Feedback theory and its applications

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APPLIED PHYSICS GUIDES
Also in this series
TECHNOLOGY OF INSTRUMENTATION
BY
ERIC B. PEARSON
M.Sc., F.Inst.P., M.I.E.E., A.F.R.Ae.S.
Associate Professor of Engineering Physics, Royal Military College of Science, Shrivenham. '
Although many books have been written during the past few years on aspects of instrumentation, particularly automatic control and computing, the majority are too specialised for students taking a first course in the subject,-and also even for new graduates who are taking up their initial appointment^ in industry or one of the technical branches of the Services, and this book has been written expressly for them.
The early chapters deal with the basic principles of ^ measurement by means of an instrument with moving parts and show how its dynamic and static accuracy is determined by certain parameters in the system. Classical methods are used for the solutions of the relevant differential equations of motion. These appear again in the study V of simple... Tovább

Fülszöveg

APPLIED PHYSICS GUIDES
Also in this series
TECHNOLOGY OF INSTRUMENTATION
BY
ERIC B. PEARSON
M.Sc., F.Inst.P., M.I.E.E., A.F.R.Ae.S.
Associate Professor of Engineering Physics, Royal Military College of Science, Shrivenham. '
Although many books have been written during the past few years on aspects of instrumentation, particularly automatic control and computing, the majority are too specialised for students taking a first course in the subject,-and also even for new graduates who are taking up their initial appointment^ in industry or one of the technical branches of the Services, and this book has been written expressly for them.
The early chapters deal with the basic principles of ^ measurement by means of an instrument with moving parts and show how its dynamic and static accuracy is determined by certain parameters in the system. Classical methods are used for the solutions of the relevant differential equations of motion. These appear again in the study V of simple servomechanisms used for remote position control and methods which can be used to improve their performance are dealt with theoretically and practically.
v
net
r-p-\HE AIM of this book is to pient well-
I tried methods of linear and Kon-lmear
i feedback system analysis and tj illustrate their application to a variety of dgineenng devices which incorporate feedbacliin some form. The book is intended for poiigraduate engineering and physics students ajj others who require an introduction to the sifcject and a view of its scope and future. Some ^iliarity with the Laplace or Heaviside Durational method is assumed.
Linear feedback theory is introdjced by starting from the differential equation olmotion of a system and proceeding via the Laplace transformation to a flow diagram repregntation in operational form. After a discussion of the properties conferred by feedback and, particularly, by negative feedback, the quesion of stability is considered and the Nyquist cSiterion is derived. Applications of the theory tocertain electronic circuits are then described, palficular attention being paid to the d.c. coupled Hrtual earth amplifier and its use as an anlogue computer element. The synthesis of staUising networks is illustrated by the use of pha -gain characteristics.
Servomechanisms and other control sjtems are introduced using linear theory andlwith examples from hydraulic and electrical irvo-mechanism practice. Linear theory is shoin to be inadequate to explain behaviour in kany applications and two chapters are devoto to non-linear analytical techniques using mase plane constructions and describing fun ion methods respectively. These techniques are illustrated by a study of the behaviour o an electrical position controller with inherent bn-linearities. A separate chapter is devotea to control systems employing on-off elements ach as relays; the properties of on-off controls are discussed by means of phase plane nd describing function methods and the optimU-tion of the transient response is considered. |
In the final chapter is discussed the importiit subject of electronic analogue simulators for Be study of control systems with non-linVr parameters. A design technique is illustrated y consideration of a marine autopilot with a fll description of the steps necessary to convit the autopilot flow diagram into a simulatt circuit diagram. Vissza