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    Wyświetlanie 1-9 z 9
    Tytuł:
    The influence of the cutting tooth design and wear of a saw chain on the vibration level of a chainsaw
    Autorzy:
    Rukat, W.
    Jakubek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/127667.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    chainsaw
    saw chain wear
    cutting tooth design
    local vibration
    pilarka łańcuchowa
    zużycie łańcucha tnącego
    ząb tnący
    drgania miejscowe
    Opis:
    Chainsaws are the most basic mechanical tools used to harvest and pre-treat wood. Unfortunately, these devices emit noise and vibrations exceeding the maximum permissible levels for an 8-hour working day. Many factors influence the level of noise and vibration emitted by chainsaws. Since the conscious choice of the saw chain can significantly contribute to: productivity increase, vibration reduction and the operator's permissible total exposure time extension the influence of the type of a cutting tooth and its wear on the vibration level recorded on the handles of the device has been investigated in this paper.
    Źródło:
    Vibrations in Physical Systems; 2017, 28; 1-8
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of acoustic parameters of devices with extensive sound sources
    Autorzy:
    Jakubek, B.
    Barczewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/127762.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    urządzenia z zewnętrznymi źródłami dźwięku
    poziom mocy akustycznej
    urządzenia biomedyczne
    devices with extensive sound sources
    DESS
    sound power level
    biomedical devices
    Opis:
    In most cases, while the sound power level of machines and devices is determined, it is assumed that tested objects are sound sources which can fit in a so-called reference box. Such an approach takes into account the influence of local sources. Although it does not allow their localization, separate noise measurement and evaluation. There are devices which have two or more relevant sound sources. In this paper this type of devices has been defined as devices with extensive sound sources (DESS). The tested device is a functional unit but its local sound sources are distant from each other. The results showed that determining the sound power level only is not sufficient for proper parameterization of noise emitted by DESS.
    Źródło:
    Vibrations in Physical Systems; 2016, 27; 129-134
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of vibration impact of an impact drill on the human body under different working conditions
    Autorzy:
    Jakubek, B.
    Rukat, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/127980.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    impact drill
    local vibration
    concrete drilling
    drill bit
    different working conditions
    wiertarka udarowa
    drgania lokalne
    drgania miejscowe
    wiertło
    różne warunki pracy
    Opis:
    Currently there is a wide range of different kinds of power tools on the market. In the case of impact drills the major threat to the user’s health are vibration and acoustic impacts. Knowing that the actual drilling conditions may vary significantly from standardized conditions. It is important to determine the actual maximum level of dangerous factors present during drilling. Furthermore, it is also very important to link that factors to the conditions in which they occur. Among many factors affecting the level of vibration of an impact drill, change of the working position, the length of the drill bit and the diameter of the drill bit were verified in this paper. Verification was based on a comparison of vector-weighted mean values of acceleration of vibrations RMS a registered on the handles of the impact drill, while drilling in concrete, under different working conditions.
    Źródło:
    Vibrations in Physical Systems; 2016, 27; 135-142
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of rolling bearings’ diagnosing methods - procedures of damage introduction
    Autorzy:
    Jakubek, B.
    Jakubowicz, M.
    Smułek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/127677.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    tapered roller bearings
    postproduction control
    bearing faults
    bearing damage
    łożysko stożkowe
    kontrola poprodukcyjna
    uszkodzenia łożysk
    Opis:
    The rolling bearings’ diagnosing methods used in exploitation diagnostics are not usually dedicated to the postproduction control. However, this does not mean, that they cannot be used there. A comprehensive comparison of the sensitivity of rolling bearings’ diagnosing methods to occurrence of faults and damage should be based on measurements of new, undamaged bearings and bearings with defects. An accurate determination of the location, size and origin of defects is expected from a set of testing bearings. The paper presents a comparison of three methods of damage introduction: sandblasting, pickling and spark erosion. Procedures for introducing damage into bearing’s races have been described. In addition, race’s geometries and vibration signals generated by operating bearings were compared.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-8
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of supply options of an asynchronous electric motor on emitted noise
    Autorzy:
    Barczewski, R.
    Jakubek, B.
    Wróbel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/127811.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    asynchronous electric motor
    noise
    motor connection
    elektryczny silnik asynchroniczny
    hałas
    podłączenie silnika
    Opis:
    A comparison of the noise emitted by an asynchronous electric motor for various supply options has been presented in this paper. The star connection, one phase connection (with a run capacitor) and the use of an inverter have been taken under consideration. The test results show the effect of supply options of the electric motor on the sound power level, the shape of the noise spectra and directivity changes of the sound emitted by the tested asynchronous electric motor.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-8
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The noise of biomedical devices for domiciliary use on the example of a nebulizer
    Autorzy:
    Jakubek, B.
    Rukat, W.
    Grochalski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/127940.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    nebulizer
    devices with extensive sound sources
    DESS
    sound power level
    biomedical devices
    nebulizator
    urządzenia z zewnętrznymi źródłami dźwięku
    poziom mocy akustycznej
    urządzenia biomedyczne
    Opis:
    Widely available and inexpensive biomedical devices for domiciliary use may emit noise. Nebulizers are one of them. They allow taking drugs in the form of vapours thanks to vaporization under reduced pressure using an ejector (vacuum generator). The sources of noise in a nebulizer are an air compressor and a vaporizing tip. The presence of two sources with a different noise character and unfixed spatial orientation allows to classify a nebulizer as a device with extensive sound sources (DESS). The article presents the results of acoustic measurements of the nebulizer and its components. Differences in the nature of components’ noise were found and their estimates were compared. Noise hazards for the device’s user were determined and the premises for the noise parameterization of devices of this type were specified.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-6
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the lubrication on the vibroacoustic signal generated by rolling bearings
    Autorzy:
    Jakubek, B.
    Barczewski, R.
    Jakubowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/128154.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    tapered roller bearings
    lubrication
    post-production diagnostics
    łożysko stożkowe
    smarowanie
    diagnostyka poprodukcyjna
    Opis:
    Long-life and failure-free operation of rolling bearings depends on the proper lubrication. Additionally lubrication reduces vibration and noise generated by the operating bearing. However, from the point of view of the post-production diagnostics, lubrication can lead to undesirable masking of damage and manufacturing defects. This article presents the comparison of parameters of vibroacoustic signals generated by tapered roller bearings under different lubrication conditions. The influence of the lubricant on the form of vibroacoustic signals in both amplitude and frequency terms was determined. The premises on the choice of the lubricant for the post-production diagnostics of rolling bearings have also been specified.
    Źródło:
    Vibrations in Physical Systems; 2017, 28; 1-9
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The noise emitted by a vacuum cleaner treated as a device with extensive sound sources
    Autorzy:
    Rukat, W.
    Jakubek, B.
    Madej, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/127827.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    devices with extensive sound sources
    DESS
    sound power level
    vacuum cleaner
    noise
    urządzenia z zewnętrznymi źródłami dźwięku
    poziom mocy akustycznej
    odkurzacz
    hałas
    Opis:
    Vacuum cleaners can be found in almost every household. They are one of the most intense noise sources there. Noise generated by vacuum cleaners is partially of mechanical, electrical and aerodynamic origin. A suction unit is the source of mechanical and electromagnetic noise. A suction nozzle or a cleaning head as well as a flexible hose that connects the components are sources of aerodynamic noise. The noise of the suction unit depends on the load and the technical condition of the motor. The noise of the nozzle and the hose depend on the flow capacity, presence of solid particles and the type of cleaned surface. The article presents a comparison of acoustic parameters of a vacuum cleaner working on various surfaces. In addition, the noise generated by the vacuum cleaner was compared according to the standard noise testing procedure and according to the definition of devices with extensive sound sources.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-8
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seroprevalence of Neospora caninum in free living and farmed red deer [Cervus elaphus] in Poland
    Autorzy:
    Gozdzik, K
    Jakubek, E.B.
    Bjorkman, C.
    Bien, J.
    Moskwa, B.
    Cabaj, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/32072.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Polska
    free living red deer
    farmed red deer
    red deer
    Cervus elaphus
    seroprevalence
    Neospora caninum
    ELISA test
    immunoblot
    animal disease
    animal infection
    Opis:
    Serum samples from 47 free living and 106 farmed red deer (Cervus elaphus) from the Mazurian Lake District in north-east Poland were investigated for the presence of antibodies to Neospora caninum. A modified Neospora iscom-ELISA was used for initial screening. All sera with optical density (OD) values exceeding 0.400 absorbance units were further investigated by Western blot analysis. Eighteen sera were positive in both tests. Six of these were from free living and 12 from farmed animals giving prevalence of 13 and 11%, respectively. This is the first report of N. caninum infection in farmed and free-living red deer living in the same region where neosporosis was confirmed in cattle and the first evidence of exposure to the parasite in red deer in Poland.
    Źródło:
    Polish Journal of Veterinary Sciences; 2010, 13, 1; 117-120
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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