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    Wyświetlanie 1-3 z 3
    Tytuł:
    On magnetization deviations as the dominant cause for vibration harmonics in the spectrum of a PMSM drive
    Autorzy:
    Jaeger, Markus
    Drichel, Pascal
    Schröder, Michael
    Berroth, Joerg
    Jacobs, Georg
    Hameyer, Kay
    Powiązania:
    https://bibliotekanauki.pl/articles/1841219.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric machines
    electromagnetic fields
    NVH
    permanent magnet machines
    permanent magnets
    production deviations
    Opis:
    Production deviations have a remarkable effect on the radiated sound of electrical machines, introducing additional signal components besides the fundamental field waves which significantly change and enrich the subjectively perceived sound characteristic. In literature these harmonics are mainly traced back to dynamic eccentricity, which modulates the fundamental field waves. In this paper a thorough mechanic and electromagnetic analysis of a modern, well-constructed traction drive (permanent magnet synchronous machine) is performed to show that for this typical rotor configuration dynamic eccentricity is negligible. Instead, deviations in the rotor magnetization are shown to be the dominant cause for vibration harmonics.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 3; 719-730
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurements of acoustic response of car interion for structural excitations
    Autorzy:
    Paluch, Wojciech
    Kłaczyński, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/2146745.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    NVH
    automotive
    electric car
    sound intensity
    diagnostics
    samochód elektryczny
    diagnostyka
    natężenie dźwięku
    Opis:
    The transition from internal combustion to electric propulsion in cars presents component designers with new challenges in terms of noise reduction. Until now, components such as the suspension, its knocks were masked by the combustion engine or exhaust system. The absence of such significant sources, means that hitherto inaudible components are starting to become a nuisance. In order to reduce their noise, a number of optimisation solutions, both active and passive, are used. In order to do so, relevant measurements and data analysis must be carried out. This paper aims to present the acoustic characteristics of the interiors of two cars excited structurally in the vicinity of the front shock absorber mounting and by the operation of another component, the windscreen wipers on dry and wet windscreens. Measurements were made using 3D intensity probes based on acoustic particle velocity sensors. The results, in the form of both acoustic particle velocity and sound pressure characteristics and spectrograms, are presented comparatively for two types of car.
    Źródło:
    Diagnostyka; 2022, 23, 4; art. no. 2022413
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NVH application research using accelerometers on a chassis dynamometer
    Autorzy:
    Sitnik, L.
    Wróbel, R.
    Andrych-Zalewska, M.
    Mihaylov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/242905.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    NVH
    LDV
    chassis dynamometer
    Opis:
    Accelerometric tests, similarly to laser tests (with regard to human health) are something of novelty. All standards related to this issue refer to sound intensity (measured using specialised microphones). The work presents results of accelerometric tests conducted during driving cycles on an inertial load chassis dynamometer Maha LPS3000. The object of the research was Mazda 3 1.6 (petrol), built in 2010, mileage 70 thousand km. The tests were related to vibration measurements on a chassis dynamometer using various, forced tractive effort (300, 500 and 700 N). No additional signal processing was used (except for operations necessary to create a spectrum) so as to present the whole vibration spectrum with special emphasis on the resonance frequency of human organs. The article presents vibration amplitude measured at the level of the headrest for three forced tractive efforts: 300, 500 and 700 N. The measurements were made at the speed of 60 km/h in the fourth gear (which corresponds to about 2000 rpm). The obtained results, indicate that the maximum value of harmonics fall in the range 85-95 Hz. Hence, they are resonance frequencies of eyeballs. In addition to this, one can state that the values of these harmonics are higher for higher values of forced tractive efforts. This would mean that seats should be additionally stabilised (dampened) to limit the influence of dangerous vibration on a human organism.
    Źródło:
    Journal of KONES; 2016, 23, 3; 443-448
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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