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Experiment design for improved frequency domain subspace system identification of continuous-time systems

Majid Khorsand Vakilzadeh (Institutionen för tillämpad mekanik, Dynamik) ; Vahid Yaghoubi (Institutionen för tillämpad mekanik, Dynamik) ; Tomas McKelvey (Institutionen för signaler och system, Signalbehandling) ; Thomas Abrahamsson (Institutionen för tillämpad mekanik, Dynamik) ; Lennart Ljung
IFAC-PapersOnLine (2405-8963). Vol. 48 (2015), 28, p. 886-891.
[Artikel, refereegranskad vetenskaplig]

A widely used approach for identification of linear, time-invariant, MIMO (multi-input/multi output) systems from continuous-time frequency response data is to solve it in discrete-time domain using subspace based identification algorithm incorporated with a bilinear transformation. However, the bilinear transformation maps the distribution of the frequency lines from continuous-time domain to discrete-time domain in a non-linear fashion which may make identification algorithm to be ill-conditioned. In this paper we propose a solution to get around this problem by designing a dedicated frequency sampling strategy. Promising results are obtained when the algorithm is applied to synthetic data from a 6DOF mass-spring model.

Nyckelord: Bias reduction; Frequency responses; Frequency sampling strategy; Subspace methods; System identification

Denna post skapades 2017-01-26. Senast ändrad 2017-06-28.
CPL Pubid: 247741


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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Dynamik (1900-2017)
Institutionen för signaler och system, Signalbehandling (1900-2017)


Teknisk mekanik

Chalmers infrastruktur