The effect of cubic damping on a base excited isolator: an experimental study for harmonic excitation
The effect of cubic damping on a base excited isolator: an experimental study for harmonic excitation
An experimental study has been conducted to validate theoretical solutions for the response of a base excited single degree-of-freedom isolation system possessing pure cubic damping. The cubic damping characteristic was implemented using an electromagnetic shaker with a simple non-linear velocity feedback control. The rig and practical implementation of the active damping are described. The base excitation was harmonic at a set of discrete frequencies with constant displacement amplitude. Consistent with theoretical predictions, the isolation performance at high excitation frequencies is shown to be worse than either the undamped or linear viscously damped isolation system with the displacement transmissibility tending to unity. This is contrary to the case of force excitation reported in the literature where cubic damping offers improved performance. The physical causes of the distinct behaviours and the consequences for isolator design are discussed
Panananda, N.
f08b5155-6329-483e-8522-d4559c4a918c
Ferguson, N.S.
8cb67e30-48e2-491c-9390-d444fa786ac8
Waters, T.P.
348d22f5-dba1-4384-87ac-04fe5d603c2f
2 July 2013
Panananda, N.
f08b5155-6329-483e-8522-d4559c4a918c
Ferguson, N.S.
8cb67e30-48e2-491c-9390-d444fa786ac8
Waters, T.P.
348d22f5-dba1-4384-87ac-04fe5d603c2f
Panananda, N., Ferguson, N.S. and Waters, T.P.
(2013)
The effect of cubic damping on a base excited isolator: an experimental study for harmonic excitation.
11th International Conference on Recent Advances in Structural Dynamics (RASD 2013), Pisa, Italy.
01 - 03 Jul 2013.
13 pp
.
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Conference or Workshop Item
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Abstract
An experimental study has been conducted to validate theoretical solutions for the response of a base excited single degree-of-freedom isolation system possessing pure cubic damping. The cubic damping characteristic was implemented using an electromagnetic shaker with a simple non-linear velocity feedback control. The rig and practical implementation of the active damping are described. The base excitation was harmonic at a set of discrete frequencies with constant displacement amplitude. Consistent with theoretical predictions, the isolation performance at high excitation frequencies is shown to be worse than either the undamped or linear viscously damped isolation system with the displacement transmissibility tending to unity. This is contrary to the case of force excitation reported in the literature where cubic damping offers improved performance. The physical causes of the distinct behaviours and the consequences for isolator design are discussed
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Published date: 2 July 2013
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11th International Conference on Recent Advances in Structural Dynamics (RASD 2013), Pisa, Italy, 2013-07-01 - 2013-07-03
Organisations:
Dynamics Group
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Local EPrints ID: 355360
URI: http://eprints.soton.ac.uk/id/eprint/355360
PURE UUID: 141587da-49a5-407b-b36a-b230b1005772
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Date deposited: 09 Aug 2013 14:06
Last modified: 15 Mar 2024 02:34
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Author:
N. Panananda
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