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Wyszukujesz frazę "noise control" wg kryterium: Temat


Tytuł:
From the History of the Noise Control Conference
Autorzy:
Engel, Z. W.
Powiązania:
https://bibliotekanauki.pl/articles/177984.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
noise control
history of the noise control conference
noise threats
Opis:
In the article a short historical outline of noise control conferences organized in Poland is given. Those conferences with the participation of Polish specialists have been organized since 1964; since 1976 they have been evolved into International Noise Control Conferences. Silhouettes of four Polish scientists, which have made a large contribution to the noise and vibration control in Poland, are presented. Also the current state of threats by noise and vibrations have been briefly mentioned. The significance of such conferences has been emphasized.
Źródło:
Archives of Acoustics; 2010, 35, 2; 133-144
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Primary Noise Control in the Work Environment by Increasing the Quality of Bearings and Effective Mounting of Machines
Autorzy:
Žiaran, Stanislav
Šooš, Ľubomír
Chlebo, Ondrej
Powiązania:
https://bibliotekanauki.pl/articles/177903.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
noise control
vibroacoustics
vibroisolation
human
measures
Opis:
Implementation of European directives is closely related to the quality of production and the associated operational safety, maintenance of machines and mechanical systems, both mobile or stationary, in order to reduce the dynamic load (vibration and noise) on the working environment, not only during their operating state but also during their design, production, and setting of the vibration isolation components. Reducing the dynamic load of mechanical systems and their components is reflected in the working environment by reduced emissions and immissions of noise and vibration. The presented paper investigates the methods and conditions for noise and vibration control, focusing mainly on increasing the quality of rotating machine components, such as bearings by means of effective vibration isolation of the machines. The solution of this problem requires theoretical analysis and methodology for the measurement of the mechanical systems involved. The results of the vibroacoustic measurements were analysed in terms of the low frequency vibration and noise level (quality) of bearings and conditions for effective vibration isolation of the machines using vibroacoustic diagnostic method. Furthermore, the impact on the working environment was also analysed. Finally, the paper suggests some actions to be taken to effectively reduce the unwanted vibrosound energy in working places, also using recycled material as a vibration isolation element.
Źródło:
Archives of Acoustics; 2020, 45, 2; 253-262
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Study of Behavior of Vibrating Systems Controllable by Devices with Rheological Fluid
Autorzy:
Szary, M. L.
Weber, P.
Powiązania:
https://bibliotekanauki.pl/articles/177066.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
noise control
vibration control
smart materials
rheological fluids
Opis:
The nonlinear mathematical model of behavior of controllable viscosity fluid (CVF) under applied external field is presented. A large family of these fluids is commonly used to control responding forces of dampers in vibration control applications. The responding force of a damper with CVF has two components. The first one - uncontrollable - is proportional to the viscosity of a base fluid and velocity of its motion, the second one, which is controllable, depends on the strength of the applied external field. Both are involved in the process of dissipation of unwanted energy from the vibrating systems. An equivalent damping factor based on the principle of energy dissipated during one cycle of damper work under a constant strength external field was calculated. When mass or stiffness is variable the equivalent damping factor can be set accordingly by adjusting the strength of external field to have vibrating damped system purposely/continuously working in the critical or other chosen state. This paper also presents cases of applying periodically changing strengths of an external field synchronized with cycles of periodical motion of the vibrating system to continuously control the damping force within each cycle.
Źródło:
Archives of Acoustics; 2013, 38, 2; 217-222
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prohibition of the use of sound systems and equipment - article 156 of the Environmental Protection Act
Autorzy:
Niewiarowska, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/1933051.pdf
Data publikacji:
2020-01-20
Wydawca:
Wyższa Szkoła Policji w Szczytnie
Tematy:
environmental protection
noise
noise control
sound equipment
sound systems
Opis:
Article 156 of the Environmental Protection Act prohibits the use of sound systems or equipment in publicly accessible areas of towns, built-up areas and areas intended for recreation and leisure purposes. This prohibition results directly from the law and does not require a separate interpretation, e.g. in the form of an administrative decision. However, its application in practice can be troublesome due to interpretation difficulties caused by the fact that the terms used in the regulation are not directly defined by the applicable law. The author discusses the subjective and objective scope of the prohibition, pointing to examples of judicial decisions, and indicating the consequences of its violation.
Źródło:
Przegląd Policyjny; 2019, 135(3); 219-230
0867-5708
Pojawia się w:
Przegląd Policyjny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Frequency Noise Attenuation in a Closed Space Using Adaptive Directivity Control Sources of a Quadrupole Type
Autorzy:
Giouvanakis, Marios
Sevastiadis, Christos
Papanikolaou, George
Powiązania:
https://bibliotekanauki.pl/articles/176748.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
modal field
noise control
adaptive radiation sources
Opis:
A novel method of active noise control using adaptive radiation sound sources is investigated. A finite element model of a modal enclosed sound field is excited harmonically, representing a noise field in the low-frequency range. The control sources are comprised of elementary dipole sources for which the driving signals are adjusted by an optimization method. Two set-up cases of the proposed compound sources are investigated. The coupling of the control sources with the modal sound field is discussed. The simulated performance of the proposed method is compared with that of a system with distributed simple sources and the results show the effectiveness of the sources with adaptive radiation for active noise control in small enclosures.
Źródło:
Archives of Acoustics; 2019, 44, 1; 71-78
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decision Support System for Designing Effective Noise Hazard Prevention Strategies
Autorzy:
Asawarungsaengkul, K.
Nanthavanij, S.
Chalidabhongse, J.
Powiązania:
https://bibliotekanauki.pl/articles/90636.pdf
Data publikacji:
2007
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
decision support system
noise hazard prevention
genetic algorithms
noise control
capital budgeting
Opis:
A decision support system for designing effective noise hazard prevention (NHP) strategies is proposed. NHP consists of four modules: (a) database, (b) input, (c) algorithms, and (d) solution. The user can choose among single-, two-, and three-approach solution procedures. Heuristic and genetic algorithms are used to determine appropriate noise controls (NCs). From the given noise condition and NC budget, NHP recommends a minimum-cost NHP strategy that prevents any worker’s daily noise exposure from exceeding the permissible level. If the budget is insufficient, NHP is able to search for a feasible noise hazard strategy that requires a minimum NC budget.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2007, 13, 4; 451-470
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Double-Panel Structure Modification on Vibroacoustical Properties of a Rigid Device Casing
Autorzy:
Chrapońska, Anna
Rzepecki, Jarosław
Mazur, Krzysztof
Wrona, Stanisław
Pawełczyk, Marek
Powiązania:
https://bibliotekanauki.pl/articles/176468.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
noise control
vibration control
double-panel structures
active casing
natural frequencies
modeshapes
Opis:
Nowadays, noise generated by devices is a serious issue in industry and in everyday life, because it may cause health damage to humans. In this research, a cubic rigid device casing built of double-panel thin steel walls is employed to reduce noise emitted from an enclosed noise source. Double-panel structure is used because of good sound insulation it provides. There exist three main groups of noise reduction methods, i.e. passive, semi-active and active. In this paper, a semi-active modification of double-panel structure is applied and examined. The bistable actuator (solenoid) mounted between incident and radiating plates changes its state due to applied constant voltage, causing the coupling of plates. Experimentally measured natural frequencies and modeshapes of the structure are compared to the simulation results. The influence of proposed modification on dynamical properties of the structure is analyzed and discussed.
Źródło:
Archives of Acoustics; 2020, 45, 1; 119-127
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Perception-Based Method for the Noise Control of Construction Machines
Autorzy:
Carletti, E.
Powiązania:
https://bibliotekanauki.pl/articles/176980.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
noise control
acoustic design
sound quality
annoyance
psychoacoustics
construction machines
Opis:
During operation, construction machines generate high noise levels which can adversely affect the health and the job performance of operators. The noise control techniques currently applied to reduce the noise transmitted into the operator cab are all based on the decrease of the sound pressure level. Merely reducing this noise parameter may be suitable for the compliance with the legislative requirements but, unfortunately, it is not sufficient to improve the subjective human response to noise. The absolute necessity to guarantee comfortable and safe conditions for workers, requires a change of perspective and the identification of different noise control criteria able to combine the reduction of noise levels with that of psychophysical descriptors representing those noise attributes related to the subjective acoustical discomfort. This paper presents the results of a study concerning the “customization” of a methodology based on Sound Quality for the noise control of construction machines. The purpose is to define new hearing-related criteria for the noise control able to guarantee not only reduced noise levels at the operator position but also a reduced annoyance perception.
Źródło:
Archives of Acoustics; 2013, 38, 2; 253-258
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Intensity Imaging Methods for in-situ Wave Propagation
Autorzy:
Weyna, S.
Powiązania:
https://bibliotekanauki.pl/articles/177914.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
scientific visualization
acoustic mapping
wave propagation
sound intensity
noise control
Opis:
In the paper the author has described the visualization methods in acoustic flow fields and show how these methods may assist scientists to gain understanding of complex acoustic energy flow in real-life field. A graphical method will be presented to determine the real acoustic wave distribution in the flow field. Visualization of research results, which is unavailable by conventional acoustics metrology, may be shown in the form of intensity streamlines in space, as a shape of floating acoustic wave and intensity isosurface in three-dimensional space. In traditional acoustic metrology, the analysis of acoustic fields concerns only the distribution of pressure levels (scalar variable), however in a real acoustic field both the scalar (acoustic pressure) and vector (the acoustic particle velocity) effects are closely related. Only when the acoustic field is described by both the potential and kinetic energies, we may understand the mechanisms of propagation, diffraction and scattering of acoustic waves on obstacles, as a form of energy image. This attribute of intensity method can also validate the results of CFD/CAA numerical modeling which is very important in any industry acoustic investigations.
Źródło:
Archives of Acoustics; 2010, 35, 2; 265-273
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tłumienie dźwięku hełmofonu czołgisty
Sound attenuation of tanker’s headphone
Autorzy:
Młyński, R.
Kozłowski, E.
Powiązania:
https://bibliotekanauki.pl/articles/210392.pdf
Data publikacji:
2015
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
akustyka
ochrona przed hałasem
hałas
tłumienie dźwięku
acoustics
noise control
noise
sound attenuation
Opis:
Załoga pojazdu bojowego, która jest narażona na hałas związany z pracą silnika, jak i z wystrzałami z broni palnej, ma na swoim wyposażeniu hełmofony. W artykule przedstawiono wyniki badań ograniczania hałasu przez hełmofon HC-98 w przypadku hałasu ustalonego oraz impulsowego. Stosowano dwie metody badań: pomiary tłumienia dźwięku z udziałem osób oraz pomiary tłumienia przenoszenia impulsów akustycznych przeprowadzane z użyciem testera akustycznego - urządzenia odwzorowującego głowę. Dane dla hełmofonu porównano ze skutecznością ograniczania hałasu przez dwa różne, powszechnie stosowane nauszniki przeciwhałasowe (jeden słabo, drugi silnie ograniczający hałas). Wyniki wskazały, że hełmofon spełnia wymagania, które pozwalają traktować go jako ochronnik słuchu, jednak nie zapewnia on ochrony słuchu takiej jak nauszniki przeciwhałasowe. Otrzymano stosunkowo niskie wartości tłumienia impulsów akustycznych przez badany hełmofon względem wyników dla nauszników przeciwhałasowych. Ponadto, w przypadku hełmofonu, w zakresie częstotliwości 63-2000 Hz, uzyskano niższe od około 2 do nawet 19 dB wartości tłumienia hałasu ustalonego w porównaniu z wartościami tłumienia nauszników.
Crew of military vehicles, which is exposed to the noise associated with the engine running, as well as to shots from firearms, is equipped with headphones. The article presents the results of noise reduction by HC-98 headphone for steady state and impulsive noise. Two methods of research were used: sound attenuation measurements with participation of subjects and transmission loss measurements with the use of acoustic test fixture - device reflecting the properties of the head. Data for headphone were compared with noise reduction of two different, commonly used earmuffs (one light, the other strong limiting noise). The results indicated that measured headphone meets the requirements that allow for treating it as hearing protection, however, this headphone does not provide hearing protection such as earmuffs. Relatively low values of attenuation of acoustic impulses through the headphone versus the results for earmuffs were observed. Furthermore, in the case of headphone, in the frequency range 63-2000 Hz, the lower values of steady state noise sound attenuation, from about 2 up to even a 19 dB with respect to the attenuation of ear muffs were measured.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2015, 64, 1; 79-90
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing Noise Control Strategy in a Forging Workshop
Autorzy:
Razavi, H.
Ramazanifar, E.
Bagherzadeh, J.
Powiązania:
https://bibliotekanauki.pl/articles/90448.pdf
Data publikacji:
2014
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
noise control
noise exposure
industrial noise pollution
genetic algorithm
kontrola hałasu
hałas przemysłowy
algorytm genetyczny
Opis:
In this paper, a computer program based on a genetic algorithm is developed to find an economic solution for noise control in a forging workshop. Initially, input data, including characteristics of sound sources, human exposure, abatement techniques, and production plans are inserted into the model. Using sound pressure levels at working locations, the operators who are at higher risk are identified and picked out for the next step. The program is devised in MATLAB such that the parameters can be easily defined and changed for comparison. The final results are structured into 4 sections that specify an appropriate abatement method for each operator and machine, minimum allowance time for high-risk operators, required damping material for enclosures, and minimum total cost of these treatments. The validity of input data in addition to proper settings in the optimization model ensures the final solution is practical and economically reasonable.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2014, 20, 2; 257-264
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rotorcraft thickness noise control
Autorzy:
Szulc, O.
Powiązania:
https://bibliotekanauki.pl/articles/38627396.pdf
Data publikacji:
2021
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
helicopter rotor
aerodynamics
aeroacoustics
CFD
noise reduction
active flow
noise control
surface transpiration
perforation
Opis:
The paper describes an innovative idea of Thickness Noise Control (TNC) based on adoption of a flow control strategy (i.e. surface ventilation) for acoustic attenuation of helicopter rotor periodic noise. The TNC method is relying on incorporation of multiple cavities (closed by perforated panels and linked to low- and high-pressure reservoirs) located in a symmetrical manner at front and rear portions of the blade tip. The efficiency of the new approach is verified using a two-bladed model rotor of Purcell (untwisted variant of the blade of Bell UH-1H Iroquois helicopter) in low-thrust hover conditions. The results of numerical simulations, obtained with CFD solver (Spalart–Allmaras turbulence and Bohning–Doerffer transpiration models), indicate that in the near-field of the blade tip, both the amplitude and spectral contents of pressure impulses of emitted thickness noise are significantly improved. The TNC method, in the proposed unsteady mode of operation, turns out to be a suitable means of thickness noise reduction in forward flight. Moreover, it is demonstrated that by proper azimuthal activation the efficiency is almost unaltered, while the rotor torque penalty and required transpiration mass-flux are decreased by a factor of 3–5 compared to a steady arrangement.
Źródło:
Archives of Mechanics; 2021, 73, 4; 391-417
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Noise Pollution in Metalwork and Woodwork Industries in the Kingdom of Saudi Arabia
Autorzy:
Noweir, M. H.
Bafail, A. O.
Jomoah, I. M.
Powiązania:
https://bibliotekanauki.pl/articles/91079.pdf
Data publikacji:
2014
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
industrial noise
metalwork
woodwork
noise control
Saudi Arabia
hałas przemysłowy
metaloplastyka
kontrola hałasu
Arabia Saudyjska
Opis:
This study was conducted in metalwork and woodwork industries in Jeddah Industrial Estate. The purpose of this study was to assess the magnitude of industrial noise exposure and to propose remedial actions. Noise was measured at different times of a day in 28 randomly selected factories and workshops. Results indicated that noise levels varied according to the type and size of a factory, and the type and number of machines used. Mean noise levels in metalwork factories were higher than those in woodwork factories. The highest noise levels were observed while manufacturing cans and forming steel reinforcement for concrete, where noise levels exceed 90 dB(A). All mean noise levels in all studied metalwork factories and in 50% of studied woodwork industries were higher than the standard level of 85 dB(A).
Źródło:
International Journal of Occupational Safety and Ergonomics; 2014, 20, 4; 661-670
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System aktywnej redukcji hałasu do zastosowania w hełmach strażackich : propozycja rozwiązania
Active noise system in a fire helmet : a proposal of the solution
Autorzy:
Morzyński, L.
Szczepański, G.
Powiązania:
https://bibliotekanauki.pl/articles/180289.pdf
Data publikacji:
2018
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
pojazdy uprzywilejowane
sygnał uprzywilejowania
hałas
aktywna redukcja hałasu
emergency vehicles
auditory waring signal
noise
noise control
Opis:
Akustyczny sygnał uprzywilejowania emitowany przez poruszający się pojazd uprzywilejowania ma za zadanie ^formować pozostałych uczestników ruchu drogowego o zbliżaniu się pojazdu uprzywilejowanego! konieczności Ustąpienia mu pierwszeństwa przejazdu. Głównym sposobem zapewnienia słyszalności i rozpoznawalności sygnału i przywilejowania przez uczestników ruchu drogowego przy nieznanych i zmiennych hałasie ruchu ulicznego, Izolacyjności akustycznej pojazdów oraz hałasie we wnętrzu pojazdu, jest emisja sygnału uprzywilejowania o jak najwyższym poziomie ciśnienia akustycznego. Poziom dźwięku A sygnału uprzywilejowania docierającego do wnętrza pojazdu uprzywilejowanego może przekraczać 90 dB, co oddziałuje niekorzystnie na narząd słuchu i sprawności psychofizyczne członków załogi, jak również znacząco utrudnia porozumiewanie się we wnętrzu pojazdu. W artykule przedstawiono koncepcję budowy i wyniki badań symulacyjnych systemu aktywnej redukcji sygnału uprzywilejowania do zastosowania w hełmach strażackich, który pozwoli ograniczyć narażenie załogi na ten sygnał oraz poprawić jakość komunikacji słownej w pojeździe uprzywilejowanym. System ten jest zintegrowany z układem generacji sygnału uprzywilejowania. W algorytmie sterowania systemu zastosowano filtry Koleb i algorytm adaptacji NLMS. Konstrukcję układu sterującego oparto na mikrokontrolerze z rodziny STM32F4.
An auditory warning signal emitted by a moving emergency vehicle is intended to inform other road users about an approaching emergency vehicle and the need to give way to it. Emission of a warning signal with the highest possible sound pressure level is the main method of ensuring the audibility and recognition of the warning signal by traffic participants at unknown and varying traffic noise, acoustic insulation of vehicles and noise in the interior of the vehicle. The A-weighted sound pressure level of the auditory warning signal reaching the interior of an emergency vehicle may exceed 90 dB, which can be harmful to the hearing, can adversely affect psychophysical fitness of the crew members and can significantly hinder verbal communication in the vehicle. This article presents the concept and results of numerical simulations of an active noise control system in fire helmets, which will reduce the exposure of the crew to the warning signal and improve the quality of verbal communication in an emergency vehicle. This system is integrated with the signal generation system. The Notch algorithm and the NLMS adaptation algorithm were used in the system’s control algorithm. The construction of the controller was based on a microcontroller from the STM32F4 family.
Źródło:
Bezpieczeństwo Pracy : nauka i praktyka; 2018, 3; 11-15
0137-7043
Pojawia się w:
Bezpieczeństwo Pracy : nauka i praktyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sound absorption coefficients of granular materials
Współczynniki pochłaniania dźwięku materiałów ziarnistych
Autorzy:
Sikora, J.
Turkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/369057.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
współczynnik pochłaniania dźwięku
materiały dźwiękochłonne
zwalczanie hałasu
sound absorption coefficient
sound absorbing materials
noise control
Opis:
This paper presents the results of the expanded research program on sound absorbing properties of granular materials (granular polypropylene, foamed polystyrene, gravelite, rubber, mineral wool, and high-silica sand) being often applied as sound absorbing cores in double-wall partitions of constructions limiting noises of machines and devices.
W artykule przedstawiono wyniki rozszerzonego programu badań właściwości dźwiękochłonnych materiałów ziarnistych (granulaty z polipropylenu, styropianu, keramzytu, gumy, wełny mineralnej, piasek kwarcowy) mających zastosowanie jako rdzenie dźwiękochłonne w przegrodach dwuściennych rozwiązań konstrukcyjnych ograniczających hałas maszyn i urządzeń.
Źródło:
Mechanics and Control; 2010, 29, 3; 149-157
2083-6759
2300-7079
Pojawia się w:
Mechanics and Control
Dostawca treści:
Biblioteka Nauki
Artykuł

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