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    Wyświetlanie 1-4 z 4
    Tytuł:
    Research on rub-impact loads response of ship shafting
    Autorzy:
    Dong, L.
    Shi, Y.
    Wang, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/260309.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    rub-impact
    Torsional Vibration
    Test Rig
    Rubbing Generator
    Opis:
    The anti-impact ability of shafting affects stability and security of the ship power transmission directly. Moreover, it also cannot be ignored that the rub-impact loads have influence on the torsion vibration of ship shafting. In order to solve the problem of engineering application of reliability assessment under rub-impact loads, a test rig with rubbing generator is established. By carrying out the integrative analysis, the torsional vibration characteristics, such as vibration amplitude and orbit of axle center under the rub impact load are studied. According to the rub-impact conditions obtained through numerical simulation, the experimental verification is carried out on the test rig with rubbing generator. The results show that it is not obvious the influence of rub-impact loads upon the shafting torsion vibration except in special working conditions, that can be simulated by the rubbing generator. The maximum amplitude of torsional vibration is influenced by the radial rigidity as well as the friction coefficient of rubbing body, and the degree of influence is difference under conditions of continuous rubbing and serious rubbing. By adjusting the rigidity of stern bearing, the influence of rub-impact upon shafting can be weaken, which provides a theoretical reference for the safety evaluation of ship shafting.
    Źródło:
    Polish Maritime Research; 2018, S 2; 85-91
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biblioteki Ruhr-Universität w Bochum
    The Libraries of the Ruhr-Universität in Bochum
    Autorzy:
    Krajcarz, Julia
    Powiązania:
    https://bibliotekanauki.pl/articles/571047.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Jagielloński. Biblioteka Jagiellońska
    Tematy:
    Germany
    Bochum
    Ruhr-Universität
    RUB
    libraries
    Niemcy
    biblioteki
    Opis:
    This article presents an outline of the history, the structure and the functioning of the Ruhr-Universität in Bochum (RUB) in Germany with a special focus on the library complex. The division of the university libraries, the organisation of their work, the criteria of availability of various types of documents and the standards of cataloguing, particularly those concerning subject processing, have also been described in this article. The author visited the libraries of the Ruhr-Universität in Bochum in May 2011 as part of a direct staff exchange organised by the Jagiellonian Library for several years. She graduated in Turkish language and literature and since January 2008 has worked in the Subject Processing Department of the Jagiellonian Library.
    Źródło:
    Biuletyn Biblioteki Jagiellońskiej; 2012, 62; 241-247
    0006-3940
    2450-0410
    Pojawia się w:
    Biuletyn Biblioteki Jagiellońskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resistance to ageing of selected books of children’s literature
    Autorzy:
    Gajadhur, M.
    Podsiadło, H.
    Abramczyk, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/115451.pdf
    Data publikacji:
    2011
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    rub-off resistance
    resistance to destruction processes
    colour coordinates
    partial main optical density
    production of children's books
    Opis:
    Resistance to ageing was studied for a number of selected items of children’s literature. Print rub-off tests were performed for 3 bases used in printing of children’s books, namely plastic sheets, white uncoated (off set) paper, and varnished prints. Three children’s books used in the experimental works were: a “bathing book” printed by flexographic technique on plastic sheets, a book printed on uncoated white paper, and a book printed on double-sided varnish-coated cardboard. Rub-off resistance tests were performed on Ink Rub Tester under identical rub rate (85 cycles/min). The resistance was evaluated by spectrophotometric and densitometric method and by visual observations. About 6000 rub-off cycles were performed for each of the books tested.
    Źródło:
    Challenges of Modern Technology; 2011, 2, 2; 35-37
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vibration measurement for crack and rub detection in rotors
    Autorzy:
    Hajnayeb, Ali
    Shirazi, Kourosh Heidari
    Aghaamiri, Reza
    Powiązania:
    https://bibliotekanauki.pl/articles/220975.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rotor vibrations
    crack
    rub
    fault detection
    chaos features
    largest Lyapunov exponent
    approximate entropy
    correlation dimension
    Opis:
    Shaft-stator rub and cracks on rotors, which have devastating effects on the industrial equipment, cause non-linear and in some cases chaotic lateral vibrations. On the other hand, vibrations caused by machinery fault scan be torsional in cases such as rub. Therefore, a combined analysis of lateral and torsional vibrations and extraction of chaotic features from these vibrations is an effective approach for rotor vibration monitoring. In this study, lateral and torsional vibrations of rotors have been examined for detecting cracks and rub. For this purpose, by preparing a laboratory model, the lateral vibrations of a system with crack and rub have been acquired. After that, a practical method for measuring the torsional vibrations of the system is introduced. By designing and installing this measurement system, practical test data were acquired on the laboratory setup. Then, the method of phase space reconstruction was used to examine the effect of faults on the chaotic behaviour of the system. In order to diagnose the faults based on the chaotic behaviour of the system, largest Lyapunov exponent (LLE), approximate entropy (ApEn) and correlation dimension were calculated for a healthy system and also for a system with rub and a crack. Finally, by applying these parameters, the chaotic feature space is introduced in order to diagnose the intentionally created faults. The results show that in this space, the distinction between the various defects in the system can be clearly identified, which enables to use this method in fault diagnosis of rotating machinery.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 1; 65-80
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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