Active control of vibration in aircraft and inside the ear (Plenary Lecture)
Active control of vibration in aircraft and inside the ear (Plenary Lecture)
The current state of the art for active sound and vibration control in aircraft is first reviewed,
particularly the use of arrays of shakers to control the internal sound inside aircraft. Current research
trends in this area are then discussed, focusing on the use of many locally-acting modular controllers
to reduce the global vibration in large structures. Such modules would contain a single actuator,
sensor and controller, together with a self-tuning element to adapt the controller to the environment it
finds itself in. If the actuator and sensor are collocated and dual, the global performance of an array of
locally acting controllers can be almost as good as a fully centralised controller, but without the design
and communication problems. The use of inertial shakers as practical actuators in such systems is
considered, together with the stability problems associated with using these devices in local feedback
loops. The action of the cochlear amplifier within the inner ear is then discussed in terms of the
control of the global vibration behaviour through the action of a large array of locally acting feedback
systems, with actuation provided by the outer hair cells in this case. The cochlear amplifier enhances
the vibration within the inner ear, by 40-50 dB, greatly improving the sensitivity and selectivity of our
hearing. The changes in the basilar membrane dynamics required to amplify a wave propagating
along the cochlear are described, and the way in which these changes are achieved is discussed for
various micromechanical models of the organ of Corti. It is seen that the kind of lumped parameter
model used to understand the action of a feedback loop in the case of an inertial actuator used to
attenuate the vibration in engineering structures, can also be used to describe the dynamics of the
basilar membrane under feedback control, which amplifies the vibration in the inner ear
Elliott, Stephen J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
20 August 2009
Elliott, Stephen J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Elliott, Stephen J.
(2009)
Active control of vibration in aircraft and inside the ear (Plenary Lecture).
International Symposium on Active Control of Sound and Vibration (ACTIVE) Conference 2009, Ottawa, Canada.
19 - 21 Aug 2009.
25 pp
.
Record type:
Conference or Workshop Item
(Other)
Abstract
The current state of the art for active sound and vibration control in aircraft is first reviewed,
particularly the use of arrays of shakers to control the internal sound inside aircraft. Current research
trends in this area are then discussed, focusing on the use of many locally-acting modular controllers
to reduce the global vibration in large structures. Such modules would contain a single actuator,
sensor and controller, together with a self-tuning element to adapt the controller to the environment it
finds itself in. If the actuator and sensor are collocated and dual, the global performance of an array of
locally acting controllers can be almost as good as a fully centralised controller, but without the design
and communication problems. The use of inertial shakers as practical actuators in such systems is
considered, together with the stability problems associated with using these devices in local feedback
loops. The action of the cochlear amplifier within the inner ear is then discussed in terms of the
control of the global vibration behaviour through the action of a large array of locally acting feedback
systems, with actuation provided by the outer hair cells in this case. The cochlear amplifier enhances
the vibration within the inner ear, by 40-50 dB, greatly improving the sensitivity and selectivity of our
hearing. The changes in the basilar membrane dynamics required to amplify a wave propagating
along the cochlear are described, and the way in which these changes are achieved is discussed for
various micromechanical models of the organ of Corti. It is seen that the kind of lumped parameter
model used to understand the action of a feedback loop in the case of an inertial actuator used to
attenuate the vibration in engineering structures, can also be used to describe the dynamics of the
basilar membrane under feedback control, which amplifies the vibration in the inner ear
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Published date: 20 August 2009
Venue - Dates:
International Symposium on Active Control of Sound and Vibration (ACTIVE) Conference 2009, Ottawa, Canada, 2009-08-19 - 2009-08-21
Identifiers
Local EPrints ID: 79026
URI: http://eprints.soton.ac.uk/id/eprint/79026
PURE UUID: 8d3580bc-01d8-48ee-a6a6-f6aa9309cf87
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Date deposited: 18 Mar 2010
Last modified: 10 Dec 2021 17:31
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