Machine status monitor in control room in factory

Global Adaptive Output Feedback Control for a Class of Nonlinear Time-Delay Systems

Abstract: This paper addresses the problem of global output feedback control for a class of nonlinear time-delay systems. The nonlinearities are dominated by a triangular form satisfying linear growth condition in the unmeasurable states with an unknown growth rate. With a change of coordinates, a linear-like controller is constructed, which avoids the repeated derivatives of […]

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Top 10 Differences Between ICS and IT Cybersecurity

In many, if not most plants with industrial control systems (ICS), ICS engineers and their internal information technology (IT) counterparts have very different perspectives on cybersecurity. Not surprisingly, these different perspectives often lead to conflicts when connecting an ICS to the plant’s IT system. In the past, because industrial control systems used proprietary hardware and […]

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Getting Concentration Measurements from Common Inline Sensors

Ultimately what we want to know and control is the concentration of key components. Relatively inexpensive inline measurements can be used under the right conditions to provide concentration measurements. Understanding the limitations as well as the capabilities is essential to success. Here we look at how we can elevate the use of capacitance, conductivity, density, […]

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ISA Recognizes 2014 ISA Honors and Awards Recipients

The 52nd Annual ISA Honors & Awards Gala was held on November 10 at the Arvest Bank Theatre at The Midland, Kansas City, Mo. The Honors and Awards program provides an opportunity for ISA to recognize outstanding individuals, corporations, and sections and divisions for the contributions they have made to the Society and/or the automation […]

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Webinar Recording: How to Design a High-Performance HMI

“Please don’t talk to me about technologies that can improve my plant’s performance. I can’t stand the idea of disrupting my current situation with anything new, even if it’s better.” “So, how is the plant running these days?” “Just fine.” Unfortunately, this imagined dialogue isn’t all that imaginary. Despite the great progress we’ve made in […]

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The Gift – ISA 2014 Fall Leaders Meeting

It seems like just yesterday that we were all very much engaged in the ISA 2014 Fall Leaders Meeting. In case you missed it, this year’s event was held in Kansas City, Missouri at the Marriott downtown. And I personally felt like I was in the midst of what author Gary Harpst calls the Six […]

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Inferential Measurement of Cell and Crystal Growth Rate and Reaction Rate

Simple online inferential measurements of cell growth rate, crystal growth rate, and chemical reaction rate are possible using conventional online measurements of flow and temperature. These inferential measurements enable the monitoring and control of process efficiency and capacity. For continuous operations, the indication of product formation rate can be used for maximizing yield at an […]

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The Art of Level Instrument Selection

In the January/February 2013 issue of InTech, Donald Gillum wrote an excellent article titled Level Measurement: Determining Interface Position Between Two Media. In that article, Gillum discussed the various types of level instrumentation used by industry today and described how they work and some of the advantages and disadvantages of each. This article is a follow-up […]

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