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Wyświetlanie 1-2 z 2
Tytuł:
Two-Dimensional Drone Base Station Placement in Cellular Networks Using MINLP Model
Autorzy:
Taghavi, Mina
Abouei, Jamshid
Powiązania:
https://bibliotekanauki.pl/articles/227091.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
5G cellular networks
drone base stations
mobile base stations
node placement
Opis:
Utilization of drones is going to become predominated in cellular networks as aerial base stations in order to temporary cover areas where stationary base stations cannot serve the users. Detecting optimal location and efficient number of drone-Base Stations (DBSs) are the targets we tackle in this paper. Toward this goal, we first model the problem using mixed integer non-linear programming. The output of the proposed method is the number and the optimal location of DBSs in a two-dimension area, and the object is to maximize the number of covered users. In the second step, since the proposed method is not solvable using conventional methods, we use a proposed method to solve the optimization problem. Simulation results illustrate that the proposed method has achieved its goals.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 4; 701-706
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new index for damage identification in beam structures based on modal parameters
Autorzy:
Taghipour, Reza
Nashta, Mina Roodgar
Bozorgnasab, Moshen
Mirgolbabaei, Hessam
Powiązania:
https://bibliotekanauki.pl/articles/1845026.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
damage detection
beam
modal parameters
mechanical failure
cracks
finite element model
wykrywanie uszkodzeń
belka
parametry modalne
uszkodzenie mechaniczne
pęknięcia
model elementów skończonych
Opis:
The structural damages can lead to structural failure if they are not identified at early stages. Different methods for detecting and locating the damages in structures have been always appealing to designers in the field. Due to direct relation between the stiffness, natural frequency, and mode shapes in the structure, the modal parameters could be used for the purpose of detecting and locating the damages in structures. In the current study, a new damage indicator named “DLI” is proposed, using the mode shapes and their derivatives. A finite element model of a beam is used, and the numerical model is validated against experimental data. The proposed index is investigated for two beams with different support conditions and the results are compared with those of two well-known indices – MSEBI and CDF. To show the capability and accuracy of the proposed index, the damages with low severity at various locations of the structures containing the elements near the supports were investigated. The results under noisy conditions are investigated by considering 3% and 5% noise on modal data. The results show a high level of accuracy of the proposed index for identifying the location of the damaged elements in beams.
Źródło:
Archive of Mechanical Engineering; 2021, LXVIII, 4; 375-394
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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