A Differential Pulse-Length Modulated Pneumatic Servo Utilizing Floating-Flapper-Disk Switching Valves

[+] Author and Article Information
S. R. Goldstein

Foster-Miller Associates, Inc., Waltham, Mass.

H. H. Richardson

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

J. Basic Eng 90(2), 143-151 (Jun 01, 1968) (9 pages) doi:10.1115/1.3605072 History: Received March 18, 1968; Online November 03, 2011


A novel approach to gas servo design is presented which provides closed-center operation while eliminating close clearance sliding seals and elastic members. Pulse-length modulated pressure waves having zero quiescent pulse width are used to actuate a new type of switching valve termed a “floating flapper disk.” Signal generation and modulation as well as power-level flow control are shown to be possible using this novel valve. System performance is discussed and compared with that of an equivalent linear servo. A prototype system fabricated to demonstrate feasibility is described. The valving concepts described are adaptable to digital, bang-bang, and optimally switched fluid control systems.

Copyright © 1968 by ASME
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