Quasi-optimization of relay servomechanisms.
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Authors
McDonald, Carlton Angus Klump
Subjects
Advisors
Date of Issue
1957
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
The DC shunt motor relay servomechanism offers a great deal of promise from the standpoint of a fast, inexpensive, accurate control system. The author has endeavored to develop means of improving the response characteristics of this type of control system. From investigations conducted at the Naval Postgraduate School, Monterey, California, it is the opinion of the author that a linear switching criteria, produced by a combination of error and error rate feedback, would prove highly desirable from the standpoint of cost, weight, and simplicity of design,, If derivative feedback were to be combined with discontinuous damping in the dead zone provided by dynamic braking, it is indeed possible that a high degree of static accuracy may result. Investigations tend to show that the static accuracy, using this system, is dependent upon (l) the gear ratio between the motor and the error detector (2) the ratio of armature inductance to armature resistance of the motor (3) the ratio of coulomb friction to inertia of the motor load combination and (4) the delay time of the relay. Preliminary calculations and computer studies on the use of an inductance and a resistance in a circuit in parallel with the motor armature tend to show that this form of dynamic braking would be of considerable value in improving the characteristics. Indeed, it is possible that this type of system would produce response characteristics that would be comparable to if not surpass the optimum relay servomechanism.
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Thesis
Description
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Department
Electrical Engineering