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Wyświetlanie 1-4 z 4
Tytuł:
Approximate method for determination of dynamic characteristics of structures with viscoelastic dampers
Autorzy:
Lewandowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/127718.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
structures
viscoelastic damper
generalized fractional model
dynamic characteristics
struktury
tłumik lepkosprężysty
uogólniony model ułamkowy
charakterystyka dynamiczna
Opis:
An approximate method for determination of dynamic characteristics of structures with viscoelastic dampers is proposed in this paper. A fractional derivative is used to describe the dynamic behaviour of viscoelastic dampers. The method is based on a continuous dependency of the sensitivity of eigenvalue on a certain artificially introduced parameter which scaled up the influence of the damping term in the eigenvalue problem. Some results of a representative calculation are also presented and briefly discussed.
Źródło:
Vibrations in Physical Systems; 2016, 27; 219-226
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic characteristics of the structure with viscoelastic dampers combined with inerters and subjected to temperature changes
Autorzy:
Pawlak, Zdzisław M.
Lewandowski, Roman
Powiązania:
https://bibliotekanauki.pl/articles/2146557.pdf
Data publikacji:
2020
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
viscoelastic damper
inerter
temperature
fractional derivative
nonlinear eigenvalue problem
tłumik lepkosprężysty
temperatura
pochodna ułamkowa
nieliniowe zagadnienie własne
Opis:
The purpose of the work is dynamic analysis of passive dampers used in structural systems to reduce excessive vibrations caused by wind or earthquakes. Special systems are considered that contain inerter, i.e. device using rotational inertia, in combination with a viscoelastic damper. The so-called fractional models of viscoelastic dampers describe their dynamic behavior in a wide frequency range using a small number of model parameters. To describe material behavior over a wider frequency range, the time-temperature superposition principle is used. The shifting factor is calculated from the well-known William-Landel-Ferry formula. This allows for determination of damper parameters at any temperature based on the parameters obtained at the reference temperature. Laplace transformation of the derived equations of motion leads to the non-linear eigenproblem, which could be solved using the continuation method. The influence of temperature on the dynamic characteristics of the system is examined.
Źródło:
Vibrations in Physical Systems; 2020, 31, 2; art. no. 2020222
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Viscoelastic Material as Energy Dissipater Viscoelastic Damper for Building Structures to Mitigate the Seismic Vibration
Autorzy:
Sarwar, Waseem
Powiązania:
https://bibliotekanauki.pl/articles/396698.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
viscoelastic material
viscoelastic damper
dynamic mechanical analysis
dynamic properties
seismic control
materiał lepkosprężysty
tłumik lepkosprężysty
dynamiczna analiza mechaniczna
właściwości dynamiczne
kontrola sejsmiczna
Opis:
The supplemental energy dissipation system is a practical approach to attenuate the structural response under extreme loading. Viscoelastic damping used to reinforce the structure against the seismic vibration, Viscoelastic material (VEM) most commonly used in viscoelastic dampers (VEDs). In this paper, dynamic mechanical analysis (DMA) approach is used to investigate the performance index of VEM. It is demonstrated that the performance index, such as storage modulus, loss modulus, and loss factor decrease noticeably as the temperature increases, which reflects the low stiffness at high temperature. Excitation frequency also influenced the performance index, and the reaction has correspondence to temperature. As the temperature increases, the VEM dynamic properties decreases, which represents the rubbery region, and it is found that higher to low-temperature dynamic properties increases, which the glassy region is. DMA is a particularly flexible approach, and it characterizes the properties of VEM simultaneously at various conditions.
Źródło:
Civil and Environmental Engineering Reports; 2019, 29, 2; 41-49
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of temperature on dynamic properties of plates with viscoelastic dampers
Autorzy:
Lenartowicz, Agnieszka
Przychodzki, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2146607.pdf
Data publikacji:
2020
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
thin plates
free damped vibrations
viscoelastic damper
finite element method
frequency-temperature correspondence principle
continuation method
cienkie płyty
drgania swobodne
tłumik lepkosprężysty
metoda elementów skończonych
zasada odpowiedniości
metoda kontynuacyjna
Opis:
The free damped vibrations of thin (Kirchhoff-Love) plates equipped with viscoelastic dampers are considered in the paper. It is assumed that the dampers are described according to the generalized rheological model. Influence of temperature on the parameters of dampers is taken into account using the frequency-temperature correspondence principle. Isotropic and rectangular plates are analysed in numerical tests included in this study. The natural frequencies and non-dimensional damping ratios are determined for these plates by solving the non-linear eigenproblem using the continuation method. The Finite Element Method is used to determine the stiffness matrix and the mass matrix occurring in the considered eigenproblem. The results of exemplary numerical calculations are presented and discussed at the end of this paper.
Źródło:
Vibrations in Physical Systems; 2020, 31, 3; art. no. 2020310
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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