industrial laser with sparks flying around

How to Use Plant-Wide Feedforward for More Flexible and Efficient Production

The pressure to reduce inventories, coupled with changing market demands and fluctuations in raw material and energy prices, requires a process plant to be able to respond quickly to maintain optimum operation. To most efficiently support changes in production rate or product grade, flows must change in unison throughout the plant. Feedback loops cannot do […]

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Engineering Factory

Piecewise Controller Design for Affine Fuzzy Systems

Abstract: This paper studies the problem of state feedback controller design for a class of nonlinear systems, which are described by continuous-time affine fuzzy models. A convex piecewise affine controller design method is proposed based on a new dilated linear matrix inequality (LMI) characterization, where the system matrix is separated from Lyapunov matrix such that […]

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ND-2013-Spec-Sect-reference_recorder_screenshot

Reference Recorders Shake Up Old Standards

Within the pressure measurement industry, relentless innovation has become the norm. New technology continually supplants the old. In other technology spheres, PCs pushed aside typewriters. Cell phones drove out telephones. And today, reference recorders are shaking up old standards in the oil and gas industry. A reference recorder is a new class of instrument that […]

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Man-Machine

Next Frontier for the Operator-Automation Relationship

Industrial control systems are complex designs, but they do not give much consideration to the needs of the human operator. This oversight has caused serious and costly accidents. By empowering operators with the right human-automation relationship tools, companies will achieve and exceed their goals. Unprecedented prosperity The world population is more prosperous today than ever […]

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Factory control room

What are the Benefits of Identifying Deadtime and Ramp Rate

In Tip #70, we learned that deadtime was the key to loop performance. The Control Talk blog The ABCs of Controller Tuning describes how tuning settings can be reduced to a simple function of deadtime. The InTech article PID Tuning Rules and the article’s online appendices describe the fundamental relationships between deadtime, performance, and tuning. […]

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Amit Ajmeri

Field Wireless Networks: ISA100 and Other Wireless Technologies Making Inroads

Industrial wireless devices and networks are used for measurement and control applications in areas of process plants where it is too difficult or too expensive to hardwire sensors, transmitters, and final control elements. They are also used for temporary applications, such as in research and development and pilot plants. Although most consumer wireless networks are […]

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paper industry

Robust Control Strategies for an Electric Motor Driven Accumulator with Elastic Webs

Abstract: This paper concerns the modeling of an accumulator used in industrial elastic web processing plant to allow changing material roll while the rest of the line remains at a constant web velocity. A nonlinear model of a motor actuated accumulator is first summarized. This model is derived from the physical relationships describing web tension and […]

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