An analytical model for the static and dynamic behavior of plenum-type air cushion suspensions, including compressor and feeding duct interactions, is developed and experimentally verified. Conditions for cushion instability (flutter) are identified and stable and unstable operation is demonstrated both analytically and experimentally. Step response tests conducted by dropping experimental scale model suspensions from heights up to 1.75 times the equilibrium hover height show that a linearized model accurately predicts the experimental response, including sprung and unsprung mass natural frequencies and damping ratios. Criteria are given for selection of low-order dynamic models, based on product expansions, for the distributed parameter feeding duct. It is shown that cushion-duct dynamic interactions may strongly affect cushion stability unless the lowest duct resonant frequency is substantially higher than the suspension sprung and unsprung mass natural frequencies.
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September 1975
Research Papers
Plenum Air Cushion/Compressor-Duct Dynamic Interactions
L. M. Sweet,
L. M. Sweet
Department of Aerospace and Mechanical Sciences, Princeton University, Princeton, N. J.
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H. H. Richardson,
H. H. Richardson
Department of Mechanical Engineering, M.I.T., Cambridge, Mass.
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D. N. Wormley
D. N. Wormley
Department of Mechanical Engineering, M.I.T., Cambridge, Mass.
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L. M. Sweet
Department of Aerospace and Mechanical Sciences, Princeton University, Princeton, N. J.
H. H. Richardson
Department of Mechanical Engineering, M.I.T., Cambridge, Mass.
D. N. Wormley
Department of Mechanical Engineering, M.I.T., Cambridge, Mass.
J. Dyn. Sys., Meas., Control. Sep 1975, 97(3): 283-292 (10 pages)
Published Online: September 1, 1975
Article history
Received:
April 28, 1975
Online:
July 13, 2010
Citation
Sweet, L. M., Richardson, H. H., and Wormley, D. N. (September 1, 1975). "Plenum Air Cushion/Compressor-Duct Dynamic Interactions." ASME. J. Dyn. Sys., Meas., Control. September 1975; 97(3): 283–292. https://doi.org/10.1115/1.3426934
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