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Previsione dell' attenuazione acustica ottenibile con schermi impiegati nel controllo del rumore emesso da gruppi di raffreddamento dell'acqua di condensazione degli impianti frigoriferi
No full textIndice di valutazione del potere fonoisolante delle pareti doppie: influenza del rapporto delle masse superficiali
No full textNoise reduction in a tractor cab using resonators and active loudspeakers: FEM prediction and experimental verification
No full text
The sound pressure level within a cylindrical chamber with a sinusoidally driven end wall
No full textDeterminazione del lavoro di compressione nelle macchine frigorifere alternative
No full textSi presentano i risultati sperimentali relativi alla misura del lavoro di compressione in un ciclo frigorifero svolto da freon 21. Il lavoro è svolto su di un impianto frigorifero da laboratorio e il compressore è di tipo alternativo. Si esamina l'esponente dell'adiabatica di compressione e si discutono gli effetti di irreversibilità sul coefficiente economico del cicl
Considerazioni sulla valutazione del rischio di perdita d'udito in base alla ISO/DIS 1999.2
No full textExperimental verification of the acoustic effect of the acoustic chamber in the Nuovo Teatro Comunale in Cagliari
No full textThe acoustics of the NUOVO TEATRO COMUNALE in Cagliari
Full text linkIn 1967, the Cagliari municipality started building a new Opera House, to replace the 19th century theatre,
destroyed during the Second World War.
After an initial stage, the works were interrupted due to lack of funds, and restarted only in 1985. Only
when the works were taken up again was the acoustic consultant contacted, who therefore intervened on
an already partly constructed building. It soon became clear that the room shape was problematic from an
acoustic point of view.
Thus, a 1:50 scale model was built on which the first reflection acoustic field was studied. A series of
experimental measurements was also carried out inside the structure. From these experiments it became
clear that the shape of the hall needed to be changed. In particular, the inclination of the side walls had to
be varied in order to increase the number of useful reflections in the central area of the main floor.
The work inside the hall was finished in 1993, but the stage equipment necessary for the production of
operas is still missing. In order to make it possible for the theatre to be inaugurated, an acoustic chamber
was designed and built. This means that the hall can be used for symphony concerts.
The theatre was inaugurated in September 1993 with a concert conducted by Riccardo Muti.
In this paper, the Authors present the experimental results obtained throughout the whole project
development, until the present situation with the acoustic chamber
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