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1
Content available A Novel Method for Optimizing Parameters influencing the Bearing Capacity of Geosynthetic Reinforced Sand Using RSM, ANN, and Multiobjective Genetic Algorithm
Lafifi Brahim, Rouaiguia Ammar, Soltani El Alia
Studia Geotechnica et Mechanica
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2023
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Vol. 45, nr 2
174--196
EN
In this study, a novel method is proposed to optimize the reinforced parameters influencing the bearing capacity of a shallow square foundation resting on sandy soil reinforced with geosynthetic. The parameters to be optimized are reinforcement length (L), the number of reinforcement layers (N), the depth of the topmost layer of geosynthetic (U), and the vertical distance between two reinforcement layers (X). To achieve this objective, 25 laboratory small-scale model tests were conducted on reinforced sand. This laboratory-scale model has used two geosynthetics as reinforcement materials and one sandy soil. Firstly, the effect of reinforcement parameters on the bearing load was investigated using the analysis of variance (ANOVA). Both response surface methodology (RSM) and artificial neural networks (ANN) tools were applied and compared to model bearing capacity. Finally, the multiobjective genetic algorithm (MOGA) coupled with RSM and ANN models was used to solve multi objective optimization problems. The design of bearing capacity is considered a multi-objective optimization problem. In this regard, the two conflicting objectives are the need to maximize bearing capacity and minimize the cost. According to the obtained results, an informed decision regarding the design of the bearing capacity of reinforced sand is reached.
2
Content available Odporny system sterowania ruchem drogowym bazujący na optymalizacji wielokryterialnej
Cieślewicz Dobrosław
Pomiary Automatyka Robotyka
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2020
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R. 24, nr 4
11--18
PL
Model matematyczny jest uproszczonym odwzorowaniem pewnych zjawisk, które uwzględnia jedynie cechy istotne. W dzisiejszych czasach coraz większym problemem stają się przeciążone infrastruktury drogowe, szczególnie w większych ośrodkach miejskich. Problem ten można w pewnym stopniu zredukować, stosując zaawansowane algorytmy sterowania. W niniejszym artykule podjęto próbę sterowania przepływem ruchu drogowego w skali makroskopowej. W tym celu użyto adaptacji dyskretnego, nieliniowego modelu matematycznego. Przy wykorzystaniu środowiska programistycznego MATLAB opracowano i zoptymalizowano układ sterowania niewielką siecią komunikacyjną. Następnie, zakładając przykładowy scenariusz, przeprowadzono dla tej sieci badania symulacyjne.
EN
The mathematical model is a simplified representation of certain phenomena, which takes into account only the essential features. Nowadays, congested road infrastructures are becoming a growing problem, especially in larger urban centres. This problem can be somewhat reduced by using advanced control algorithms. This article attempts to control the traffic flow on a macroscopic scale. For this purpose, a discrete, nonlinear mathematical model was adopted. Using the MATLAB programming environment, a control system for a small communication network was developed and optimised. Then, assuming a sample scenario, simulation studies were conducted for this network.
3
Content available Evolutionary multi-agent system with crowding factor and mass center mechanisms for multiobjective optimisation
Różański Mateusz, Siwik Leszek
Computer Science
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2019
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Vol. 20 (3)
343--367
EN
This work presents some additional mechanisms for Evolutionary Multi-Agent Systems for Multiobjective Optimisation trying to solve problems with population stagnation and loss of diversity. Those mechanisms reward solutions located in a less crowded neighborhood and on edges of the frontier. Both techniques have been described and also some preliminary results have been shown.
4
Content available Metoda rozmieszczania urządzeń pomiarowych i wykonawczych do celu diagnozowania wycieków w sieciach wodociągowych
Przystałka P., Wyczółkowski R.
Problemy Eksploatacji
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2011
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nr 2
141-151
PL
W artykule opisano metodę określania konfiguracji czujników przepływu oraz reduktorów ciśnienia, optymalnej ze względu na działanie systemu detekcji i lokalizacji wycieków pojawiających się w sieciach wodociągowych. Metoda optymalizacji w głównej mierze opiera się na algorytmie przeszukiwania systematycznego oraz algorytmie genetycznym. W obu przypadkach funkcję celu/przystosowania utworzono na bazie miar wrażliwościowych oraz z zastosowaniem ogólnej teorii optymalnego planowania eksperymentów. Przeprowadzone badania weryfikacyjne potwierdziły poprawność zaproponowanego rozwiązania oraz jego przydatność praktyczną.
EN
The paper deals with a method for configuring flow meter locations and reducing valve set-up points. These positions are optimal for acquiring information that is needed for fault detection and locating small leakage points in water distribution systems. The method is based on systematic search and genetic algorithms. For both approaches, the objective/fitness function was created with the use of sensitivity measures and optimal experimental design criterions. The verification of the delineated approach was conducted for a real-world water supply network. The achieved results confirmed the correctness of the proposed method.
5
Content available Application of multiobjective optimization tools in a thrust bearing pad modelling
Grądkowski P.
Postępy Nauki i Techniki
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2011
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nr 7
5-14
EN
To model an oil film of a fluid friction slide bearing, it usually requires solving a set of equations. Some part of these equations are partial differential equations. Thanks to application of numerical methods, it is possible to find an approximated solution. Most commonly, iterative methods implementing nested loops are suggested, where each loop provides solution for one parameter at fixed values of the remaining parameters. The paper presents an attempt to use mathematical optimisation terms in defining a problem of modelling of an oil film created in the face of a hydrostatic thrust bearing pad. Multiobjective optimisation tools have been applied. Some parameters of the oil film were treated as unknowns, while the others as the goal functions. One of the advantages of such approach may be reducing the number of iterations and speeding up the computing process.
PL
Modelowanie filmu olejowego ślizgowego łożyska tarcia płynnego wymaga najczęściej rozwiązania układu kilku równań, z czego część to równania różniczkowe cząstkowe. Dzięki zastosowaniu metod numerycznych możliwe jest znalezienie przybliżonego rozwiązania takiego układu. Najczęściej proponowane są metody iteracyjne z zagnieżdżonymi pętlami, z których każda określa rozwiązanie jednego równania przy ustalonych parametrach innych. W pracy przedstawiono próbę zdefiniowania zagadnienia modelowania filmu olejowego na powierzchni segmentu hydrostatycznego łożyska wzdłużnego pojęciami optymalizacji matematycznej. Zastosowano narzędzia optymalizacji wielokryterialnej. Część parametrów filmu olejowego potraktowano jako zmienne decyzyjne, inne natomiast jako funkcje celu. Korzyścią płynącą z takiego podejścia może być zmniejszenie liczby iteracji i przyspieszenie obliczeń.
6
Content available remote Ecological optimisation of materials technological processes
Nowosielski R., Kania A.
Journal of Achievements in Materials and Manufacturing Engineering
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2011
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Vol. 48, nr 2
192--199
EN
Purpose: In this paper the necessity of ecological optimisation of materials technological processes was presented. The Procedure of the Optimum Materials Technological Process (POMPT) with Poli-Opt version 1.0 program to optimisation of materials technological processes was discussed. Design/methodology/approach: In this article the essence of multicriterial optimisation was presented. The method of the polyoptimisation - genetic algorithms (GA) for the technological processes optimisation has been showed. Application of the POMPT procedure by general analysis and estimation for 4 zinc plating technological processes has been tested and illustrated. Findings: The characteristic of GA method, stages of the POMPT procedure with usage of the computer program to optimisation of the technological processes were discussed. Research limitations/implications: The presented POMPT procedure is not the closed solution but it is the object which should be subject to further testing and improvements in the range of the optimisation methodology usage and information technique. Practical implications: The proposed POMPT procedure of technically, ecologically and economically optimum materials technological process is the effective and relatively simple tool making possible the analysis and estimation of the technological processes and the optimisation of a group of the materials technological processes in the direction of improvement of the negative environmental influences. Originality/value: With regard to increasing quantity of possible technical solutions, the optimisation methods and the POMPT procedure should have more and more meaning in the materials engineering.
7
Content available remote Optimizsation of the lacquering process
Michalik K., Pusz A.
Archives of Materials Science and Engineering
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2008
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Vol. 32, nr 2
113-116
EN
Purpose: The topic of this research is estimation of coat parameters generate by paint robots. The purpose of this article is to present results of optimization of the varnishing process. Design/methodology/approach: After theoretical analysis of the methods of the optimization, in examinations was used multicriterial with method of the optimization. This method allows for diagnosing the problem of the lacquering process. Findings: Optimization of the process with multicriterial method let for selecting right parameters of the process of painting. The possibility of the optimum technological process choice was proposed. The optimization methods should have more and more meaning in the materials engineering. It is because of many possible technical problems to solutions. Research limitations/implications: The method of optimization such as multicriterial depend on degree of complexity of physical and technical relations of the analysed lacquering processes. Practical implications: The work is an example of analysis of chosen technological process in aspect of its efficiency. It could be helpful to improve a level of total productivity of technological processes by using multicriterial method. Originality/value: This paper is obtained original model for experimental domain of forming parameters and identification of parameters influence in that model.
8
Dual nature of mass multi-agent systems.
Dobrowolski G., Kisiel-Dorohinicki M., Nawarecki E.
Systems Science
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2001
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Vol. 27, nr 3
77-95
EN
Dual nature of mass multi-agent systems (mMAS) emerging as an internal discord of two spheres - micro (virtual) consisting of agents and their internal phenomena, and macro arising at the interface to the real world $stems the necessity of a new approach to analysis, design and utilisation of such systems. Based on the concept of VR decomposition, the problem of management of such systems is discussed. As a sub-type that makes mMAS closer to the application sphere, an evolutionary multi-agent system (EMAS) is proposed. EMAS combines features of mMAS with advantages of an evolutionary model of computation. As an illustration of this consideration two particular EMAS are presented, which allow us to obtain promising results in the fields of multiobjective optimisation and time-series prediction, and thus justify the approach.
9
Content available remote Logic Synthesis Method for Power Dissipation Reduction in Combinational Digital Circuits
Brzozowski I., Kos A.
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2001
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vol. 49, nr 4
581-594
EN
In the paper the authors summerise their works on power dissipation reducing in combinational digital VLSI circuits. The reduction is obtained thanks to proper logic synthesis which consists in the decrease of circuit switching activity and is a part of complex multiobjective optimisation. As a consequence, less complicated, smaller, more reliable and faster digital circuits can be designed. The proposed new synthesis method is illustrated with some examples. The benchmark is included.
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