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Automation industry articles from ISA

Fig. 1. Feedback control system with a gain phase margin tester.

Robust PID Tuning Strategy for Uncertain Plants Based on the Kharitonov Theorem

Abstract: In this paper, the Kharitonov theorem for interval plants is exploited for the purpose of synthesizing a stabilizing controller. The aim here is to develop a controller to simultaneously stabilize the four Kharitonov-defined vortex polynomials. Different from the prevailing works, the controller is designed systematically and graphically through the search of a non-conservative Kharitonov region […]

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Energy harvesting is the extraction of usable energy (usually converted into electrical energy) from otherwise wasted energy available in the environment.

Energy Harvesting: Practical Reality for Wireless Sensing

What is energy harvesting? Energy harvesting is the extraction of usable energy (usually converted into electrical energy) from otherwise wasted energy available in the environment. On the macro scale (MegaWatts – MW) this includes hydro-electricity, wave power, solar panels, and wind turbines. However for wireless sensing, we are talking about harvesting immediately available energy such […]

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Developing Manufacturing Skills for Economic Growth

Developing Manufacturing Skills for Economic Growth

Recent reports from two of the biggest consulting firms in the world, Boston Consulting Group and Accenture, looked at what is euphemistically being called on-shoring. What their research shows is manufacturers are discovering China is not as cheap as everyone thought. When you factor in everything from the shipping of goods to the availability of […]

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Fig. 1. Experimental setup for control of temperature process by pulse width modulation

PID gain scheduling using fuzzy logic

Abstract: A simple, yet robust and stable alternative to proportional, integral, derivative (PID) gain scheduling is developed using fuzzy logic. This fuzzy gain scheduling allows simple online duplication of PID control and the online improvement of PID control performance. The method is demonstrated with a physical model where PID control performance is improved to levels […]

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Michael Lopresti

Young Innovators: Internship Opportunities Lead to Automation Future

InTech magazine has launched a new column called “Young Innovators.” The column will focus on “talking shop with the next generation.” The inaugural contribution comes from Michael Lopresti. Lopresti is a senior Industrial Engineering student and collegiate swimmer at the University of Missouri, dually enrolled in the Crosby MBA program. Here is an excerpt from […]

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PFDavg for 1oo2 voting devices with common cause

Viewpoint on ISA TR84.0.02 Simplified Methods and Fault Tree Analysis

Abstract: ANSI/ISA-S84.01-1996 and IEC 61508 require the establishment of a safety integrity level for any safety instrumented system or safety related system used to mitigate risk. Each stage of design, operation, maintenance, and testing is judged against this safety integrity level. Quantitative techniques can be used to verify whether the safety integrity level is met. […]

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Virtualization allows one computer to take the place of multiple computers, resulting in greater efficiency.

Virtualization Simplifies Computer Maintenance and Delivers High Performance

The process of virtualization works by inserting a thin layer of software called the hypervisor directly into the computer hardware. The hypervisor layer presents multiple sets of “virtual hardware,” which contain the same components as a regular machine (e.g., motherboard, chipset, etc.). To an operating system, virtual hardware is indistinguishable from a regular machine. … […]

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Instrumentation book

Instrumentation and Control Systems Documentation: Two generations of knowledge

When you read a book, do you ever consider the years of knowledge that lie behind the words? Collectively, the co-authors of Instrumentation and Control Systems Documentation, Second Edition bring 80-plus years’ worth of experience to each page. What’s even more unique is they are father and son. A dedicated ISA member for more than […]

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The Century’s Greatest Contributions to Control Practice

Introduction: Flowing with the tide of reflection and forecasting as the century changes, I took the liberty to conduct a survey of the century’s most important contributions to the practice of “control.’  I quite enjoyed considering the importance of the past events, and forecasting which contributions will be important in this new century. So did […]

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