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Dynamic analysis of nonlinear behaviour in inertial actuators

Dynamic analysis of nonlinear behaviour in inertial actuators
Dynamic analysis of nonlinear behaviour in inertial actuators
Inertial actuators are devices typically used to generate the control force on a vibrating structure. Generally, an inertial actuator comprises a proof-mass suspended in a magnetic field. The inertial force due to the moving mass is used to produce the secondary force needed to control the vibration of the primary structure. Inertial actuators can show nonlinear behaviour, such as stroke saturation when driven at high input voltages. If the input voltage is beyond their limit, they can hit the end stop of the actuator casing and saturate. In this paper, the force generated by an inertial actuator is measured experimentally and numerical simulations of a linear piecewise stiffness model are carried out and compared with the results of analytical methods. First, a numerical model for a symmetric bilinear stiffness is derived and a parametric study is carried out to investigate the change of the end stop stiffness. In addition, the variation of the amplitude of the excitation is considered and a comparison is made with the analytical solution using the harmonic balance method. Finally, experimental measurements are carried out and the results are compared with simulated data to establish the accuracy of the model.
1742-6588
1-12
Dal Borgo, Mattia
d2b1ebc3-8b5f-4bb1-8b73-c1012e45241d
Ghandchi Tehrani, Maryam
c2251e5b-a029-46e2-b585-422120a7bc44
Elliott, Stephen
721dc55c-8c3e-4895-b9c4-82f62abd3567
Dal Borgo, Mattia
d2b1ebc3-8b5f-4bb1-8b73-c1012e45241d
Ghandchi Tehrani, Maryam
c2251e5b-a029-46e2-b585-422120a7bc44
Elliott, Stephen
721dc55c-8c3e-4895-b9c4-82f62abd3567

Dal Borgo, Mattia, Ghandchi Tehrani, Maryam and Elliott, Stephen (2016) Dynamic analysis of nonlinear behaviour in inertial actuators. Journal of Physics: Conference Series, 1-12. (In Press)

Record type: Article

Abstract

Inertial actuators are devices typically used to generate the control force on a vibrating structure. Generally, an inertial actuator comprises a proof-mass suspended in a magnetic field. The inertial force due to the moving mass is used to produce the secondary force needed to control the vibration of the primary structure. Inertial actuators can show nonlinear behaviour, such as stroke saturation when driven at high input voltages. If the input voltage is beyond their limit, they can hit the end stop of the actuator casing and saturate. In this paper, the force generated by an inertial actuator is measured experimentally and numerical simulations of a linear piecewise stiffness model are carried out and compared with the results of analytical methods. First, a numerical model for a symmetric bilinear stiffness is derived and a parametric study is carried out to investigate the change of the end stop stiffness. In addition, the variation of the amplitude of the excitation is considered and a comparison is made with the analytical solution using the harmonic balance method. Finally, experimental measurements are carried out and the results are compared with simulated data to establish the accuracy of the model.

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Accepted/In Press date: 12 August 2016
Organisations: Signal Processing & Control Grp

Identifiers

Local EPrints ID: 399596
URI: http://eprints.soton.ac.uk/id/eprint/399596
ISSN: 1742-6588
PURE UUID: 7b1654f0-0d04-4d20-9849-15b46e8cbd65

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Date deposited: 22 Aug 2016 08:34
Last modified: 07 Oct 2020 05:48

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Contributors

Author: Mattia Dal Borgo
Author: Stephen Elliott

University divisions

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