Abstract
Visco-elastic damping has been used as one type of passive noise control treatment to reduce noise transmission through fuselage skin pan- els. In most conventional applications, uniform coverage of the damping layer is applied to skin panels. Recently, stand-off damping has also been used for aircraft noise reduction. Effects of various damping treatments have been well documented in the published literature. In this paper, some weight-efficient damping treatments, such as edge and wedge damping, are considered. The main objective of this research work is to evaluate passive noise control treatments for a stiffened sidewall section using analytical models. The goal is to achieve an improvement of 3–5 dB in the transmission loss of the sidewall over a conventional passive treatment, over the frequency range from 400 to 2000 Hz. The effect of various damping treatments on the vibration response of a stiffened panel to a point force input, acoustic pressure field and turbulent boundary layer excitation were investigated using a NASTRAN spectral model. The finite-element model of the stiffened panel included visco-elastic damping with and without constraining layer. The material properties of a commercially available constrained layer foam damping were used.
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