الفهرس 
Transfer functionsOnly 14 pages are availabe for public view
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Abstract
The thesis applies the graphical method for the
determination of the frequency response of a closed loop
servomechanism including two nonlinear elements in series.
The describing functions of the nonlinear elements depend
on both frequency and amplitude of their anputs.
One of the problems considered is a push-pull magnetic
amplifier and a two-phase servomotor connected in series.
Other problem is ideal saturated amplifier and the same
two-phase servomotor. The third problem is a two-phase
servomotor coupled to a gear train containing backlash.
A new method is developed to represent th~ saturation curve
by condsidering it to be composed of ”n” number of straight
line segments and the describing function of the saturation
curve of the ~agnetic amplifterhas been derived and applied
to the systems mentioned above.
Phase plane techniques have been also used to study the
stability and transient response of the system containing
a linear amplifier and a two phase servomotor whose
characteristics are nonlinear.
The thesis includes experimental results on addition
to analytical results obtained by a digital computer programs
based on the graphical method.
A reasonable coUicidence of the results obtained
analytically from digital computer program and the graphical
method was achieved.
It is concluded that the frequency reEponse, of a closed
loop system having two nonlinear elements, is obtained
easier and more accurate using the describing functions
which are developed in this thesis.