A technique is presented for obtaining high resolution root locus plots and Bode diagrams. This is done by translating the origin of coordinates to the area of interest by an appropriate change of variable. The method is applicable to hand calculations or use of a potential analog computer. Examples include...
Theoretical bases and techniques are discussed in this
paper for practical numerical analysis and synthesis of linear
feedback control systems. Criterion are based on the superposition
integrals.
A synthesis method is introduced to find the impulse response
of a system or a part of the system. The existing system
can...
This is a report describing the limitations of optical character
recognition using the mask-matching principle. Conclusions
are supported by the results of an experimental system built for
the purpose of reduction to practice.
Formulas are derived describing the limitations of a mask-matching system. Given desired character reading speed, a specified...
A rheostat is an adjustable resistor so constructed that its resistance may be changed without opening the circuit in which it may be connected. Conventional rheostats are adjusted mechanically. This thesis presents a method of adjusting resistance electrically by varying the light intensity incident on the surface of a photoconductive...
A multivariable model describing the system response
(weld tensile strength of 6061-T6 aluminum) of a percussive
stud welding system as a function of five natural
(external) system variables was developed. The five natural
system variables were 1) static weight of the drop-shaft (W), 2) initial stud base height (H₀), 3)...
Certain fluids exhibit an increase in flow resistance when subjected to an electric field. This electroviscous response, known as the
Winslow effect, has been the basis for development of a unique control
medium. Applying a strong potential across the fluid causes it to
"stiffen", even to the point of ceasing...
The relationships of the variables of a process to be controlled
are expressed in a mathematical model of the process. In the
case of the rolling of metal the process is described by the physics
of the deformation of the metal in the roll gap. In developing the
theory of...
Phase-space trajectories are often used to describe a system's
stability or response characteristics. It is desirable to observe such
a phase-space trajectory directly from an analog simulation of a
system, but a conventional oscilloscope display does not provide an
axis for the third variable,
A third axis could be provided...
For many applications it is desirable to be able to experimentally determine the impulse response of a linear system while it is in operation. Use of correlation techniques allows this to be done
without noticeably disturbing the quiescent output value of the system.
An impulse response measurement apparatus is designed...
The model-reference, adaptive control concept is based on the
precept that desired control system performance is a known design
requirement and can be obtained from a representative model. Control
system parameters are adjusted by the adaptive controller through a
minimizing operation on a function of the error (i.e., performance
index)...