Fig. 1. Schematic of test system ~HP5high pressure, LP5low pressure!

Modeling supply and return line dynamics for an electrohydraulic actuation system

Abstract: This paper presents a model of an electrohydraulic fatigue testing system that emphasizes components upstream of the servovalve and actuator. Experiments showed that there are significant supply and return pressure fluctuations at the respective ports of the servovalve. The model presented allows prediction of these fluctuations in the time domain in a modular manner. […]

Print Friendly
Continue Reading · 0
Taking Notes

ISA Training and Education in July: Learn, Advance, Succeed

In July ISA TechTour, the newest traveling technical training program that brings ISA’s expert trainers and premier instructional resources straight to you, comes to Oklahoma. The month also features the Training Short Course Special Event, featuring 20 short automation and control courses at ISA’s North Carolina headquarters, from 29 July through 2 August.  You can […]

Print Friendly
Continue Reading · 0
Waste Water system

Big Data Focus at 2013 ISA Water/Wastewater Symposium

Big Data is Big News in just about every corner of our digitally connected world.  Leveraging massive amounts of process data archives is a game changer for practically any industrial process, enabling greater levels of agility, efficiency and competitiveness.  This year’s 2013 ISA Water/Wastewater and Automatic Controls Symposium will deliver the most current information on […]

Print Friendly
Continue Reading · 0
Slider_Six steps to control system cybersecurity

Six Steps to Control System Cybersecurity

If you are like most process automation professionals, you are aware that your automation systems are not as secure as they should be, and you would like to make improvements. But you are somewhat confused by all the industry chatter regarding security and standards, and you are looking for a clear path toward improvement, minus […]

Print Friendly
Continue Reading · 0
Auto Shop

Technical Expertise Across Multiple Platforms: What the Auto Dealership Taught Me the Hard Way

Several years ago, my family owned a Honda and a Chevy.  When we initially bought our cars, we took them to the respective dealers for routine maintenance and service.  It seemed like the obvious thing to do in this era of high-tech automobiles, since they should know their cars best.  However, after a while I […]

Print Friendly
Continue Reading · 0
101 Tips for a Successful Automation Career

Tip #22 Details Matter

I was working on a large automation retrofit project of a chemical plant that had numerous thermocouples scattered throughout the structures. A vendor suggested a particular thermocouple card that I had never used, and I was about to proceed with that card when I decided to quickly scan the specs on the card. There was […]

Print Friendly
Continue Reading · 0
Fig. 1. Conceptual configuration of the GLC controller.

Design of controller using variable transformations for a nonlinear process with dead time

Abstract: In this work, a globally linearized controller (GLC) for a first-order nonlinear system with dead time is proposed. This is similar to the GLC proposed by Ogunnalke [Ind. Eng. Chem. Process. Des. Dev. 25, 241–248 (1986)] for nonlinear systems without dead time. Two methods are proposed. One is based on the Smith prediction from […]

Print Friendly
Continue Reading · 0