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Identification and analysis of nonlinear dynamics of inertial actuators

Identification and analysis of nonlinear dynamics of inertial actuators
Identification and analysis of nonlinear dynamics of inertial actuators

This paper presents an experimental study of the nonlinear dynamics of electrodynamic proof mass actuators. When inertial actuators are used in velocity feedback controllers, their nonlinear dynamics can affect the stability margin of the feedback loop. Thus, it is crucial to identify the nonlinearity sources and to build reliable models that can be implemented in the stability analysis. Firstly, the underlying linear model parameters of an inertial actuator are identified for small excitation signals. The inductance losses at high frequencies due to eddy currents have also been included in the electrical impedance model. Secondly, the nonlinear model of the inertial actuator is determined using the detection, characterisation and identification process. Finally, a numerical analysis is carried out to highlight the implications of nonlinear dynamics of inertial actuators. The proposed methodology is applied to several electromagnetic proof mass actuators, including when the proof mass is not accessible to be directly instrumented.

Electrodynamic inertial actuator, Non-smooth nonlinearity, Nonlinear system identification
0888-3270
338-360
Dal Borgo, Mattia
7eeac32d-7dc9-4645-89cc-acee5a293867
Ghandchi Tehrani, Maryam
c2251e5b-a029-46e2-b585-422120a7bc44
Elliott, Stephen John
721dc55c-8c3e-4895-b9c4-82f62abd3567
Dal Borgo, Mattia
7eeac32d-7dc9-4645-89cc-acee5a293867
Ghandchi Tehrani, Maryam
c2251e5b-a029-46e2-b585-422120a7bc44
Elliott, Stephen John
721dc55c-8c3e-4895-b9c4-82f62abd3567

Dal Borgo, Mattia, Ghandchi Tehrani, Maryam and Elliott, Stephen John (2019) Identification and analysis of nonlinear dynamics of inertial actuators. Mechanical Systems and Signal Processing, 115, 338-360. (doi:10.1016/j.ymssp.2018.05.044).

Record type: Article

Abstract

This paper presents an experimental study of the nonlinear dynamics of electrodynamic proof mass actuators. When inertial actuators are used in velocity feedback controllers, their nonlinear dynamics can affect the stability margin of the feedback loop. Thus, it is crucial to identify the nonlinearity sources and to build reliable models that can be implemented in the stability analysis. Firstly, the underlying linear model parameters of an inertial actuator are identified for small excitation signals. The inductance losses at high frequencies due to eddy currents have also been included in the electrical impedance model. Secondly, the nonlinear model of the inertial actuator is determined using the detection, characterisation and identification process. Finally, a numerical analysis is carried out to highlight the implications of nonlinear dynamics of inertial actuators. The proposed methodology is applied to several electromagnetic proof mass actuators, including when the proof mass is not accessible to be directly instrumented.

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Paper_MDB_MGT_SJE_Ident_Nonlin_IA_R01 - Accepted Manuscript
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More information

Accepted/In Press date: 25 May 2018
e-pub ahead of print date: 14 June 2018
Published date: 15 January 2019
Keywords: Electrodynamic inertial actuator, Non-smooth nonlinearity, Nonlinear system identification

Identifiers

Local EPrints ID: 422312
URI: http://eprints.soton.ac.uk/id/eprint/422312
ISSN: 0888-3270
PURE UUID: e7e0d664-dec1-4223-898f-3914fd2035fc
ORCID for Mattia Dal Borgo: ORCID iD orcid.org/0000-0003-4263-0513

Catalogue record

Date deposited: 20 Jul 2018 16:31
Last modified: 07 Oct 2020 06:40

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