1,721,095 research outputs found
Le normative “pubblicistica” e “privatistica” a tutela dell’inquinamento acustico ambientale: insolubile conflitto o possibile sinergia?
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STUDI PRELIMINARI PER LA MISURA DI FRAZIONI LATERALI CON UN SOLO MICROFONO NON DIRETTIVO
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Considerations on the sound absorption of non locally reacting porous layers
No full textThe sound absorption coefficient describes the ability of a porous material to absorb energy. It depends on the intrinsic acoustic properties of the porous material and is sensitive to the type of the wave-front impinging on the porous layer. From the total sound pressure field on the porous material, it is possible to obtain the sound absorption coefficient by separating the incident sound pressure field from the reflected one at the air/porous layer interface. The purpose of this work is to compare the ability of current analytical models to estimate the sound absorption coefficient of porous layers and others acoustical properties such as surface acoustic impedance and reflection coefficient, by using Finite Element Method (FEM) simulations as reference. This study also shows how the sound absorption coefficient of the porous layer varies when a spherical wave-front impinges on its surface
Errors when assuming locally reacting boundary condition in the estimation of the surface acoustic impedance
No full textPreliminary acoustic measurements in the auditorium “Oscar Niemeyer” in Ravello
No full textAfter years of music festivals that were held in wonderful places like ancient churches and terraces overlooking the sea, the town of Ravello on the hills of the Amalfi coast was endowed with an auditorium conceived ten years ago by the now 102 years old Maestro Oscar Niemeyer. The Institution which the authors belong to was involved under the responsibility of the second author in the consultancy for the acoustics related to the last design of the magnificent, but debated, masterpiece of the famous architect Niemeyer. At the end of January 2010 the auditorium was opened to public performances so the authors had the opportunity to check the room acoustics behavior of the main hall. This paper reports about architectural features of the auditorium and the results of preliminary acoustic measurements performed in the unoccupied main hall
L’isolamento acustico per via aerea negli edifici: aspetti critici e procedure di valutazione
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