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Nonlinear vibrations of a stroke-saturated inertial actuator

Nonlinear vibrations of a stroke-saturated inertial actuator
Nonlinear vibrations of a stroke-saturated inertial actuator
Proof-mass actuators are typically used to supply an external control force to a structure,for the purpose of vibration suppression. These devices comprise a proof-mass suspended in a magnetic field that is accelerated in order to provide a reaction force on the actuator casing and the structure itself. If the actuator stroke length is reached or exceeded, the proof-mass will hit the end stops, resulting in a nonlinear phenomenon known as stroke saturation. In this paper, a theoretical and experimental investigation into the actuator’s dynamical behaviour is undertaken. First, the blocked inertial force of the actuator in response to an input voltage was measured experimentally using a variety of excitation amplitudes and frequencies. An analysis was conducted in the time- and frequency-domains, and the first-order force-voltage FRF of the actuator was ascertained for each excitation amplitude. The information provided by the analysis was then used to estimate the parameters for a linear piecewise stiffness model of the actuator, in order to simulate the time-domain response. Finally, a comparison of the simulated and measured signals is conducted to establish the accuracy of the model.
nonlinear dynamics, actuators, stroke saturation
Wilmshurst, L.I.
860987a9-1511-4938-a805-ca7f33511e58
Ghandchi Tehrani, M.
c2251e5b-a029-46e2-b585-422120a7bc44
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Wilmshurst, L.I.
860987a9-1511-4938-a805-ca7f33511e58
Ghandchi Tehrani, M.
c2251e5b-a029-46e2-b585-422120a7bc44
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567

Wilmshurst, L.I., Ghandchi Tehrani, M. and Elliott, S.J. (2013) Nonlinear vibrations of a stroke-saturated inertial actuator. RASD2013. 01 - 03 Jul 2013. 13 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Proof-mass actuators are typically used to supply an external control force to a structure,for the purpose of vibration suppression. These devices comprise a proof-mass suspended in a magnetic field that is accelerated in order to provide a reaction force on the actuator casing and the structure itself. If the actuator stroke length is reached or exceeded, the proof-mass will hit the end stops, resulting in a nonlinear phenomenon known as stroke saturation. In this paper, a theoretical and experimental investigation into the actuator’s dynamical behaviour is undertaken. First, the blocked inertial force of the actuator in response to an input voltage was measured experimentally using a variety of excitation amplitudes and frequencies. An analysis was conducted in the time- and frequency-domains, and the first-order force-voltage FRF of the actuator was ascertained for each excitation amplitude. The information provided by the analysis was then used to estimate the parameters for a linear piecewise stiffness model of the actuator, in order to simulate the time-domain response. Finally, a comparison of the simulated and measured signals is conducted to establish the accuracy of the model.

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RASD2013 Paper (LW, MGT, SE) 2.pdf - Version of Record
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More information

Published date: 1 July 2013
Venue - Dates: RASD2013, 2013-07-01 - 2013-07-03
Keywords: nonlinear dynamics, actuators, stroke saturation
Organisations: Inst. Sound & Vibration Research

Identifiers

Local EPrints ID: 354733
URI: http://eprints.soton.ac.uk/id/eprint/354733
PURE UUID: 5b0a1af9-39ef-4347-b57e-d9d46b91099c

Catalogue record

Date deposited: 31 Jul 2013 09:01
Last modified: 01 Nov 2023 14:44

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Contributors

Author: L.I. Wilmshurst
Author: S.J. Elliott

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