Temat: optimization model - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Property identification of viscoelastic solid materials in nomograms using optimization techniques
Autorzy:: de Sousa, T. L.
Kanke, F.
Pereira, J. T.
Bavastri, C. A.
Powiązania:: https://bibliotekanauki.pl/articles/280283.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: identification
optimization
viscoelastic materials
Zener fractional model
Wiechert model
Opis:: Viscoelastic materials have been widely used as devices for vibration control in general. Frequently, dynamic properties of those materials are provided by manufacturers only in a graph form in the frequency domain. This is a recurring problem in industry and academia. Thereby, the goal of this work is to contribute to this important issue which is to obtain the properties of viscoelastic materials from nomograms supplied by the manufacturer. The methodology is based on the digitalization of the nomogram of the material and on the subsequent reading of a set of points from two curves in different temperatures. An optimization problem with simple restrictions is built having characteristic constants of the constitutive models as design variables. The problem is solved by applying a hybrid optimization technique. The results obtained are presented, and prove to be very promising.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1285-1297
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Determination of rheological model coefficients of pipeline composite material layers based on spectrum analysis and optimization
Autorzy:: Bogdevičius, Marijonas
Karpenko, Mykola
Bogdevičius, Paulius
Powiązania:: https://bibliotekanauki.pl/articles/1839709.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: composite material
pipeline
spectrum analysis
rheological model
optimization
Opis:: The article presents theoretical and experimental investigation on properties of a composite material based on rubber. The approach presented in this research is an experimental measurement based on spectrum analysis combined with theoretical investigation held to describe a viscous-elastic behaviour of the material. The proposed mathematical model is represented by five rheological parameters of hybrid Maxwell and Kelvin-Voigt elements and includes an optimization task for determination of the stiffness and damping coefficients. In the proposed rheological model, not only the displacements are unknown but also forces described by second-order differential equations. Validation between the experimental measurement and theoretical investigation is made based on spectrum analysis.
Źródło:: Journal of Theoretical and Applied Mechanics; 2021, 59, 2; 265-278
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A new nondeterministic method for optimal selection of master degrees of freedom for dynamic condensation based on evolutionary optimization
Autorzy:: Mucha, Waldemar
Powiązania:: https://bibliotekanauki.pl/articles/1839637.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: dynamic condensation
optimization
evolutionary algorithm
model order reduction
Opis:: The following paper presents a new method for choosing a set of master degrees of freedom for the process of dynamic condensation in order to reduce a finite element model. The general rule is that the more degrees of freedom are eliminated, the more accurate the reduced model is. However, eliminating different subsets (of equal sizes) of degrees of freedom may influence the accuracy differently. Therefore, choosing an optimal subset is crucial. The presented method is based on multicriterial evolutionary optimization which makes it the first nondeterministic approach based on computational optimization technique for this application.
Źródło:: Journal of Theoretical and Applied Mechanics; 2020, 58, 2; 445-458
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Dynamic analysis of a mechatronic drive system with an induction motor
Autorzy:: Cao, Yongdi
Liu, Xiaohong
Powiązania:: https://bibliotekanauki.pl/articles/2200885.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: dynamic model
electromechanical system
vector control
optimization
rotor
Opis:: The paper presents research findings in the modelling and optimization of dynamic parameters of mechatronic systems with an induction motor. A mathematical model was developed to analyze currents in dynamic states of squirrel-cage rotors in the case of a line-to-line fault. The findings were verified experimentally using calculations for a 1.5 kW three-phase induction motor. The equations for a stationary 0x, 0y coordinate system relating to the stator were derived. The set of design variables selected in the optimization process contained parameters describing design features of the gear shafts and control units settings.
Źródło:: Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 245--258
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Comparison of bayesian and other approaches to the estimation of fatigue crack growth rate from 2D textural features
Autorzy:: Mojzeš, M.
Kukal, J.
Lauschmann, H.
Powiązania:: https://bibliotekanauki.pl/articles/279255.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: quantitative fractography
optimization
heuristic
linear regression
sub-model selection
Opis:: The fatigue crack growth rate can be explained using features of the surface of a structure. Among other methods, linear regression can be used to explain crack growth velocity. Nonlinear transformations of fracture surface texture features may be useful as explanatory variables. Nonetheless, the number of derived explanatory variables increases very quickly, and it is very important to select only few of the best performing ones and prevent overfitting at the same time. To perform selection of the explanatory variables, it is necessary to assess quality of the given sub-model. We use fractographic data to study performance of different information criteria and statistical tests as means of the sub-model quality measurement. Furthermore, to address overfitting, we provide recommendations based on a cross-validation analysis. Among other conclusions, we suggest the Bayesian Information Criterion, which favours sub-models fitting the data considerably well and does not lose the capability to generalize at the same time.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1269-1278
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Modelling and optimation of transmission system with an asynchronous motor
Modelowanie i optymalizacja układów napędowych z silnikami asynchronicznymi
Autorzy:: Mężyk, A.
Powiązania:: https://bibliotekanauki.pl/articles/281127.pdf
Data publikacji:: 2003
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: mathematical model
gear train
electromechanical system
sensitivity analysis
optimization
Opis:: Mathematical models of an electromechanical system with an induction motor are dealt with in the paper. An electric motor model is described in the equivalent axial coordinate system (x, y). The mathematical model of the gear train has been formulated by means of a hybrid method of rigid and deformable finite elements. Special attention has been paid to problems of modelling of planetery gears. The sensitivity analysis and optimization have been carried out using an objective function describing the maximal forces in kinematic pairs. The applied algorithm of direct differentiation makes it possible to examine the influence of parameters of the electromechanical model on the dynamic phenomena occuring in the system. From the performed investigations it appears that, when modelling the mechanisms under consideration, it is necessary to take electromechanical couplings into account.
W pracy omówiono sposób modelowania elektromechanicznych układów napędowych z silnikami indukcyjnymi. Model silnika elektrycznego opisano w zastępczym układzie współrzędnych (x, y). Model matematyczny przekładni zębatej opracowano z wykorzystaniem hybrydowej metody sztywnych i odkształcalnych elementów skończonych. Szczególną uwagę zwrócono na modelowanie przekładni planetarnej. Analizę wrażliwości i optymalizację przeprowadzono dla funkcji celu opisującej wartości maksymalne sił dynamicznych. Zaprezentowana metoda bezpośredniego różniczkowania umożliwia określenie wpływu parametrów silnika napędowego na zjawiska dynamiczne w części mechanicznej.
Źródło:: Journal of Theoretical and Applied Mechanics; 2003, 41, 1; 169-197
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: On the optimum absorber parameters: revising the classical results
Autorzy:: Puzyrov, V.
Awrejcewicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/281548.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: dynamic vibration absorber
Den Hartog’s model
frequency-amplitude curve
optimization
Opis:: The dynamic vibration absorber is a kind of mechanical device with inertia, stiffness, and damping. Once connected to a given structure or machine, it is capable of absorbing vibratory energy. As a result, the primary system can be protected from excessively high vibration levels. In this paper, we deal with classical Den Hartog’s model to clarify the known results and improve the mathematical component of this approach. We suggest the optimal choice of absorber parameters, which is slightly different and more general analytical approach. The comparison of two methods of optimization is carried out, and the corresponding error of calculus is estimated.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 3; 1081-1089
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A study of dynamic hysteresis model for a magnetorheological damper
Autorzy:: Chen, Kun-Yung
Kung, Ming-Lung
Powiązania:: https://bibliotekanauki.pl/articles/2200888.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: identification
LuGre model
magnetorheological damper
self-learning particle
swarm optimization
SLPSO
sliding mode observer
SMO
Opis:: The paper proposes a new dynamic model based on the LuGre model and an electrical equation to describe the hysteresis phenomenon for a magnetorheological (MR) damper. In addition, a sliding mode observer (SMO) is proposed to estimate unmeasurable states of the MR damper. The parameters of the MR damper are successfully identified by using the self-learning particle swarm optimization (SLPSO) algorithm. The contributions of this paper are: i) a new dynamic model based on the LuGre model and an electrical equation for an MR damper is successfully formulated to fit for the hysteresis behavior, ii) the exerted damping force can be practically adjusted by using input voltage for the dynamic model, iii) the SMO is proposed to estimate the internal states and current, and iv) the unknown parameters of the MR damper are successfully identified by using the SLPSO algorithm with a numerical experiment.
Źródło:: Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 259--274
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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