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Wyszukujesz frazę "structural model" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Analysis of structural concrete bar members based on secant stiffness methods
    Autorzy:
    Al-Rumaithi, Ayad
    Fadhil, Aqeel T.
    Salman, Ban Fadhil
    Powiązania:
    https://bibliotekanauki.pl/articles/1839789.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    beton konstrukcyjny
    model numeryczny
    beton sprężony
    secant stiffness
    numerical model
    prestressed
    structural concrete
    Opis:
    In this paper, the behavior of structural concrete linear bar members was studied using numerical model implemented in a computer program written in MATLAB. The numerical model is based on the modified version of the procedure developed by Oukaili. The model is based on real stress-strain diagrams of concrete and steel and their secant modulus of elasticity at different loading stages. The behavior presented by normal force-axial strain and bending moment-curvature relationships is studied by calculating the secant sectional stiffness of the member. Based on secant methods, this methodology can be easily implemented using an iterative procedure to solve non-linear equations. A comparison between numerical and experimental data, illustrated through the strain profiles, stress distribution, normal force-axial strain, and moment-curvature relationships, shows that the numerical model has good numerical accuracy and is capable of predicting the behavior of structural concrete members with different partially prestressing ratios at serviceability and ultimate loading stages.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 1-16
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A synthesis model for forcing action arrangement in the system of reducing dynamic loads of a mobile machine
    Autorzy:
    Kaźmierczak, H.
    Pawłowski, T.
    Zembrowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/265773.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    structural changes
    dynamic susceptibility
    forcing system model
    dynamic mobility
    zmiany strukturalne
    podatność dynamiczna
    drgania
    Opis:
    An idea is presented for a method to lower excessive dynamic loads in the system of supporting structure, mechanical-hydraulic forcing system, vibration isolation system, protective unit. The dynamic characteristics of the system are determined by the method of dynamic susceptibility. An analytical model of the system was built (mobile machine to carry out protective treatments; project WDN-POIG.01.03.01-00-164/09).
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 2; 437-443
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extracting second-order structures from single-input state-space models: application to model order reduction
    Autorzy:
    Guillet, J.
    Mourllion, B.
    Birouche, A.
    Basset, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/907584.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    model drugiego rzędu
    obcinanie zrównoważone
    obcinanie modalne
    second order form model
    preservation of the structural conditions
    balanced truncation
    modal truncation
    Opis:
    This paper focuses on the model order reduction problem of second-order form models. The aim is to provide a reduction procedure which guarantees the preservation of the physical structural conditions of second-order form models. To solve this problem, a new approach has been developed to transform a second-order form model from a state-space realization which ensures the preservation of the structural conditions. This new approach is designed for controllable single-input state-space realizations with real matrices and has been applied to reduce a single-input second-order form model by balanced truncation and modal truncation.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2011, 21, 3; 509-519
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A geometric approach to structural model matching by output feedback in linear impulsive systems
    Autorzy:
    Zattoni, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/330301.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    linear impulsive system
    hybrid system
    model matching
    disturbance decoupling
    geometric approach
    structural properties
    układ liniowy impulsowy
    układ hybrydowy
    dopasowanie modelu
    właściwości strukturalne
    Opis:
    This paper provides a complete characterization of solvability of the problem of structural model matching by output feedback in linear impulsive systems with nonuniformly spaced state jumps. Namely, given a linear impulsive plant and a linear impulsive model, both subject to sequences of state jumps which are assumed to be simultaneous and measurable, the problem consists in finding a linear impulsive compensator that achieves exact matching between the respective forced responses of the linear impulsive plant and of the linear impulsive model, by means of a dynamic feedback of the plant output, for all the admissible input functions and for all the admissible sequences of jump times. The solution of the stated problem is achieved by reducing it to an equivalent problem of structural disturbance decoupling by dynamic feedforward. Indeed, this latter problem is formulated for the so-called extended linear impulsive system, which consists of a suitable connection between the given plant and a modified model. A necessary and sufficient condition for the solution of the structural disturbance decoupling problem is first shown. The proof of sufficiency is constructive, since it is based on the synthesis of the compensator that solves the problem. The proof of necessity is based on the definition and the geometric properties of the unobservable subspace of a linear impulsive system subject to unequally spaced state jumps. Finally, the equivalence between the two structural problems is formally established and proven.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2018, 28, 1; 25-38
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probabilities of discrepancy between minima of cross-validation, Vapnik bounds and true risks
    Autorzy:
    Klęsk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/929593.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    estymacja regresji
    walidacja krzyżowa
    teoria uczenia się
    generalizacja
    teoria statystyczna
    regression estimation
    model comparison
    complexity selection
    cross-validation
    generalization
    statistical learning theory
    generalization bounds
    structural risk minimization
    Opis:
    Two known approaches to complexity selection are taken under consideration: n-fold cross-validation and structural risk minimization. Obviously, in either approach, a discrepancy between the indicated optimal complexity (indicated as the minimum of a generalization error estimate or a bound) and the genuine minimum of unknown true risks is possible. In the paper, this problem is posed in a novel quantitative way. We state and prove theorems demonstrating how one can calculate pessimistic probabilities of discrepancy between these minima for given for given conditions of an experiment. The probabilities are calculated in terms of all relevant constants: the sample size, the number of cross-validation folds, the capacity of the set of approximating functions and bounds on this set. We report experiments carried out to validate the results.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2010, 20, 3; 525-544
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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