| Summary: | A pneumatic, pure fluid oontrol system, capable of maintaining
the angular position of an inertia load in a gravitational
space, using only one moving part, was designed and
built. The control system consisted of a vortex-sink angular
rate sensor, a pendulum controlled flapper-nozzle angular position
sensor, a summing amplifier and bistable reaction jets.
The system was designed to operate in a bang- bang manner in
order to reduce errors in a minimum amount of time. A previous author's work on the vortex-sink angular rate
sensor is extended to include information and data on proportional
amplification of the output signal and the frequency
response of the sensor. Methods for synthesizing the components
into a working system are presented along with a theoretical
analysis of the system's performance. Results of experiments performed on the completed system
showed that the reaotion jets could be switched in a nearly optimal
manner when responding to errors introduced on one side
of the system, but, due to the unsymmetrical gain of the rate
sensor, the errors introduced on the opposite side resulted in
a certain amount of after end-point chattering. Good correlation between theory and experiment led to the
conclusion that the application of standard control system design
techniques can be readily applied to the design of pure fluid control
systems.
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