Parametrizing mechanical systems using matrix fraction descriptions: with application to spatio-temporal identification

R. de Rozario, R.J. Voorhoeve, T.A.E. Oomen

Research output: Contribution to conferencePoster

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Abstract

Identifying accurate Linear Parameter Varying models of flexible mechanical systems is crucial for the inference and control of unmeasured performance variables in high-performance mechatronic systems. A succesfull grey-box strategy to obtain accurate models through a local approach is to directly identify canonical mechanical systems, whose parameters can subsequently be interpolated in a physically motivated manner. Estimating these generally nonlinear-in-the parameter modal models from Frequency Response Function data through gradient-based techniques suffers from the potential of converging to sub-optimal estimates. In this research proposes a novel Matrix-Fraction Description parametrisation that is shown to be equivalent to the relevant class of modal mechanical systems. This parametrisation enables the formulation of the Sanathanan-and-Koerner and Instrumental Variables estimators which are known to attain the global optimum upon convergence.
The proposed parametrisation is successfully employed to directly estimate a large set of local models of various position-dependent motion systems, thereby confirming that proposed the identification method is well-suited for practical applications.
Translated title of the contributionHet parametriseren van mechanische systemen met matrix fractie beschrijvingen: met toepassing op spatieel-temporale identificatie
Original languageEnglish
Publication statusPublished - 27 Sep 2017
EventEuropean Research Network System Identification Workshop - Domaine Lyon Saint Joseph, Lyon, France
Duration: 24 Sep 201727 Sep 2017
Conference number: 26
https://ernsi2017.sciencesconf.org/

Conference

ConferenceEuropean Research Network System Identification Workshop
Abbreviated titleERNSI
Country/TerritoryFrance
CityLyon
Period24/09/1727/09/17
Internet address

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