DESIGN OF DIGITAL CONTROL ALGORITHMS USING TIME DOMAIN SPECIFICATIONS.
Abstract
Design techniques for control systems generally fall into two categories: (1) frequency ddomain techniques and (2) time domain techniques. Frequency domain techniques have never been widely used by process engineers, perhaps because frequency response data for operating plants is seldom readily available. Thus, they have turned to time domain techniques. These approaches can be divided into two categories vased on chosen performance criteria: (1) use of integral criteria such as ISE, IAE, ITAE, etc., and (2) use of specification such as rise time, settling time, decay ratio, damping ratio, percent overshoot, etc. The integral criteria have the advantage that they offer a more consistent characterization of the response, whereas the latter type of specifications has the advantage of being more directly meaningful to process engineers. The objective of this report is to present a technique by which a digital control algorithm can be designed using these directly meaningful criteria. This approach is the application of a well-known design technique in sample-data theory to the first-order-lag-plus-dead-time model commonly used by process engineers for controller tuning. This procedure will be developed by first characterizing the process with a model and then determining the applicable control algorithm. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1969
- Accession Number
- AD0688793
Entities
People
- Cecil L. Smith
- Leonard P. Neumann
- Paul W. Murrill
Organizations
- Louisiana State University