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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This straightforward method is simple in its basic principle but remarkably has the advantages of ultimately overcoming the drawbacks inherent to the inverse methods, incorporating the realistic multimode nonprogressive wave effects, high computational efficiency, possibly reducing the measurement points, and even avoiding the necessity of the duct exit impedance that bothers perhaps all the existing waveguide methods.
Has this ever happened to you? You are playing your latest masterpiece at a party at a friend's place, and when the best song comes on you want to hide under the couch-- the bass is boomy, the highs screech, and along with the backup vocals you can definitely hear Gilligan's Island. If you find this experience familiar, you more info are probably the victim of BAD ACOUSTICS.
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These same principles can be applied to floors and ceilings. A heavy false ceiling hung on springs can match the performance of a double wall-- If there is a room below the studio, it should get a double ceiling too.
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Close the door and you can figure what you already have. If the level does not change when you close the door, you know where to start!
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Air ducts present a special problem. You don't want to cover them up (even keyboard players have to breathe), but they are a veritable freeway for sound. To soundproof air vents build a baffle as illustrated in figure 4.
TriSoft's triangular faceted pyramid faces are composed get more info of SoftSound® acoustical material with a metal substructure. SoftSound® is made up of 100% PET plastic with up to 60% recycled content. Arktura materials have a high proportion of recycled content and can be recycled.
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