Practical choices in the FRF measurement in presence of nonlinear distortions

Author

Dobrowiecki, Tadeusz P. ; Schoukens, Johan

Author_Institution

Dept. of Meas. & Inf. Syst., Tech. Univ. Budapest, Hungary

Volume

2

fYear

1999

fDate

1999

Firstpage

922

Abstract

The frequency response function (FRF) of the best linear approximation to a nonlinear system is usually measured by averaging system responses to a normally distributed, filtered and clipped random excitation (Gaussian noise). This signal is compared to the multisine signal with random phases. It is shown that a random phase multisine signal defined over an even-odd frequency grid is superior to the Gaussian signal in terms of the variance and the bias of the measured FRF of the approximated nonlinear system

Keywords

Gaussian noise; frequency response; identification; nonlinear distortion; nonlinear systems; FRF measurement; Gaussian noise; Gaussian signal; approximated nonlinear system; best linear approximation; clipped random excitation; even-odd frequency grid; frequency response function; multisine signal; nonlinear distortions; nonlinear system; random phases; system responses; variance; Distortion measurement; Frequency measurement; Information systems; Linear approximation; Noise measurement; Nonlinear distortion; Nonlinear dynamical systems; Phase measurement; Stochastic systems; Visualization;

fLanguage

English

Publisher

ieee

Conference_Titel

Instrumentation and Measurement Technology Conference, 1999. IMTC/99. Proceedings of the 16th IEEE

Conference_Location

Venice

ISSN

1091-5281

Print_ISBN

0-7803-5276-9

Type

conf

DOI

10.1109/IMTC.1999.776998

Filename

776998