Firecrackers Noise

2003 ◽  
Vol 34 (5) ◽  
pp. 9-12 ◽  
Author(s):  
N. Tandon
Keyword(s):  
Impulse Noise ◽  
Sound Pressure ◽  
Measurement Methods ◽  
Noise Levels ◽  
The World ◽  
Noise Measurements ◽  
Pressure Peak ◽  
Hearing Damage ◽  
High Sound

Fireworks are used all over the world to celebrate special occasions. Noise produced by firecrackers that are used to celebrate these occasions has been highlighted. This impulse type of noise can cause hearing damage. Noise measurements of firecrackers show that they produce high sound pressure peak levels. Typical firecracker impulse noise levels are given. Noise limits and measurement methods used for the fireworks in some countries are presented.

Noise Power Spectrum for Firecrackers

2011 ◽  
Vol 2 (1) ◽  
pp. 62-70 ◽  
Author(s):  
K. B. Patange ◽  
A. R. Khan ◽  
S. H. Behere ◽  
Y. H. Shaikh
Keyword(s):  
Sound Pressure ◽  
Impulsive Noise ◽  
Power Spectra ◽  
Noise Power ◽  
Human Beings ◽  
Noise Levels ◽  
Different Types ◽  
Noise Measurements ◽  
Pressure Peak ◽  
High Sound

Frequency of noise can affect human beings in different ways. The sound of firecrackers is a type of intensive impulsive noise, which is hazardous. In this paper, the noise produced by firecrackers during celebration festivals in Aurangabad (M.S.), India is measured. The noise is analyzed from the study of power spectra for different types of firecrackers. Noise measurements of firecrackers show that they produce high sound pressure peak levels at their characteristics frequencies. Plots of noise power versus frequency for different crackers are presented and the inferences are discussed. Typical firecracker peak noise levels are given.

Noise Power Spectrum for Firecrackers

2013 ◽  
pp. 36-43
Author(s):  
K. B. Patange ◽  
A. R. Khan ◽  
S. H. Behere ◽  
Y. H. Shaikh
Keyword(s):  
Power Spectrum ◽  
Impulsive Noise ◽  
Power Spectra ◽  
Noise Power ◽  
Human Beings ◽  
Noise Power Spectrum ◽  
Noise Levels ◽  
Noise Measurements ◽  
Pressure Peak ◽  
High Sound

Frequency of noise can affect human beings in different ways. The sound of firecrackers is a type of intensive impulsive noise, which is hazardous. In this paper, the noise produced by firecrackers during celebration festivals in Aurangabad (M.S.), India is measured. The noise is analyzed from the study of power spectra for different types of firecrackers. Noise measurements of firecrackers show that they produce high sound pressure peak levels at their characteristics frequencies. Plots of noise power versus frequency for different crackers are presented and the inferences are discussed. Typical firecracker peak noise levels are given.

Design of Generator Acoustic Blanket and its Impact on Generator Cooling Performance

2001 ◽  
Author(s):  
Wei Tong
Keyword(s):  
Sound Pressure ◽  
Noise Exposure ◽  
Cost Effective ◽  
Design Stage ◽  
Cooling Load ◽  
Noise Levels ◽  
Cooling Performance ◽  
Early Design Stage ◽  
Blanket Design ◽  
High Sound

Abstract Generator noise is one of the primary concerns in generator designs. The most cost-effective way to deal with the noise issue is to incorporate the reduction of sound pressure level in an early design stage. Once a generator is manufactured, it is often expensive to modify the design for reducing noise levels. For old generators with high sound pressure levels, an effective method to lower the generator noise exposure is to employ acoustic blankets wrapped on the generator external surfaces. However, with the application of acoustic blankets, heat transfer through generator walls can be greatly reduced, leading to the higher generator core temperature and higher generator cooling load. This paper has addressed the design of generator acoustic blankets and its impact on generator cooling performance. The analysis has shown that the influence of acoustic blankets on the generator thermal performance is low or moderate. This suggests that the current acoustic blanket design is feasible. Results from this study have been used to optimize the blanket design.

scholarly journals Acoustic Simulation’s Verification of WFI ATHENA Filterwheel Assembly

2017 ◽  
Vol 42 (3) ◽  
pp. 483-489
Author(s):  
Adam Pilch ◽  
Tadeusz Kamisinski ◽  
Mirosław Rataj ◽  
Szymon Polak
Keyword(s):  
Main Part ◽  
Sound Pressure ◽  
Pressure Level ◽  
Noise Levels ◽  
Large Area ◽  
Fem Simulations ◽  
Absorbing Material ◽  
Reduce Risk ◽  
High Sound ◽  
Very High

Abstract Ariane 5 rocket produces very high sound pressure levels during launch, what can influence structures located in the fairing. To reduce risk of damage, launch in vacuum conditions is preferred for noise sensitive instruments. In Wide Filed Imager (WFI) project, the main part of the filterwheel assembly is an extremely thin (~240 nm) filter of large area (170×170 mm), very sensitive to noise and vibrations. The aim of this study was to verify numerical calculations results in anechoic measurements. The authors also checked the influence of WFI geometry and sound absorbing material position on sound pressure level (SPL) affecting the filter mounted inside the assembly. Finite element method (FEM) simulations were conducted in order to obtain noise levels in filter position during Ariane 5 rocket launch. The results will be used in designing of WFI filterwheel assembly and endurance of the filter during launch verification.

INVESTIGATION AND EVALUATION OF NOISE LEVEL IN THE NORTHERN PART OF KLAIPEDA CITY/TRIUKŠMO LYGIO ŠIAURINĖJE KLAIPĖDOS MIESTO DALYJE TYRIMAI IR ĮVERTINIMAS/ИССЛЕДОВАНИЕ И АНАЛИЗ ШУМОВОГО УРОВНЯ В СЕВЕРНОЙ ЧАСТИ ГОРОДА КЛАЙПЕДЫ

2008 ◽  
Vol 16 (2) ◽  
pp. 89-96 ◽  
Author(s):  
Vaidotas Vaišis ◽  
Tomas Januševičius
Keyword(s):  
Noise Level ◽  
Heavy Traffic ◽  
Motor Vehicles ◽  
Noise Levels ◽  
June July August ◽  
The World ◽  
Noise Measurements ◽  
June July ◽  
July August September

The problem of noise is topical not only in Lithuania but the world over as well. The northern part of Klaipeda city is distinct for its industry and heavy traffic in the streets. Noise research was carried out in 17 selected measurement locations in the northern part of Klaipeda city. Noise measurements were taken in May, June, July, August, September, October and November. The measurements were made three times during the day: in the day time from 6 a.m. till 6 p.m., in the evening from 6 p.m. till 10 p.m. and at night from 10 p.m. till 6 a.m. The locations of the measurements are marked on the map. In order to distinguish the source of bigger noise between industry and transport, the northern part was divided into two belts. Industry is prevalent in the first belt, whereas the main troublemakers in the second belt are motor vehicles. The measured noise level is compared with permissible standards in measurement locations, where noise level is usually exceeded, and the analysis of noise levels is presented. In order to show the spread of noise in Klaipeda at all three times of the day more vividly, maps of isolines were compiled. Santrauka Triukšmas - ne tik Lietuvoje, bet ir visame pasaulyje aktuali problema. Klaipedos miesto šiaurine dalis yra išskirtine savo pramone ir intensyviu eismu gatvese. Triukšmo tyrimai atlikti šiaurineje Klaipedos miesto dalyje, 17‐oje pasirinktu matavimo vietu. Triukšmas matuotas gegužes, birželio, liepos, rugpjūčio, rugsejo, spalio ir lapkričio menesiais. Matavimai atlikti trimis paros laikais: diena nuo 6–18 valandos, vakare nuo 18–22 valandos ir nakti nuo 22–6 valandos. Matavimo vietos pateiktos žemelapyje. Siekiant nustatyti, kas kelia didesni triukšma ‐ pramone ar transportas, šiaurine miesto dalis suskirstyta i dvi zonas. Pirmojoje zonoje vyrauja pramone, o antrojoje zonoje pagrindinis triukšmo šaltinis automobiliai. Išmatuotas triukšmo lygis palygintas su leistinosiomis normomis. Pateikta matavimo vietu, kuriose dažniausiai viršijamas triukšmo lygis, triukšmo lygiu analize. Siekiant aiškiau parodyti, kaip triukšmas pasiskirsto Klaipedos mieste visais trimis paros laikais, sudaryti izoliniju žemelapiai. Резюме Шум является актуальной проблемой не только в Литве, но и во всем мире. Северная часть города Клайпеды является промышленным районом с интенсивным транспортным движением. Для исследования шума в этой части города было выбрано 17 мест замера. Шум измерялся с мая по ноябрь. Измерения проводились 3 раза в разное время суток: днем в 6–18 ч, вечером в 18–22 ч и ночью в 22–6 ч. Места замеров показаны на карте. С целью установить, что является бóльшим источником шума – промышленные предприятия или транспортные средства, северная часть города была поделена на две зоны. В первой зоне преобладали промышленные предприятия, а во второй – транспорт. Измеренный уровень шума сравнивался с разрешенным нормами. Для мест замеров, в которых чаще всего уровень шума превышал норму, предлагался анализ уровня шума. Для лучшего представления о распределении шума в городе Клайпеде в разное время суток были созданы карты изолиний.

DEVELOPMENT OF THE METHODOLOGY FOR MEASURING NOISE LEVELS IN THE UNDERGROUND ROLLING STOCK

Akustika ◽  
2021 ◽  
pp. 183
Author(s):  
Aleksandr Shashurin ◽  
Konstantiv Fiev ◽  
Viktoriia Vasilyeva ◽  
Andrey Voronkov
Keyword(s):  
Sound Pressure ◽  
Rolling Stock ◽  
Noise Levels ◽  
Noise And Vibration ◽  
Frequency Bands ◽  
Sound Levels ◽  
Digital Spectrum ◽  
Sound Pressure Levels ◽  
Noise Measurements ◽  
Underground Railway

This document specifies the methodology for measuring equivalent sound pressure levels in octave frequency bands (in dB rel. 20 μPa), equivalent and maximum A-corrected sound levels (in dB rel. to 20 μPa), generated in the rolling stock in the driver’s cabins and in the passenger rooms of the salons, using acoustic meters - multifunctional analyzers Ecophysics, noise and vibration meters, spectrum analyzers Ecophysics 110A, Oktava 110A Eco, Oktava 110A, Oktava 111, B&K 2250, 2250L, 2270, noise and vibration analyzers ASSISTANT, noise and vibration meters, digital spectrum analyzers Algorithm-05, SVAN979. This methodology is applicable for noise measurements in the driver’s cabins and in the passenger rooms of the rolling stock of both new and old models operated by the underground railway.

scholarly journals NOISE LEVEL STUDY AND ASSESSMENT IN THE SOUTHERN PART OF PANEVEŽYS

2010 ◽  
Vol 18 (4) ◽  
pp. 271-280 ◽  
Author(s):  
Pranas Baltrėnas ◽  
Egidijus Petraitis ◽  
Tomas Januševičius
Keyword(s):  
Noise Level ◽  
Traffic Flows ◽  
Heavy Vehicles ◽  
Noise Levels ◽  
The World ◽  
Noise Measurements ◽  
Time Periods ◽  
The City ◽  
Level Analysis ◽  
Main Streets

Noise is a relevant problem faced not only by Lithuania but across the world. With motor traffic flow increase, the noise caused by them is also growing and in particular noisy are heavy vehicles and motorcycles. Noise measurements were taken near the main streets in the southern part of Panevežys. Measurements were made during three time periods of the day: in the daytime (from 6 a.m. to 6 p.m.), in the evening (from 6 p.m. to 10 p.m.) and at night (from 10 p.m. to 6 a.m.). In this part of the city noise is mainly generated by cars. The measured noise levels were compared with the noise level limit (NLL) in the measurement places where the NLL is most often exceeded. Noise level analysis and traffic flows are presented in the work. As the performed measurements show, the NLL in the daytime was exceeded by 65%, in the evening by 88%, and at night by 71% of all the total measurements made. The equivalent NLL was exceeded by up to 14 dBA and the maximum NLL – by up to 17 dBA. The highest excess of the NLL was recorded by streets with the heaviest traffic. Santrauka Triukšmas – ne tik Lietuvoje, bet ir visame pasaulyje aktuali problema. Automobiliu srautams vis labiau didejant, dideja ir ju keliamas triukšmas, ypač triukšmingi yra sunkvežimiai ir motociklai. Triukšmo tyrimai atlikti Panevežio pietineje dalyje prie pagrindiniu gatviu. Matavimai vyko skirtingu paros laiku: diena 6–18 val., vakare 18–22 val. ir nakti 22–6 valandomis. Šioje miesto dalyje pagrindine triukšmo priežastis – automobiliai. Triukšmo lygis, išmatuotas vietose, kuriose dažniausiai viršijamas, lyginamas su leidžiamosiomis normomis. Atlikta triukšmo lygiu ir transporto srautu analize. Iš duomenu matyti, kad leidžiamasis triukšmo lygis diena viršytas 65 %, vakare 88 %, o nakti – 71 % atliktu matavimu. Ekvivalentinis triukšmo lygis viršytas iki 14 dBA, o maksimalusis leidžiamasis – iki 17 dB. Labiausiai triukšmo lygis viršijamas prie gatviu, kuriose pravažiuoja daugiausia automobiliu. Резюме Шум является актуальной проблемой не только в Литве, но и во всем мире. С увеличением автомобильных потоков неизбежно увеличивается и вызываемый ими (особенно грузовиками и мотоциклами) шум. Исследования шума проводились в южной части города Паневежиса, вблизи основных улиц в разное время суток: днем с 6 до 18 часов, вечером с 18 до 22 часов и ночью с 22 до 6 часов утра. В этой части города основным источником шума являются автомобили. Измеренные уровни шума были сравнены с допустимыми уровнями для мест, в которых он чаще всего превышен. Произведен анализ уровней шума и транспортных потоков. Из данных измерений видно, что допустимый уровень шума в дневное время был превышен в 65%, вечером – в 88%, а ночью – в 71% проведенных измерений. Эквивалентный уровень шума превышен до 14 дБа, а максимально допустимый – до 17 дБа. Уровни шума особенно увеличены вблизи улиц, по которым проезжает больше всего автомобилей.

Sound Exposure of Secondary School Music Students During Individual Study

2019 ◽  
Vol 34 (2) ◽  
pp. 98-101
Author(s):  
Matilde A Rodrigues ◽  
Sandra Gonçalves ◽  
Paula Neves ◽  
Manuela V Silva
Keyword(s):  
Secondary School ◽  
Sound Pressure ◽  
Music Students ◽  
Individual Study ◽  
Hearing Conservation ◽  
Sound Exposure ◽  
School Music ◽  
The Individual ◽  
Hearing Damage ◽  
High Sound

Music students can be exposed to high sound pressure levels (SPLs) during classes, which can result in hearing damage. However, individual study can also boost their exposure. This short presentation aims to describe the SPLs to which secondary school music students are exposed during individual study, as well as the circumstances in which practice is carried out. The study involved 16 young music students, aged 12–15 yrs old. SPLs were monitored during individual study at school and at the students’ homes. Measurements were performed throughout rehearsals over a 3-week period. The results show that music students are exposed to high SPLs during the individual study, with potential for it to increase, depending on the type and features of the rooms used for practice. Students were not entirely aware of the health risks related to exposure to high SPLs during individual practice, and hearing protection was never used by them. These findings denote that hearing conservation programs targeting music students should also focus on the risks to which they are exposed during individual study in different settings.

scholarly journals University music teachers' exposure to noise and hearing loss

2017 ◽  
Vol 1 (1) ◽  
pp. 49-58
Author(s):  
A. Delgado ◽  
F. Carvalho ◽  
R. B. Melo
Keyword(s):  
Hearing Loss ◽  
Extracurricular Activities ◽  
Sound Pressure ◽  
Noise Exposure ◽  
Music Teachers ◽  
Brass Instruments ◽  
School Of Music ◽  
Exposure Levels ◽  
Hearing Damage ◽  
High Sound

Musical instruments and singers' voices can reach high sound pressure values representing a risk to hearing health, which is of particular relevance for music teachers. Therefore, the potential risk of hearing damage among music teachers in a university school of music was assessed. Twenty teachers completed all phases of the study. Sound pressure levels were measured with a sound meter and daily noise exposure levels were computed and compared with legal reference values in force. Three types of hearing exams were administered to all teachers by health technicians. Most teachers (75%) were subjected to daily noise exposure levels below 80 dB(A). Teaching to play brass instruments appears to be the most risky activity. Only three subjects were diagnosed with noise-induced hearing loss, which cannot be exclusively ascribed to occupational activities because they are involved in extracurricular activities. Increased sample size and the use of noise dosimetry would have improved the study conclusions.

scholarly journals Selection of Level-Dependent Hearing Protectors for Use in An Indoor Shooting Range

2019 ◽  
Vol 16 (13) ◽  
pp. 2266 ◽  
Author(s):  
Rafal Mlynski ◽  
Emil Kozlowski
Keyword(s):  
Sound Pressure Level ◽  
Impulse Noise ◽  
Sound Pressure ◽  
Pressure Level ◽  
Shooting Range ◽  
Noise Parameters ◽  
The People ◽  
Hearing Protectors ◽  
High Sound ◽  
Selection Of

The high sound pressure level generated by impulse noise produced in an indoor shooting range makes it necessary to protect the hearing of the people it affects. Due to the need for verbal communication during training at a shooting range, level-dependent hearing protectors are useful. The objective of this study was to answer the question of whether it is possible to properly protect the hearing of a shooting instructor using level-dependent hearing protectors. The noise parameters were measured in the places where the instructor was present at the shooting range. The division of a specific group of trained shooters into subgroups consisting of three or six simultaneously shooting individuals did not significantly affect the exposure of the shooting instructor to the noise. An assessment of noise reduction was carried out for eight models of earmuffs and two variants of earplugs, using computational methods for the selection of hearing protectors. Among the noise parameters, both the A-weighted equivalent sound pressure level and the C-weighted peak sound pressure level were taken into account. Depending on the assessment criterion adopted, a sufficient reduction in impulse noise was provided by either four or six out of the 10 hearing protectors included in the study.

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