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Tytuł:
Fourier expansion solution for a switched shunt control applied to a duct
Rozwiązanie Fouriera dla przewodu akustycznego z bocznikującym układem sterowania
Autorzy:
Ameduri, S.
Ciminello, M.
Powiązania:
https://bibliotekanauki.pl/articles/280041.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
synchronised switched shunt control
piezoelectric
pressure sound level
Opis:
In the present work, a semi analytic approach aimed at estimating the effects on reduction of the pressure sound level by synchronised switched shunt logic is described. The displacement field within a 1D longitudinal air column through a Fourier series expansion has been formalised by assigning a sinusoidal perturbation and fluid-structure interface condition on the left and right boundaries, respectively. To simulate the no control operative condition, the solution has been computed for the entire time domain, keeping invariant all circuitry properties; then for the switch working modality, the solution has been computed by splitting the entire time domain into partitions; for any partition, specific circuitry properties (e.g. piezo voltage, electrical field...) have been selected. Based on the displacement information, the related sound pressure level has been compared for no controlled and controlled operative conditions, with and without signal amplification.
W pracy zaprezentowano pół-analityczne rozwiązanie zagadnienia redukcji poziomu ciśnienia akustycznego w przewodzie za pomocą zsynchronizowanej metody bocznikowania. Opis pola przemieszczeń wewnątrz jednowymiarowej kolumny powietrza sformalizowano rozwinięciem w szereg Fouriera przy uwzględnieniu sinusoidalnie zmiennych zaburzeń na prawym i lewym brzegu przewodu. Dla przypadku z wyłączonym układem sterowania rozwiązanie obliczono w całej dziedzinie czasu przy utrzymaniu stałych parametrów obwodu elektrycznego, natomiast dla trybu sterowanego dokonano analizy, dzieląc przedział czasu na fragmenty. W każdym z nich charakterystyczne cechy układu sterowania (np. napięcie przykładane do piezoelektryków, natężenie pola elektrycznego...) dobrano w odpowiedni sposób. Na podstawie obserwacji przemieszczeń porównano poziom ciśnienia akustycznego dla warunków z wyłączonym i włączonym sterowaniem oraz z i bez wzmocnienia sygnału.
Źródło:
Journal of Theoretical and Applied Mechanics; 2010, 48, 2; 479-504
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of noise transmission of a machine tool enclosure
Autorzy:
Bleicher, Friedrich
Reichl, Christoph
Linhardt, Felix
Wimberger, Peter
Habersohn, Christoph
Krall, Stephan
Powiązania:
https://bibliotekanauki.pl/articles/99968.pdf
Data publikacji:
2019
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
sound pressure level
machine enclosure
noise transmission
acoustic grid
Opis:
Machine tools are highly integrated mechatronic systems consisting of dedicated mechanic design and integrated electrical equipment – in particular drive systems and the CNC-control – to realize the complex relative motion of tool towards work piece. Beside the process related capabilities, like static and dynamic stiffness as well as accuracy behavior and deviation resistance against thermal influence, safety aspects are of major interest. The machine tool enclosure must fulfill multiple requirements like retention capabilities against the moving parts of broken tools, lose work pieces or clamping components. In regular use, the noise emission have to be inhibited at the greatest possible extent by the machine tool enclosure. Nevertheless, the loading door and the moving parts of the workspace envelope are interfaces where noise transmission is harder to be avoided and therefore local noise emissions increase. The aim of the objective investigation is to analyse the noise emission of machine tools to determine the local noise transmission of a machine tool enclosure by using arrays of microphones. By the use of this measuring method, outer surfaces at the front, the side and on the top of the enclosure have been scanned. The local transient acoustic pressures have been recorded using a standard noise source placed on the machine table. In addition, an exemplary manufacturing process has been performed to analyse the frequency dependent location resolved sound emissions.
Źródło:
Journal of Machine Engineering; 2019, 19, 3; 5-16
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical Possibilities of Reducing the Sound Pressure Level Emitted into the Environment by a Power Transformer
Autorzy:
Borucki, S.
Boczar, T.
Cichoń, A.
Powiązania:
https://bibliotekanauki.pl/articles/177473.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power transformer
corrected sound pressure level
noise
modernization
Opis:
The subject presented in this paper refers to measurements and assessment of the corrected sound pressure level values (noise) occurring around a medium-power transformer. The paper presents the values of noise accompanying the operation of the power object before and after its modernization, which consisted in repeated core pressing and replacement of the cooling system. The main aim of the research work was the assessment of the influence of the repair work on the noise level emitted into the environment.
Źródło:
Archives of Acoustics; 2011, 36, 1; 49-56
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Analysis Using Sound Level Meter to Determine the Period of Usage of the Spindle Bearing of a Radial Drilling Machine
Autorzy:
Charles, S.
Vijaya, Joslin D.
Powiązania:
https://bibliotekanauki.pl/articles/176769.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
acoustical condition monitoring
radial drilling machine
spindle bearing
sound level meter
sound pressure level
sound muting transducer
Opis:
The condition monitoring techniques like acoustic emission, vibration analysis, and infrared thermography, used for the failure diagnosis of bearings, require longer processing time, as they have to per form acoustical measurement followed by signal processing and further analysis using special software. However, for any bearing, its period of usage can be easily determined within an hour, by measuring the bearing sound, using sound level meter (SLM). In this paper the acoustical analysis of the spindle Bering of a radial drilling machine was performed using SLM, by measuring the sound pressure level of the bearing in decibels, for different frequencies, while muting all the other noises. Then using an experimental set up, two database readings were taken, one for new bearing and the other for completely damaged bearing, both are SKF6207, which itself is the spindle bearing. From these three sets of sound pressure level readings, the period of usage of the spindle bearing, was calculated using an interpolation equation, by substituting the life of the bearing from the manufacturer’s catalogue. Therefore, for any machine with a SKF6207 bearing, its usage time can be estimated using the database readings and one measurement on that machine, all with the same speed.
Źródło:
Archives of Acoustics; 2019, 44, 3; 505-510
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laboratoryjne badania tłumienia dźwięków uderzeniowych przez podłogi pływające z pojedynczą oraz podwójną warstwą sprężystą
Laboratory measurements of the reduction of transmitted impact noise by modified floor covering with single or double resilient layer
Autorzy:
Dulak, L.
Marchacz, M.
Żuchowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/362617.pdf
Data publikacji:
2015
Wydawca:
Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:
wskaźnik delta Lw
izolacyjność od dźwięków uderzeniowych
znormalizowany poziom uderzeniowy
materiały z recyklingu
delta Lw indicator
impact sound insulation
impact sound pressure level
recycled materials
Opis:
W pracy podjęto próbę określenia możliwości poprawy właściwości dźwiękoizolacyjnych podłóg pływających z warstwą sprężystą w postaci polistyrenu ekspandowanego elastyfikowanego pochodzącego z recyklingu.
The paper attempts to identify the possibilities to improve the sound insulation properties by floor coverings with an elastic layer in the form of elasticised expanded polystyrene from recycling.
Źródło:
Fizyka Budowli w Teorii i Praktyce; 2015, T. 7, nr 1, 1; 29-32
1734-4891
Pojawia się w:
Fizyka Budowli w Teorii i Praktyce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terenowe badania poziomu dźwięków uderzeniowych przenikających z pomieszczeń komunikacji ogólnej
Field measurement of impact sound insulation of staircase
Autorzy:
Dulak, L.
Żuchowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/362720.pdf
Data publikacji:
2017
Wydawca:
Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:
akustyka budowlana
poziom uderzeniowy znormalizowany
dźwięk uderzeniowy
klatki schodowe
building acoustics
normalized impact sound pressure level
impact sound
staircase
Opis:
W artykule przedstawiono wyniki pomiarów terenowych dotyczących poziomu dźwięków uderzeniowych przenikających do pomieszczeń mieszkalnych z pomieszczeń komunikacji ogólnej (podestów i biegów schodowych). Badania dotyczą wybranych układów pomieszczeń w budynkach wielorodzinnych i obejmują konstrukcję schodów wykonanych bez użycia elementów dźwiękoizolacyjnych oraz przypadek, w którym zastosowano takie rozwiązania. Na podstawie porównania uzyskanych wyników podjęto próbę oceny skuteczności rozwiązań wibroakustycznych oraz wpływu jakości robót wykończeniowych na stopień realizacji ochrony przed hałasem w pomieszczeniach mieszkalnych.
The article presents the results of field measurements of impact sound insulation of staircase in residential buildings. The authors compared the results of L'n,w in the stairs with the sound insulation system and the results for stairs without acoustic elements. The authors attempted to evaluate the impact of executive defects on acoustic insulation.
Źródło:
Fizyka Budowli w Teorii i Praktyce; 2017, T. 9, nr 2, 2; 5-8
1734-4891
Pojawia się w:
Fizyka Budowli w Teorii i Praktyce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation and Analysis of Environmental Noise Pollution in Seven Major Cities of India
Autorzy:
Garg, N.
Sinha, A. K.
Dahiya, M.
Gandhi, V.
Bhardwaj, R. M.
Akolkar, A. B.
Powiązania:
https://bibliotekanauki.pl/articles/177396.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
NANMN
National Ambient Noise Monitoring Network
day equivalent level
Lday
night equivalent level
Lnight
day-night average sound level
Ldn
equivalent continuous sound pressure level
LAeq,24h
Opis:
The paper describes the noise monitoring data acquired from the pilot project on the establishment of National Ambient Noise Monitoring Network (NANMN) across seven major cities in India for continuous noise monitoring throughout the year. The annual average Lday (06–22 h) and Lnight (22–06 h) values observed in year 2011–2014 for the 35 locations under study in which 14 locations are in commercial zone, 5 in Industrial, 7 in residential and 9 in silence zones are described. The long-term noise monitoring shows that ambient noise levels have marginally increased for 29 sites (82.9%) since past four years. The present study is focused on evaluation and analysis of environmental noise pollution at 35 noise monitoring sites in seven major cities of India and shall be instrumental in planning for the noise abatement measures for controlling the noise pollution in these sites.
Źródło:
Archives of Acoustics; 2017, 42, 2; 175-188
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D Multi-Domain MFS Analysis of Sound Pressure Level Reduction Between Connected Enclosures
Autorzy:
Godinho, L.
Branco, F. G.
Mendes P., A.
Powiązania:
https://bibliotekanauki.pl/articles/177013.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Method of Fundamental Solutions (MFS)
domain decomposition
closed spaces
sound pressure level reduction
Opis:
In this paper, the authors study the 3D propagation of sound waves between two closed spaces. The separation element between the two rooms is considered to include either a small opening or a homogeneous lightweight panel, coupling the two spaces. A numerical study of this configuration is performed, trying to understand the influence of the position and geometry of this opening in the sound pressure level reduction curve at low and midfrequencies. Additionally, the coupling effect between the two acoustic spaces is analyzed, in order to better understand its importance when determining the sound pressure level reduction. Different boundary conditions are ascribed to the walls of these rooms, simulating both the completely reflecting and partially absorbing surfaces. The numerical modelling was performed using a multi-domain formulation of the Method of Fundamental Solutions (MFS). The system is composed of two coupled rooms, limited by rigid or by absorbing walls, and separated by a thin wall (tending to null thickness) with a small opening. An experimental validation of the proposed model is presented, comparing its results with those found experimentally for a reduced-scale model. It is important to note that, for such a configuration, a traditional single-domain approach using methods like the MFS or the BEM would lead to undetermined equation systems, and thus the proposed model makes use of a domain decomposition technique.
Źródło:
Archives of Acoustics; 2011, 36, 3; 575-601
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration transmission analysis through mounting elements of wall cladding panels
Autorzy:
Idczak, Julia
Rubacha, Jarosław
Kamisiński, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/2202419.pdf
Data publikacji:
2022
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
impact sound
transfer function
sound pressure level
transmission path
dźwięk uderzeniowy
transmitancja operatorowa
poziom ciśnienia akustycznego
ścieżki transmisji
Opis:
Vibrations in building constructions may propagate through mounting elements to wall cladding panels. It is confirmed that they can have an impact on the sound pressure level radiated from panels and might have a significant influence on the total SPL in a room. In this work possibilities for calculating a parameter determining a change of SPL value depending on the number of panels and its mounting method are presented. A computational model based on vibration velocity measurements was used to estimate the total SPL value in a room. The laboratory and in situ measurements are presented. Transfer function for two elastic elements used as additional elements in a junction was calculated. Finally, ΔLp and ΔLv were calculated, as parameters defining the impact of various panel mounting methods on the reduction of sound pressure level and vibration level value, respectively.
Źródło:
Vibrations in Physical Systems; 2022, 33, 2; art. no. 2022207
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Localization of noise sources in electric cookers based on sound pressure and intensity measurements
Autorzy:
Jakubek, Bartosz
Barczewski, Roman
Tabaszewski, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/127684.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
electric cooker
acoustic pressure
sound intensity
noise source localization
kuchenka elektryczna
ciśnienie akustyczne
natężenie dźwięku
lokalizacja źródeł hałasu
Opis:
The main aim of the study was to compare the features of acoustic maps created on the basis of measurements of sound pressure and intensity in a near acoustic field. Data for comparisons were obtained within the framework of acoustic tests of electric cookers. The results of these studies may help in the selection of acoustic mapping and optimization methods according to individual needs and/or requirements concerning selectivity, measurement bandwidth, dynamics and the ability to locate sound-emitting areas. The paper also presents the results of the spectral analysis of the dominant sources of noise in the cooker, which was helpful in identifying and locating paths of noise propagation from the inside of the cooker.
Źródło:
Vibrations in Physical Systems; 2019, 30, 2; 1-14
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and Optimization of Micro Speaker-Box Using a Passive Radiator in Portable Device
Autorzy:
Jiang, Y.-W.
Kwon, J.-H.
Kim, H.-K.
Hwang, S.-M.
Powiązania:
https://bibliotekanauki.pl/articles/176530.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
passive radiator
speaker box
SPL improvement
Sound Pressure Level
Opis:
With the rapid development of multimedia devices such as smart phones and tablet PCs, microspeakers have been recently increasingly used for audio equipment. Improving the acoustic performance of a microspeaker is always a main concern, especially in the low frequency range. To avoid sound cancelation, a microspeaker unit is usually inserted into a speaker box. A passive radiator is also used in speaker boxes to improve the sound performance in the loudspeaker system. However, passive radiators have not been applied into microspeaker system. In this study, a speaker box with a passive radiator was analyzed and optimized to achieve a higher Sound Pressure Level (SPL) in a microspeaker system. The Finite Element Method (FEM), two-degree-of-freedom (DOF) vibration theory, and a plane circular piston sound source were used to study the electromagnetic, vibration, and acoustic characteristics, respectively. Optimization was conducted by changing the mass, stiffness, and size of the passive radiator. Based on the optimized parameters, a new sample was manufactured. The experiment results show that the SPL of the optimized speaker box with a passive radiator is improved by 5 dB at 200 Hz compared with the one without a radiator. The analysis results also matched the experiment results.
Źródło:
Archives of Acoustics; 2017, 42, 4; 753-760
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of the Noise Emitted by Machine Tools in Industrial Conditions
Autorzy:
Józwik, J.
Wac-Włodarczyk, A.
Michałowska, J.
Kłoczko, M.
Powiązania:
https://bibliotekanauki.pl/articles/123074.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
noise monitoring
measurement
sound pressure
CNC machine tools
Opis:
The paper presents an analysis of noise emitted by selected machine tools in a production hall (under industrial conditions). Noise monitoring is a fundamental task for maintaining workplaces which are safe and healthy. This paper presents the noise measurements obtained for several machine tools, performed in accordance with the PN ISO 230–5:2002 standard. The identification of noise sources and levels was conducted by means of the UNIT 352 measurement system for DMU 50, BGO-CNC/RV/R, FU 251, FW 801, FWC 25/H. Detection of noise sources in the tested machine tools allows to maintain safety of workers and effective means of noise reduction, which are highly significant from the perspective of minimising noise at various workstations. The method of performing noise measurements at workstations using specific machines is normalised, so that the results of such measurements for different machines could be compared. The test results were presented in the form of diagrams and tables. The results of the tests are concluded by a detailed recommendation for the CNC machine tool operators to use hearing protection when at work. The results showed that the level of noise at the operator’s workstation significantly exceeds the standard at certain machining parameters.
Źródło:
Journal of Ecological Engineering; 2018, 19, 1; 83-93
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental analysis of noise and vibration of a diesel engine
Autorzy:
Kilikevičienė, K.
Fursenko, A.
Kilikevičius, A.
Vainorius, D.
Matijošius, J.
Rimkus, A.
Bereczky, A.
Powiązania:
https://bibliotekanauki.pl/articles/245124.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
biodiesel
compression ignition engine
engine vibration
sound pressure level
silnik wysokoprężny
wibracje silnika
poziom ciśnienia akustycznego
Opis:
Noise and vibration of ignition compression engine is one of the most complicated fields to cope with since every mechanism that compose of the engine affect them separately. In this study, effect of diesel on engine noise and vibration has been studied on an unmodified compression ignition engine. Noise and vibration characteristic of a direct ignition engine, which was fuelled with diesel, were investigated. With the usage of equations obtained from regression analysis, estimation of engine characteristic fuelled with various biodiesels researches were carried out. Tests were conducted at fixed injection timing of diesel fuel. The first system is for diesel fuel injection; the second one is PFI (port-fuelled injection) and is used for injecting alcohol into the engine intake manifold. The engine applied to this study was a naturally aspirated, 3in-line, IVECO AIFO 8031 i06.05 diesel engine with direct injection. Experiments were conducted in a sound insulated room. For each experiment, vibration data gathered from the engine block with 3.2 kHz (for vibration) for 2 s and with 20 kHz sampling frequency for 0.320 s. All measurements were performed under conditions: angle 10; 4 different loads (4, 8, 12 and 20 kW).
Źródło:
Journal of KONES; 2018, 25, 1; 225-232
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power affects to the sound pressure of a four-stroke engine
Autorzy:
Kilikevičienė, Kristina
Kilikevičius, Artūras
Matijošius, Jonas
Rimkus, Alfredas
Powiązania:
https://bibliotekanauki.pl/articles/263213.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
S320 Andoria internal combustion engine
sound pressure
engine power
Opis:
The noise generated by the four-stroke S320 Andoria internal combustion engine is a complex field of study because the total sound pressure is the sum of the sound pressures produced by each engine component. The noise level and sound frequency of diesel engines used in agricultural machinery are highly dependent on fuel combustion. The standard diesel fuel conforming to EN 115 was used in the tests. Sound pressure was measured with the Bruel & Kjear equipment. Investigations show the dynamics of the dynamic parameters of the four-stroke engine, which must be evaluated when operating agricultural machinery. Experimental research of power influence on sound pressure of four-stroke diesel engine was performed. The dependence of the sound pressure level on the variation of the motor power was determined. Studies have shown that as the engine power increases from 2.63 to 9.48 kW, the sound pressure standard deviation increases by about 0.041 Pa.
Źródło:
Archiwum Motoryzacji; 2019, 86, 4; 143-150
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic noise generation under plunging breaking waves
Autorzy:
Klusek, Z.
Lisimenka, A.
Powiązania:
https://bibliotekanauki.pl/articles/48445.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
wave breaking
acoustic noise
noise emission
energy dissipation
dynamic process
acoustic pressure
wave energy
temporal change
sound pressure
Źródło:
Oceanologia; 2013, 55, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
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