Frequency-domain identification of aircraft structural modes from short-duration flight tests

New developments for experimental modal analysis of aircraft structures

“…As first discussed in [8] for the case of SISO discrete-time transfer functions, it is necessary to integrate corrective terms in the Fourier analysis so as to avoid a biased estimation of the system parameters. Recently, we suggested a similar solution in [6] for the identification of MIMO continuous-time transfer functions. In the latter, it was shown that considering the limit effects explicitly in the identification problem implies to solving a similar identification problem as in Eq.…”

“…Moreover, the numerical integration of the Fourier transform was discussed in [6]. We showed that choosing…”

“…For more details, the interested reader can refer to [6,9]. The integration of limit effects is of significant importance if one wants to consider short data sequences as illustrated in Fig.…”

“…First, it enables to decrease the amount of data and consequently the system identification processing time, especially when high dimensional systems are studied. Second, this is an efficient way of improving the signal to noise ratio, and consequently the accuracy of the system identification [6].…”

“…A first version of this algorithm was suggested in [5]. The actual algorithm is the result of several developments carried on from this first version so as to improve its performance [5,6].…”