
The Library
Pulse frequency techniques for automatic control
Tools
Thomas, Terence Haydn (1971) Pulse frequency techniques for automatic control. PhD thesis, University of Warwick.
|
PDF
WRAP_Thesis_Thomas_1971.pdf - Requires a PDF viewer. Download (112Mb) | Preview |
Official URL: http://webcat.warwick.ac.uk/record=b1733641~S1
Abstract
This thesis describes an investigation into the suitability of pulse frequency modulation (PFM) as a standard form of signal for representing quantities in process control. The encoding and decoding of PFM signals into both analogue and digital forms is examined in some detail. PFM is shown to be well suited for high accuracy telemetry at moderate cost, provided ample channel band-width is available. The processing of the information in PFM signals by means of binary logic devices is treated systematically. Functional building blocks are identified, and shown to be capable of performing all the basic algebraic and differential operations needed for control.
The thesis concludes with an examination of applications and a discussion of PFM transducers, actuators and hierarchical control schemes. The performance constraints of two different process controllers are identified. Both controllers show ‘P+I’ action; one works continuously, the other has a cyclic action; both employ PFM techniques. They are shown to offer dynamic responses similar to those of conventional analogue controllers, in conjunction with high accuracy (e. g. errors less than ½%), computer compatibility and the facility for digital display.
Item Type: | Thesis (PhD) | ||||
---|---|---|---|---|---|
Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||
Library of Congress Subject Headings (LCSH): | Pulse frequency modulation, Telemeter, Automatic control | ||||
Official Date: | 1971 | ||||
Dates: |
|
||||
Institution: | University of Warwick | ||||
Theses Department: | School of Engineering | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Douce, J.L. , Hughes, M.T.G. | ||||
Sponsors: | Serck Limited , Courtaulds Educational Trust | ||||
Extent: | 255 leaves : illustrations | ||||
Language: | eng |
Request changes or add full text files to a record
Repository staff actions (login required)
![]() |
View Item |
Downloads
Downloads per month over past year