Showing papers by "Tadeusz Dobrowiecki published in 2000"

Design of multisine excitations to characterize the nonlinear distortions during FRF-measurements

Abstract: In this paper multisine excitation signals are designed which will be used to detect and qualify the nonlinear distortions on FRF measurements, and this without making additional experiments. The kernel idea in this method is to apply well chosen periodic excitations where not all harmonics are excited. The nonexcited frequency lines are used to detect, qualify and quantify the nonlinear distortions, while the FRF is measured at the same time at the excited harmonics. Since not every multisine yields optimal results, this paper presents some signals by which the following purposes are accomplished: simplicity, robustness and a reliable nonlinear characterization.

Frequency response function measurements in the presence of non-linear distortions. A general framework and practical advices

Abstract: In this paper we deal with the measurement of the frequency response function (FRF) of linear dynamic systems in the presence of non-linear distortions. The aim of this paper is to provide the reader insight in the impact of non-linear distortions on FRF measurements. It is shown how to measure the best linear approximation; how to detect, qualify and quantify the non-linear distortions, and this without using additional measurements. Finally, the use of the best linear approximation is illustrated. All results are experimentally verified.