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操控电路中的“数同步隔离”技法(Ⅱ) 被引量:1
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作者 汪培成 《低压电器》 北大核心 1994年第6期45-47,共3页
二、“数同步隔离”及“数同步隔离”矩阵当我们把两个以上的相同计数器联合使用时,可以有几种运用形式.将它们串接使用,可以扩展计数器的数输出,即扩展步进控制的工步量;将它们中的一个作主计数器,另外的计数器作子计数器运用,可以以... 二、“数同步隔离”及“数同步隔离”矩阵当我们把两个以上的相同计数器联合使用时,可以有几种运用形式.将它们串接使用,可以扩展计数器的数输出,即扩展步进控制的工步量;将它们中的一个作主计数器,另外的计数器作子计数器运用,可以以子工步法来扩展步进控制的工步量;将它们作“数同步隔离”运用时,可以扩展单个工步所能容纳的操控内容量.前两者,适用于内容少而工步多的操控;后一种“数同步隔离”;适用于工步少而内容多的操控.下面只讨论“数同步隔离”. 展开更多
关键词 操控电路 数同步隔离 计数器
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Vibration Analysis and Direct Control of XY Table Automated Assembly Machines
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作者 Charfeddine Mrad 《Journal of Mechanics Engineering and Automation》 2013年第1期7-13,共7页
XY table automated assembly machines ensure time saving and quality improving in the electronics industry. Recently, due to the need of higher operation speeds and lighter machines in PCB (Printed Circuit Board) ass... XY table automated assembly machines ensure time saving and quality improving in the electronics industry. Recently, due to the need of higher operation speeds and lighter machines in PCB (Printed Circuit Board) assembly, a challenging problem has arisen which is the table positioning vibration. The high speed with the machine flexibility, make the positioning vibration inevitable although the inner control. The positioning vibration is to be reduced otherwise the machine becomes useless. Firstly, the machine is modeled, the positioning vibration is formulated, and then analyzed. Secondly, using the analysis, three direct control methods are identified to decrease the positioning vibration, they are based on the kinematics, dynamics, and operation of the machine. Thirdly, the methods are examined numerically to evaluate their efficiency. Lastly, the identified methods are discussed to conclude on their application. The results are a real contribution in the vibration control of XY table automated assembly machines, which is classified as industrial knowhow. 展开更多
关键词 Assembly machines XY table positioningvibration vibration analysis direct control.
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