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《Measurement》2016
Laser forming continues to be a promising technology in manufacturing due to its fast speed, flexibility, and low-cost. Measurement of deformation after laser forming is widely needed to verify its convergence to the intended shape in academic research. With the development of laser forming, high requirements on the measurement of the deformed work-piece have been sought such as a 3D profile of the deformed surface, a large measuring range, and measuring convenience. In this paper, a laser-based machine vision measurement system was developed to measure the 3D profile of deformed surface by a one-off scanning process. Based on the 3D profile data, the vertical displacement of the deformed plate was calculated for bending analysis. In addition, as one of the important feature parameters, transverse shrinkage was automatically determined through a novel image-based method during the scanning process. A measuring accuracy of 0.03 mm for vertical displacement measurement and 0.0125 mm for transverse shrinkage were achieved in the developed measurement system. This measurement performance is acceptable in most of the laser forming processes currently studied. 相似文献
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本文通过对抽油井可监测点的分析,论述了抽油井远程实时监控系统的软硬件构成,并提出了一种合理有效的通信协议。TY-100远程实时监控系统实际运行效果分析表明,该系统对抽油井的节能增效、科学管理起到重要作用。 相似文献
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1 总体方案设计
吊装机的控制系统的硬件由1台现场计算机、机器视觉定位系统和PLC系统组成2级分布式控制系统。由机器视觉定位系统检测并固定吊装对象物,当发现吊装对象物时,输入图像数据到下位机,利用VC开发的程序计算对象物的相对位置及体积。计算结果通过串口传输至下位PLC,由PLC驱动吊装机转动,并检测运动状况,到达吊装对象物的位置后执行下降和松钩动作。 相似文献
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针对散热器T型多立管相贯线壁障连续焊接难题,设计了基于工控机(IPC)和多轴运动控制器(6K4)的双焊枪自动焊接机控制系统.该系统采用VB编程控制各个子功能模块,并利用6000运动语言开发底层伺服驱动程序,上位机(IPC)直接通过以太网接口调用.整机控制系统能够完成各轴状态实时显示、电机伺服驱动、焊接路径规划、焊接参数自动调节等任务.实际焊接实验表明,该系统满足散热器焊接精度要求,能很好地完成T型管散热器相贯线处的焊接,提高了生产效率和焊接质量. 相似文献
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Development of machine vision system and dimensional analysis of the automobile front-chassis-module
In the present research work, an automated machine vision system and a new algorithm to interpret the inspection data has
been developed. In the past, the control of tolerance of front-chassis-module was done manually. In the present work a machine
vision system and required algorithm was developed to carryout dimensional evaluation automatically. The present system is
used to verify whether the automobile front-chassis-module is within the tolerance limit or not. The directional ability parameters
related with front-chassis-module such as camber, caster, toe and king-pin angle are also determined using the present algorithm.
The above mentioned parameters are evaluated by the pose of interlinks in the assembly of an automobile front-chassis-module.
The location of ball-joint center is important factor to determine these parameters. A method to determine the location of
ball-joint center using geometric features is also suggested in this paper. In the present work a 3-D best fitting method
is used for determining the relationship between nominal design coordinate system and the corresponding feature coordinate
system. 相似文献
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基于机器视觉技术的疲劳裂纹自动检测实验系统 总被引:1,自引:1,他引:1
为解决现有传统的金属疲劳裂纹检测方法存在的精度不高、操作繁琐、抗干扰性差和不易实现自动记录等问题,将虚拟仪器和图像处理技术应用到金属疲劳裂纹检测系统中,进行了疲劳裂纹长度在线测量和疲劳扩展速率计算。通过系统的整体设计和原理介绍,提出了疲劳裂纹在线非接触式的机器视觉检测方案;并基于LabVIEW的实验平台,进行了疲劳裂纹扩展试验,通过使用NI的IMAQVision实现了图像处理功能。研究结果表明,由该方案建立的基于图像处理技术的裂纹检测系统在线测量得到的最大裂纹长度测量误差为0.148mm,且由拟合裂纹长度一时间曲线的导函数可得到裂纹扩展速率,是一种较理想的疲劳裂纹在线检测方法。 相似文献
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在工控机及MCGS组态平台下开发了液压成型机自动监控系统,实现了液压机主体温度的实时控制与电极挤压长度的在线检测。独特的事件型报表为产品质量分析和工艺改进提供了可靠的依据。详细介绍了系统的硬件构成、软件设计与历史报表的制作。试运行表明系统大大提高了电极质量。 相似文献
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Wang Shuai Zhang Shubing Ma Ruoding Jin E. Liu Xinhui Tian He Yang Ruipeng 《Journal of Mechanical Science and Technology》2018,32(3):1317-1331
Journal of Mechanical Science and Technology - A remote control system based on the Internet and machine vision is designed in this study for tracked vehicles. The system consists of remote... 相似文献
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针对传统微纳光纤直径测量方法操作复杂、重复性差且易于损伤光纤等问题,开发了一套基于机器视觉的微纳光纤直径测量系统。首先,对系统采集的图像进行预处理和二值化分割,其次,通过Canny边缘算子实现微纳光纤边缘初定位,最后,基于改进Zernike矩的亚像素检测方法精确定位了亚像素级边缘。此外还提出了结合Hough变换与最小二乘法的算法拟合亚像素级边缘点的方案,将系统微纳光纤直径测量精度提升至纳米级。实验测量结果表明,该系统可实现3.51%以内误差的自动化测量,运行时间为2.671 s,更适用于微纳光纤尺寸的高精度实时测量。 相似文献
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一种机器视觉加权最小二乘解法 总被引:1,自引:1,他引:0
为了进一步提高机器视觉的重建精度,本文首次从参数方程的角度来重新审视机器视觉系统以及在此方程上提出了加权的最小二乘方法。机器视觉系统中,重建精度将随相机布局的不同而不同,即随相机与特征点的距离以及旋转矩阵的不同而变化。原有解算方法,并不区分这些不同,利用最小二乘法求取拟合误差最小点。针对这一不足,本文首先改变了机器视觉系统的基础,利用参数方程来描述系统模型,在此基础上,推导了加权的最小二乘方法,给有大误差布局的相机较小的加权,从而进一步提高精度。这种算法的关键是对权重的估计。文章最后的仿真和实验验证了本文算法的有效性。 相似文献
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基于机器视觉的保健酒可见异物检测系统研究与开发 总被引:2,自引:2,他引:2
针对国内某企业生产的125ml玻璃瓶装药酒内可见异物的检测要求,设计了一套基于机器视觉的高速检测系统,该系统包括机械传动子系统、多类型异物成像子系统、伺服控制子系统、图像识别与处理系统等.通过利用异物在图像中运动的连续性和噪声运动无序性等特点,提出了基于序列图像差分和阀值分割的检测算法,该方法首先采用Top-hat形态学滤波抑制图像噪声,通过三帧差分提取图像中的运动目标,然后提出改进二维最大熵阀值分割算法实现了目标的快速分割,最后根据异物运动的方向性确定是否存在异物并判断出产品质量.实验结果表明,研制的系统能够有效地检测出酒液中的异物,在检测精度、误漏检率等方面满足企业要求,已成功替代了原有的人工检测. 相似文献
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机器视觉系统是近年来的一个研究热点.现有研究成果在系统复杂度,价格和性能之间很难达到平衡。针对此问题,本文设计了一个以USB数码摄像头为图像采集设备。ARM为核心处理器的嵌入式机器视觉系统。该系统结构简单.可广泛应用在工业检测领域。 相似文献
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Arc welding robot system with seam tracking and weld pool control based on passive vision 总被引:3,自引:3,他引:0
Hong-yuan Shen Jing Wu Tao Lin Shan-ben Chen 《The International Journal of Advanced Manufacturing Technology》2008,39(7-8):669-678
The automatic control in square-wave alternating current (AC) gas tungsten arc welding (GTAW) is significant for a “teach and playback” robot to overcome the variation of the seam trajectory and the seam gap in the welding process. This paper presents a welding robot system based on the real-time visual measurement in the different levels of the welding current. The primary objective is to measure the offset of the torch to the seam center and the size of seam gap by passive vision, track the seam and control the weld pool in real time. A novel visual image analysis algorithm was developed for seam tracking and seam gap measuring, free from robot calibration. The control algorithm based on the knowledge base was established to control the weld formation by regulating the welding current and wire feed rate. The welding practice for the rocket storage tank demonstrates the efficiency of the proposed system. 相似文献