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  • IOP Publishing  (2)
  • Wang, Yanjun  (2)
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  • IOP Publishing  (2)
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  • 1
    Online-Ressource
    Online-Ressource
    IOP Publishing ; 2022
    In:  Journal of Physics: Conference Series Vol. 2174, No. 1 ( 2022-01-01), p. 012047-
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2174, No. 1 ( 2022-01-01), p. 012047-
    Kurzfassung: The Effects of raceway convexities on friction moment of tapered roller bearings were studied in this paper. A new theoretical model of friction torque of tapered roller bearings was established considering the roughness and convexities of inner and outer ring raceways. Friction between roller and raceways were analyzed under the condition of elastohydrodynamic lubrication. Based on the theoretical model and experiments, the changes of friction torque with respected to raceway convexities of tapered roller bearings were obtained. The results show that the friction moment decreases with the increase of raceway convexities, while the increase of raceway convexity leads to the increase of contact stress. Therefore, the convexity values should be balanced between friction torque and contact stress. The convexity values should be balanced between friction torque and contact stress. The optimum values of the bearing being measured raceway convexities should be 5 ~ 6μm under the test conditions.
    Materialart: Online-Ressource
    ISSN: 1742-6588 , 1742-6596
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2022
    ZDB Id: 2166409-2
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    Online-Ressource
    Online-Ressource
    IOP Publishing ; 2020
    In:  IOP Conference Series: Earth and Environmental Science Vol. 559, No. 1 ( 2020-08-01), p. 012008-
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 559, No. 1 ( 2020-08-01), p. 012008-
    Kurzfassung: Northeast China is one of the major wine-making grape bases in China. It is of great significance to study the influence of climate change on grape planting regionalization in northeast China for industrial layout and grape variety selection. According to the 168 weather stations in northeast China Daily meteorological data, calculate the frost-free period, growing season dry degree, active accumulated temperature of April to September, average annual extreme low temperature and other indicators, the 45 years from 1967 to 2011 in the northeast of grapes zoning index change trend, using GIS analysis of wine grapes in the northeast suitable cultivated area change of time and space. The results showed that the temperature increased obviously in the growing season, the indexes such as frost-free period and accumulated temperature of activity increased greatly, the suitable cultivation area of wine grapes expanded greatly to the north, and the dryness changed obviously between generations, showing a rising trend of fluctuation. The impact of climate change on viticulture varies from region to region, but overall, climate change is beneficial to wine viticulture in northeast China. The article also makes a series of Suggestions on how to use the effects of climate change to select varieties and improve wine quality.
    Materialart: Online-Ressource
    ISSN: 1755-1307 , 1755-1315
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2020
    ZDB Id: 2434538-6
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
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