Design of a tuned vibration neutraliser to control flexural waves on an infinite beam
Design of a tuned vibration neutraliser to control flexural waves on an infinite beam
The thesis presents a study into the design of a tuned vibration neutraliser to control flexural vibration on an infinite Euler-Bernoulli beam. Investigations include flexural wave control using a single tuned vibration neutraliser with different types of attachment. The types of attachment are such that the device exerts a force, a moment, a coupled force-moment and uncoupled force-moment on the beam. Simple analytical models are developed that facilitate physical interpretation and determination of key tuning parameters for design. The simulations have shown that attaching the neutraliser to exert a force does not attenuate the wave as effectively as when it is attached such that it exerts an uncoupled force-moment. A beam-like design of a force and an uncoupled force-moment type of neutraliser was manufactured and tested to validate the theoretical predictions.
Another way of improving the effectiveness of a tuned neutraliser to suppress waves over a wider frequency range, is to use an array of neutralisers. The neutralisers are of the beam-type, which each has a slightly different length to give closely spaced natural frequencies and hence multiple tuned frequencies. The simulations have shown that attaching the array of neutralisers to exert a force does not attenuate the wave as effective as when it is attached such that it exerts an uncoupled force-moment. This is partly explained by the fact that the neutraliser needs to exert a force and a moment independently on the infinite beam to be able to react to the shear force and the bending moment due to the flexural wave. Prototypes consisting of an array of four and two neutralisers were made and tested in the laboratory.
University of Southampton
2005
Salleh, Hanim
(2005)
Design of a tuned vibration neutraliser to control flexural waves on an infinite beam.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The thesis presents a study into the design of a tuned vibration neutraliser to control flexural vibration on an infinite Euler-Bernoulli beam. Investigations include flexural wave control using a single tuned vibration neutraliser with different types of attachment. The types of attachment are such that the device exerts a force, a moment, a coupled force-moment and uncoupled force-moment on the beam. Simple analytical models are developed that facilitate physical interpretation and determination of key tuning parameters for design. The simulations have shown that attaching the neutraliser to exert a force does not attenuate the wave as effectively as when it is attached such that it exerts an uncoupled force-moment. A beam-like design of a force and an uncoupled force-moment type of neutraliser was manufactured and tested to validate the theoretical predictions.
Another way of improving the effectiveness of a tuned neutraliser to suppress waves over a wider frequency range, is to use an array of neutralisers. The neutralisers are of the beam-type, which each has a slightly different length to give closely spaced natural frequencies and hence multiple tuned frequencies. The simulations have shown that attaching the array of neutralisers to exert a force does not attenuate the wave as effective as when it is attached such that it exerts an uncoupled force-moment. This is partly explained by the fact that the neutraliser needs to exert a force and a moment independently on the infinite beam to be able to react to the shear force and the bending moment due to the flexural wave. Prototypes consisting of an array of four and two neutralisers were made and tested in the laboratory.
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Published date: 2005
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Local EPrints ID: 465766
URI: http://eprints.soton.ac.uk/id/eprint/465766
PURE UUID: 7e82db1a-f7b4-42f2-9095-1d3c2a7b86a3
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Date deposited: 05 Jul 2022 02:54
Last modified: 05 Jul 2022 02:54
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Author:
Hanim Salleh
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