April 2009
Intermediate to advanced
352 pages
8h 52m
English
Content preview from Process Identification and PID ControlBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
12
Relay Feedback Methods
In this chapter, the conventional relay feedback method is first introduced. It is the simplest and has been the most widely used in industry for a long time. In particular, it is one of the most important process activation methods for automatic tuning of a PID controller. Next, three important relay feedback methods recently developed to overcome the several problems of the conventional relay feedback methods are introduced. The first method activates the process with a guarantee of a symmetric oscillation under the circumstance of disturbances so that the describing function analysis method provides accurate frequency response data of the process. The second method can guarantee a symmetric oscillation under the circumstance of disturbances and nonlinearity. The third method can provide estimates for the frequency responses for which the phase angle is specified a priori and also manipulate a large range of operation, possibly larger than the magnitude of the relay.
12.1 Conventional Relay Feedback Methods
The conventional relay feedback method was proposed by Åström and Hägglund (1984). It is the simplest among the various versions of relay feedback methods. Two types are available, according to the actual operations: unbiased relay and biased relay.
12.1.1 Unbiased-Relay Feedback Method
Chapter 8 in Part Three briefly explained how to activate a process using the unbiased-relay feedback method, and the MATLAB code for its implementation was introduced. ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.