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    Wyświetlanie 1-7 z 7
    Tytuł:
    Analysis of the impact of the frequency range of the tensometer bridge and projectile geometry on the results of measurements by the split Hopkinson pressure bar method
    Autorzy:
    Moćko, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/220701.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Hopkinson bar
    tensometer bridge
    amplifier bandwidth
    strain measurement
    Opis:
    The paper presents the results of the analysis of the striker shape impact on the shape of the mechanical elastic wave generated in the Hopkinson bar. The influence of the tensometer amplifier bandwidth on the stress-strain characteristics obtained in this method was analyzed too. For the purposes of analyzing under the computing environment ABAQUS / Explicit the test bench model was created, and then the analysis of the process of dynamic deformation of the specimen with specific mechanical parameters was carried out. Based on those tests, it was found that the geometry of the end of the striker has an effect on the form of the loading wave and the spectral width of the signal of that wave. Reduction of the striker end diameter reduces unwanted oscillations, however, adversely affects the time of strain rate stabilization. It was determined for the assumed test bench configuration that a tensometric measurement system with a bandwidth equal to 50 kHz is sufficient.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 4; 555-564
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of comprehensive reinforcement technology in high-rise building
    Autorzy:
    Heping, Cheng
    Wenchi, Yao
    Powiązania:
    https://bibliotekanauki.pl/articles/1852553.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    technologia zbrojenia kompleksowa
    budynek wysokościowy
    metoda zbrojenia sprężonymi prętami stalowymi
    zastosowanie
    comprehensive reinforcement technology
    high-rise building
    prestressed steel bar reinforcement method
    application
    Opis:
    In the structural reinforcement of a high-rise residential building in Changzhou city, Jiangsu province, China, the technology of prestressed steel bar strengthening shear wall, which was initiated in China, was applied. Combined with the engineering quality inspection report, the project characteristics and the requirements of the construction party, various methods, such as increasing cross-section reinforcement method and staged replacement concrete reinforcement method, were comprehensively used to treat and reinforce the structures with different quality problems and different parts. In general, the stress and strain of the newly added part always lags behind the stress and strain of the original structure. This will cause the stress of the original structure is too high and the deformation is large, while the stress of the new part is still at a low level, which cannot fully play its role and its due reinforcement effect. Prestressed steel bar reinforced shear wall technology, through the prestressed steel bar on the prestressed steel bar, which is a good solution to this problem, avoid the phenomenon of stress lag, and ultimately not only shorten the construction period of reinforcement, but also ensure the quality of reinforcement and user use area, successfully passed the reinforcement special acceptance. The monitoring data also proved that the reinforcement measures adopted are safe, reliable and economical. This paper can provide reference for the effective development of similar reinforcement projects.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 2; 231-246
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Tauberian Theorem for Weighted Means in Non-Archimedean Fields - Revisited and Revised
    Autorzy:
    Natarajan, P.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/746449.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    non-archimedean field
    weighted mean (or \((\bar{N}, p_n)\) method), Tauberian theorem
    Opis:
    In this note, \(K\) denotes a complete, non-trivially valued, non-archimedean field. We correct a Tauberian theorem for weighted means in \(K\) proved earlier in [1].
    Źródło:
    Commentationes Mathematicae; 2014, 54, 2
    0373-8299
    Pojawia się w:
    Commentationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of a shell with a main shaped charge warhead stroke into a bar armour with square section
    Autorzy:
    Niezgoda, T.
    Panowicz, R.
    Sybilski, K.
    Barnat, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/247419.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    mechanics
    finite elements method
    bar armor
    RPG
    Opis:
    Recent operations of Polish troops within the framework of peacemaking missions' uncovered weak points of the equipment used there. It turned out that one of the most significant threats is a shell equipped with a main shaped charge warhead used by partisan detachments. These can break even 900mm of shell-proof steel so it is very difflcult to protect anything from the shells. One of the ways of protection from high explosive anti-tank (HEAT) warheads is using bar armours. This paper focuses on analysis of a shell with PG-7G main shaped charge warhead stroke into a bar armor with a square section. This work presents a short description of the analyzed object. Moreover, there is a principle of operation of a shell with the speciflcation of the most trouble elements from the point ofview of high velocity partial stream creation. In addition, the paper indicates steps of a numerical model construction together with geometry simplifications and initial-marginal conditions. On the basis of the results the researchers evaluated the extent of destruction of shell key elements. Furthermore, the work indicates drawings with deformed parts and presents stresses maps of these elements. The summary states to what extent PG-7G shell stroke into the armor made of bars with a square section influences reduction of operation efficacy of this type of firearm. Calculations were conducted in LS-Dyna system, which is used for oscillation analyses with a finite elements method. In order to solve the motion equation the researchers used an ordinary integration method used for i.e. analyses of highly non-linear oscillation phenomena.
    Źródło:
    Journal of KONES; 2010, 17, 3; 327-332
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of free vibrations of cantilever bars with parabolically variable cross-sections using the Rayleighs method
    Analiza drgań własnych prętów wspornikowych o parabolicznie zmiennych przekrojach poprzecznych przy wykorzystaniu metody Rayleigha
    Autorzy:
    Szlachetka, O.
    Jaworski, J.
    Chalecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/40424.pdf
    Data publikacji:
    2017
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    cantilever bar
    vibration analysis
    free vibration
    cross-section
    Rayleigh's method
    Źródło:
    Acta Scientiarum Polonorum. Architectura; 2017, 16, 4
    1644-0633
    Pojawia się w:
    Acta Scientiarum Polonorum. Architectura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Searching for optimal prestressing of steel bar structures based on sensitivity analysis
    Autorzy:
    Yurchenko, V. V.
    Peleshko, I. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/230774.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optymalizacja parametryczna
    element zbędny
    siła sprężająca początkowa
    sprężenie optymalne
    analiza wrażliwości
    metoda rzutowania gradientowego
    parametric optimization
    redundant member
    initial prestressing force
    optimal prestressing
    sensitivity analysis
    gradient projection method
    Opis:
    The paper considers parametric optimization problems for the steel bar structures formulated as nonlinear programming ones with variable unknown cross-sectional sizes of the structural members, as well as initial prestressing forces introduced into the specified redundant members of the structure. The system of constraints covers load-bearing capacity constraints for all the design sections of the structural members subjected to all the design load combinations at ultimate limit state, as well as displacement constraints for the specified nodes of the bar system, subjected to all design load combinations at serviceability limit state. The method of the objective function gradient projection onto the active constraints surface with simultaneous correction of the constraints violations has been used to solve the parametric optimization problem. A numerical technique to determine the optimal number of the redundant members to introduce the initial prestressing forces has been offered for high-order statically indeterminate bar structures. It reduces the dimension for the design variable vector of unknown initial prestressing forces for considered optimization problems.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 3; 525-540
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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