Idioma:

MISMATCHING WINDOWS CAN CAUSE FREQUENCY RESPONSE FUNCTION NOTCHES TO APPEAR AS PEAKS

McConnell, Kenneth G. ; Varoto, Paulo S.

Mechanical systems and signal processing, 1996-05, Vol.10 (3), p.341-350 [Periódico revisado por pares]

Texto completo disponível

Citações Citado por

Título:
MISMATCHING WINDOWS CAN CAUSE FREQUENCY RESPONSE FUNCTION NOTCHES TO APPEAR AS PEAKS
Autor: McConnell, Kenneth G. ; Varoto, Paulo S.
É parte de: Mechanical systems and signal processing, 1996-05, Vol.10 (3), p.341-350
Descrição: This paper examines the errors in frequency response function (FRF) estimators H 1(ο) and H 2(ο) caused by improper input and output signal windowing while using random excitation modal tests. These errors are enhanced when the FRF has resonances and anti-resonances that are closely spaced. An experimental analysis is performed on a free–free beam. The beam is excited with broad band random excitation over a frequency range covering the first five natural frequencies. The driving point accelerance FRF is calculated from both estimators H 1(ο) and H 2(ο). The results show that erroneous FRFs can be obtained when the wrong type of window is employed and these errors are due to digital filter leakage. A theoretical model is proposed in order to explain the discrepancies that were found experimentally. Simulated results from 2 dof system are presented that show the influence of different types of windows on the FRFs.
Editor: Elsevier Ltd
Idioma: Inglês

Voltar para lista de resultados

Anterior Resultado 8 Avançar Ir para próxima página