Wszystkie pola: mathematical optimisation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Automatic shape optimisation of hydro turbine components based on CFD
Autorzy:: Eisinger, R.
Ruprecht, A.
Powiązania:: https://bibliotekanauki.pl/articles/1986746.pdf
Data publikacji:: 2002
Wydawca:: Politechnika Gdańska
Tematy:: mathematical optimisation
flow simulation
draft tube
Opis:: Since hydro turbines are designed individually according to the local situation, this requires a huge engineering effort. In order to reduce this effort, automatic optimisation tools are necessary. In this paper the shape optimisation of a turbine draft tube is shown. Different optimisation algorithms have been applied and will be discussed. From the used algorithms, the one based on approximated gradients seems to be the fastest.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 1; 101-111
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

Tytuł:: Analysis of friction interaction and optimisation of detail surface hardening technologies using non-local mathematical models
Autorzy:: Lyashenko, B. A.
Stotsko, Z. A.
Kuzin, O. A.
Kuzin, M. O.
Mechnik, V. A.
Powiązania:: https://bibliotekanauki.pl/articles/366788.pdf
Data publikacji:: 2020
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: friction
surface engineering
non-local mathematical model
optimisation
tarcie
inżynieria powierzchni
model matematyczny
optymalizacja
Opis:: Purpose: The aim of the work is to build physically sound engineering and design schemes that take into account the behaviour of polycrystalline metal systems under intense loads and allow optimization of surface treatment technologies to increase the operational reliability parameters of products. Design/methodology/approach: Using the approaches of thermodynamics, a methodological scheme is proposed, on the basis of which it is possible to optimize surface engineering technologies to increase the contact durability of details. Findings: It was found that the maximum increase in the durability of steel 40X13 (AISI 420) is achieved with thermocyclic ion nitriding in a cycle of ± 50°C, and the minimum with isothermal nitriding. Research limitations/implications: In this paper, the optimization of technological solutions to increase the contact durability of structural elements operating under prevailing power loads is given. Practical implications: Using the proposed mathematical relationships, optimal technological regimes of ion-plasma nitriding were established for various operating conditions, under which the maximum durability and wear resistance of 40X13 (AISI 420) steel are ensured. Originality/value: The paper proposes an approach to the formation of functionally gradient surface layers of steel with specified operational parameters when choosing optimal nitriding technology modes based on nonlocal mathematical models.
Źródło:: Journal of Achievements in Materials and Manufacturing Engineering; 2020, 100, 1; 20-25
1734-8412
Pojawia się w:: Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Selected issues related to heat storage tank modelling and optimisation aimed at forecasting its operation
Autorzy:: Badyda, K.
Niewiński, G.
Bujalski, W.
Warchoł, M.
Powiązania:: https://bibliotekanauki.pl/articles/240413.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: akumulator ciepła
modelowanie matematyczne
optymalizacja
zbiornik ciepła
CHP
heat accumulator
heat storage tank
mathematical modelling
optimisation
Opis:: The paper presents results of research focused on modelling heat storage tank operation used for forecasting purposes. It presents selected issues related to mathematical modelling of heat storage tanks and related equipment and discusses solution process of the optimisation task. Presented detailed results were obtained during real-life industrial implementation of the optimisation process at the Siekierki combined heat and power (CHP) plant in Warsaw owned by Vattenfall Heat Poland S.A. (currently by Polish Oil & Gas Company - PGNiG SA) carried out by the Academic Research Centre of Power Industry and Environment Protection, Warsaw University of Technology in collaboration with Transition Technologies S.A. company.
Źródło:: Archives of Thermodynamics; 2011, 32, 3; 3-31
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Multi-criteria optimization of multi-step matrix game in collision avoidance of ships
Autorzy:: Lisowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/116609.pdf
Data publikacji:: 2019
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:: collision avoidance
matrix game
multicriteria optimisation
collision risk
safe trajectories
colregs
ARPA
mathematical model
Opis:: This research article formulates a mathematical model of the matrix game of the safe ship control process containing: state variables and control, collision risk definition and the form of a collision risk matrix. Multicriteria optimization of the matrix game was introduced, leading to non-cooperative and cooperative game control algorithms and non-game control. Simulation safe trajectories of own ship for various types of control were compared to the example of the real situation at sea.
Źródło:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 1; 125-131
2083-6473
2083-6481
Pojawia się w:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Analysis of power system stabilizer Pareto optimisation-when taking into account the uncertainty of power system mathematical model parameters
Autorzy:: Nocoń, A.
Paszek, S.
Powiązania:: https://bibliotekanauki.pl/articles/140408.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: stabilizator systemowy
niepewność parametrów
Pareto-optymalizacja
power system stabilizer
Pareto optimization
parameter uncertainty
Opis:: The paper presents analysis of optimisation results of power system stabilizer (PSS) parameters when taking into account the uncertainty of mathematical model parameters of the power system (PS) elements. The Pareto optimisation was used for optimisation of the system stabilizer parameters. Parameters of five stabilizers of PSS3B type were determined in optimisation process with use of a genetic algorithm with tournament selection. The results obtained were assessed from the point of view of selecting the criterion function. The analysis of influence of the parameter uncertainty on the quality of the results obtained was performed.
Źródło:: Archives of Electrical Engineering; 2011, 60, 4; 385-398
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Optimisation of Shallow Water Coefficients Based on Sea Trials Manoeuvring
Identyfikacja parametrów efektu płytkowodzia na podstawie prób morskich
Autorzy:: Artyszuk, J.
Powiązania:: https://bibliotekanauki.pl/articles/360181.pdf
Data publikacji:: 2004
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:: manewrowanie
model matematyczny
płytkowodzie
identyfikacja
EXPLO-SHIP 2004
manoeuvring
mathematical model
shallow water
identification
full-scale
Opis:: Restricted water effects upon ship manoeuvring are investigated from the full-scale based identification viewpoint. As the resistance increase may be quite accurately correlated with the squat, it is proposed to store in the ship manoeuvring model kernel only data on the ship's squat. The problem of correction factors (multipliers) to be imposed upon ship added masses and hull force coefficients is raised. Different patterns (combinations) of the multipliers are simulated to show the most representative ship behaviour with regard to turning and zigzag manoeuvres.
Przeanalizowano wpływ ograniczeń hydraulicznych akwenu na manewrowanie statkiem w aspekcie identyfikacji hydrodynamicznego modelu ruchu z prób morskich. W odniesieniu do modelowania wzrostu oporów zaleca się ich uzależnienie od aktualnego osiadania. Przeprowadzono symulację różnych konfiguracji współczynników korekcyjnych hydrodynamiki kadłuba na warunki płytkowodzia celem otrzymania charakterystycznych zachowań statku w próbach cyrkulacji i wężowej.
Źródło:: Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2004, 2 (74); 33-43
1733-8670
2392-0378
Pojawia się w:: Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Minimisation of public debt servicing costs based on nonlinear mathematical programming approach
Autorzy:: Klukowski, L.
Kuba, E.
Powiązania:: https://bibliotekanauki.pl/articles/206515.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:: minimisation of servicing costs of public debt
optimisation approach in public debt management
profitability minimisation of debt instruments sold at auctions
Opis:: The paper presents formulations of optimisation problems for minimisation of servicing cost of government debt instruments (T-bills and T-bonds) issued in Poland and examples of their applications. The first of these problems allows for determining the structure of T-bills with different maturities - from 1 to 52 weeks (sold at multiprice auction), which minimise their servicing cost. This cost (criterion function) is based on T-bills profitability determined by compound rate of return (CRR). The constraints of the task express: * minimum receipts to the State Budget, * maximal profitability, * average maturity, and * minimal and maximal amount for each type of bills. The generalisation of this problem for some series of (consecutive) auctions is also discussed. The second task makes it possible to determine optimal structure of T-bonds using a similar (but more complex) form of the criterion function and more extensive set of constraints. The problems presented are of discrete and non-linear form and in result - rather difficult to solve in real time (during the auction). Therefore, some continuos approximations of these problems based on polynomials determined with the use of least squares method are suggested. Such an approach makes it possible to obtain an optimal solution in several minutes using Excel spreadsheet (package solver) and PC computer. Examples of actual problems for T-bills and T-bonds, based on data for the year 2000 are presented, too. The application of optimisation methods resulted in (relative) gain measured by a criterion function equal to about 1% (annual costs of the domestic debt equals about [3 * 10^9] US$).
Źródło:: Control and Cybernetics; 2001, 30, 1; 99-114
0324-8569
Pojawia się w:: Control and Cybernetics
Dostawca treści:: Biblioteka Nauki

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