1,720,974 research outputs found
Correct and Effective Characterization of Fire-arms Noise:a Basic Aspect to Provide Reliable Input Data for the Reduction of Emitted Noise from Shooting Ranges in Urbanized Area
No full textA large number of noise sources in urbanized areas involve health impairment risk or important annoyance, and characterization and control techniques have been developed to improve the safety and wellbeing of dwellers. But there is a large variety of gun shots due to both the gun and the used
cartridges, and it is almost impossible to dictate a general rule to manage in detail this topic. A clear example of this situations is represented by a shooting range, a limited and well defined installation in which shooting activities are practiced. The shooting ranges, which were since a long time usually located in former military facilities, are nowadays in proximity of densely dwelled areas, due to the recent impressive urbanization rate. Hence, this situation makes necessary that a number of shooting ranges must nowadays accomplish the urban noise classifications. The situation appears to be quite complex in Italy since the national regulations for the measurement and management of the
environmental noise problems associated with the activity of shooting ranges appear to be somehow not exhaustive, this involving administrative and legal problems. The source simulation methods (e.g. continuous pink or white noise) and the propagation models upon which the common computer
assisted techniques are usually based can reduce to a large extent the quality of the control measures, due to poor prediction of the emitted sound power and estimates of the noise propagation pattern
Indagini oggettive e soggettive dell’influenza del rumore e della riverberazione sullo sforzo vocale di insegnanti di scuola primaria
No full textIndagini oggettive e soggettive sull'influenza del rumore e della riverberazione sullo sforzo vocale di insegnanti di scuola primaria
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Un’applicazione del modello EN 12354-5: possibilità di previsione del comportamento acustico di rivestimenti resilienti per pavimenti
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Monitoraggio del segnale vocale per i professionisti della voce
No full textIn letteratura sono presenti diversi lavori che trattano il tema del monitoraggio del segnale vocale e che propongono dispositivi basati su microfoni a contatto indossati dal soggetto monitorato; è inoltre disponibile un dispositivo commerciale, l'Ambulatory Phonation Monitor 3200 della Kaypentax®, che utilizza un sensore per rilevare l'accelerazione alla base del collo indotta dalle vibrazioni delle corde vocali. Questo di-spositivo fornisce una stima del livello di pressione sonora emesso, una volta che l'accelerometro indossato da un soggetto è sottoposto a taratura a fronte di un microfono di riferimento. Altri parametri forniti dallo stesso dispositivo sono la frequenza fondamentale e la durata della fonazione. Il costo di questo dispositivo rende proibitivo il suo uso per la realizzazione di campagne sperimentali estese ad una vasta popolazione. Inoltre, il costruttore non fornisce informazioni sufficienti a valutare l'incertezza dei risultati ottenuti e a garantite la riferibilità ai campioni primari. Il lavoro descritto nella memoria, in una prima parte descrive lo stato dell'arte sulla misura dei parametri e delle dosi vocali riportando i risultati di una recente esperienza di applicazione del dispositivo commerciale APM 3200, e in una seconda parte descrive l'esperienza di progettazione e sviluppo di un nuovo analizzatore vocale portatil
A field investigation on the vibroacoustic impact of an underground metro line
Full text linkThe paper presents the approach used in a field investigation on the vibration impact of a new underground metro line, focusing on population annoyance. The metro consists of a double barrel tunnel equipped with a slab track system: rails are fastened to elastically supported sleeper blocks embedded in a floating concrete slab, cast on a resilient mat. Vibrations were measured over four weeks inside the metro tunnel (on the rail, floating slab and tunnel ring wall) and inside a selected sample of buildings. Transits were monitored with video recordings. Approximately 30000 vibration recordings were collected. A systematic approach was applied to identify the cases in which the vibrations detected inside the buildings could be attributed to metro transits with a high degree of confidence. This task is critical due to the highly variable soil properties and building structures, and to the presence of diverse vibration sources such as surface transportation and building technical systems. The dispersion of the results due to the different characteristics of the rolling stock was also investigated. The results of the study provided a basis for implementing mitigation measures at the sites in which the vibration levels exceeded the limits prescribed by applicable standards
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