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计算机视觉检测AVI(AutomatedVisualInspection)技术是计算机检测的新发展,它使检测更具智能化、柔性化。文中介绍融AVI技术于FMS的生产零件状态检测系统,是计算机视觉技术在机械制造中零件检测的使用。 相似文献
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为解决计算机显示器的能源效率检测问题,在简要分析计算机能源效率标识计量检测现状的基础上,构建计算机显示器能源效率标识计量检测系统,并给出了测量结果的不确定度。不确定度结果表明:该系统检测计算能源效率的相对扩展不确定度为3.3%,小于允许值4.0%,满足计算机显示器能源效率标识计量检测要求。 相似文献
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为了提升药品缺陷检测效率,降低制药企业的生产成本,设计了一款基于计算机视觉的药片实时检测系统。介绍了计算机视觉检测系统的工作原理和硬件结构组成,并在此硬件结构基础上,提出了一种新型计算机图像分割和特征提取方法。实验结果表明,所述算法和系统能够显著提高药片缺陷检测准确度,可以达到99%,计算机视觉检测系统能够完全满足实时性、高识别率等要求。 相似文献
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汽车是由无数的精巧零件组成的,所以零件的质量会直接影响到汽车的质量,进而要想保证汽车的质量,首先就要保证零件的质量。而决定零件质量的最主要的因素之一的就是零件的精度。本文就主要对零件精度的检测技术进行了介绍,首先介绍了计算机视觉和图像处理技术,汽车零件的计算机视觉检测技术进行了介绍,基于CAD的计算机视觉检测技术进行了介绍,基于CAD的计算机视觉检测技术存在的问题进行了介绍,优化基于CAD的计算机视觉检测技术的措施进行了介绍,最后对计算机视觉检测技术展望进行了介绍并进行了总结。 相似文献
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提出了以计算机为核心 ,以传统齿轮检测仪器为基础 ,借助于可视化计算机软件、计算机接口技术等开发面向齿轮误差检测的虚拟仪器的思想 ,集先进的软硬件技术于一体 ,改变了传统齿轮检测仪器的概念 ,缩短了智能仪器开发的周期 ,实现了检测的自动化、数字化、可视化、智能化 ,提高了检测的效率、精度和可靠性。 相似文献
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供电系统电力参数的计算机检测方法 总被引:1,自引:0,他引:1
供电系统是我国最早成功运用计算机的行业之一,对电力参数的不同的计算机检测方法,构成了各种不同的计算机监测系统.这里就几种常用的供电系统计算机检测方法及其系统进行了分析和比较. 相似文献
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防止CAD作业拷贝方法的研究 总被引:1,自引:0,他引:1
为防止学生在计算机绘图实验中拷贝作业,借鉴水印嵌入方法,研究了AutoCAD图形文件拷贝的检测方法。把学生操作计算机的IP或MAC地址作为水印信息嵌入至学生作业文件中,检测时提取图形的水印信息,以检测作业是否拷贝而来。经教学实践检验,能较准确判断作业是否拷贝抄袭,显著提高了计算机绘图的教学效果。 相似文献
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凸轮检测数据的基准转换处理方法 总被引:3,自引:0,他引:3
论述了基准转换(旋转法)方法,在发动机凸轮升程误差评定中的应用。通过检测实例,简述了凸轮检测基准的转换过程和升程检测数据的处理方法。考虑到已配备了计算机和尚未配备计算机的检测需要。同时给出了用函数计算器和计算机进行基准转换处理程序。用函数计算器转换计算简便准确;用计算机转换处理,可将处理结果显示或打印出来。 相似文献
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As a part II of theis research, new local inspection planning strategy is proposed in this paper based on the proposed inspection
feature extraction method. In the local inspection planning stage, each feature is decomposed into its constituent geometric
elements for more effective inspection planning. The local inspection planning for the decomposed features are performed to
determine: (l) the suitable number of measuring points, (2) their locations, and (3) the optimum probing paths to minimize
measuring errors and times. The fuzzy set theory, the Hammersley’s algorithm and the TSP method are applied for the local
inspection planning. Also, a new collision checking algorithm is proposed for the probe and/or probe holder based on the Z-map
concept. Finally, the results are simulated and analyzed to verify the effectiveness of the proposed methods. 相似文献
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基于实时重构的自由曲面自适应布点方法 总被引:1,自引:0,他引:1
针对现有的自适应算法计算量庞大、在工程中可应用性不强的缺陷,提出在等距法布点的基础上,对测量点进行实时重构来指导三坐标测量机根据曲面本身特性自动增加测量点的方法。测量过程中,当通过拟合五次B样条曲线、三次B样条曲面判断现有测量点不满足精度时,利用两侧测量点的曲率半径,计算出需增加测量点的准确位置,重新拟合包含新检测点的检测样本,直到满足精度要求。以曲面样件为例,辅以计算机图形可视化验证该算法,实验结果表明该方法测量精度及重构精度均可满足数字化检测要求,且在工程应用中相比曲率自适应算法其计算量大幅下降,有效提高了曲面检测效率。 相似文献
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提出了面向数字化预装配的分层干涉检测算法,该方法把干涉检测过程分为粗检测、半精检测、精确检测三层,通过逐层检测,大大加快了干涉检测的速度,提高了检测的精确度,有助于预装配中优化装配序列的快速生成。 相似文献
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研究了一类流水作业质量检验的检验设备组合问题。工件的加工采用流水作业形式,加工过程包含若干个操作,各操作分别在其对应的机床上进行,并由对应的质量检验设备进行检验操作结果是否满足要求。对应每一工序存在多台候选检验设备,这些检验设备具有相同的检验功能,但检验代价和错检率不同。在不同检验设备组合下,工件的净收益期望值不同。本文以工件的净收益期望值为目标函数,给出了一种求解算法,并证明了由该算法所得到组合的最优性。 相似文献
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针对常见的串行多工序抽样检验方式,建立了工序间质量水平传递模型和质量检验成本模型,提出基于Pareto解评价的多目标优化蚁群算法;通过定义多目标解与理想解的相对距离为蚁群算法的启发函数,激励蚁群搜索可行解空间并发现最优解集;应用多目标优化蚁群算法解决质量检验计划优化问题取得了较好效果。 相似文献
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为提高复杂曲面零件的数控机床原位检测精度,分析影响接触式检测系统精度的各项因素及其误差补偿方法。对检测系统的主要误差来源如机床几何误差、测头预行程误差和测头半径误差进行分析研究。在对数控机床的几何误差进行分析和建模的基础上,采用激光干涉仪进行三轴数控机床的单项误差测量和补偿;针对测头检测过程中存在的预行程误差,提出基于径向基函数(Radial basis function, RBF)的预行程误差预测方法,获得测头预行程误差分布图,并对检测系统进行实时预行程误差的补偿;提出改进的三角网格模型顶点法矢计算方法,有效进行三维测头的半径补偿。通过实例零件的加工精度原位检测试验及其与三坐标测量机CMM检验结果的比较,验证了原位检测方法的有效性。 相似文献
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Wenhua Han 《Russian Journal of Nondestructive Testing》2008,44(3):184-195
The magnetic flux leakage (MFL) nondestructive evaluation technique is used extensively for in-service inspection of gas and
oil pipelines. Unfortunately, the MFL data obtained from seamless pipeline inspection is usually contaminated by various sources
of noise, which considerably reduces the detectability of defect signals in MFL data. In this paper, a new denoising algorithm
is presented for removing seamless pipe noise (SPN) and system noise contained in MFL data. The algorithm first utilizes the
new wavelet domain adaptive filtering method proposed by combining wavelet transform with the adaptive filtering technique
to remove SPN contained in MFL data and then exploits the coefficient denoising approach with wavelet transform to cancel
the system noise in the output of the wavelet domain adaptive SPN cancellation system. Theoretical analysis shows that the
proposed denoising algorithm has a better overall performance than the existing denoising algorithm. Results of application
of the proposed algorithm to MFL data from field tests are presented to demonstrate the performance of the proposed algorithm
compared with the existing denoising algorithm.
The text was submitted by the author in English. 相似文献
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Ahmed M. N. Mohib Hoda A. ElMaraghy 《The International Journal of Advanced Manufacturing Technology》2010,47(5-8):581-595
Current localization techniques have been successfully used for aligning sculptured surfaces with CAD models in inspection applications. However, tolerance specifications are not considered as an integral part of the localization process. The tolerance verification and comparison with measured surfaces occur at a later step to accept or reject the manufactured part. This two-step process prolongs the inspection time. For the first time, this paper presents a novel localization algorithm for inspection that integrates the tolerance specifications as an optimality criterion. A closed-form solution algorithm that applies 3D rigid body transformation using quaternion and uses a minimum acceptable deviation zone approach was developed. The formulation is based on the mathematical definitions from ANSI Y14.5.1 standards (American National Standard Institute) for form tolerances. The new iterative minimum acceptable deviation zone localization algorithm is formulated using four types of form tolerances: straightness of a median line, straightness of a surface line, flatness and cylindricity. It is applied and compared to several benchmark examples for validation. The results demonstrated the ability of the new localization approach to achieve comparable results but with less computation effort due to using a constraint satisfaction problem and a closed-form solution algorithm in the formulation. The merit of the new approach stems from its ability to increase the efficiency of tolerance verification during the inspection process. The applicability of the proposed algorithm to various types of tolerance is highlighted. 相似文献