Autor: Łasecka-Plura, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Design sensitivity analysis of frequency response functions and steady-state response for structures with viscoelastic dampers
Autorzy:: Łasecka-Plura, M.
Lewandowski, R.
Powiązania:: https://bibliotekanauki.pl/articles/127950.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:: fractional models of VE dampers
dynamic characteristics
design sensitivity
amortyzatory
charakterystyka dynamiczna
wrażliwość projektowa
Opis:: In this paper, the design sensitivity of the frequency response function and amplitudes of the steady-state vibration of planar frames with viscoelastic (VE) dampers mounted on them is considered. The dampers are modeled using a five-parameter rheological model with fractional derivatives. The design sentisivity with respect to change of damper parameter is analyzed in detail. The direct method is used to determine the first and the second order sensitivities. Moreover, the results of typical calculations are presented and discussed.
Źródło:: Vibrations in Physical Systems; 2014, 26; 129-136
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Modal analysis of frame structures with semi-rigid joints and viscoelastic connections modeled by fractional derivatives
Autorzy:: Pawlak, Z. M.
Łasecka-Plura, M.
Zak-Sawiak, M.
Powiązania:: https://bibliotekanauki.pl/articles/38697100.pdf
Data publikacji:: 2023
Wydawca:: Instytut Podstawowych Problemów Techniki PAN
Tematy:: viscoelastic connection
rotational damping
rheological fractional model
dynamic characteristics of structure
modified finite element
Opis:: The paper presents two methods of solving the problem of the dynamics of a frame structure with viscoelastic bonds in nodes. In the first approach, known from the literature, two-node beam elements with three degrees of freedom in each node were used. Exact shape functions were adopted to obtain a stiffness matrix, a consistent mass matrix and a damping matrix for the beam element. These matrices were then modified by introducing rotational viscoelastic constraints at the boundary nodes. In the second approach, a new method of modelling viscoelastic bonds in frame structures was proposed. It consists in removing rigid bonds between elements along selected degrees of freedom and replacing them with a new, additional element with viscoelastic properties. This approach allows the use of any rheological model to describe viscoelastic bonds (i.e. an additional element) without the need to create a new modified finite element. In this work, an advanced rheological model, i.e. the fractional Kelvin model, was used to describe rotational viscoelastic bonds. The use of fractional derivatives to describe the damping properties reduces the number of parameters needed in the model, but leads to a non-linear eigenproblem. In order to solve the eigenvalue problem, the continuation method was used, and the dynamic characteristics of the structure were determined on the basis of the calculated eigenvalues. Selected structures with viscoelastic nodes were analyzed and the obtained results confirm the effectiveness of the proposed approach.
Źródło:: Archives of Mechanics; 2023, 75, 3; 337-363
0373-2029
Pojawia się w:: Archives of Mechanics
Dostawca treści:: Biblioteka Nauki

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