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Automation industry articles from ISA

Modified-Smith-Predictor-Based-Cascade-Control

Modified Smith Predictor-Based Cascade Control of Unstable Time Delay Processes

  Abstract: An improved cascade control structure with a modified Smith predictor is proposed for controlling open-loop unstable time delay processes. The proposed structure has three controllers of which one is meant for servo response and the other two are for regulatory responses. An analytical design method is derived for the two disturbance rejection controllers by […]

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Improve-Industrial-Productivity-with-Loop-Calibration

How to Improve Industrial Productivity with Loop Calibration

The typical approach to calibration has been to regularly test instrumentation that affects successful control, safe operation, quality, or other relevant criteria. In most cases, scheduling is conservative, and methods at a particular site have evolved over time. Instrument technicians follow practices that were set up many years ago. It is not uncommon to hear, […]

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Simulation-Stability-Analysis-Neural-Network-Based-Control

Simulation and Stability Analysis of Neural Network Based Control Scheme for Switched Linear Systems

Abstract: This paper proposes a new adaptive neural network based control scheme for switched linear systems with parametric uncertainty and external disturbance. A key feature of this scheme is that the prior information of the possible upper bound of the uncertainty is not required. A feedforward neural network is employed to learn this upper bound. The […]

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Next-generation-process-automation-wireless-technology

What Is the Next Generation of Process Automation Wireless Technology?

Wireless technology is an essential business enabler for the automation world. It has gained rapid acceptance in many industrial sectors because of its cost effectiveness, reliability, fast deployment, and flexibility. Over the past four decades, ultrahigh frequency (UHF) radios have been widely used for long-range supervisory control and data acquisition (SCADA) connectivity in the oil […]

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Automation-Competency-Model-Helps-Guide-Future-Technical-Workforce

Automation Competency Model Helps Guide Future Technical Workforce

In 2007, the Automation Federation (AF) delegation told an audience at the Employment and Training Administration (ETA) about the people practicing automation careers in industry. Not long before our visit, the ETA, part of the U.S. Department of Labor (DOL), had worked with the National Institute of Standards and Technology (NIST) to develop a “competency […]

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Pervasive-Sensing-Reduces-Costs-Prevents-Downtime

Industrial Pervasive Sensing Reduces Costs and Prevents Downtime

There has never been a greater need for plant reliability and energy efficiency. Both depend upon actionable information: plant operators need to know what is happening everywhere in the plant, often in close to real time. This was seldom done in the past, mainly for cost reasons. However, the availability of innovative sensors (many of […]

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DC-Servomechanism-Parameter-Identification-Closed-Loop-Approach

DC Servomechanism Parameter Identification: Closed-Loop Approach

  Abstract: This paper presents a Closed Loop Input Error (CLIE) approach for on-line parametric estimation of a continuous-time model of a DC servomechanism functioning in closed loop. A standard Proportional Derivative (PD) position controller stabilizes the loop without requiring knowledge on the servomechanism parameters. The analysis of the identification algorithm takes into account the control […]

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