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An investigation of hydraulic-line resonance and its attenuationAn investigation of fluid resonance in high-pressure hydraulic lines has been made with two types of fluid dampers (or filters) installed in the line. One type involved the use of one or more closed-end tubes branching at right angles from a main line, and the other type was a fluid muffler installed in-line. These devices were evaluated in forced vibration tests with oscillatory disturbances over a 1000-Hz range applied to one end of the line and with oscillatory pressures measured at various stations along the main pipe. Limited applications of acoustic-wave theory to the branched systems are also included. Results show varying attenuations of pressure perturbations, depending on the number and location of branches and the type of muffler. Up to three branches were used in the branch-resonator study, and the largest frequency range with maximum attenuation was obtained for a three-branch configuration. The widest frequency ranges with significant attenuations were obtained with two types of fluid mufflers.
Document ID
19740004441
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Sewall, J. L. (NASA Langley Research Center Hampton, VA, United States)
Wineman, D. A. (NASA Langley Research Center Hampton, VA, United States)
Herr, R. W. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
December 1, 1973
Subject Category
Structural Mechanics
Report/Patent Number
NASA-TM-X-2787
L-8738
Accession Number
74N12554
Funding Number(s)
PROJECT: RTOP 501-22-05-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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