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Process variable

About: Process variable is a research topic. Over the lifetime, 3983 publications have been published within this topic receiving 43130 citations. The topic is also known as: process parameter.


Papers
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Journal ArticleDOI
TL;DR: A detailed investigation has been carried out to find out the impact of the process parameters including Tool rotational speed, welding direction at constant axial force and with a taper cylindrical pin profiled HSS tool during the friction stir welding (FSW) of AZ31B magnesium alloy lap joints.

29 citations

Patent
24 May 2000
TL;DR: In this paper, a method for determining process variable-measured values as a function of a control variable is presented. But the method is not suitable for the measurement of process variables and does not consider the statistical variation of the process variable.
Abstract: The method involves iteratively determining process variable-measured values as a function of control variable, so as to receive a set of process variable-characteristics. An expected value assigned to each value of the control variable is determined from a measured value-amount at the process variable-measured values. A determination is made whether the process variable-measured values depend on a statistic variation of the process variable. An alarm is outputted, and processing speed of the machining process is changed, if the measured values are not depending on the statistic variation. An independent claim is also included for a controller of a machine tool.

29 citations

Patent
20 Sep 2007
TL;DR: In this paper, a plurality of process variables may be analyzed to determine whether any of a number of faults associated with the process plant exist, and if one or more faults are detected, indicators may be generated.
Abstract: In methods and systems that may facilitate detecting abnormal operation in a process plant, values of a plurality of process variables may be analyzed to determine whether any of a plurality of faults associated with the process plant exist. If one or more faults are detected, one or more indicators may be generated. Analyzing the values of the plurality of process variables may include utilizing a coefficient matrix. The coefficient matrix may be generated based on process variable data corresponding to the known occurrences of faults.

29 citations

Journal ArticleDOI
TL;DR: A new high speed joining method for the micro range is presented, which is realized by a plastic forming process based on TEA-CO2-laser induced shockwaves, and it is shown how sheet–sheet joints can be realized with this method.
Abstract: The need to implement more functionality on the same space drives miniaturization and makes hybrid joints under various conditions also in the micro range necessary. Existing solutions often have restrictions due to the principle of joining. Thus, in this article a new high speed joining method for the micro range is presented, which is realized by a plastic forming process based on TEA-CO2-laser induced shockwaves. In a first step it is shown how sheet–sheet joints can be realized with this method. In order to get knowledge of basic process parameter and for further application of the process, the near-by-field of acting pressure of the initiated shock wave is measured in open and tube environment. The results show that constant maximum acting pressure conditions appear in a tube, while pressure characteristics show high reflection phenomena. Furthermore, it is determined that the ignition point of the TEA-CO2-laser induced plasma out of aluminum is about 8 mm above the surface.

29 citations

Patent
18 Jun 1990
TL;DR: In this paper, a method of controlling a process including at least two process variables and control efforts, with each control effort having an influence on at least one process variable, is presented.
Abstract: A method of controlling a process including at least two process variables and at least two control efforts, with each control effort having an influence on at least one process variable, including the steps of modelling the influence that a change in each control effort has on each process variable; describing the desired trajectory which each process variable will follow towards its desired value in response to a system change; and, coupling the control of each process variable; whereby changing a first set of at least one control efforts so as to cause a desired change in at least one process variable can be compensated for by a change in a second set of at least one control efforts so that substantially no influence in exhibited on other process variables in the system in which no change is desired. The method may include delaying a desired change in such first set of control efforts a time equal to the maximum dead time lapse of any control effort of such second set of control efforts relative to any such process variable for which no change in desired.

29 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202329
202266
2021289
2020318
2019281
2018274