处理算法的测试评估,通过试验验证了预处理算法的可行性和正确性,最终实现了工件模型预处理功能。     

基于CCD的齿轮参数测量系统的研究

研制了一种基于CCD图像的齿轮参数测量系统 ,给出了采用数字图像处理技术非接触测量几何参数的方法 ,包括图像的预处理、二值化、轮廓提取以及齿轮参数的计算等 ,分析了误差产生原因 ,通过测量实例证明了该方法在实际应用中的可行性和正确性。     

图像识别技术在齿轮质量检测中的应用

针对齿轮缺陷的评定问题,利用计算机图像识别技术,对缺陷部位进行数字成像、图像预处理、图像分析和特征提取,在此基础上,对典型缺陷进行了模式识别.应用先进的数字图像处理技术是实现产品质量监控和故障诊断的有效方法.     

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...     

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。     

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。     

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.     

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.     

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。     

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....     

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.