Dynamics of a Proportional Fluidic Amplifier: Part 2

[+] Author and Article Information
F. T. Brown

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Mass.

R. A. Humphrey

Shell Development Company, Emeryville, Calif.

J. Basic Eng 92(2), 312-321 (Jun 01, 1970) (10 pages) doi:10.1115/1.3424995 History: Received July 14, 1969; Online October 27, 2010


A sixth-order lumped model is formed to represent the internal behavior of the fluidic amplifier tested in Part 1 up to over 800 Hz. Correlation with experiment is good for zero-load pressure, but an observed resonance or instability at elevated-load pressures is not properly predicted. Flow-visualization experiments are described from which four possible mechanisms are proposed for such resonances and instabilities observed in this and similar amplifiers. The study can be used to explain the successes of various design innovations tried earlier by others, to suggest further changes and associated performance limits, and to guide further needed research.

Copyright © 1970 by ASME
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