Analysis of Pneumatic Controllers

[+] Author and Article Information
E. C. Hind, W. Dollar

School of Mechanical Engineering, The University of New South Wales, New South Wales, Australia

J. Basic Eng 88(2), 287-294 (Jun 01, 1966) (8 pages) doi:10.1115/1.3645849 History: Received July 20, 1964; Online September 19, 2011


The concept of hydraulic capacitance is applied to pneumatic bellows assemblies. This concept is then used in the analysis of a number of different basic types of pneumatic controllers in common use. Its application allows the effect of the bellows system used for delaying the derivative action, and the effect of bellows movement generally, to be conveniently included in the analyses. Numerical values determined for a particular controller show that the effect of bellows movement can change the transfer function constants by as much as 20 percent.

Copyright © 1966 by ASME
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