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Tytuł:
Energy losses in big band saw machines – analysis and optimization
Autorzy:
Marinov, Boycho
Powiązania:
https://bibliotekanauki.pl/articles/949943.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
band saw machine
kinetic energy losses
optimization procedure
optimization solution
Opis:
In this paper, the energy losses in big band saw machines are investigated. These losses are caused by the geometric and angular inaccuracies with which the leading wheels are made. Expressions for calculating the kinetic energy of the mechanical system in the ideal and the real cases are obtained. For this purpose, expressions for calculating the velocities of the centers of the masses in two mutually perpendicular planes are obtained. A dependence for calculation of the kinetic energy losses of the mechanical system in final form is received. Optimization procedure is used to determine the values of the parameters at which these losses have minimum values. The proposed study can be used to minimize energy losses in other classes of woodworking machines.
Źródło:
Archive of Mechanical Engineering; 2020, LXVII, 3; 335-351
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The verification of the estimation of transport and sorption parameters in the MATLAB environment. A column test
Autorzy:
Okońska, M.
Kaczmarek, M.
Małoszewski, P.
Marciniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/184718.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
column tests
sorption models
parameters
numerical solution
optimization
MATLAB
Opis:
Mathematical modelling of the migration of pollutants in the groundwater environment requires knowledge of the values of transport and sorption parameters. The aim of this study was 1) to determine the values of advection, dispersion and sorption parameters of selected tracers that are transported through a porous medium, and 2) to verify the applied parameters estimation procedure. The authors examined the migration of a solution containing conservative and reactive tracers (chloride, nitrate, lithium and ammonium ions) through a sample of medium sand. The soil sample for the column test was taken from an aquifer near the Tursko groundwater intake (Wielkopolska province, Poland). The parameter estimation procedure, conducted in the MATLAB environment, included the numerical solution of the differential equations of transport and sorption, and the application of the numerical optimization method. During the identification, the authors tested twelve mathematical models including the advection-dispersion model, as well as single and hybrid (i.e. two-site) sorption models. The authors made a comparison of parameter values obtained by means of the global and local optimization method. The fitting quality was assessed by calculating the root mean square error RMSE and correlation coefficient r. As a result of the research, the authors determined the values of the advection-dispersion parameters: hydraulic conductivity k, effective porosity n e, and longitudinal dispersivity α. The authors found out that the nature oflithium ions migration is best captured by the single sorption model (equilibrium sorption), whereas the nature of ammonium ions migration is by the hybrid model with irreversible sorption. Lithium ions on the tested soil revealed low sorption intensity, ammonium ions showed medium intensity, while nitrate ions were transported at the same rate as chloride ions, exhibiting no retardation. The verification of parameter estimation in the MATLAB environment was carried out by comparing it against the alternative, well-known and often tested method, based on analytical solutions of the transport and sorption equation, combined with optimization within the FIELD and KLUTE-STEP programmes.
Źródło:
Geology, Geophysics and Environment; 2017, 43, 3; 213-227
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving the intensification and diversification balance of the tabu solution for the Robust Capacitated International Sourcing problem (RoCIS)
Autorzy:
Huacuja, H. J. F.
González-Velarde, J. R.
Valdez, G. C.
Powiązania:
https://bibliotekanauki.pl/articles/385145.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
RoCis
heuristic approach
optimization
initial solution
tabu search
memory strategies
Opis:
This paper addresses the robust capacitated international sourcing problem (RoCIS), which consists of selecting a subset of suppliers with finite capacity, from an available set of potential suppliers internationally located. This problem was introduced by González-Velarde and Laguna in [1], where they propose a deterministic solution method based on tabu search memory strategies. The pro cess consists of three steps: build an initial solution, create a neighborhood of promising solutions and perform a local search in the neighborhood. In this work we propose improving the construction of the initial solution, the cons truction of the neighborhood, the local search, and the intensification and diversification balance. Experimental evidence shows that the improved tabu solution with diver sification outperforms the best solutions reported for six of the instances considered, increases by 18% the number of best solutions found and reduces by 44% the deviation of the best solution found, respect to the best algorithm reported.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2010, 4, 4; 64-73
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a multi-objective optimization problem arising from production theory
Autorzy:
Roman, Maria
Wieczorek, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1338896.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
multi-objective optimization
(weakly) efficient solution
household production
(weak) Pareto optimality
Opis:
The paper presents a natural application of multi-objective programming to household production and consumption theory. A contribution to multi-objective programming theory is also included.
Źródło:
Applicationes Mathematicae; 1998-1999, 25, 4; 411-415
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Necessary optimality conditions for robust nonsmooth multiobjective optimization problems
Autorzy:
Gadhi, Nazih Abderrazzak
Ohda, Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/2183482.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
convexificator
directional constraint qualification
efficient solution
optimality conditions
robust multiobjective optimization
Opis:
This paper deals with a robust multiobjective optimization problem involving nonsmooth/nonconvex real-valued functions. Under an appropriate constraint qualification, we establish necessary optimality conditions for weakly robust efficient solutions of the considered problem. These optimality conditions are presented in terms of Karush-Kuhn-Tucker multipliers and convexificators of the related functions. Examples illustrating our findings are also given.
Źródło:
Control and Cybernetics; 2022, 51, 3; 289--302
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optymalizacja konstrukcji pojemnościowego ogrzewacza wody
Optimization of a storage water heater construction
Autorzy:
Chamera, S.
Maciejewski, I.
Krzyżyński, T.
Powiązania:
https://bibliotekanauki.pl/articles/153778.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
optymalizacja
rozwiązanie Pareto-optymalne
energooszczędność
optimization
Pareto optimal solution
energy saving
Opis:
W artykule przedstawiono optymalizację elementów konstrukcji pojemnościowego ogrzewacza wody. Kryteria optymalizacji to minimalizacja zużycia energii oraz kosztów materiałowych elementów konstrukcyjnych ogrzewacza, decydujących o zużyciu energii. Rozwiązania Pareto-optymalne przedstawione są w postaci punktów, które decydują o wartościach pięciu zmiennych decyzyjnych. Przedstawiony algorytm optymalizacyjny może posłużyć do wspomagania konstruowania optymalnych w sensie kosztów wytworzenia i energooszczędności pojemnościowych urządzeń grzewczych.
The paper presents optimization of elements in a storage water heater construction. Two optimization criteria are taken into account: energy saving and minimum costs of materials, used in the construction of a water heater. The construction elements used in a heater have significant influence on the value of energy consumption. Basic construction elements of the storage water heater are shortly described. Fundamental physical and mechanical properties of selected materials used in a thermal insulation of the heaters are shown. The optimization task is delineated and an object of the optimization is also schematically presented. Additionally, the paper contains a mathematical model of the optimization and a range of decision variables. The Pareto-optimal solution points are calculated. These points decide on the values of five decision variables. When designing the storage water heater appliances, these optimization algorithms can be used to get the optimal material costs and energy saving. The paper is strictly focused on the cost of the materials used, not the cost of the heater manufacturing itself. Additional costs can be added by processing the considered material, for example polyurethane foam or by performing foamed polystyrene molders - properly to heater dimensions. The scale of additional costs surely depends on an output volume and technical capacities of a manufacturing plant - for example the size of machine park. Additional costs related to specific construction materials can be analyzed in other, individual consideration.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 11, 11; 1425-1427
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis, evaluation, and optimization of bio-medical thermo-resistive micro-calorimetric flow sensor using an analytical approach
Autorzy:
Babaelahi, Mojtaba
Sadri, Somayyeh
Powiązania:
https://bibliotekanauki.pl/articles/2051855.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermo-resistive
micro-calorimetric
sensor
temperature
variable conductivity
analytical solution
optimization
Opis:
Sensitive MEMS-based thermal flow sensors are the best choice for monitoring the patient’s respiration prompt diagnosis of breath disturbances. In this paper, open space micro-calorimetric flow sensors are investigated as precise monitoring tools. The differential energy balance equation, including convection and conduction terms, is derived for thermal analysis of the considered sensor. The temperature-dependent thermal conductivity of the thin silicon-oxide membrane layer is considered in the energy balance equation. The derived thermal non-linear differential equation is solved using a well-known analytical method, and a finite-element numerical solution is used for the confirmation. Results show that the presented analytical model offers a precise tool for evaluating these sensors. The effects of flow and thin membrane film parameters on thermo-resistive micro-calorimetric flow sensors’ performance and sensitivity are evaluated. The optimization has been performed at different flow velocities using a genetic algorithm method to determine the optimum configuration of the considered flow sensor. The geometrical parameters are selected as a decision variable in the optimization procedure. In the final step, using optimization results and curve-fitting, the expressions for the optimum decision variables have been derived. The sensor’s optimum configuration is achieved analytically based on flow velocity with the analytical terms for optimum decision variables.
Źródło:
Metrology and Measurement Systems; 2022, 29, 1; 109-125
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE METHOD OF SUPPORTING DECISIONS UNDER RISK BASED ON MULTIOBJECTIVE OPTIMIZATION
Autorzy:
Łodziński, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/453768.pdf
Data publikacji:
2013
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
multiobjective optimization
symmetrically efficient solution
scalarization function
supporting a decision-making process
Opis:
The method of supporting decisions under risk was presented in this paper. Making decision under risk takes place when a result of a given decision is not explicit and depends on the condition of the environment. A decision-making process based on multiobjective optimization has been presented in this paper. Methods of multiobjective optimization do not give one unique solution, but a whole set of them. A decision making relies on interactive conducting of the decision making process. Selection of given decision is made by way of solving a problem with parameters defining aspirations of a decision maker and the evaluation of obtained results. A decision maker defines a parameter, for which a solution is indicated. Then he or she evaluates the received solution by either accepting or rejecting it. In the second case a decision maker provides a new parameter value and a problem is solved again for the new parameter.39-50
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2013, 14, 2; 39-50
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Using the Multi-criteria Optimization to Support the Selection of Joint Decision within Comptetitive Environment
Autorzy:
Lodzinski, A.
Powiązania:
https://bibliotekanauki.pl/articles/384588.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
joint decision
multicriteria optimization
equitably efficient solution
scalarization function
joint decision making
Opis:
The paper presents the method of facilitating joint decision making in a competitive environment. We deal with a joint decision when the group of people with different preferences are to make one single decision. The joint decision selection process is modelled with the use of multi-criteria optimization task. It is solved with the use of reference point method. This method is an interactive method in which every person specifies its requirements in the form of a reference point, expressing the desired values for its evaluation function. On the basis of the provided reference point, a scalar achievement function is built. Maximization of this function generates a solution of the multi-criteria task. This solution is presented to every person for acceptance or as a basis for the modification of the reference point. The paper gives an example of applying the proposed decision making while competing by three persons of different preferences.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2015, 9, 2; 37-41
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advances in development of dedicated evolutionary algorithms for large non-linear constrained optimization problems
Autorzy:
Głowacki, M.
Orkisz, J.
Powiązania:
https://bibliotekanauki.pl/articles/31343110.pdf
Data publikacji:
2013
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
evolutionary algorithms
large non-linear constrained optimization
solution efficiency increase
algorytmy ewolucyjne
Opis:
Efficient optimization algorithms are of great importance in many scientific and engineering applications. This paper considers development of dedicated Evolutionary Algorithms (EA) based approach for solving large, non-linear, constrained optimization problems. The EA are precisely understood here as decimal-coded Genetic Algorithms consisting of three basic operators: selection, crossover and mutation, followed by several newly developed calculation speed-up techniques. Efficiency increase of the EA computations may be obtained in several ways, including simple concepts proposed here like: solution smoothing and balancing, a posteriori solution error analysis, non-standard use of distributed and parallel calculations, and step-by-step mesh refinement. Efficiency of the proposed techniques has been evaluated using several benchmark tests. These preliminary tests indicate significant speed-up of the large optimization processes involved. Considered are applications of the EA to the sample problem of residual stresses analysis in elastic-plastic bodies being under cyclic loadings, and to a wide class of problems resulting from the Physically Based Approximation (PBA) of experimental data.
Źródło:
IPPT Reports on Fundamental Technological Research; 2013, 4; 25-29
2299-3657
Pojawia się w:
IPPT Reports on Fundamental Technological Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algorytm inspirowany polem walki - połączenie algorytmów numerycznych z ideą roju
Autorzy:
Baumgart, Jan
Sangho, Belco
Powiązania:
https://bibliotekanauki.pl/articles/41206049.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Kazimierza Wielkiego w Bydgoszczy
Tematy:
algorytm optymalizacyjny
inspiracja polem walki
rozwiązanie
optymalizacja
rzeczywiste problemy optymalizacji
optymalizacja funkcji
algorytm numeryczny
optimization algorithms
battlefield inspired inspiration
solution
optimization
real optimization problems
function optimization
numerical algorithm
Opis:
Artykuł przedstawia przygotowany algorytm na bazie połączenia idei znanych metod numerycznych z metodami opartymi na idei roju. Algorytm został przygotowany z inspiracji polem walki podczas którego w równych odstępach żołnierze przeczesują siły wroga z różnymi prędkościami zależnie od posiadanego orężu a następnie ograniczają zakres pola bitwy. Zaproponowane rozwiązanie wywodzi się właśnie ze zbliżonych założeń. Głównym założeniem pracy było przedstawienie potencjalnego zysku z połączenia metod optymalizacji oraz porównanie metody mieszanej z metodami bazującymi na idei roju pod względem prędkości działania oraz skuteczności odnajdowania optimum globalnego.Algorytm został porównany z dwoma algorytmami metaheurystycznymi pod kątem dokładności odnalezionych rozwiązań oraz prędkości. Zgodnie z wynikami eksperymentów posiada wydajność podobną w porównaniu z innymi algorytmami oraz daje zadowalające efekty w wykorzystaniu.
he article presents prepared algorithm based on the combination of the ideas of known numericalmethods with methods based on the idea of a swarm. The algorithm was prepared inspired by the battlefield,during which, at equal intervals, soldiers scour enemy forces at different speeds depending on the weapon theyhave, and then limit the scope of the battlefield. The proposed solution is based on similar assumptions. Themain assumption of the work was to present the potential profit from the combination of optimization methodsand to compare the mixed method with methods based on the idea of a swarm in terms of operating speed andthe effectiveness of finding the global optimum. The algorithm was compared with two metaheuristic algorithmsin terms of the accuracy of the solutions found and speed. According to the results of the experiments, it hasa similar performance compared to other algorithms and gives satisfactory results in use.
Źródło:
Studia i Materiały Informatyki Stosowanej; 2021, 2; 26-31
1689-6300
Pojawia się w:
Studia i Materiały Informatyki Stosowanej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Repulsive self - adaptive acceleration particle swarm optimization approach
Autorzy:
Ludwig, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/91874.pdf
Data publikacji:
2014
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
adaptive Particle Swarm Optimization
adaptive PSO
optimization
Repulsive Self-adaptive Acceleration PSO
RSAPSO
velocity weights
optimal solution of the problem
function evaluations
Opis:
Adaptive Particle Swarm Optimization (PSO) variants have become popular in recent years. The main idea of these adaptive PSO variants is that they adaptively change their search behavior during the optimization process based on information gathered during the run. Adaptive PSO variants have shown to be able to solve a wide range of difficult optimization problems efficiently and effectively. In this paper we propose a Repulsive Self-adaptive Acceleration PSO (RSAPSO) variant that adaptively optimizes the velocity weights of every particle at every iteration. The velocity weights include the acceleration constants as well as the inertia weight that are responsible for the balance between exploration and exploitation. Our proposed RSAPSO variant optimizes the velocity weights that are then used to search for the optimal solution of the problem (e.g., benchmark function). We compare RSAPSO to four known adaptive PSO variants (decreasing weight PSO, time-varying acceleration coefficients PSO, guaranteed convergence PSO, and attractive and repulsive PSO) on twenty benchmark problems. The results show that RSAPSO achives better results compared to the known PSO variants on difficult optimization problems that require large numbers of function evaluations.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2014, 4, 3; 189-204
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Support of Decision-Making under Risk by a Risk-Averse Decision-Maker
Autorzy:
Łodziński, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/375923.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
decision-making under risk
multi-criteria optimization
equitably efficient solution
scalarizing function
decision support system
Opis:
The paper presents a method of supporting decision-making under risk by a risk- -averse decision-maker. Decision-making under risk occurs when the outcome of the system is ambiguous and depends on the state of the environment. The problem is considered as a multi-criteria optimization. The decision support method consists of interactive conduct of the process of decision-making. The decision is made by means of solving a problem with controlling parameters, which determine the aspirations of the decision-maker and evaluating the obtained solutions. The decision-maker sets parameters for which a solution is determined. Subsequently, he or she assesses the obtained solution, accepting or rejecting it. In the latter case, the decision-maker sets new values for the parameters and the problem is solved again. The present paper presents a discrete example of support for decision making under risk.
Źródło:
Decision Making in Manufacturing and Services; 2019, 13, 1-2; 73-83
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-Criteria Optimization Approach to Modeling Negotiation Process
Autorzy:
Łodziński, A.
Powiązania:
https://bibliotekanauki.pl/articles/375876.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
negotiation process
multi-criteria optimization
equitably efficient decision
achievement function
set of negotiations
method for solution selection
Opis:
This paper presents a multi-criteria optimization approach for modeling the negotiation process. The negotiation process is modeled as a special multi-criteria problem. The method of finding solutions involves a process of the interactive selection of certain proposals. The parties submit proposals concerning the subjects of the negotiations; these proposals constitute the parameters of the multi-criteria optimization problem. Selecting the solutions is accomplished by solving the optimization problem using the parameters that define the aspirations of each party to the negotiations. Finally, the solutions reached by the parties are evaluated.
Źródło:
Decision Making in Manufacturing and Services; 2018, 12, 1-2; 33-44
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exact controllability of a string to rest with a moving boundary
Autorzy:
Gugat, Martin
Powiązania:
https://bibliotekanauki.pl/articles/970107.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
pde constrained optimization
optimal control of pdes
optimal boundary control
wave equation
analytic solution
exact controllability
moving boundaries
mining elevator
Opis:
We consider the problem of steering a finite string to the zero state in finite time from a given initial state by controlling the state at one boundary point while the other boundary point moves. As a possible application we have in mind the optimal control of a mining elevator, where the length of the string changes during the transportation process. During the transportation process, oscillations of the elevator-cable can occur that can be damped in this way. We present an exact controllability result for Dirichlet boundary control at the fixed end of the string that states that there exist exact controls for which the oscillations vanish after finite time. For the result we assume that the movements are Lipschitz continuous with a Lipschitz constant, whose absolute value is smaller than the wave speed. In the result, we present the minimal time, for which exact controllability holds, this time depending on the movement of the boundary point. Our results are based upon travelling wave solutions. We present a representation of the set of successful controls that steer the system to rest after finite time as the solution set of two point-wise equalities. This allows for a transformation of the optimal control problem to a form where no partial differential equation appears. This representation enables interesting insights into the structure of the successful controls. For example, exact bang-bang controls can only exist if the initial state is a simple function and the initial velocity is zero.
Źródło:
Control and Cybernetics; 2019, 48, 1; 69-87
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
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