Thomas, Terence Haydn (1971) Pulse frequency techniques for automatic control. PhD thesis, University of Warwick.

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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:	Date Event 1971 Submitted
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Publication Status:	Unpublished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

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