Acoustic study in a main avenue and its effects in classrooms and offices of a university in Mexico City

2021 ◽  
Vol 263 (5) ◽  
pp. 1899-1910
Author(s):  
Antonio Javier Bautista Kuri
Keyword(s):  
Mexico City ◽  
Sound Pressure ◽  
Current Knowledge ◽  
Sound Insulation ◽  
Vehicular Traffic ◽  
Research Activities ◽  
Acoustic Study ◽  
Sound Pressure Levels ◽  
Acoustic Comfort ◽  
High Sound

This study presents the results of a detailed acoustic investigation, systematized and with adequate equipment to the current regulations, carried out in an avenue of intense vehicular traffic located in front of a recently built architectural complex, based on concrete, aluminum, glass, and other materials, called the Postgraduate Unit, belonging to the National Autonomous University of Mexico. These measurements show that, in the initial design of the buildings, the most current knowledge about exterior-interior sound insulation through their facades was not considered. The data collected and the interviews conducted reveal that the Sound Pressure Levels rise, altering the Interior Acoustic Comfort, necessary for the performance of daily academic, administrative and research activities, resulting in permanent inconveniences for users, in addition to the saturation of areas, lack of adequate spaces and excessive unscheduled expenses. Paradoxically, empty spaces are observed in areas with high Sound Pressure Levels, which means that there is a certain level of architectural failure.

scholarly journals Valencia’s Cathedral Church Bell Acoustics Impact on the Hearing Abilities of Bell Ringers

2019 ◽  
Vol 16 (9) ◽  
pp. 1564 ◽  
Author(s):  
Laura García ◽  
Lorena Parra ◽  
Blanca Pastor Gomis ◽  
Laura Cavallé ◽  
Vanesa Pérez Guillén ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Sound Pressure ◽  
Great Distance ◽  
Construction Workers ◽  
Acoustic Study ◽  
Sound Pressure Levels ◽  
Getting Lost ◽  
High Sound ◽  
The Church ◽  
Hearing Abilities

Studies on the effect of occupational noise have been widely performed for occupations such as construction workers, workers of factories or even musicians and workers of nightclubs. However, studies on the acoustics of church bells are very scarce and usually reported in languages other than English. In Spain, although the tradition of bell ringers is progressively getting lost, some bell ringers that continue transmitting the tradition remain. Church bells create sound with a large sound pressure level that can be heard from a great distance. However, despite the characteristics of the sound of church bells, bell ringers do not present symptoms of occupational hearing loss unlike musicians and construction workers. To determine the effects of the sound of the church bells on bell ringers, in this paper, an acoustic study of the church bells and a physiological study of the hearing abilities of bell ringers. Results show sound pressure levels reaching 120 dB inside the bell tower. The resulting hearing loss in bell ringers is small considering the great intensity of the sound produced by the bells. This is likely due to the short amount of time that bell ringers are exposed to the sound even if it reaches high sound pressure levels.

scholarly journals Automotive traffic noise and urban public spaces

2021 ◽  
Vol 9 (72) ◽  
Author(s):  
Greicikelly Gaburro Paneto ◽  
Cristina Engel de Alvarez ◽  
Paulo Henrique Trombetta Zannin
Keyword(s):  
Urban Space ◽  
Sound Pressure ◽  
Traffic Noise ◽  
Motor Vehicles ◽  
Open Spaces ◽  
Sound Levels ◽  
Measurement Results ◽  
Sound Pressure Levels ◽  
High Sound

In contemporary cities, and usually without realizing it, the population has been exposed to high sound pressure levels, which besides causing discomfort, can lead to health problems. Considering that a large part of this noise comes from emission from motor vehicles, this research aims to evaluate the sound behavior in sound environments configured by voids in the urban fabric, in order to identify whether open spaces can act as attenuators of sound levels. To obtain the expected results, the methodology used was structured from a review of the state-of-the-art and computer simulations relating the variables that influence the formation of urban space and sound emission and propagation, taking as a case study an urban portion of the municipality of Vitória/ES. In parallel, questionnaires were applied to evaluate the user's perception of their exposure. The measurement results indicated that the sound pressure levels caused by traffic noise are above the limit tolerated limit by the NBR norm 10151:2000 for the daytime period. In turn, the results obtained from the population indicated that there is little perception of noise by the users of the spaces surveyed.

Acoustic Resistance of an Orifice at High Sound Pressure Levels

2018 ◽  
Vol 64 (5) ◽  
pp. 563-566 ◽  
Author(s):  
A. I. Komkin ◽  
A. I. Bykov ◽  
M. A. Mironov
Keyword(s):  
Sound Pressure ◽  
Sound Pressure Levels ◽  
Acoustic Resistance ◽  
High Sound

scholarly journals Environmental ultrasound in laboratories and animal houses: a possible cause for concern in the welfare and use of laboratory animals

1988 ◽  
Vol 22 (4) ◽  
pp. 369-375 ◽  
Author(s):  
G. D. Sales ◽  
K. J. Wilson ◽  
K. E. V. Spencer ◽  
S. R. Milligan
Keyword(s):  
Sound Pressure ◽  
Visual Display ◽  
Laboratory Animals ◽  
Upper Limit ◽  
Sound Pressure Levels ◽  
Hearing Range ◽  
Human Hearing ◽  
High Sound ◽  
Possible Cause

Many laboratory animals are known to be sensitive to sounds (ultrasounds) beyond the nominal upper limit (20 kHz) of the human hearing range. Sources of sound in laboratories and animal houses were examined to determine the extent of ambient ultrasound. Of 39 sources monitored, 24 were found to emit ultrasonic sounds. Many of these (e.g. cage washers and hoses) also produced sound in the audible range. Running taps, squeaky chairs and rotating glass stoppers created particularly high sound pressure levels and contained frequencies to over 100 kHz. The oscilloscopes and visual display units investigated provided particular cause for concern as they emitted sounds that were entirely ultrasonic and therefore were apparently silent. Ambient ultrasound therefore appears to be common in laboratories and animal houses. It is suggested that its effect on laboratory animals should be investigated and guidelines on acceptable levels be formulated.

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