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Wyszukujesz frazę "simulated annealing algorithm" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
Identification of Sound Power Levels and Surface Absorption Coefficients in Multi-Source Industrial Buildings by Using a Simplified Diffusion Model
Autorzy:
Sequeira, M. E.
Cortínez, V. H.
Powiązania:
https://bibliotekanauki.pl/articles/177679.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
industrial noise
noise source identification
sound absorption coefficient
two-dimensional acoustic diffusion model
simulated annealing algorithm
Opis:
This article deals with the identification of sound powers and absorption surface coefficients in multisource industrial buildings from the knowledge of the sound pressure levels (SPLs) at several monitoring points. This inverse problem is formulated as one of optimisation in which the objective function is the difference between the measured and predicted SPLs. The methodology combines the use of a simplified acoustic diffusion model with the simulated annealing optimisation technique. The former is a recently developed model for estimating the SPLs in a fast and sufficiently accurate form. The low computational cost of the model constitutes the major advantage for the optimisation procedure due to the great numer of simulations required. Numerical examples are given to show the efficiency of the proposed approach.
Źródło:
Archives of Acoustics; 2018, 43, 1; 93-102
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating ground vibration to calculate the permissible charge weight for blasting operations of Gotvand-Olya dam underground structures
Badania drgań gruntu w celu określenia dopuszczalnego ciężaru ładunku wybuchowego przy pracach strzałowych w podziemnych elementach tamy w Gotvand-Olya
Autorzy:
Soltani-Mohammadi, S.
Amnieh, H. B.
Bahadori, M.
Powiązania:
https://bibliotekanauki.pl/articles/219562.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
prace strzałowe
drgania podłoża
maksymalna prędkość drgań cząstek (PPV)
algorytm hybrydowy
blasting
ground vibration
peak particle velocity
simulated annealing algorithm
Opis:
Ground vibration, air vibration, fly rock, undesirable displacement and fragmentation are some inevitable side effects of blasting operations that can cause serious damage to the surrounding environment. Peak Particle Velocity (PPV) is the main criterion in the assessment of the amount of damage caused by ground vibration. There are different standards for the determination of the safe level of the PPV. To calculate the permissible amount of the explosive to control the damage to the underground structures of Gotvand Olya dam, use was made of sixteen 3-component (totally 48) records generated from 4 blasts. These operations were recorded in 3 directions (radial, transverse and vertical) by four PG-2002 seismographs having GS-11D 3-component seismometers and the records were analyzed with the help of the DADISP software. To predict the PPV, use was made of the scaled distance and the Simulated Annealing (SA) hybrid methods. Using the scaled distance resulted in a relation for the prediction of the PPV; the precision of the relation was then increased to 0.94 with the help of the SA hybrid method. Relying on the high correlation of this relation and considering a minimum distance of 56.2 m to the center of the blast site and a permissible PPV of 178 mm/s (for a 2-day old concrete), the maximum charge weight per delay came out to be 212 Kg.
Drgania gruntu, rozchodzenie się drgań w powietrzu, rozrzut skał, ich niepożądane przemieszczenia i rozdrobnienie to nieuchronne skutki prowadzenia prac strzałowych, które spowodować mogą poważne spustoszenie w środowisku naturalnym. Maksymalna prędkość drgań cząstek (PPV) to główne kryterium przy ocenie szkód spowodowanych przez drgania podłoża. Istnieje wiele norm określających bezpieczne poziomy prędkości drgań cząstek (PPV). Obliczenie dopuszczalnej wielkości ładunku wybuchowego w taki sposób, by zapobiegać uszkodzeniom podziemnych elementów tamy Gotvand Olya opiera się na wykorzystaniu 16 3-elementowych zestawów danych zarejestrowanych w trakcie 4 wybuchów. Procedura rejestracji obejmuje zapisy drgań w 3 kierunkach (promieniowe, poprzeczne i pionowe) zarejestrowane przez 4 sejsmografy wyposażone w sejsmometry GS-11D, zaś same zapisy analizowano przy wykorzystaniu oprogramowania DADISP. Przewidywanie prędkości drgań cząstek odbywa się w oparciu o skalowanie odległości oraz metody hybrydowe Simulated Annealing (S.A.). W wyniku skalowania odległości otrzymujemy wzorów na prędkość drgań cząstek, przy wykorzystaniu metod hybrydowych dokładność obliczeń wzrasta do 0.94. Wykorzystując wysoki stopień korelacji wynikający ze wzoru, uwzględniając minimalną odległość 56.2 m od epicentrum wybuchu oraz dozwolony poziom prędkości drgań cząstek gruntu 178 mm/s (dla dwudniowego betonu), otrzymujemy maksymalną wielkość ładunku na pojedynczy wystrzał na poziomie 212 Kg.
Źródło:
Archives of Mining Sciences; 2012, 57, 3; 687-697
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizations of network layout and transport service frequencies in view of interests of transit line operators and utilizers
Autorzy:
Zhu, Xiaojing
Feng, Xuesong
Zhang, Lukai
Hua, Weixin
Powiązania:
https://bibliotekanauki.pl/articles/223857.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transit network layout design
transportation service
service optimization
interests of transit line operators
interests of utilizers
simulated annealing algorithm
genetic algorithm
projekt układu sieci transportowej
usługi transportowe
optymalizacja usług
interesy operatorów linii tranzytowych
interes użytkowników
algorytm genetyczny
Opis:
Layouts of bus networks in cities are always irrational currently, transport service frequencies also need to be optimized according to the real network layouts, operation conditions and travel experience of passengers, so it is essential to optimize bus transit network layouts and transport service frequencies systematically. Different stakeholders are involved in the optimization of urban bus transit network layouts like the government, operators and passengers, whose interests are always contradictory. In order to optimize transit network layout and service frequencies from the view point of operators and utilizers, this research constructs a multi-objective model and proposes a solution algorithm. The proposed multi-objective model is established from the perspective of operators with the goal of minimizing total operating costs for one day, and from the perspective of the utilizers to minimize the total travel time, respectively. Also with the application of electric bus in cities, buses in this research are electric buses all for green travel. Moreover, a solution algorithm is proposed in this research to solve the proposed multi-objective model with simulated annealing algorithm and genetic algorithm. Simulated annealing algorithm is used as the main framework of the solution algorithm from the perspective of operators to minimize operating costs, while genetic algorithm is used as the subroutine of simulated annealing algorithm to optimize total travel time. Verification of the proposed model and the solution algorithm is based on an intuitive network. The application results of a numerical experiment verified that the proposed optimization model and the solution algorithm are able to optimize the network layout and service frequencies at the same time.
Źródło:
Archives of Transport; 2019, 50, 2; 47-55
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of thermo-electric coolers using hybrid genetic algorithm and simulated annealing
Autorzy:
Khanh, D. V. K.
Vasant, P.
Elamvazuthi, I.
Dieu, V. N.
Powiązania:
https://bibliotekanauki.pl/articles/230105.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermo-electric coolers
genetic algorithm
simulated annealing
coefficient of performance
rate of refrigeration
fitness function
Opis:
Thermo-electric Coolers (TECs) nowadays are applied in a wide range of thermal energy systems. This is due to their superior features where no refrigerant and dynamic parts are needed. TECs generate no electrical or acoustical noise and are environmentally friendly. Over the past decades, many researches were employed to improve the efficiency of TECs by enhancing the material parameters and design parameters. The material parameters are restricted by currently available materials and module fabricating technologies. Therefore, the main objective of TECs design is to determine a set of design parameters such as leg area, leg length and the number of legs. Two elements that play an important role when considering the suitability of TECs in applications are rated of refrigeration (ROR) and coefficient of performance (COP). In this paper, the review of some previous researches will be conducted to see the diversity of optimization in the design of TECs in enhancing the performance and efficiency. After that, single-objective optimization problems (SOP) will be tested first by using Genetic Algorithm (GA) and Simulated Annealing (SA) to optimize geometry properties so that TECs will operate at near optimal conditions. Equality constraint and inequality constraint were taken into consideration.
Źródło:
Archives of Control Sciences; 2014, 24, 2; 155-176
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Artificial immune system in planning deliveries in a short time
Autorzy:
Mrówczyńska, B.
Król, A.
Czech, P.
Powiązania:
https://bibliotekanauki.pl/articles/200739.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
artificial immune system
genetic algorithm
simulated annealing
open vehicle routing problem
on-time delivery
Taguchi method
Opis:
In the calculations presented in the article, an artificial immune system (AIS) was used to plan the routes of the fleet of delivery vehicles supplying food products to customers waiting for the delivery within a specified, short time, in such a manner so as to avoid delays and minimize the number of delivery vehicles. This type of task is classified as an open vehicle routing problem with time windows (OVRPWT). It comes down to the task of a traveling salesman, which belongs to NP-hard problems. The use of the AIS to solve this problem proved effective. The paper compares the results of AIS with two other varieties of artificial intelligence: genetic algorithms (GA) and simulated annealing (SA). The presented methods are controlled by sets of parameters, which were adjusted using the Taguchi method. Finally, the results were compared, which allowed for the evaluation of all these methods. The results obtained using AIS proved to be the best.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 5; 969-980
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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