为了提高窄间隙焊接的智能化水平,文中基于被动视觉传感方法,提出一种同步性好、鲁棒性强的窄间隙焊接图像坡口边缘感兴趣区域(region of interest,ROI)窗口的自适应定位方法,解决焊接过程中因坡口宽度变化带来的坡口边缘位置定位难、...为了提高窄间隙焊接的智能化水平,文中基于被动视觉传感方法,提出一种同步性好、鲁棒性强的窄间隙焊接图像坡口边缘感兴趣区域(region of interest,ROI)窗口的自适应定位方法,解决焊接过程中因坡口宽度变化带来的坡口边缘位置定位难、检测精度差的问题.通过调节坡口边缘ROI窗口水平平移量,揭示ROI窗口位置对坡口边缘图像背景与目标占比和边缘特征提取精度的影响规律,建立与电弧位置同步的坡口边缘ROI窗口生成机制,实现焊接过程中坡口边缘ROI图像的精准生成和坡口边缘的精确提取,从而提高窄间隙焊接工艺的适用性.通过变坡口焊接试验,进一步验证了所提方法在坡口边缘定位和检测中的适应性和有效性.结果表明,当坡口边缘ROI窗口顶点横坐标的水平平移量为ROI窗口宽度的50%时,检测的坡口边缘位置与平均位置差值的绝对值小于3.53μm,检测平均时间小于30 ms/帧,满足窄间隙焊接过程参数检测的精度和实时性要求.展开更多
By using Bi(S2CNEt2)3 as single-source precursor, Bi2S3 nanoflowers and nanorods have been obtained via a solvothermal treatment. The effect of water, ethylene glycol and polyethylene glycol as reaction medium on the ...By using Bi(S2CNEt2)3 as single-source precursor, Bi2S3 nanoflowers and nanorods have been obtained via a solvothermal treatment. The effect of water, ethylene glycol and polyethylene glycol as reaction medium on the structure and shape of Bi2S3 nanosized materials was investigated, and Bi2S3 nanoflowers and nanorods were characterized by SEM, TEM and XRD.展开更多
文摘为了提高窄间隙焊接的智能化水平,文中基于被动视觉传感方法,提出一种同步性好、鲁棒性强的窄间隙焊接图像坡口边缘感兴趣区域(region of interest,ROI)窗口的自适应定位方法,解决焊接过程中因坡口宽度变化带来的坡口边缘位置定位难、检测精度差的问题.通过调节坡口边缘ROI窗口水平平移量,揭示ROI窗口位置对坡口边缘图像背景与目标占比和边缘特征提取精度的影响规律,建立与电弧位置同步的坡口边缘ROI窗口生成机制,实现焊接过程中坡口边缘ROI图像的精准生成和坡口边缘的精确提取,从而提高窄间隙焊接工艺的适用性.通过变坡口焊接试验,进一步验证了所提方法在坡口边缘定位和检测中的适应性和有效性.结果表明,当坡口边缘ROI窗口顶点横坐标的水平平移量为ROI窗口宽度的50%时,检测的坡口边缘位置与平均位置差值的绝对值小于3.53μm,检测平均时间小于30 ms/帧,满足窄间隙焊接过程参数检测的精度和实时性要求.
文摘By using Bi(S2CNEt2)3 as single-source precursor, Bi2S3 nanoflowers and nanorods have been obtained via a solvothermal treatment. The effect of water, ethylene glycol and polyethylene glycol as reaction medium on the structure and shape of Bi2S3 nanosized materials was investigated, and Bi2S3 nanoflowers and nanorods were characterized by SEM, TEM and XRD.
基金National Natural Science Foundation of China(11405253,U1332205)Youth Innovation Promotion Association CAS and the Research Program of Science and Technology Commission of Shanghai Municipality(14DZ2261200)
