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Dissertations / Theses on the topic 'Equivalent sound pressure level'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Van, der Aerschot Mathieu. "Affordable headphones for accessible screening audiometry : an evaluation of the sennheiser hd202 ii supra-aural headphone." Diss., University of Pretoria, 2016. http://hdl.handle.net/2263/58766.

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It is estimated that approximately 360 Million people have a permanent disabling hearing loss (WHO, 2015). The majority of these people live in lower to middle income countries, where screening and follow-up treatment is not always accessible (WHO, 2015). School based hearing screening is one of the procedures that are not always available due to a number of challenges one of which include the high cost of audiometrical headphones. School based hearing screening is performed with an audiometrical headphones and audiometer, it usually can be used to test all school-aged children and adults. In

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2

Tarquinio, Nancy. "Newborn response to decreased sound pressure level." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74573.

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Human newborns' response to decreased sound pressure level (SPL) was investigated with a localized headturning habituation procedure. Following criterion orientation (three headturns toward the sound out of four consecutive trials) and habituation (three consecutive trials with no headturns or headturns away from the sound), study 1 and 2 assessed newborn female infants' (M age = 41 hrs.) responses to lower-volume sounds immediately following habituation and following a 55-sec delay, respectively. Generalization of habituation to decreased volume following delay with recovery immediately follo

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Fagelson, Marc A., and Frederick N. Martin. "The Occlusion Effect and Ear Canal Sound Pressure Level." Digital Commons @ East Tennessee State University, 1998. https://dc.etsu.edu/etsu-works/1582.

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Comparisons were made between changes in the audibility of bone-conduction stimuli to differences in the sound pressure present in the external auditory canal when ears were occluded. Fifteen listeners with normal middle ear function were tested using pure tones of 250, 500, and 1000 Hz, delivered via a bone-conduction oscillator placed on the mastoid process and the frontal bone. At all three frequencies, and both sites of stimulation, ear canal sound pressures were greater in the occluded than in the unoccluded conditions. Concurrently, the test signals were detected at lower intensities, al

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4

Grodek, Kristen Ashley. "The Effect of Sound Pressure Level Variation on Aerodynamic Measures." Miami University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=miami1239321162.

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5

Olsson, Mikael, and Anders Söderberg. "Design guideline for audible warning signal and determination of sound pressure characteristics : Second version." Thesis, Örebro universitet, Akademin för naturvetenskap och teknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-19412.

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Today Atlas Copco Rock Drills AB hasn’t got any method to determine how many warning alarms they need on their machines and how they should be mounted to use their full potential. At the moment a travel alarm is usually placed in the front of the machine and a reverse alarm in the back. Then a measurement of the sound pressure level around the machine is performed to see if it is enough to pass the limit according to different ISO-standards. Otherwise they have to mount some extra alarms and then do the measurements again until the standards are fulfilled. The aim of this thesis work is to dev

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6

Gustafsson, Linda. "Undersökning av ljudnivåer på skolgårdar : - samt hur fasad och fönster dimensioneras med uppmätta värden." Thesis, Mälardalen University, Department of Public Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-5733.

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<p>This report is written on commission by WSP Acoustics. The report studies the outdoor sound levels on school yards in Stockholm. The questions given by the company to be answered was what are the actual sound levels at diffrent school yards with low traffic noise and how can you construct a facade element that reduces the sound level from the outside and meet the indoor requirements. Mesurements for four hours was done at eight schools set north and south of the city centre. The measurement period included one school break and one lunch break. The results of the measurements were that the e

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WINTZELL, LOUISE. "Acoustic Textiles : the case of wall panels in home environment." Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-17698.

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Abstract Noise has become an increasing public health problem and has become serious environment pollution in our daily life. This indicates that it is in time to control and reduce noise from traffic and installations in homes and houses. Today a plethora of products are available for business, but none for the private market. The project describes a start up of development of a sound absorbing wall panel for the private market. It will examine whether it is possible to make a wall panel that can lower the sound pressure level with 3 dB, or reach 0.3 s in reverberation time, in a normally fur

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8

Sonja, Krstić. "Istraživanje uticaja promene vrste materijala na frekvencijski spektar muzičkih instrumenata." Phd thesis, Univerzitet u Novom Sadu, Tehnički fakultet Mihajlo Pupin u Zrenjaninu, 2009. https://www.cris.uns.ac.rs/record.jsf?recordId=71264&source=NDLTD&language=en.

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Disertacija obuhvata opis osnovnih pojmova i metoda merenja iz oblasti muzičke akustike, detaljnije razrađeni teorijski model pona&scaron;anja zvučnog talasa u cevi frule i detaljnu analizu frekvencijskog spektra tonova odsviranih na jednodelnim i dvodelnim frulama, na glavi dvodelnih frula i tonova dobijenih upotrebom različitih vrsta prigu&scaron;ivača.<br>The dissertation presents a description of the Musical acoustics basic facts andmeasuring methods , a profoundly developed theoretical model of behaviour of sound waves in sheperd's flute, and very detailed frequency spectrum analysis

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9

Virebrand, Marcus. "Real-time monitoring of voice characteristics usingaccelerometer and microphone measurements." Thesis, Linköpings universitet, Reglerteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-69760.

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VoxLog is a portable voice accumulator, that uses both an accelerometer that measures skin vibrations and a regular microphone to collect data. The goal of the thesis was to implement and evaluate methods that based on this data estimate the three different voice parameters fundamental frequency, phonation and soundpressure level. For pitch, three different methods were evaluated. The different methods all require relatively low computational power since the goal was to implement at least one of them on the digital signal processor in the VoxLog. The results from these evaluations show that th

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10

Björklund, Staffan. "Normativa data för samband mellan subglottalt tryck och ljudtrycksnivå." Thesis, Uppsala universitet, Logopedi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-217727.

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Syftet med föreliggande studie var att undersöka sambandet mellan subglottalt tryck och ljudtrycksnivå, och undersöka inverkan av kön och tonhöjd. Röststyrkan är starkt beroende av subglottalt tryck och sambandet har analyserats i ett flertal studier, som alla visar på ett linjärt förhållande mellan logaritmen av subglottala trycket och ljudtrycksnivån (SPL). Schutte (1980) analyserade sambandet för 21 kvinnor och 24 män som producerade ett stort antal mätdata med olika SPL och tonhöjd. Tryck mättes med ballong i esofagus. Tanaka & Gould (1982) analyserade 4 kvinnor och 6 män på tre ljudn

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11

Lane, Jeremy David. "Active Control of Noise Through Windows." Thesis, University of Canterbury. Mechanical Engineering dept, 2013. http://hdl.handle.net/10092/10523.

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Windows are a weakness in building facade sound transmission loss (STL). This coupled with the detrimental effects of excessive noise exposure on human health including: annoyance, sleep deprivation, hearing impairment and heart disease, is the motivation for this investigation of the STL improvements active noise control (ANC) of windows can provide. Window speaker development, ANC window experiments and analytical modelling of ANC windows were investigated. Five different window speaker constructions were characterised then compared with a previously developed window speaker. ANC window tes

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Waerder, Maximilian, and Hubertus Murrenhoff. "On the origin and measurement of noise emission in pneumatics." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200524.

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Noise is a circumstance of ordinary life and mainly originated by continually growing dynamic and the rapid development of society. In the industrial environment there are noise-intensive parts that influence the condition of present operators negatively. Thus, measures of noise abatement have been investigated intensely by industrial companies as well as federal agencies. As a subdomain of fluid power pneumatics is especially known for characteristic noise emission by the use of air as power transmission. The transient decompression of air from pressure levels up to 8 bar and partly high flow

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13

Rugaitis, Šarūnas. "Šiaulių miesto triukšmo šaltinių analizė." Bachelor's thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130821_131435-28848.

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Garso lygio matavimai Šiaulių mieste buvo atlikti geguţės mėnesį. Tyrimų vietos buvo pasirinktos gyvenamojoje aplinkoje prie didţiųjų prekybos centų „Akropolis“, „Tilţė“, „Bruklinas“ ir „Saulės miestas“, gyvenamojoje aplinkoje prie geleţinkelio stoties, Šiaulių reabilitacijos centro aplinkoje, prie J. Janonio gimnazijos, kuriai didţiausią triukšmą sukelia autotransportas ir šalia Jovaro progimnazijos. Palyginimui, tose pačiose vietose matavimai buvo ir savaitgalio metu. Didţiausias ekvivalentinis garso lygis išmatuotas šalia prekybos centro „Saulės miestas“. Aukštas triukšmo lygis uţfiksuotas

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14

Karlsson, Karl-Johan. "Experimental study of how a motorized lower spray arm affects energy usage, wash result and sound level in a household dishwasher : A 3-level full factorial design investigating the effects of water pressure, rotational velocity and wash time." Thesis, Karlstads universitet, Institutionen för ingenjörs- och kemivetenskaper (from 2013), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-85622.

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As the energy efficiency of dishwashers continuously improves, differentmanufacturers need to find new innovative solutions to further improve thedishwashers. To do so one can divide the areas of improvement into 4 parameters,water temperature, washing time, chemical treatment and mechanical processing.In this thesis the focus lies on the mechanical processing and the washing time. The conventional spray arm of today's dishwashers sets its rotational velocitythrough the water pressure. To step away from this ASKO Appliances AB hasdeveloped a prototype with a motorized lower spray arm. The purp

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Gutierrez, Anca Waldir Eduardo, and Villegas Erick Alexander Justiniano. "Análisis y diseño de barreras acústicas con una capa de concreto estructural y otra de concreto con agregados de aserrín y viruta, en la sección vial de la Panamericana Norte, entre los km 31 y 35, distrito Puente Piedra." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/653975.

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La zona en estudio, ubicada entre los kilómetros 31 y 35 de la carretera Panamericana Norte, posee un nivel de presión sonora promedio de 76.48dB y 74.76dB en el horario diurno y nocturno respectivamente, y tomando como base Los Estándares de Calidad de Ruido Ambiental (ECA) se puede determinar que la zona en estudio se produce contaminación acústica. Por ello, las personas que frecuentan y/o circulan por esta zona se encuentran propensas a contraer distintas enfermedades y molestias producto de la contaminación sonora, entre ellas: Estrés, pérdida de audición con el paso del tiempo, problemas

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16

Donofre, Ana Carolina. "Estímulos sonoros na incubação artificial de ovos: efeitos na eclosão, desempenho produtivo e comportamento pós-eclosão de pintos de corte." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/11/11152/tde-04102018-105552/.

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Os fatores físicos que envolvem a incubação artificial são determinantes no desenvolvimento embrionário, eclosão e desempenho das aves. Muitos deles são bem-conceituados, mas acredita-se que ainda existem questões que possam prover melhorias ou adaptar este processo as novas demandas da produção animal. Nesta pesquisa, a bioacústica é colocada como uma dessas questões, motivando a investigação da estimulação sonora na incubação artificial, dados os efeitos do ruído dos incubatórios comerciais e a adição de vocalizações da espécie em respostas fisiológicas, produtivas e comportamentais de pinto

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17

Bernard, Jan. "Porovnání hlučnosti stranových vyústek odlišných konstrukcí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401525.

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This diploma thesis deals with comparing noise levels of three side vents of different constructions, which are used for distribution and directing of ventilation air in a cabin of an automobile. The fundamental knowledge of the physical and physiological acoustics is described in the introduction part of this study. Following the introduction part there is a brief explanation of the car air conditioning system (HVAC system) as well as are explained the acoustic properties of specific elements of this system. The study also deals with dividing ventilation vents and describes the vast traceable

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18

Li, Qi. "Acoustic noise emitted from overhead line conductors." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/acoustic-noise-emitted-from-overhead-line-conductors(90a5c23c-a7fc-4230-bbab-16b8737b2af2).html.

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The developments of new types of conductors and increase of voltage level have driven the need to carry out research on evaluating overhead line acoustic noise. The surface potential gradient of a conductor is a critical design parameter for planning overhead lines, as it determines the level of corona loss (CL), radio interference (RI), and audible noise (AN). The majority of existing models for surface gradient calculation are based on analytical methods which restrict their application in simulating complex surface geometries. This thesis proposes a novel method which utilizes both analytic

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Stejskal, Tomáš. "Hlukoměr pro embedded systémy." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-220380.

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The aim of this work is the design and implementation of a sound level meter for emdedded systems. It is designed sound level meter sensor. This sensor includes a microphone, microphone preamplifier and ADC. This sensor is connected to a development kit STM32F4 Discovery, where sound is processed. It is processed filtration, time weighting, calculation of sound leve and loudness weighting. The sound level is then sent via the serial communication USART. This thesis includes a theoretical analysis of noise and its human perceptions. It also describes the development platform used.

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Salles, Laís Monique Mendes. "Desenvolvimento de um dispositivo de medição de ruído com base no sistema OpenWrt." Ilha Solteira, 2017. http://hdl.handle.net/11449/154132.

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Orientador: João Antônio Perreira<br>Resumo: O presente trabalho tem como proposta o desenvolvimento de um dispositivo de medição de ruído utilizando componentes e dispositivos eletroeletrônicos de baixo custo para uso no monitoramento de ruído em ambientes de trabalho. No desenvolvimento e implementação do sistema de medição foram estudas duas proposta de dispositivos, uma com base na plataforma Arduino e outra com base no sistema OpenWrt em conjunto com um roteador. Os circuitos de captação do ruído foram desenvolvidos com base em circuitos de captação de sinais já existentes, identificando

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21

Sanchez, Huapaya Alonso Sebastián, and Pinillos Sergio André Serpa. "Aplicación de redes neuronales convolucionales para la emulación del modelo psicoacústico MPEG-1, capa I, para la codificación de señales de audio." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/652711.

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El presente trabajo propone 4 alternativas de codificadores inspirados en el codificador MPEG-1, capa I, descrito en el estándar ISO/IEC 11172-3. El problema que se intenta resolver es el de requerir definir un modelo psicoacústico explícitamente para lograr codificar audio, reemplazándolo por redes neuronales. Todas las alternativas de codificador están basadas en redes neuronales convolucionales multiescala (MCNN) que emulan el modelo psicoacústico 1 del codificador mencionado. Las redes tienen 32 entradas que corresponden a las 32 subbandas del nivel de presión sonora (SPL – sound pressure

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22

Mieskoski, Randy. "Capturing and Modeling a Three-Dimensional Stationary Noise Source Directivity Pattern with a Dynamic Array in the Near Field." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1387979181.

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23

Hájková, Lenka. "Akustika malých ventilátorů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-355641.

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Dissertation thesis falls within area of indoor climate and deals with investigation of acoustic microclimate in sanitary rooms of residential buildings during a mechanical ventilation. Sources of a noise in these areas are small fans. The thesis contains the evaluation of the existing situation concerning the referred issue, physical laws of acoustics and theoretical basics of acoustics of air conditioning. The part of the thesis is experimental measurement which aims to evaluate the situation in real applications and the possibility of influencing the acoustic microclimate by affixing of sma

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Solomon, Brad K. "Methods for Identifying Acoustic Emissions From the Front Face of a Small Piezoelectric Blower." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3542.

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This thesis focuses on identifying acoustic noise generating components in piezoelectric blowers through transverse velocity measurements and the development of a numerical fluid model. Piezoelectric ceramics have proven useful for many industries and areas of research involving: high precision actuators, noise control, ultrasonic devices, and many other areas. As of late, a unique adaptation of piezoelectric ceramics is surfacing in the area of pumping and cooling. Air pumps that use these ceramics replace the traditional electric motor, resulting in lower power consumption, less moving parts

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Täschner, Dirk. "Untersuchungen der akustischen Wirkung von Tragrollen zur zielgerichteten Lärmminderung an Gurtförderanlagen." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2017. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-220185.

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Gurtförderanlagen werden im Bergbau und anderen Industriezweigen zum Transport von Schüttgütern eingesetzt. Der Anlagenbetrieb ist mit Geräuschemissionen verbunden. Dies kann bei Kontrolle und Wartung eine erhöhte Lärmbelastung für betroffene Mitarbeiter hervorrufen. Im Umfeld von Wohnbebauungen oder schutzbedürftigen Objekten kann die Überschreitung von Immissionsrichtwerten zu einer zeitlichen Betriebseinschränkung der hocheffizienten Anlagen führen. Zur Lärmminderung an der Quelle oder deren Nähe erfordert dies technische Schallschutzmaßnahmen. Die Tragrollen im Obertrum der Gurtförderanlag

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Ghadiani, Ali. "Aerodynamics and aeroacoustic of sail masts." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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In this thesis, the turbulent flow induced by sail masts is simulated using compressible k-w SST detached eddy simulation (DES). The mast is investigated in two different yaw angles at 0 and 90 and the predetermined condition is V = 20 m/s to find the main broadband and tonal noise sources. And then the same cases are compared to simple shape of sail mast without internal cavities. The purpose of this work is to investigate whether the cases generate tonal noise when winds past the sail mast. Another objective is to study aerodynamic parameters around the four cases. The influence of the mast

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Galante, Beatrice Maria Perla. "Modellazione di sorgente pneumatica ad aria compressa e propagazione degli impulsi acustici in ambiente marino." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21761/.

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Lo scopo del lavoro di tesi, data una specifica sorgente pneumatica ad aria compressa, è interpretare la propagazione del suono in mare in campo lontano e come questa possa eventualmente interferire con le specie marine, in particolar modo sui cetacei. Il lavoro si compone di due parti principali: la modellazione di un impulso di una specifica sorgente ad aria compressa, tramite l’utilizzo del software SeismicAirgun (Watson et al, 2016) e la modellazione della propagazione del segnale acustico di quest’ultima tramite l’utilizzo del software QSEIS (Wang, 1999). L’esperimento di simulazione ri

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Horák, Josef. "Regulace přítlaku lamelových spojek dvouspojkové převodovky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417762.

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The master’s thesis deals with ways of controlling starting clutches of cars, especially of DQ200 gearbox, which contains dry disc clutches. The introduction describes basic principles of torque transfer and amount of clutch force. Then the description of construction of starting clutches and ways of controlling clutch types mentioned beforehand is given. In the next part of the thesis, wide spectrum of control methods is measured, from which a certain part is selected. This is followed by driving tests and based on driving data, one method of the clutch control is chosen. Then those control m

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Zlámal, Josef. "Hluk rovinných desek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-377486.

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The master thesis summaries the findings results of a study focused on the spread of noise vibrating flat plates. Part of this thesis is measurements of flat plate noise in the anechoic chamber and finally their processing and evaluation. The next part of the thesis is focused on FEM acoustic simulation and comparing results with measurements.

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Jelínek, Ondřej. "Akustické mikroklima nevýrobních objektů." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225943.

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This master´s thesis focuses on effect of acoustic microclimate in non-production buildings to human. Within elaboration this topic was made measurment acoustic power level and created protocols by valid technical standards and law. I dedicate to damping noise and aerodynamic noise in airconditioning in part topic analysis. The part aplication on real object deal with assessment current status and draft measure for improve acoustic ratio in laboratories in center of research located in Brno. That includes describe of air-cndition unit and development two variants and their rating.

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Alsouda, Yasser. "An IoT Solution for Urban Noise Identification in Smart Cities : Noise Measurement and Classification." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-80858.

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Noise is defined as any undesired sound. Urban noise and its effect on citizens area significant environmental problem, and the increasing level of noise has become a critical problem in some cities. Fortunately, noise pollution can be mitigated by better planning of urban areas or controlled by administrative regulations. However, the execution of such actions requires well-established systems for noise monitoring. In this thesis, we present a solution for noise measurement and classification using a low-power and inexpensive IoT unit. To measure the noise level, we implement an algorithm for

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Černoch, Adam. "Vyhodnocování dopravního hluku a jeho modelování." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226952.

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The task of the master's thesis is introduction with the problems of traffic noise, focusing on noise from road traffic. There is a description what is the noise, how it is formed, its resources and what are the methods of measuring. The following are the various noise reduction measures such as noise barriers and low noise pavements. The main attention is devoted to the noise generated at the tire / road that is reduced by these pavements. The practical part describes the implemented measurements on individual sections at various locations in our country. The measurement was carried by slight

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Kantová, Radka. "SNIŽOVÁNÍ HODNOTY STAVENIŠTNÍHO HLUKU POMOCÍ MODELOVÁNÍ VÝROBNÍHO PROSTORU STAVBY A ÚPRAV TECHNOLOGICKÝCH POSTUPŮ PŘI VÝSTAVBĚ." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-392280.

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This doctoral thesis focuses on noise generated during construction. It defines the legislative and physical aspects of this topic. It determines heavy machinery as noise source and categorizes them by their usage in construction technologies. It collects source data of the machinery noises which can be further used in prognostic models. It analyses the level of construction noise which can impact the nearby residential areas and offers methodology for modelling and designing the possible arrangements for the noise reduction. It defines partial effects of the construction site which are signif

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Ruini, Mattia. "Modellazione di un sistema per la dissipazione delle vibrazioni generate dall'installazione delle fondazioni delle turbine eoliche." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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L’infissione nel fondale marino di pali in acciaio di grandi dimensioni costituenti la sottostruttura delle turbine eoliche provoca la nascita e la propagazione di un campo di vibrazioni inquinanti. Tali vibrazioni, le quali possono raggiungere elevate distanze, se al di sopra di particolari soglie di intensità, possono causare danni temporanei o permanenti, di natura fisiologica o comportamentale, alle forme di vita acquatiche circostanti il sito di collocamento dell’elemento strutturale. Tuttavia, diverse soluzioni sono state ideate per ridurne gli effetti nocivi: una di queste è il sistema

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DVOŘÁK, Hynek. "Hlukové emise v chovu prasnic." Master's thesis, 2016. http://www.nusl.cz/ntk/nusl-251700.

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This thesis focuses on the noise pollution in sow farming. The first part of the thesis theoretically examines topics concerning noise, sow farming and a proper agricultural practice. The other part of the thesis introduces the aim of the work, describes the measuring technology, the locations objects and the method of the whole measuring process. The obtained values are later on shown in the form of graphs and compared with the hygienic limits. With the occurrence of any violation of these limits, an anti-noise action is suggested.

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SKALIČKA, Jiří. "Vliv rychlosti mobilních energetických prostředků na hladinu akustického tlaku." Master's thesis, 2015. http://www.nusl.cz/ntk/nusl-203326.

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The thesis is focused on evaluating of noise pollution environment of mobile energy devices of various classes with respect to the speed of mobile the energy resource. The first part oft eoretical research focuses on the physical properties of noise and effect on people. The second part describes the reasons for noise, its intensity at the mobile energy resources with its average values. In the practical part are performed measurement of noise emissions with the surrounding environment. There is suggested measures to reduce the noise level, ventually there is recommended optimal operating spee

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LENC, Jan. "Objekty živočišné výroby z hlediska hlukové zátěže okolního prostředí." Master's thesis, 2011. http://www.nusl.cz/ntk/nusl-55471.

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This thesis deals with the evaluation of noise exposure in the agricultural cooperative Hosín ? Dobrejovice. The aim of this work was to measure noise levels in the dairy barn area and its surroundings, during these processes work: milking, feeding, removal of excrement, bedding etc. Measurements were carried out in summer and autumn. During the measurement noise was the largest source of agricultural equipment. The results revealed that noise pollution resulting from the operation of agricultural cooperatives Dobrejovice is fair and negative influence on noise pollution does not occur.

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LIN, BING-KUN, and 林炳坤. "A study on equivalent sound level prediction model of road traffic noice." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/38013415809563518947.

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Yang, Li-Wei, and 楊力威. "A Study of Condenser Microphone for Maximum Sound Pressure Level." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/91283347465860857814.

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碩士<br>國立雲林科技大學<br>電機工程系<br>104<br>The study focuses on increasing the maximum Sound Pressure Level (SPL) of the condenser microphone. Microphone is a commonly use device, especially for the celebrities, actors, and performers. It plays an important role during a performance. However, it would be so unfortunate that, during the climax of a performance or a speech, the user’s voice is limited due to the maximum SPL of the microphone is not sufficient. Therefore, with the purpose of enlarging the dynamic range, the study aims to increase the SPL of the condenser microphone through investigating a

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Lin, Zhi-Hong, and 林志鴻. "A study on equivalent sound level prediction model and assessment indica tor for railway noise." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/31883633662006757429.

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Liu, Yen-Ming, and 劉彥銘. "Simulation of the Sound Pressure Level of a Miniature Loudspeaker by Coupled BEM-FEM." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/39566467531771946053.

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碩士<br>逢甲大學<br>電聲碩士學位學程<br>99<br>As one of the crucial criteria to judge its performance, the sound-pressure-level (SPL) of a loudspeaker is mostly modeled by the equivalent-circuit method (ECM) or the finite element method (FEM). Despite the extensive applications of the ECM in this modeling, its SPL modeling at the mid-high to high frequencies, ranging about from 1k to 20k (Hz), is not so ideal due to modal splits of the membrane. On the FEM modeling, considerable amounts of computational efforts shall be required due to the 3D modeling of unsymmetrical acoustic field. For this, this has been

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STEJSKAL, Jiří. "Hlukové emise v chovu kuřat na výkrm." Master's thesis, 2016. http://www.nusl.cz/ntk/nusl-263267.

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The thesis is focused on the sources of noise in agricultural operations in terms of noise emissions. Agricultural operation in this case was a hall for fattening chickens for meat. The main goal is practical to measure all sources of noise generated during the various operations fattening. The work was primarily necessary to choose suitable habitats for measuring noise sources and measurements of climatic conditions. Followed by calculation of equivalent noise levels and evaluation under applicable legislation. As part of the work was proposed noise protection measures, which would partly hel

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Ma, Chia-Chun, and 馬嘉駿. "A Study on the Model of Sound Pressure Level by Frequency Band of Aircraft Noise under Air Lanes near Sung-Shan Airport." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/17691823365928891324.

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Tsai, Yu-Fei, and 蔡渝斐. "Development of Measuring and Analysis Systems of Speakers Applied to the Measurement of Voice-Coil Impedance, Diaphragm Vibration, TS Parameters and Sound Pressure Level." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/dzwwyg.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>105<br>With the vigorous development of technology, speakers have become an indispensable part of human society. Especially in recent decades, the quality of electro-acoustic products have become more demanding than ever along with the progression of consumer electronics products. The working principle of speakers is quite simple, but to satisfy different needs is still worthy of research. To design high-quality speakers, the measurement of speaker characteristics is crucial. The main content of this thesis is to develop a speaker measuring system is to replace prof

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BÁRTŮ, Lukáš. "Zemědělské provozy a jejich vliv na životní prostředí." Master's thesis, 2015. http://www.nusl.cz/ntk/nusl-188390.

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The thesis focuses on agricultural activities in terms of their noise influence and impact on the environment. Agricultural activities are in this particular thesis biogas plant, dryer of agricultural commodities and stable of young cattle. The aim of the thesis is the noise measurement in different areas at two different seasons vegetation season and non-vegetation season. The thesis focused on selection of appropriate locations for measurement, noise measurement nearby to the noise polluting source, noise pollution by the nearest habitation and measurement of climatic conditions. These measu

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Moussa, Karim. "Computational Modeling of Propeller Noise: NASA SR-7A propeller." Thesis, 2014. http://hdl.handle.net/10012/8446.

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The aerospace industry has been concerned with propeller noise levels for years. This interest is two-fold: government regulation and comfort in cabin. This report attempts to create a simulation mechanism needed to evaluate the far-field noise generation levels. However, in order to do that, the tandem cylinder case was evaluated first as a validation step before the SR-7A propeller case was performed. Both cases use STAR-CCM+, a commercial software, to perform the simulations.

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Dimoff, Sean. "Insight into coral reef ecosystems: investigations into the application of acoustics to monitor coral reefs and how corallivorous fish respond to mass coral mortality." Thesis, 2021. http://hdl.handle.net/1828/12666.

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Coral reefs around the world are threatened by a variety of sources, from localized impacts, including overfishing and coastal development, to global temperature increases and ocean acidification. Conserving these marine biodiversity havens requires both global and local action informed by scientific research. In this thesis, I use data collected from the coral reefs around Kiritimati atoll (Republic of Kiribati) in the central equatorial Pacific, first to assess the applicability of two common metrics used in passive underwater acoustic research, and second to examine the effects of a marine

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Балдина, А. А., та A. A. Baldina. "Оптимизация параметров реверберационной камеры для акустических испытаний : магистерская диссертация". Master's thesis, 2019. http://hdl.handle.net/10995/79352.

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Диссертация посвящена исследованию акустических характеристик реверберационной камеры. Проведены измерения звукового давления с целью исследования звукового поля в помещениях низкого и высокого уровня реверберационной камеры. Для определения диффузности поля были проведены измерения звукового давления в точках, равномерно рассредоточенных по площади камер на четырех уровнях по высоте. Исследование времени реверберации проводилось с использованием метода прерываемого шума и фиксации измерительным прибором кривой спада. Для установления характерной корреляционной связи между уровнем звукового да

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Täschner, Dirk. "Untersuchungen der akustischen Wirkung von Tragrollen zur zielgerichteten Lärmminderung an Gurtförderanlagen." Doctoral thesis, 2013. https://tubaf.qucosa.de/id/qucosa%3A23110.

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Gurtförderanlagen werden im Bergbau und anderen Industriezweigen zum Transport von Schüttgütern eingesetzt. Der Anlagenbetrieb ist mit Geräuschemissionen verbunden. Dies kann bei Kontrolle und Wartung eine erhöhte Lärmbelastung für betroffene Mitarbeiter hervorrufen. Im Umfeld von Wohnbebauungen oder schutzbedürftigen Objekten kann die Überschreitung von Immissionsrichtwerten zu einer zeitlichen Betriebseinschränkung der hocheffizienten Anlagen führen. Zur Lärmminderung an der Quelle oder deren Nähe erfordert dies technische Schallschutzmaßnahmen. Die Tragrollen im Obertrum der Gurtförderanl

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KLEČACKÝ, Ondřej. "Vliv režimu práce motoru mobilních energetických prostředků na hladinu akustického tlaku." Master's thesis, 2015. http://www.nusl.cz/ntk/nusl-203327.

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The diploma thesis is focused on analysis of noise level of mobile power vehicles in relation to motor operation mode and its evaluation. The thesis core lies within measurement of acoustic pressure levels at four vehicles in different motor operation modes by two audio-noise meters. One meter was places within the cabin, the other outside. The results of the work showed a development in reducing noise at modern power vehicles.

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