Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "genetic algorithms" wg kryterium: Wszystkie pola


Wyświetlanie 1-7 z 7
Tytuł:
Application of genetic algorithms for the estimation of hydraulic conductivity
Autorzy:
Bartlewska-Urban, M.
Strzelecki, T.
Powiązania:
https://bibliotekanauki.pl/articles/178471.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
genetic algorithms
hydraulic conductivity
Biot consolidation model
Opis:
In the study described here model calibration was performed employing the inverse analysis using genetic algorithms (GA). The objective of analysis is to determine value of the coefficient of hydraulic conductivity, k. The commonly used method for the determination of coefficient of hydraulic conductivity based on Terzaghi consolidation leads to an underestimation of the value of k as the Terzaghi model does not take into account the deformation of soil skeleton. Here, an alternative methodology based on genetic algorithms is presented for the determination of the basic parameters of Biot consolidation model. It has been demonstrated that genetic algorithms are a highly effective tool enabling automatic calibration based on simple rules. The values of the coefficient of hydraulic conductivity obtained with GA are of at least one order smaller than values obtained with the Terzaghi model.
Źródło:
Studia Geotechnica et Mechanica; 2018, 40, 2; 140-146
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-criteria human resources planning optimisation using genetic algorithms enhanced with MCDA
Autorzy:
Jurczak, Marcin
Miebs, Grzegorz
Bachorz, Rafał A.
Powiązania:
https://bibliotekanauki.pl/articles/2204085.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
mathematical optimisation
multi-criteria optimisation
scheduling
job shop problem
MCDA
Opis:
The main objective of this paper is to present an example of the IT system implementation with advanced mathematical optimisation for job scheduling. The proposed genetic procedure leads to the Pareto front, and the application of the multiple criteria decision aiding (MCDA) approach allows extraction of the final solution. Definition of the key performance indicator (KPI), reflecting relevant features of the solutions, and the efficiency of the genetic procedure provide the Pareto front comprising the representative set of feasible solutions. The application of chosen MCDA, namely elimination et choix traduisant la réalité (ELECTRE) method, allows for the elicitation of the decision maker (DM) preferences and subsequently leads to the final solution. This solution fulfils all of the DM expectations and constitutes the best trade-off between considered KPIs. The proposed method is an efficient combination of genetic optimisation and the MCDA method.
Źródło:
Operations Research and Decisions; 2022, 32, 4; 57--74
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optymalizacja rozmytego filtru Kalmana przy wykorzystaniu algorytmów genetycznych
Application of the genetic algorithms for optimization of the fuzzy Kalman filter
Autorzy:
Dróżdż, K.
Powiązania:
https://bibliotekanauki.pl/articles/1813788.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
algorytm genetyczny
optymalizacja
filtr Kalmana
układ dwumasowy
Opis:
This paper deals with a problem of a fuzzy Kalman filter optimization for an adaptive control structure of a two-mass drive system. In the introduction section of this paper modern control structures of electrical drives with elastic joint are discussed. For their application state variables estimation of a dynamic object are required. A particular attention is given to the observers based on the Kalman filter theory. Additionally, the problematic aspects of the observer applying design by using genetic algorithm are considered. Moreover, the remainder of the paper is organized as follows. First, the object of research and its mathematical model are described. Subsequently, genetic algorithms are discussed. Next, the optimization process of the fuzzy Kalman filter using genetic algorithms is presented. The simulation results of the drive performance in a open and closed-loop control structure are shown.
Źródło:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2013, 69, 33; 141--155
1733-0718
Pojawia się w:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of composite load model parameters as a constrained nonlinear problem
Autorzy:
Regulski, P.
Powiązania:
https://bibliotekanauki.pl/articles/410597.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
composite load model
nonlinear optimization
nonlinear least squares
genetic algorithms
sequential quadratic programming
Opis:
This paper presents the results of application of sequential quadratic programming to the estimation of the unknown composite load model parameters. Traditionally applied estimation methods, such as nonlinear least squares or genetic algorithms, suffer from a number of issues. Genetic algorithms exhibit premature convergence and require high computational resources and nonlinear least squares method is very sensitive to the initial guess and can diverge easily. This paper provides a comparison of all three methods based on computer-generated signals serving as field measurements. Accuracy and precision are assessed as well as computational requirements.
Źródło:
Present Problems of Power System Control; 2015, 6; 33-42
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal screw orientation for the fixation of cervical degenerative disc disease using nonlinear C3-T2 multi-level spinal models and neuro-genetic algorithms
Autorzy:
Chang, T.-K.
Hsu, C.-C.
Chen, K.-T.
Powiązania:
https://bibliotekanauki.pl/articles/306375.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
stabilizacja
optymalizacja
kątownik
bioinżynieria
cervical plate
insertion angle
fixation stability
optimization
Opis:
Purpose: Anterior cervical discectomy and fusion is a common surgical procedure performed to remove a degenerative or herniated disc in cervical spine. Unfortunately, clinical complications of anterior cervical plate (ACP) systems still occur, such as weak fixation stability and implant loosening. Previous researchers have attempted to ameliorate these complications by varying screw orientations, but the screw orientations are mainly determined according to the investigator’s experiences. Thus, the aim of this study was to discover the optimal screw orientations of ACP systems to achieve acceptable fixation stability using finite element simulations and engineering algorithms. Methods: Three-dimensional finite element models of C3-T2 multi-level segments with an ACP system were first developed to analyze the fixation stability using ANSYS Workbench 14.5. Then, artificial neural networks were applied to create one objective function, and the optimal screw orientations of an ACP system were discovered by genetic algorithms. Finally, the numerical models and the optimization study were validated using biomechanical tests. Results: The results showed that the optimal design of the ACP system had highest fixation stability compared with other ACP designs. The neuro-genetic algorithm has effectively reduced the time and effort required for discovering for the optimal screw orientations of an ACP system. Conclusions: The optimum screw orientation of the ACP system could be successfully discovered, and it revealed excellent fixation stability for the treatment of cervical degenerative disc disease. This study could directly provide the biomechanical rationale and surgical suggestion to orthopedic surgeons.
Źródło:
Acta of Bioengineering and Biomechanics; 2015, 17, 3; 59-66
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generatywna optymalizacja w planowaniu przestrzennym – koncept miasta przyjaznego ruchowi pieszemu
Generative design optimization in urban planning – walkability-optimized city concept
Autorzy:
Cichocka, J
Powiązania:
https://bibliotekanauki.pl/articles/293886.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
projektowanie generatywne
optymalizacja
przyjazność dla ruchu pieszego
walk score
algorytmy genetyczne
generative design
optimization
walkability
genetic algorithms
Opis:
W artykule zaprezentowano analizę urbanistyczną oraz koncepcyjny projekt stworzony z użyciem oprogramowania Rhinoceros/Grasshopper, solvera Galapagos oraz wtyczek ShortWalk i Elk. Badania zostały przeprowadzone w ramach 15. sesji międzynarodowych warsztatów International Baikal Winter University of Urban Planning 2014 i bazują na autentycznym kontekście urbanistycznym Irkucka (luty 2014). Celem pracy jest zaproponowanie algorytmu optymalizacyjnego, który pozwoli na przekształcenie istniejących struktur urbanistycznych w dzielnice osiągalne na piechotę. Stworzony na potrzeby projektu algorytm w aplikacji Grasshopper wykorzystuje zaadaptowany kalkulator przyjazności dla pieszych (oryginalnie WalkScore®) do oszacowania wyników walk score dla poszczególnych zabudowań mieszkalnych, a następnie przy użyciu ewolucyjnego narzędzia do rozwiązywania matematycznych problemów wyszukuje optymalne lokalizacje dla nowych funkcji usługowych w taki sposób, aby zmaksymalizować średnią wyników walk score. Jako wynik implementacji algorytmu w zadanym problemie w dalszej części artykułu przedstawiono konceptualny projekt przyjaznej ruchowi pieszemu dzielnicy. We wnioskach przedyskutowano zalety i wady zaproponowanego algorytmu, wynikowy projekt, a także wskazówki dla dalszych badań.
This paper presents an urban analysis and design workflow using Rhinoceros/Grasshopper with evolutionary solver Galapagos and add-ons: Shortest Walk (ShortWalk) and Elk. The research is based on the authentic urban situation in the city of Irkutsk and was conducted within the 15th session of the International Baikal Winter University of Urban Planning 2014. The aim of the research is to propose a workflow, which reforms some part of the existing urban structure into walkable neighborhood. The study uses a walkability calculator to estimate the walk scores for the residential buildings within the design perimeter and applies genetic algorithms to point out the location of the new amenities to maximize the average of the particular walk scores. As a result, the conceptual project of walkable-optimized neighborhood is proposed. The conclusions show the limitations and potentials of the applied algorithm, discuss the resulting project and outline future research.
Źródło:
Architectus; 2015, 1(41); 119-128
1429-7507
2084-5227
Pojawia się w:
Architectus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected Nature-Inspired Algorithms in Function of PM Synchronous Motor Cogging Torque Minimisation
Autorzy:
Cvetkovski, Goga Vladimir
Petkovska, Lidija
Powiązania:
https://bibliotekanauki.pl/articles/1955984.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
permanent magnet synchronous motor
optimisation method
cogging torque
genetic algorithm
finite element method
Opis:
Both permanent magnet brushless DC motors and permanent magnet synchronous motors have attracted wide attention and are increasingly used in industrial high-performance applications in recent years. Those motors are known for their good electrical, magnetic and performance characteristics, but there is one parameter known as cogging torque that has a negative influence on the performance characteristics of the motor. This pulsating torque is generated as a result of the interaction between the stator teeth and the permanent magnets. The minimisation of the ripple of this torque in those permanent magnet motors is of great importance and is generally achieved by a special motor design which in the design process involves a variety of many geometrical motor parameters. In this research work, a novel approach will be introduced where two different nature-inspired algorithms, such as genetic algorithm (GA) and cuckoo search (CS) algorithm are used as an optimisation tool, in which the defined equation for the maximum value of the cogging torque is applied as an objective function. Therefore, a proper mathematical presentation of the maximum value of the cogging torque for the analysed synchronous motor is developed and implemented in the research work. For a detailed analysis of the three different motor models, the initial motor and the two optimised motor models are modelled and analysed using a finite element method approach. The cogging torque is analytically and numerically calculated and the results for all the models are presented.
Źródło:
Power Electronics and Drives; 2021, 6, 41; 204-217
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

    Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies