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Transient effects of supply and connecting conduits in hydraulic control systems

✍ Scribed by S.S.L. Chang

Publisher
Elsevier Science
Year
1956
Tongue
English
Weight
732 KB
Volume
262
Category
Article
ISSN
0016-0032

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✦ Synopsis

Basic equations for transient flow of a slightly compressible fluid in a metal tubing are derived for both laminar and turbulent flow. Applying the equations to hydraulic control systems, it is shown (1) that the saturation limit of a valve controlled servomotor supplied by a conduit of length I is considerably lower than its steady state value during the first 21/c second following a step input, and (2) that the effects of connecting conduits in displacement controlled systems are to cause a dead time of l/c second and to produce undesirable pressure echoes which can be eliminated by properly matching the conduits to the system as shown in the paper. The wave speed C is approximately 5000 feet per second depending on the parameters.

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