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Wyświetlanie 1-10 z 281
Tytuł:
Mechanical annealing model of damage in arrays of nanopillars
Autorzy:
Derda, T.
Powiązania:
https://bibliotekanauki.pl/articles/122700.pdf
Data publikacji:
2013
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
nanopillars
fibre bundle model
mechanical annealing
Opis:
The mechanical damage accumulation occurring in an array of axially loaded nanopillars is studied within the stochastic approach. To each nanopillar, an initial strength--threshold is assigned which is drawn from the Weibull probability distribution. Under the influence of load exceeding the strength-threshold the pillar height is reduced. Then the reduced pillar gets new higher strength-threshold and its load is transferred to other working pillars. We analyse slip loads causing the system height reductions and avalanches of the pillar height reductions.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2013, 12, 4; 31-40
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optymalizacja procesu odprężania wyrobów szklanych formowanych ręcznie w odprężarce komorowej elektrycznej
The optimization of the annealing process of hand formed glass in electric annealing furnace
Autorzy:
Woźniak, M.
Skorek, A.
Powiązania:
https://bibliotekanauki.pl/articles/168061.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
Tematy:
szkło artystyczne
odprężanie
naprężenia wewnętrzne
odprężarka
artistic glass
annealing
interior stresses
annealing furnace
Opis:
Prowadzenie procesu odprężania szkła nie jest proste w sytuacji, gdy w zakładzie wytwarzane są przedmioty o różnorodnym kształcie i wielkości, ze szkła dmuchanego i szkła pełnego, w małych seriach. Taka produkcja wymaga zoptymalizowania procesu obróbki cieplnej (odprężania), ponieważ wyroby z pełnego szkła – takie jak galanteria szklana – przy zbyt wysokiej górnej temperaturze odprężania mogą ulegać deformacjom (są jeszcze plastyczne). Z kolei zbyt niska temperatura procesu nie pozwala na eliminację naprężeń wewnętrznych. W artykule przedstawiono, w jaki sposób wyniki badań naprężeń wewnętrznych przeprowadzonych dla kilku reprezentatywnych wyrobów produkowanych w krakowskim Oddziale Instytutu Ceramiki i Materiałów Budowlanych wpłynęły na zmianę prowadzenia procesu odprężania szkła.
Conducting of the glass annealing process is not an easy one in a situation when in a factory artefacts of different shapes and sizes are produced, from blown and from thick glass, in short series. This kind of production requires the optimization of annealing process because the artefacts from thick glass – glass animals, flowers, paperweights can be distorted due to too high upper annealing temperature. Excessively low upper annealing temperature, by contrast, precludes the release of interior stresses. The paper presents the results of interior stresses tests conducted for several representative artefacts produced in Kraków Division of Institute of Ceramics and Building Materials and shows how they influenced the conducting of the glass annealing process.
Źródło:
Szkło i Ceramika; 2017, R. 68, nr 3, 3; 11-14
0039-8144
Pojawia się w:
Szkło i Ceramika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of simulated annealing method for optimization of fractional order PID controller
Autorzy:
Mikulski, S.
Powiązania:
https://bibliotekanauki.pl/articles/97234.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
fractional order controller
optimization
fractional calculus
simulated annealing
Opis:
The paper describes method of parameters selection for control system with fractional order PIλDμ controller steering second order oscillated object. As a selection algorithm was used simulated annealing optimization method with random variant of cooling strategy. As a target function for optimization was selected Integral Squared Error (ISE).
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 178-187
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effective Design of the Simulated Annealing Algorithm for the Flowshop Problem with Minimum Makespan Criterion
Autorzy:
Hurkała, J.
Hurkała, A.
Powiązania:
https://bibliotekanauki.pl/articles/309187.pdf
Data publikacji:
2012
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
flowshop
heuristics
makespan
simulated annealing
Opis:
In this paper we address the n-job, m-machine flowshop scheduling problem with minimum completion time (makespan) as the performance criterion. We describe an efficient design of the Simulated Annealing algorithm for solving approximately this NP-hard problem. The main difficulty in implementing the algorithm is no apparent analogy for the temperature as a parameter in the flowshop combinatorial problem. Moreover, the quality of solutions is dependent on the choice of cooling scheme, initial temperature, number of iterations, and the temperature decrease rate at each step as the annealing proceeds. We propose how to choose the values of all the aforementioned parameters, as well as the Boltzmann factor for the Metropolis scheme. Three perturbation techniques are tested and their impact on the solutions quality is analyzed. We also compare a heuristic and randomly generated solutions as initial seeds to the annealing optimization process. Computational experiments indicate that the proposed design provides very good results - the quality of solutions of the Simulated Annealing algorithm is favorably compared with two different heuristics.
Źródło:
Journal of Telecommunications and Information Technology; 2012, 2; 92-98
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of groundwater quality monitoring network using information theory and simulated annealing algorithm
Autorzy:
Treichel, W.
Kucharek, M.
Powiązania:
https://bibliotekanauki.pl/articles/2063028.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
simulated annealing
monitoring network
information theory
optimization
entropy
Opis:
In this paper a methodology of assessment and optimization of groundwater quality monitoring network which takes into account the evaluation criteria derived from the Shannon information theory is presented. The fundamental criteria derived from this theory are: (1) the value of marginal information entropy, which is a measure of the amount of information containing in the data in a location of sampling point, and (2) the value of transinformation (mutual information) which measures the amount of information shared between each of two sampling points. Transinformation can be interpreted as an index of the stochastic dependence between the random variables corresponding to groundwater quality data recorded in different sampling points of monitoring network and shows the reduction of uncertainty included in one variable due to the knowledge of the other variable. In the optimization problem the objective function involving the value of transinformation of the investigated water quality parameters (Cl, Cu, Na) is minimized. To minimize the objective function the simulated annealing algorithm, which allows to find a satisfactory sub-optimal solution, was used. The proposed methodology was applied to optimize the groundwater monitoring network of contaminant reservoir Żelazny Most, one of the worlds biggest industrial waste disposal site, which collects post-flotation contaminants originating from copper ore treatment. The results show an increase in the effectiveness of the monitoring network by reducing the number of sampling points while maintaining an acceptable amount of information available in the network.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2010, 441 Hydrogeologia z. 10; 193--199
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shape optimization of road tunnel cross-section by simulated annealing
Autorzy:
Sobótka, M.
Pachnicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/178948.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
simulated annealing
underground excavation
shape optimization
linear elasticity
energy of volumetric strain
Opis:
The paper concerns shape optimization of a tunnel excavation cross-section. The study incorporates optimization procedure of the simulated annealing (SA). The form of a cost function derives from the energetic optimality condition, formulated in the authors’ previous papers. The utilized algorithm takes advantage of the optimization procedure already published by the authors. Unlike other approaches presented in literature, the one introduced in this paper takes into consideration a practical requirement of preserving fixed clearance gauge. Itasca Flac software is utilized in numerical examples. The optimal excavation shapes are determined for five different in situ stress ratios. This factor significantly affects the optimal topology of excavation. The resulting shapes are elongated in the direction of a principal stress greater value. Moreover, the obtained optimal shapes have smooth contours circumscribing the gauge.
Źródło:
Studia Geotechnica et Mechanica; 2016, 38, 2; 47-52
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Diffusion Annealing on Borides Layers Produced on XC38 Steel
Autorzy:
Rayane, K.
Allaoui, O.
Allaoui, A.
Powiązania:
https://bibliotekanauki.pl/articles/1031131.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
boriding
molten salts
annealing diffusion
XC38 steel
Opis:
In this work, we present a study of the effect of diffusion annealing at 700°C for 1 h on the nature and properties of boride layers obtained on XC38 steel through a molten salt consisting of borax (Na₂B₄O₇) and boron carbide (B₄C). We evaluated the changes brought by the diffusion annealing on the morphology of the boride layer, the thickness of this layer, the distribution of elements in the steel, and the hardness. Comparing the results obtained allowed concluding that the diffusion annealing will completely transform the two-phase layer formed of FeB and Fe₂B borides in a single-phase layer consisting of single boride Fe₂B. The transformation of the two-phase boride into a single-phase boride is done with an increase in thickness of about 30% compared to the initial thickness of the sample. The values of Si concentration obtained in the underlying zone after the diffusion annealing treatment are more important than those obtained in the same underlying zone of samples borided directly by immersion in molten salt consisting of borax and silicon carbide (SiC).
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 521-523
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sequential simulated annealing for the vehicle routing problem with time windows
Autorzy:
Woch, M.
Łebkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/375944.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
simulated annealing
vehicle routing problem with time windows
bi-criterion optimization
Opis:
This article presents a new simulated annealing algorithm that provides very high quality solutions to the vehicle routing problem. The aim of described algorithm is to solve the vehicle routing problem with time windows. The tests were carried out with use of some well known instances of the problem defined by M. Solomon. The empirical evidence indicates that simulated annealing can be successfully applied to bi-criterion optimization problems.
Źródło:
Decision Making in Manufacturing and Services; 2009, 3, 1-2; 87-100
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Possibilities of Using Forging Heat in Isothermal Annealing Processes for AISI 4140 Alloy
Autorzy:
Zwierzchowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/352575.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AISI 4140 steel
isothermal annealing
forging
thermal treatment
Opis:
Production processes of hot forging most often look similar [1-3]. Forging in several operations, usually in three or four. Most often the first operation is upsetting or flattening (sometimes rolling). The last operation is finishing forging. This applies to the production of steel forgings for the automotive, agricultural and other similar industries. Typical production proceeds as follows: the forgings are cleaned (shot-blasted) and then heat treatment is performed. It can be normalization, hardening and tempering, etc. After the heat treatment, forgings are checked and subjected to strength and microscopic tests, hardness tests, impact tests. The type of tests depends on the recipient. The process described in the work takes place in three operations. The heat treatment used so far is hardening and tempering. An attempt was made to change the heat treatment technology for a selected product made of 42CrMo4 steel (1.7225) (4140). An isothermal annealing test was carried out at different temperatures and for different times. The possibility of using heat from the forging process in heat treatment processes for the described product has been confirmed.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 951-958
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neuro-fuzzy modelling based on a deterministic annealing approach
Autorzy:
Czabański, R.
Powiązania:
https://bibliotekanauki.pl/articles/908442.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
system rozmyty
sieć neuronowa
ekstrakcja reguł
fuzzy systems
neural networks
neuro-fuzzy systems
rules extraction
deterministic annealing
prediction
Opis:
This paper introduces a new learning algorithm for artificial neural networks, based on a fuzzy inference system ANBLIR. It is a computationally effective neuro-fuzzy system with parametrized fuzzy sets in the consequent parts of fuzzy if-then rules, which uses a conjunctive as well as a logical interpretation of those rules. In the original approach, the estimation of unknown system parameters was made by means of a combination of both gradient and least-squares methods. The novelty of the learning algorithm consists in the application of a deterministic annealing optimization method. It leads to an improvement in the neuro-fuzzy modelling performance. To show the validity of the introduced method, two examples of application concerning chaotic time series prediction and system identification problems are provided.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2005, 15, 4; 561-576
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 281

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