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    Wyświetlanie 1-3 z 3
    Tytuł:
    Quantitative determination of the reasons of errors concerning the calculation of the bearing capacity of slewing bearings
    Kwantyfikacja przyczyn błędów dotyczących obliczania nośności łożysk tocznych wieńcowych
    Autorzy:
    Jagusiak-Kocik, M.
    Krynke, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/112929.pdf
    Data publikacji:
    2016
    Wydawca:
    STE GROUP
    Tematy:
    slewing bearing
    carrying capacity
    FMEA
    Ishikawa diagram
    łożysko wieńcowe
    nośność statyczna
    metoda FMEA
    diagram Ishikawy
    Opis:
    In the article the factors influencing the improvement of the quality and improvement of process of calculation of bearing capacity of rolling slewing bearings. An aim of conducted deliberations is the identification and elimination of sources of errors in determining the characteristics of slewing bearing capacity. The result of the research is to determine the risk of making mistakes and tips for designers of slewing bearings.
    W artykule przedstawiono czynniki wpływające na poprawę jakości i udoskonalenia procesu obliczania nośności łożysk tocznych wieńcowych. Celem prowadzonych rozważań jest znalezienie i wyeliminowanie źródeł powstawania błędów przy określaniu charakterystyk nośności łożysk tocznych wieńcowych. Wynikiem prowadzonych badań jest określenie stopnia ryzyka popełniania błędów oraz wskazówki dla projektantów łożysk tocznych wieńcowych.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2016, 3 (15); 87-96
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Engineering-geological and geotechnical investigations for risk assessment of the University Olympic Village in Izmir (Turkey)
    Autorzy:
    Kıncal, Cem
    Koca, Mehmet Yalçın
    Yılmaz, H. Recep
    Akgün, Mustafa
    Özyalın, Şenol
    Eskişar, Tuğba
    Akçığ, Zafer
    Loon, A. J. (Tom)
    Powiązania:
    https://bibliotekanauki.pl/articles/94556.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    engineering geology
    hazard maps
    bearing capacity
    Izmir
    Turkey
    geologia inżynierska
    mapy zagrożenia
    nośność statyczna
    Turcja
    Opis:
    The Metropolitan Municipality of Izmir (Turkey) designated a steeply inclined area for the construction of buildings to house the participants of the Izmir University Olympic Games. Before the construction activities could start, engineering geological and geotechnical investigations had to be carried out in order to establish which zones in the area were suitable for safe constructions. Seismic studies, borings and laboratory tests yielded the data, which were used for preparing five hazard maps in a GIS environment. The construction activities based on the results of this complex investigation appeared successful. The engineering geological investigations included geotechnical measurements on core samples obtained from the boreholes (core drilling) and laboratory testing. The rock-quality designation (RQD%) values of the rock units were determined and used in the rock-mass classification (rock-mass rating method) as an in-put parameter and in the calculation of the bearing capacity of the various rock units. Geophysical surveys were carried out to determine the seismic velocity of the rocks at the site. A short overview is provided of the main problems that had to be dealt with, and of the successive steps taken to solve the engineering-geological problems. Determination of these problems is necessary for adequate land-use planning and construction activities.
    Źródło:
    Geologos; 2010, 16, 1; 43-57
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental studies of static and dynamic steel arch support load capacity and sliding joint temperature parameters during yielding
    Autorzy:
    Pytlik, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1853806.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nośność statyczna
    wyrobisko
    podpora stalowa
    yielding steel arch support
    support shackle torque
    static and dynamic load capacity
    support work
    arch acceleration in sliding joints
    joint sparking and heating temperature during yielding
    Opis:
    Difficult geological and mining conditions as well as great stresses in the rock mass result in significant deformations of the rocks that surround the workings and also lead to the occurrence of tremors and rock bursts. Yielding steel arch support has been utilised in the face of hard coal extraction under difficult conditions for many years, both in Poland and abroad. A significant improvement in maintaining gallery working stability is achieved by increasing the yielding support load capacity and work through bolting; however, the use of rock bolts is often limited due to factors such as weak roof rock, significant rock mass fracturing, water accumulation, etc. This is why research and design efforts continue in order to increase yielding steel arch support resistance to both static and dynamic loads. Currently, the most commonly employed type of yielding steel arch support is a support system with frames constructed from overlapping steel arches coupled by shackles. The yield of the steel frame is accomplished by means of sliding joints constructed from sections of various profiles (e.g. V, TH or U-type), which slip after the friction force is exceeded; this force is primarily dependent on the type of shackles and the torque of the shackle screw nuts. This article presents the static bench testing results of ŁP10/V36/4/A, ŁP10/V32/4/A and ŁP10/V29/4/A yielding steel arch support systems formed from S480W and S560W steel with increased mechanical properties. The tests were conducted using 2 and 3 shackles in the joint, which made it possible to compare the load capacities, work values and characteristics of various types of support. The following shackle screw torques were used for the tests: Md = 500 Nm – for shackles utilised in the support constructed from V32 and V36 sections. Md = 400 Nm – for shackles utilised in the support constructed from V29 sections. The shackle screw torques used during the tests were greater compared to the currently utilised standard shackle screw torques within the range of Md = 350-450 Nm. Dynamic testing of the sliding joints constructed from V32 section with 2 and 3 shackles was also performed. The SD32/36W shackles utilised during the tests were produced in the reinforced versions and manufactured using S480W steel. Since comparative testing of a rock bolt-reinforced steel arch support system revealed that the bolts would undergo failure at the point of the support yield, a decision was made to investigate the character of the dynamics of this phenomenon. Consequently, this article also presents unique measurement results for top section acceleration values registered in the joints during the conduction of support tests at fullscale.Filming the yield in the joint using high-speed video and thermal cameras made it possible to register the dynamic characteristics of the joint heating process at the arch contact point as well as the mechanical sparks that accompanied it. Considering that these phenomena have thus far been poorly understood, recognising their significance is of great importance from the perspective of occupational safety under the conditions of an explosive atmosphere, especially in the light of the requirements of the new standard EN ISO 80079-36:2016, harmonised with the ATEX directive.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 3; 469-491
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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