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Tytuł:
Fungal contamination of ward furnishings and medical equipment used in the treatment and nursing of newborns
Autorzy:
Gniadek, A.
Białecka, A.
Opach, I.
Kulig, A.
Krzyściak, P.
Ostrogórska, P.
Macura, A.B.
Powiązania:
https://bibliotekanauki.pl/articles/2085935.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
airborne microorganisms
fungal
medical equipment
Opis:
Introduction and objective. Newborn babies staying on hospital wards are likely to be colonized by microorganisms, including potentially pathogenic fungi. The aim of the study was to assess the mycological purity of hospital wards and medical equipment utilized in the treatment and nursing of newborns. Materials and method. The study was conducted in Neonatal High Dependency Units (NHDU) and Neonatal Intensive Care Units (NICU). 539 samples were collected from 24 different sources, 130 from ward furnishings and 289 from medical equipment. The study was carried out following the microbiology research methods for sample collection. Subsequently, the samples (swabs, water from incubators, washings from respirator tubes and nasal cannulas (nCPAP)) were cultivated on Sabouraud agar plates. The stamps were collected with the application of Count-Tact method. The samples were incubated at the temperature of 25+/-2oC and the number of fungi assessed (cfu/cm-2 of the surface area). The species were identified based on their morphological and biochemical features. Results. Fungal growth was observed on 60% of samples collected from ward furnishings and 7% of samples collected from medical equipment. The average number of cfu/cm-2 ranged between 0–8.84 in the case of ward furnishings and between 0–1.22 cfu/cm-2 in the case of medical equipment. In 180 samples collected from the material which had direct contact with newborns no fungal growth was observed. Conclusions. The furnishings of the wards on which newborns were treated and nursed were contaminated with fungi to an extent which did not pose a threat to the life and health of the newborns. Medical equipment (respirators, incubators, nCPAP cannulas and masks) which came into direct contact with newborns was free from fungi.
Źródło:
Annals of Agricultural and Environmental Medicine; 2020, 27, 3; 348-355
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occupational exposure level of pig facility workers to chemical and biological pollutants
Autorzy:
Chmielowiec-Korzeniowska, A.
Tymczyna, L.
Pyrz, M.
Trawińska, B.
Abramczyk, K.
Dobrowolska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2081683.pdf
Data publikacji:
2018
Wydawca:
Instytut Medycyny Wsi
Tematy:
environmental exposure
airborne contaminant
pig facility
Opis:
Objective. The aim of the study was to assess the impact of a fattening season on the level of airborne chemical and microbial pollutants in the pig fattening house. Materials and method. Evaluation of the air composition as well as the microbiological air quality were made during 2 series, i.e. in the summer and winter period of fattening. Airborne gaseous pollutants were analyzed by gas (organic compounds) and liquid (inorganic compounds) chromatography methods. Air microbial contamination was determined in compliance with the Polish Standard PN-EN 13098:2007. Results. The air/gas composition in the pig unit showed that irrespective of the fattening season, the level of determined pollutants – especially ammonia, volatile organic compounds (VOCs), including methanethiol and total dust – could have an adverse effect on the health of swine facility workers. The investigated pig building was found to be a source of chemical pollutants as well as biological agents. The total bacterial count in 1 m3 of air was 3.6×106 and 4.6×106 cfu, during the winter and summer periods of fattening, respectively. Gram-positive cocci predominated in both seasons. In the winter, fungi of the Trichoderma genus were represented equally often. In the summer period, up to 90% of the isolated fungus was Aspergillus spp. Conclusions. Workers engaged in swine rearing and production are occupationally exposed not only to a high concentration of microbial contamination, but also to irritating and odorogenous volatile compounds. Thus, activities directed at the promotion of health prevention strategies, as well as effective guidelines for safe and hygienic animal housing, should be implemented.
Źródło:
Annals of Agricultural and Environmental Medicine; 2018, 25, 2; 262-267
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elaboration of the 3D Model and Survey of the Power Lines Using Data From Airborne Laser Scanning
Autorzy:
Kwoczyńska, B.
Dobek, J.
Powiązania:
https://bibliotekanauki.pl/articles/124712.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
airborne laser scanning
power lines
survey
Opis:
One of the methods of obtaining highly accurate and current spatial data about the terrain, as well as objects situated on it, is laser scanning. LIDAR (Light Detection and Ranging) is among the most modern, dynamically developing technologies and reveals in surveying new capabilities that have been unachievable in a traditional way so far. The aim of the publication is to show the possibilities of using data from airborne laser scanning to perform the survey and visualization of the energy network, and also identification of hazards which the present network constitutes for the immediate environment using the TerraSolid software package. The survey was conducted for two independent sections of the power line, on the basis of two different clouds of points obtained from the airborne laser scanning. The first one had a density of 16 points/m2, while the other 22 pts/m2. The project was created in an environment of MicroStation V8i software using special overlays – TerraScan and TerraModeler of Finnish TerraSolid Company. The use of the test clouds of different densities was intended to indicate an optimal density of the cloud of points, which allows carrying out a survey and visualization of the energy network based on data derived from airborne laser scanning. The publication presents on particular examples the procedure of vectorization and visualization of the power line and detection of objects within a dangerous distance from it. The possibility of using applied LIDAR data, meeting the industry requirements, to the survey of power lines has been also confirmed.
Źródło:
Journal of Ecological Engineering; 2016, 17, 4; 65-74
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibroacoustic Measurements and Simulations Applied to External Gear Pumps. An Integrated Simplified Approach
Autorzy:
Carletti, E.
Miccoli, G.
Pedrielli, F.
Parise, G.
Powiązania:
https://bibliotekanauki.pl/articles/177641.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
airborne noise
gear pump
vibroacoustic modelling
Opis:
This paper describes the development phases of a numerical-experimental integrated approach aimed at obtaining sufficiently accurate predictions of the noise field emitted by an external gear pump by means of some vibration measurements on its external casing. Harmonic response methods and vibroacoustic analyses were considered as the main tools of this methodology. FFT acceleration spectra were experimentally acquired only in some positions of a 8.5 cc/rev external gear pump casing for some working conditions and considered as external excitation boundary conditions for a FE quite simplified vibroacoustic model. The emitted noise field was computed considering the pump as a ‘black box’, without taking into account the complex dynamics of the gear tooth meshing process and the consequent fluid pressure and load distribution. Sound power tests, based on sound intensity measurements, as well as sound pressure measurements in some positions around the pump casing were performed for validation purposes. The comparisons between numerical and experimental results confirmed the potentiality of this approach in offering a good compromise between noise prediction accuracy and reduction of experimental and modelling requirements.
Źródło:
Archives of Acoustics; 2016, 41, 2; 285-296
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of asbestos separation in soil samples and determination by optical microscope
Autorzy:
Lipiecka, S.
Domaszewicz, A.
Szeflińska, K.
Urbaniak, W.
Powiązania:
https://bibliotekanauki.pl/articles/347011.pdf
Data publikacji:
2010
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
asbestos determination
airborne fibers
microscopic analysis
Opis:
A new method of asbestos determination for quantitative analysis in environmental samples, e.g., soil and water has been developed. The proposed procedure is inexpensive and relatively fast and easy. It can be used e.g. for quantitative determination of asbestos in the soil after the removal of asbestos containing materials for confirmation of the efficiency of work executed. A Polish Patent Application for the procedure of asbestos determination and an analytical set for asbestos determination have been prepared. The analytical set for asbestos determination is based on optical microscopy with optional phase contrast, and is equipped with a digital camera connected to a computer with the appropriate software. The procedure of determination involves leaching the asbestos fibers from the soil and subsequently investigation of leachate by optical microscope. A surface active agent is used for a better leaching of the asbestos fibers. It has been shown, that application of the surface active agent for analysis improves the accuracy of determination. We would like to briefly present the proposed procedure of asbestos determination and the results of studies on the optimization of this procedure, especially in soils.
Źródło:
Ars Separatoria Acta; 2009-2010, 7; 85-98
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Diffusing Elements in a Reverberation Room on the Results of Airborne Sound Insulation Laboratory Measurements
Autorzy:
Mleczko, Dominik
Wszołek, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/177423.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
reverberation room
airborne sound insulation
diffuseness
Opis:
The main problem in the measurement of airborne sound insulation is the measurement of the sound power radiated by the barrier, in practice performed by measuring the sound pressure level and the acoustic absorption in the receiving room. Large variations of the sound pressure level in a reverberation room indicate the presence of dominating strong standing waves, so that it becomes necessary to install diffusing elements. In ISO 10140, the limits have been defined in which the reverberation time at frequencies at and above 100 Hz should be included. Sometimes, however, in the case of rooms with a large volume, obtaining the required parameters is difficult and sometimes even impossible. It should then be checked whether the measured sound insulation depends on the reverberation time. The paper presents the results of sound insulation measurements at various reverberation time lengths in subsequent stages of diffusing elements installation in the receiving room. An analysis of diffusing materials amount and arrangement influence on the uniformity of the sound pressure level distribution and reverberation time in the room as well as the value of the measured sound insulation was carried out. Uncertainty of sound insulation measurement with partial uncertainties was adopted as a criterion supporting the assessment of the obtained results.
Źródło:
Archives of Acoustics; 2019, 44, 4; 739-746
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Swine confinement buildings: effects of airborne particles and settled dust on airway smooth muscles
Autorzy:
Demanche, A
Bonlokke, J.H.
Beaulieu, M.-J.
Assayag, E.I.
Cormier, Y.
Powiązania:
https://bibliotekanauki.pl/articles/50090.pdf
Data publikacji:
2009
Wydawca:
Instytut Medycyny Wsi
Tematy:
pig building
airborne particle
airborne settled dust
airway smooth muscle
endotoxin
bronchoconstriction
airway inflammation
pig barn
Źródło:
Annals of Agricultural and Environmental Medicine; 2009, 16, 2; 233-238
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Important phytopathogenic airborne fungal spores in a rural area: incidence of Botrytis cinerea and Oidium spp.
Autorzy:
Oliveira, M
Guerner-Moreira, J.
Mesquita, M.M.
Abreu, I.
Powiązania:
https://bibliotekanauki.pl/articles/49320.pdf
Data publikacji:
2009
Wydawca:
Instytut Medycyny Wsi
Tematy:
airborne fungi
fungi
airborne spore
grey mould
phytopathology
powdery mildew
rural area
Botrytis cinerea
Oidium
Vitis vinifera
Źródło:
Annals of Agricultural and Environmental Medicine; 2009, 16, 2; 197-204
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Fraxinus pollen seasons and forecast models based on meteorological factors
Autorzy:
Kubik-Komar, A.
Piotrowska-Weryszko, K.
Weryszko-Chmielewska, E.
Kaszewski, B.M.
Powiązania:
https://bibliotekanauki.pl/articles/2081720.pdf
Data publikacji:
2018
Wydawca:
Instytut Medycyny Wsi
Tematy:
allergy
regression analysis
aerobiology
airborne pollen
Fraxinus
Opis:
Introduction and objective. The timings of Fraxinus and Betula flowering and pollen release overlap, which may cause increased allergic reactions in sensitive people. The aim of the present study was to characterize Fraxinus pollen seasons in Lublin (central-eastern Poland) and to identify meteorological factors that most determine the occurrence of airborne pollen of this taxon, as well as obtain forecast models for the basic characteristics of the pollen season. Materials and method. The study was conducted in Lublin during the period 2001–2016, employing the volumetric method. The seasons were compared by PCA (Principal Component Analysis). To determine relationships between meteorological conditions and the pattern of pollen seasons, regression analysis was used. Data for the period 2001–2015 were used to create forecast models by applying regression analysis, while the 2016 data served to verify these models. Results. Season end date and seasonal peak date were characterized by the lowest variation. The biggest differences were found for peak value and total annual pollen sum. The average dates of occurrence of ash pollen grains in the air of Lublin were between 13 April 13 – 3 May 3, whereas, on average, the pollen peak date occurred on 23 April. The factor loading values for the PC1 variable indicate that it is most strongly correlated with peak value and total pollen sum, while the PC2 variable correlated with the pollen season start date and season duration (a negative correlation). Regression models were developed for the following pollen season characteristics: season start, end and duration, seasonal peak date, and total annual pollen sum. Conclusions. The fit of the forecast models was at the level of 62–94%. Analysis of the data showed that weather conditions mainly in February were important factors controlling the Fraxinus pollen season.
Źródło:
Annals of Agricultural and Environmental Medicine; 2018, 25, 2; 285-291
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Data acquisition with the APEX hyperspectral sensor
Autorzy:
Vreys, Kristin
Iordache, Marian-Daniel
Bomans, Bart
Meuleman, Koen
Powiązania:
https://bibliotekanauki.pl/articles/1035944.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
Hyperspectral
data acquisition
airborne
APEX
mission planning
Opis:
APEX (Airborne Prism EXperiment) is a high spectral and spatial resolution hyperspectral sensor developed by a Swiss-Belgian consortium on behalf of the European Space Agency. Since the acceptance of the instrument in 2010, it has been operated jointly by the Flemish Institute for Technological Research (VITO, Mol, Belgium) and the Remote Sensing Laboratories (RSL, Zurich, Switzerland). During this period, several flight campaigns have been performed across Europe, gathering over 4 Terabytes of raw data. Following radiometric, geometric and atmospheric processing, this data has been provided to a multitude of Belgian and European researchers, institutes and agencies, including the European Space Agency (ESA), the European Facility for Airborne Research (EUFAR) and the Belgian Science Policy Office (BelSPO). The applications of APEX data span a wide range of research topics, e.g. landcover mapping (mountainous, coastal, countryside and urban regions), the assessment of important structural and (bio)physical characteristics of vegetative and non-vegetative species, the tracing of atmospheric gases, and water content analysis (chlorophyll, suspended matter). Recurrent instrument calibration, accurate flight planning and preparation, and experienced pilots and instrument operators are crucial to successful data acquisition campaigns. In this paper, we highlight in detail these practical aspects of a typical APEX data acquisition campaign.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2016, 20, 1; 5-10
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The NRPB environmental radioactivity surveillance programme
Autorzy:
Green, N.
Powiązania:
https://bibliotekanauki.pl/articles/148046.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
airborne dust
environment
milk
radioactivity
surveillence
UK
Opis:
The National Radiological Protection Board (NRPB) has operated an environmental radioactivity surveillance programme for some years. Originally, samples of airborne dust, rainwater and milk were collected from the constituent countries of the UK. However, due mainly to the decreasing activity concentrations of radionuclides in these materials, this programme has been reduced and now forms part of contingency planning in the event of an accident. The programme can be expanded to fill the need for rapid results and answer public concerns. Other programmes within the UK complement the Board's programme.
Źródło:
Nukleonika; 2001, 46, 4; 127-129
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pollen grains as airborne allergenic particles
Autorzy:
Denisow, B.
Weryszko-Chmielewska, E.
Powiązania:
https://bibliotekanauki.pl/articles/27332.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
pollen grain
airborne allergen
airborne particle
geographic region
pollen production
flowering plant
allergic disease
human disease
public health
Źródło:
Acta Agrobotanica; 2015, 68, 4
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioaerosols of the Municipal Waste Landfill Site as a Source of Microbiological Air Pollution and Health Hazard
Bioaerozole składowiska odpadów komunalnych jako źródło mikrobiologicznego zanieczyszczenia powietrza i zagrożenia zdrowotnego
Autorzy:
Breza-Boruta, B.
Powiązania:
https://bibliotekanauki.pl/articles/389120.pdf
Data publikacji:
2012
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
aerozol bakteryjny
aerozol grzybowy
promieniowce
bioaerozol
składowisko odpadów komunalnych
airborne bacteria
airborne fungi
Actinomycetes
bioaerosol
municipal waste landfill site
Opis:
The aim of this study was to determine the composition of bacterial and fungal aerosol on the premises of the Municipal Waste Disposal Complex at Zolwin-Wypaleniska near Bydgoszcz and to evaluate the degree of microbiological air pollution at the appointed stands. Microbial concentration in the air was determined at the waste sorting station and in the active sector of the landfill site as well as in the point situated 200 m beyond the facility. It was found that the total number of bacteria in the air ranged from 102 to 104 cfu ź m–3 and many times strong air pollution occurred on the premises of that facility. High concentration level of actinomycetes and indicator bacteria Pseudomonas flourescens contributed also to strong or moderate air pollution at research stands 1 and 2. Potentially pathogenic bacteria of the family Enterobacteriaceae (such as bacilli of Salmonella sp. and Escherichia coli) as well as faecal streptococci occurred in the largest amounts also at stands 1 and 2, and their number reached up to 103 cfu ź m–3. The obtained values show that both the sorting station the active sector of the waste landfill are serious emission sources of dangerous bacterial aerosol. They can pose a health hazard to the workers staying at those workstands. The determined amounts of fungal aerosol prove that it did not pose a microbiological hazard, and the studied air was described as moderately clean throughout the research period, only in the area of the sorting station it was polluted at several times. Among the isolated fungi, species of the genera Aspergillus and Penicillium predominated, as well as Sclerotinia sclerotorum. However, also potentially pathogenic species were detected in the studied air, such as: Aspergillus fumigatus, Cladosporium herbarium, Alternaria alternata etc. Their presence may affect the health of people (workers of the facility and residents of neighbouring areas) and the risk of the environmental pollution, since those species are well-known for their production of mycotoxins and inducing allergic reactions. Based on the registered concentrations of bacteria and fungi at the point 200 m away from the facility, it should be assumed that the studied air was not polluted and bioaerosol transmission from the sources of emission to the surrounding areas did not occur.
Celem pracy było oznaczenie składu bioaerozolu bakteryjnego i grzybowego na terenie Zakładu Unieszkodliwiania Odpadów Komunalnych w Żółwinie-Wypaleniska koło Bydgoszczy oraz ocena stopnia mikrobiologicznego zanieczyszczenia powietrza na wyznaczonych stanowiskach. Koncentrację mikroorganizmów w powietrzu określano na terenie sortowni odpadów i w sektorze czynnym składowiska oraz w punkcie położonym 200 m poza obiektem. Stwierdzono, że liczba bakterii ogółem w powietrzu kształtowała się od 102 do 104 jtk ź m-3 i doszło wielokrotnie do silnego zanieczyszczenia powietrza na terenie zakładu. Wysoki poziom koncentracji promieniowców i bakterii wskaźnikowych Pseudomonas fluorescens przyczynił się także do silnego lub średniego zanieczyszczenie powietrza na 1 i 2 stanowisku badawczym. Potencjalnie chorobotwórcze bakterie z rodziny Enterobacteriaceae (m.in. pałeczki Salmonella sp. i Escherichia coli) oraz paciorkowce kałowe w największych ilościach występowały również na stanowisku 1 i 2, a ich liczba dochodziła do 103 jtk ź m-3. Uzyskane wartości wskazują, że zarówno sortownia, jak i sektor czynny składowiska odpadów były poważnymi emitorami niebezpiecznego aerozolu bakteryjnego, zatem stanowić mogą zagrożenie zdrowotne dla pracowników przebywających na tych stanowiskach pracy. Oznaczona ilości aerozolu grzybowego świadczy, że nie stanowił on zagrożenia mikrobiologicznego, a badane powietrze określono jako przeciętnie czyste w całym okresie badawczym. Jedynie na terenie sortowni w kilku terminach doszło do jego skażenia. Wśród wyizolowanych grzybów dominowały gatunki z rodzaju Aspergillus i Penicillium oraz Sclerotinia sclerotorum. Jednakże wykryto w badanym powietrzu również gatunki potencjalnie chorobotwórcze, takie jak: Aspergillus fumigatus Cladosporium herbarium, Alternaria alternata i in. Ich obecność może wpływać na zdrowie ludzi (pracowników zakładu i mieszkańców przyległych terenów) oraz ryzyko skażenia środowiska, bowiem gatunki te znane są z produkcji mykotoksyn oraz wywoływania reakcji alergicznych. Na podstawie zarejestrowanego stężenia bakterii i grzybów w punkcie oddalonym 200 m od zakładu, należy przyjąć, że badane powietrze było niezanieczyszczone i nie doszło do przenoszenia bioaerozolu ze źródeł emisji na okoliczne tereny.
Źródło:
Ecological Chemistry and Engineering. A; 2012, 19, 8; 851-862
1898-6188
2084-4530
Pojawia się w:
Ecological Chemistry and Engineering. A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of ambient air temperature and solar radiation on changes in bacterial and fungal aerosols concentration in the urban environment
Autorzy:
Kowalski, M.
Pastuszka, J.S.
Powiązania:
https://bibliotekanauki.pl/articles/2081692.pdf
Data publikacji:
2018
Wydawca:
Instytut Medycyny Wsi
Tematy:
Bioaerosol
solar radiation
sterilization
airborne microorganisms
temperature breakpoint
Opis:
Bioaerosols are particularly sensitive to sterilization processes due to their biological characteristics. Phenomena occurring in the atmosphere have major influence on airborne bacteria and fungi concentration levels. The presented study evaluates the sterilization properties of ambient air temperature and solar radiation on viable bioaerosols concentration levels in outdoor air in Gliwice, Poland. Assigned were the breakpoints indicating limited stimulation properties of the air temperature, which amounted 7.5 °C for bacterial aerosol and 16.5 °C for fungal aerosol. Also revealed was the influence of solar radiation properties on decreasing the bioaerosols concentration levels. Both bacterial and fungal viable aerosol were sensitive to this radiation, although the phenomenon was more effective for airborne bacteria.
Źródło:
Annals of Agricultural and Environmental Medicine; 2018, 25, 2; 259-261
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical flow simulation of rotating circular saw blades for the investigation of sound generation mechanisms
Autorzy:
Möhring, H.-C.
Stehle, T.
Güzel, K.
Zizelmann, C.
Powiązania:
https://bibliotekanauki.pl/articles/100200.pdf
Data publikacji:
2018
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
flow simulation
emission of airborne sound
acoustic examination
Opis:
Emission of airborne sound in the production industry is endangering the employees’ health and is lowering productivity. Circular saw blades in particular cause high sound pressure levels. Therefore, the tool geometry of saw blades should be improved in the sense that the emission of airborne sound is lowered. In this work, the basics for the tool optimization regarding the emission of airborne sound are elaborated. To avoid high costs for various prototypes and experimental investigations, a computational fluid dynamics (CFD) simulation is used. By this, the effects of the adjustments of the geometry on the fluid mechanics can be researched efficiently. Using the acoustic analogy of Ffowcs-Williams/Hawkings, the results of the numerical flow simulation are converted into the sound pressure level. To validate the calculated results, previously conducted experiments are used for comparison. The calculated results correspond well to the values from the experimental measurements. Hence, it is possible to use the developed method to predict the influence of geometry adjustments on the acoustic behaviour, making the optimization process possible. In an outlook, the concept for an optimization loop is explained, which couples the CFD simulation with a parameterized geometry model and an evaluation algorithm.
Źródło:
Journal of Machine Engineering; 2018, 18, 1; 61-71
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 236

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