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    Wyświetlanie 1-3 z 3
    Tytuł:
    Rating of the Activities of Urban Transport Policy in the Context of Sustainable Development
    Autorzy:
    Nordin, Victor
    Kharitoshkin, Nikolai
    Czerwińska-Lubszczyk, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/2064309.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    environment
    ecology
    sustainable development
    transport policy
    środowisko
    ekologia
    rozwój zrównoważony
    polityka transportowa
    Opis:
    The growing number of cars cities is worsening the quality of life of our citizens, aggravating their problems with mobility, social inequality, health and ecology. The implementation of the Sustainable Development Goals implies carrying out measures aimed at reducing the impact of urban transport systems in three interrelated directions. The aim of this chapter is describe the conditions and measures to reduce the negative impact of these problems combined into transport policy measures in two ways. The method of expert assessments allowed to rank these activities in order to establish the sequence of their implementation in cities in order to bring their state closer to the “livable city”.
    Źródło:
    New Trends in Production Engineering; 2020, 3, 1; 355--366
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of grinding technology with vortex cooling of steels that are liable to crack propagation
    Autorzy:
    Ivanova, Tatiana Nikolaevna
    Biały, Witold
    Nordin, Victor
    Powiązania:
    https://bibliotekanauki.pl/articles/2064897.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    steel
    grinding
    temperature
    vortex cooling
    wheel
    Opis:
    Complexity of grinding process and phenomena entailing it not always allow reaching required technological results, especially while machining surfaces of parts made of tough-to-machine steels, which are liable to crack propagation. Cracks can occur in these parts during grinding due to considerable temperature difference along the section, which can cause formation of high temporary internal tensile stress. Application of cooled air in grinding process exerts considerable influence over temperature decrease in cutting area. In addition, it depends not only on heat exchange, but also on properties of cold air flow. The greatest effect of temperature decrease can be reached by injection of cold air flow in cutting area with implementation of vortex effect, which occurs in swirl flow of compressed air originating in vortex tube. The study of heat generation during machining by tools with discontinuous cutting surface and vortex air cooling was carried out. Obtained thermophysical parameters of vortex air cooling (increase in speed of stream flowing, expansion degree, share of cold stream and decrease in humidity of air stream) allow reducing heat density due to growth of cooling effect in grinding zone. On the base of experimental studies we developed recommendations for choice of optimal grinding modes by tool with discontinuous cutting surface and vortex air cooling of flat parts made of steels being liable to cracking.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2019, 2, 1; 9--23
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technological Forecasting of Deformations in Flat Parts
    Autorzy:
    Ivanova, Tatiana N.
    Biały, Witold
    Fries, Jiri
    Nordin, Victor
    Powiązania:
    https://bibliotekanauki.pl/articles/2064652.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    deformation
    state stress
    stress diagram
    residual stresses
    stress formation
    grinding
    Opis:
    The deformation of a part occurring in the process of grinding directly influences its exploitation and quality parameters. The instability of shape and size, which occurs due to an imbalance of residual stress, can be the one of the major causes of deformation of a part. The decrease in stress slows down the deformation process. Considering the regularities of heat source intensity dependence on the grinding modes, it can be asserted that with increasing grinding depth and grinding wheel hardness, the value increases and it decreases with a growth in a speed of the part and the use of cooling. The higher the heat removal is and the better lubricant properties of the liquid are, the more significant the decrease in is. Changing these values allows regulation of the residual stresses. As a result of the research on determination of deformations, it is recommended to reduce thermal deformations by considering the geometric size of a plate to be machined, linear expansion coefficient of plate material and an allowance for nonflatness from thermal deformations. The value of nonflatness from thermal deformations is directly proportional to linear expansion coefficient of plate material and its square overall dimensions. At the same time, the value of nonflatness is inversely proportional to the plate thickness.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 1--12
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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