The paper describes the modal analysis of the axial fan, powering one of the wind tunnel of the Department of Aeronautical Engineering of the University of Naples. Starting form the basic components, a numerical finite element model has been assembled. Whenever possible, all the numerical information have been continuously cross-checked with the ongoing experimental analysis. In particular it has been used also the modal density as further parameter, in order to tune the finite element model at growing excitation frequencies. The experimental modal analysis has been carried out by using 194 acquisition points and an electrodynamic shaker. The data have been gathered in the modal analysis software, for studying the system in the 0-500 Hz frequency range. The main result of this phase of the work is represented by the identification of the points to excite the structure for obtaining an adequate vibration and noise reduction through an active device. Looking at this next phase, noise measurements have been also carried out. The preliminary obtained result by the presented experiences have demonstrated that an active noise control device acting on the axial fan could be designed for the wind tunnel facility.
Modal analysis of a fan assembly aimed to active noise control in a wind tunnel / Fontana, M.; De Rosa, S.; Lecce, L.. - 2:(1997), pp. 1980-1986. (Intervento presentato al convegno Proceedings of the 1997 15th International Modal Analysis Conference, IMAC. Part 2 (of 2) tenutosi a Orlando, FL, USA, nel 1997).
Modal analysis of a fan assembly aimed to active noise control in a wind tunnel
De Rosa S.;Lecce L.
1997
Abstract
The paper describes the modal analysis of the axial fan, powering one of the wind tunnel of the Department of Aeronautical Engineering of the University of Naples. Starting form the basic components, a numerical finite element model has been assembled. Whenever possible, all the numerical information have been continuously cross-checked with the ongoing experimental analysis. In particular it has been used also the modal density as further parameter, in order to tune the finite element model at growing excitation frequencies. The experimental modal analysis has been carried out by using 194 acquisition points and an electrodynamic shaker. The data have been gathered in the modal analysis software, for studying the system in the 0-500 Hz frequency range. The main result of this phase of the work is represented by the identification of the points to excite the structure for obtaining an adequate vibration and noise reduction through an active device. Looking at this next phase, noise measurements have been also carried out. The preliminary obtained result by the presented experiences have demonstrated that an active noise control device acting on the axial fan could be designed for the wind tunnel facility.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
