One of the most efficient, cost effective and widely used approaches to reduce the tonal signature of aeronautic engine noise is the so-called liners-structures located in the internal walls of the nacelle (the external structure of the motor) that form an acoustic treatment. In the research project called "Silent Aircraft", funded by FINEP and Embraer S.A. and involving some Brazilian universities, including the Federal University of Santa Catarina (UFSC), an extensive study has been conducted to better understand the behavior of such elements, as well as to predict its effect on engine noise.
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The only cure short of tearing the wall down and rebuilding is to add weight, usually another layer of gypboard. This is most effective if the new gypboard is thicker than the original and if it is glued in place rather than nailed to the studs.
There is no point in doing this halfway-- you must cover all internal walls, preferably on both sides. Additional gypsum gives diminishing returns, but an intermediate layer of soft fiber board can be helpful.
been built at UFSC for the determination of the acoustic impedance of liner samples; on the numerical
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During the past decades several semi-empirical models have been proposed to predict the acoustic impedance of aircraft turbofan liners based on its geometry and operating conditions. Whereas viscous, radiation and backing effects result from analytical solutions, non-linear effects are often based on curve fitting to experimental data. The problem arises when these equations are applied to different geometries and operating conditions than those used in the fiiting procedures since poor agreement between the models can be seen in the literature. Much effort has been made to get more info correct more info terms which are almost negligible especially when non-linear effects i.
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