caa a22 4500 469108525 CHVBK 20180323133103.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF00430939 doi (NATIONALLICENCE)springer-10.1007/BF00430939 Agneni Alessandro Dipartimento Aerospaziale, Università di Roma ‘La Sapienza', Via Eudossiana 16, 00184, Roma, Italy aut Bias in modal parameters due to aliasing in the time domain [Elektronische Daten] [Alessandro Agneni] This paper deals with some aliasing effects in the time domain that can lead to unacceptable misestimations of modal parameters. When a frequency response function of a vibrating system is sampled and inverse Fourier transformed, the resulting impulse response is given by an infinite geometric series, the single term of which is the impulse response itself shifted in time. For this reason, some modal parameters, if estimated in the time domain, are biased; in particular, while the damping factor and the natural frequency are not influenced by the aliasing phenomenon, the magnitude and phase of the residue can be highly biased. Corrective terms are theoretically evaluated and their efficiency is shown in numerical simulations. Kluwer Academic Publishers, 1991 Modal Analysis nationallicence Identification nationallicence Signal Processing nationallicence Hilbert Transform nationallicence Meccanica Kluwer Academic Publishers 26/4(1992-12-01), 221-228 0025-6455 26:4<221 1992 26 11012 https://doi.org/10.1007/BF00430939 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00430939 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Agneni Alessandro Dipartimento Aerospaziale, Università di Roma ‘La Sapienza', Via Eudossiana 16, 00184, Roma, Italy aut NATIONALLICENCE 773 0- Meccanica Kluwer Academic Publishers 26/4(1992-12-01), 221-228 0025-6455 26:4<221 1992 26 11012 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer