A Wavenumber Approach to Modelling the Response of a Randomly Excited Panel, Part Ii: Application to Aircraft Panels Excited by a Turbulent Boundary Layer

On the sensitivity of sound power radiated by aircraft panels to turbulent boundary layer parameters

“…A total number of M x ¼19 and M y ¼14 panel modes were used to achieve convergence of the results up to 5 kHz. To relate this work to previous studies [23,24], the spectral quantities were calculated based on the panel displacement level predicted for the point ðx,yÞ ¼ ð0:3a; 0:2bÞ. The predicted point RSP is in good agreement with the results in Fig.…”

“…To calculate the RSP sensitivity to each one of the TBL parameters, each parameter was varied while holding all others constant. The numerical study was obtained assuming appropriate parameters for a typical aircraft panel [23,24]. These values are given in Table 2, with Table 3 showing the first 16 panel natural frequencies.…”

“…At these measurement points, the acceleration spectra showed maximum vibration around 1000 Hz, and the phenomenon of hydrodynamic coincidence was identified to occur in the neighborhood of 1000 Hz, at Mach number 0.6. In addition, several theoretical studies have been performed for the vibration and sound radiated by panels excited by turbulent flows [20][21][22][23][24][25][26][27]. The most recent studies, described in [26,27], analyze the noise radiation of TBL excited aircraft panels with stringer and frame attachments.…”

Determining correlation and coherence lengths in turbulent boundary layer flight data

“…The correlation length is a measure of the extent of spatially coherent power in the wall pressure and is thus an important parameter in studies of structural response to boundary layer excitation [1][2][3]. The nature of the boundary layer is particularly important to studies of aircraft interior noise where the boundary layer is the dominant noise source.…”

Exact and numerical responses of a plate under a turbulent boundary layer excitation

“…More recently, very interesting contributions in search of innovative and fast solutions for the stochastic response of a plate has also been addressed by Birgersson et al (2003) and Mazzoni (2003); relevant works are also due to Maury et al (2002), Hambric et al (2004) and Finnveden et al (2005). The last two are the ideal references for the present work since their contents strictly addressed the problem of the applicability of the deterministic simulation (finite element and spectral finite element).…”