Past PID: Adaptive control is versatile, fast, accurate, report says

Microprocessors and advanced computing platforms have catalyzed the shift to adaptive controllers from proportional-integral-derivative (PID) controllers in process industries. Frost & Sullivan says adaptive control is gaining ground with improved performance in mechanical and nonmechanical systems. Links include....

04/08/2008


Palo Alto, CA – The advent of microprocessors and advanced computing platforms has catalyzed the shift to adaptive controllers from proportional-integral-derivative (PID) controllers in process industries. Continuous Adaptive Control – Technology Developments is a new analysis from Frost & Sullivan that reports adaptive control is being increasingly used because of its ability to improve performance in mechanical and nonmechanical systems.
In a Control Engineering article, “Techniques for Adaptive Control,” Vance VanDoren, consulting editor, says, “These latest control methodologies offer a means to revolutionize plant and process efficiency, response time, and profitability by allowing a process to be regulated by a form of rule-based artificial intelligence, without human intervention.” Also read “

Adaptive Controllers Work Smarter not Harder

” from Control Engineering .
Frost & Sullivan says adaptive controllers evolved from a solution for low-bandwidth applications to serve higher-bandwidth applications such as robots, spacecraft, and complex machining processes. Systems involving material, money, and supply and demand successfully incorporate adaptive controls. Missile control and guidance, fluid drive, industrial process control, power drag, firepower control system, ship navigation, and other nonlinear mechatronic systems now depend on this technology.
According to Frost & Sullivan research analyst S. Menaka, “While designing such complex and highly cognitive systems, developers need to be conscious of the time sensitivity of input and output data. Scientists will also have to consider other factors such as machine-human interface, ability to create cognitive solutions in a stipulated time, real-time performance control of the system, architecture independence, data normalization, and other such related factors.”
Due to time delays in operation or installation in systems with unknown dynamics, controllers were not traditionally used in mechanical systems. Following the advent of PID self-tuners, adaptive controllers became popular among commercial goods manufacturers and industry, Menaka says.
Offline training is imperative and scientists are compelled to consider the systems complexities. It was necessary that there be a trade-off among the error occurrences, correction identification, and steady performance of the system. Next-generation adaptive controllers use the model changes and the process output to compute the integrated square error (ISE) for each of three process parameters. After analysis of low, middle, and higher combinations of the parameters, 27 models can be devised, says Menaka.
“Through continued iterations, each model is normalized to a total ISE and the best value computed for each of the parameters is used in the next iteration as the middle value,” adds Menaka. “Thus, the model will undergo interpolation with re-centering of the parametric values to ultimately reach an optimum corrective model. As a high-end application, the control algorithm may also be embedded into an enterprise resource planning system. Eventually, scientists could develop a hybrid system comprising interacting subsystems.”
Future research will focus on other techniques, in addition to data analysis, inferential estimation, integration of neural network-based technologies into existing systems, and predictive control. There is a focus on developing new modeling methodologies; existing systems are under observation to integrate them with these. Emerging as an embedded technology, adaptive control will control higher-level functions. The control algorithm enhances the safety, economy, and reliability of the system and is responsible for its success or failure.
Continuous Adaptive Control– Technology Developments, part of the

Technical Insights subscription

, provides analysis of elements involved in the concept, PID controller, and tool path optimization software. It includes techniques of adaptive control such as model reference adaptive control, model free adaptive control, auto-tuning and self-tuning controllers, applications in domains, and trends. Technical Insights, an international technology analysis business, produces news alerts, newsletters, and research services.

Control Engineering News Desk
Register here and scroll down to select your choice of eNewsletters free .





No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2016 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
Each year, a panel of Control Engineering and Plant Engineering editors and industry expert judges select the System Integrator of the Year Award winners in three categories.
2017 Lubrication Guide; Software tools; Microgrids and energy strategies; Use robots effectively
Prescriptive maintenance; Hannover Messe 2017 recap; Reduce welding errors
Safety standards and electrical test instruments; Product of the Year winners; Easy and safe electrical design
Infrastructure for natural gas expansion; Artificial lift methods; Disruptive technology and fugitive gas emissions
Mobility as the means to offshore innovation; Preventing another Deepwater Horizon; ROVs as subsea robots; SCADA and the radio spectrum
Future of oil and gas projects; Reservoir models; The importance of SCADA to oil and gas
Diagnostic functions for system safety; Specifying industrial enclosures; Effective decision support for a crisis
Transformers; Electrical system design; Selecting and sizing transformers; Grounded and ungrounded system design, Paralleling generator systems
Natural gas for tomorrow's fleets; Colleges and universities moving to CHP; Power and steam and frozen foods

Annual Salary Survey

Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.

There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.

But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.

Read more: 2015 Salary Survey

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
The maintenance journey has been a long, slow trek for most manufacturers and has gone from preventive maintenance to predictive maintenance.
Featured articles highlight technologies that enable the Industrial Internet of Things, IIoT-related products and strategies to get data more easily to the user.
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.
Maintenance Manager; California Oils Corp.
Associate, Electrical Engineering; Wood Harbinger
Control Systems Engineer; Robert Bosch Corp.
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
click me