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Wyświetlanie 1-15 z 91
Tytuł:
Land Suitability Assessment for Wheat Production Using Analytical Hierarchy Process and Parametric Method in Babylon Province
Autorzy:
Mohammed, Rafal J.
Suliman, Abdulhalim A.
Powiązania:
https://bibliotekanauki.pl/articles/27323842.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
land evolution
soil salinity
wheat
soil properties
crop variety
Opis:
This study was carried out to show the extent to which the land is productive due to the effect that climatic changes and the increase in population growth are the reasons that led to an increase in the demand for food, especially in developing countries. Therefore, a scientific way must assess the land suitability for growing crops. This research aimed to provide an integrated approach to the process of analyzing the suitability of agricultural lands for crop growth. Wheat in the Nile region of Babylon Governorate, was studied using the analytical hierarchy model (AHP) and compared with the parametric method and the actual crop in the field, as twelve soil criteria were determined (electrical conductivity, soil interaction, cation exchange capacity, exchangeable sodium ratio, soil texture, lime, gypsum, organic carbon, drainage, soil depth, slope, flooding) and three criteria were added in the AHP method due to their importance in Iraqi soils, which are (total nitrogen, availability phosphorus, crop variety). The results were extracted and showed that all the results of the study using the parametric method within the very unsuitable class for cultivation, N2, 72.5%, with an area of 37,734.07 hectares, and the unsuitable class, N1, 27.5%, with an area of 14,312.92 hectares, either by using the method. According to the analytical hierarchy process and giving varying importance to the soil criteria above, it was found that 37.5% are very suitable S1 with an area of 19517.62 hectares, 42.5% suitable for agriculture S2 with an area of 22119.97 hectares, and 20% moderately suitable S3 with an area of 10409.4 hectares. These results were similar to the agricultural reality of the regions under study.
Źródło:
Journal of Ecological Engineering; 2023, 24, 7; 75--87
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie metody głównych składowych w kartach kontrolnych procesów wieloparametrowych
Application of Principal Components Method in Control Charts of Multi-Parameter Processes
Autorzy:
Volodarsky, Evgeniy T.
Kozyr, Oleh
Warsza, Zygmunt Lech
Powiązania:
https://bibliotekanauki.pl/articles/27312458.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
kontrola wieloparametrowego procesu technologicznego
karty kontrolne Shewharta
metoda głównych składowych
Shewhart control charts
principal components method
control of a multi-parametric technological process
Opis:
W artykule opisano metodę głównych składowych PC (ang. Principal Components) służącą do tworzenia kart kontrolnych dla wieloparametrowych procesów wytwórczych o skorelowanych parametrach. Ocenę skuteczności zastosowania tej metody przeprowadzono na symulowanych danych, zbliżonych do wyników pomiarów uzyskanych w sterowaniu rzeczywistym procesem technologicznym. W wyniku modelowania kontroli procesu n-parametrowego otrzymano potwierdzenie skuteczności tej metody. Praca ta kontynuuje cykl publikacji autorów o kartach stosowanych w metodach kontroli jakości produkcji.
The article describes in detail the method of constructing control charts based on principal components. Evaluation of the effectiveness of the application of the method is carried out on simulated data, which are close to the measurement results obtained during the control of a real technological process. The results show that the proposed method is effective for controlling a multi-parameter technological process in the presence of a correlated parameters.
Źródło:
Pomiary Automatyka Robotyka; 2023, 27, 3; 65--71
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An algorithm for quadratically constrained multi-objective quadratic fractional programming with pentagonal fuzzy numbers
Autorzy:
Goyal, Vandana
Rani, Namrata
Gupta, Deepak
Powiązania:
https://bibliotekanauki.pl/articles/2175831.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
multi-objective quadratic fractional programming model
MOQFPM
pentagonal fuzzy number
PFN
mean method of α-cut
parametric approach
ε-constraint method
Opis:
This study proposes a methodology to obtain an efficient solution for a programming model which is multi-objective quadratic fractional with pentagonal fuzzy numbers as coefficients in all the objective functions and constraints. The proposed approach consists of three stages. In the first stage, defuzzification of the coefficients is carried out using the mean method of α-cut. Then, in the second stage, a crisp multi-objective quadratic fractional programming model (MOQFP) is constructed to obtain a non-fractional model based on an iterative parametric approach. In the final stage, this multi- -objective non-fractional model is transformed to obtain a model with a single objective by applying the ε-constraint method. This final model is then solved to get desired solution. Also, an algorithm and flowchart expressing the methodology are given to present a clear picture of the approach. Finally, a numerical example illustrating the complete approach is given.
Źródło:
Operations Research and Decisions; 2022, 32, 1; 49--71
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Data Envelopment Analysis in Performance Auditing - Measurement of Efficiency
Autorzy:
Karliński, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/2153750.pdf
Data publikacji:
2022-08
Wydawca:
Najwyższa Izba Kontroli
Tematy:
performance auditing
performance measurement
non-parametric methods
benchmarking
DEA
data envelope method
Opis:
One of the objectives of performance auditing is to examine and assess the efficiency of the audited processes, programmes and organisations. To this end, the ratio method is usually used (the relation between output and input). However, it is faulty and has several significant limitations. Simultaneously, more advanced analytical methods are often considered as too complicated. The author, apart from discussing the basic issues, including the definition of efficiency, focuses on the application of the so called non-parametric methods for assessing efficiency, especially the Data Envelopment Analysis (DEA) method. This method is known in academic circles, but it is also frequently applied in evaluation and benchmarking in business and in the public sector, and is recommended by various institutions and government agencies in many countries. Although the DEA is used by some audit institutions, it still seems to be not very common in auditing. In his article the author presents, in the most accessible manner possible, the idea of the DEA method, simple tools for its application and case studies.
Źródło:
Kontrola Państwowa; 2022, 67, 4 (405); 46-66
0452-5027
Pojawia się w:
Kontrola Państwowa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metoda obwiedni danych (DEA) w kontroli wykonania zadań - pomiar wydajności
Data Envelopment Analysis in Performance Auditing – Measurement of Efficiency
Autorzy:
Karliński, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/2153752.pdf
Data publikacji:
2022-08
Wydawca:
Najwyższa Izba Kontroli
Tematy:
kontrola wykonania zadań
pomiar wydajności
metody nieparametryczne
benchmarking
DEA
metoda obwiedni danych
performance auditing
performance measurement
non-parametric methods
data envelope method
Opis:
Jednym z celów kontroli wykonania zadań jest badanie i ocena wydajności procesów, programów i organizacji. Stosowana zwykle w tym celu metoda wskaźnikowa (relacja wyników do nakładów) ma jednak wiele istotnych wad i ograniczeń. Z kolei bardziej zaawansowane metody analityczne są często uznawane za zbyt skomplikowane. Autor, poza omówieniem podstawowych kwestii, w tym dotyczących definicji wydajności, skupia się na zastosowaniu do badania wydajności tzw. metod nieparametrycznych, a w szczególności analizy obwiedni danych (DEA). Metoda jest znana od lat w środowisku akademickim, ale wykorzystuje się ją często również do ewaluacji i benchmarkingu w biznesie oraz w sektorze publicznym. Jakkolwiek DEA jest stosowana przez niektóre instytucje audytorskie, nadal wydaje się być zbyt mało popularna w audycie i kontroli. W artykule przedstawiono istotę metody DEA, proste narzędzia służące do jej realizacji oraz przykładowe zastosowanie.
One of the objectives of performance auditing is to examine and assess the efficiency of the audited processes, programmes and organisations. To this end, the ratio method is usually used (the relation between output and input). However, it is faulty and has several significant limitations. Simultaneously, more advanced analytical methods are often considered as too complicated. The author, apart from discussing the basic issues, including the definition of efficiency, focuses on the application of the so called non-parametric methods for assessing efficiency, especially the Data Envelopment Analysis (DEA) method. This method is known in academic circles, but it is also frequently applied in evaluation and benchmarking in business and in the public sector, and is recommended by various institutions and government agencies in many countries. Although the DEA is used by some audit institutions, it still seems to be not very common in auditing. In his article the author presents, in the most accessible manner possible, the idea of the DEA method, simple tools for its application and case studies.
Źródło:
Kontrola Państwowa; 2022, 67, 4 (405); 24-45
0452-5027
Pojawia się w:
Kontrola Państwowa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric study of the earth dams behaviour subjected to earthquake
Autorzy:
Ayeche, H.
Zitouni, Z.
Limam, A.
Bouafia, A.
Powiązania:
https://bibliotekanauki.pl/articles/2172886.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
earth dam
earthquake
slope stability
block method
Sarma method
Opis:
Static stability of an earth dam can be established by estimating the static safety factor equal to the ratio of the shear strength to the shear stress along a critical sliding area. In contrast, it is more complicated to evaluate the dynamic stability during an earthquake. The water filling the interstices of the earth dams cannot drain during the short duration of an earthquake. An excess pore water pressure DU develops, and its role is predominant in the destabilisation of the dam. The pore water increase causes a decrease in the soil shear strength. It is, therefore, crucial to evaluate and take into consideration DU in the dam dynamic stability analysis. This research is a contribution to reach this objective. A parametric study was conducted by varying the physical and mechanical soil characteristics constituting the dam, as well as its geometrical values, in order to evaluate their effects on the dynamic safety factor. The dynamic safety factor is calculated using the pseudo-static method, taking into account the excess pore water pressure that develops during cyclic loading into the granular soil of the earth dam upstream face. The results of the parametrical analytical study were also compared to the results of numerical simulations of the dam seismic stability trough pseudo-static method. The numerical simulations were done with three different software: PLAXIS and ABAQUS (based on the finite element method) and GEOSTAB (deals with the problem at the limit equilibrium using the simplified Bishop method). At the end, on one hand, we were able to describe how and at what level of the dam upstream face the sliding occurs, and on the other hand, we were able to underline the adequate combination between the dam geometric parameters and the mechanical soil characteristics which may ensure seismic stability.
Źródło:
Studia Geotechnica et Mechanica; 2022, 44, 4; 267--281
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and parametric optimization of friction stir welding of aluminium alloy AA7068-T6 using response surface methodology and desirability function analysis
Autorzy:
Bindu, M. D.
Tide, P. S.
Bhasi, A. B.
Ramachandran, K. K.
Powiązania:
https://bibliotekanauki.pl/articles/2086852.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AA7068-T6
friction stir welding
response surface method
desirability function
zgrzewanie tarciowe z mieszaniem
metoda powierzchni odpowiedzi
funkcja spełnienia wymagań
Opis:
In this investigation, high specific strength precipitation hardenable alloy AA7068-T6 was joined using friction stir welding. Experiments were carried out using the three factor-three level central composite face-centered design of response surface methodology. Regression models were developed to assess the influence of tool rotational speed, welding speed, and axial force on ultimate tensile strength and elongation of the fabricated joints. The validity of the developed models was tested using the analysis of variance (ANOVA), actual and adjusted values of the regression coefficients, and experimental trials. The analysis of the developed models together with microstructural studies of typical cases showed that the tool rotational speed and welding speed have a significant interaction effect on the tensile strength and elongation of the joints. However, the axial force has a relatively low interaction effect with tool rotational speed and welding speed on the strength and elongation of the joints. The process variables were optimized using the desirability function analysis. The optimized values of joint tensile strength and elongation – 516 MPa and 21.57%, respectively were obtained at a tool rotational speed of 1218 rpm, welding speed of 47 mm/ min, and an axial force of 5.3 kN.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137936, 1--9
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The KhAI-90 Light Civil Turboprop Airplane Pilot Project
Projekt pilotażowy lekkiego cywilnego samolotu turbopropowego KhAI-90
Autorzy:
Grebenikov, Oleksandr
Loginov, Vasyl
Humennyi, Andrii
Buival, Liliia
Chumak, Anton
Powiązania:
https://bibliotekanauki.pl/articles/36447778.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
pilot project
aircraft design
light civil airplane
method
take-off weight
three-dimensional parametric modelling
projekt pilotażowy
projektowanie samolotów
lekki samolot cywilny
metoda
masa startowa
trójwymiarowe modelowanie parametryczne
Opis:
The pilot project of new light civil turboprop aircraft, called the KhAI-90, featuring a cruising speed of 350km/h, payload of 600 kg at 500 km range, and equipped with two turboprop Rolls-Royce 250-B17F engines each with power of 420 hp (alternatively, two AI-450C engines each with power of 450 hp may be installed) is presented herein. Based on the developed technical task, the concept for creating the KhAI-90 new competitive light civil aircraft, and the analysis of prototypes’ aircraft parameters and characteristics, the main tactical and technical requirements are assigned. The take-off weight of the new aircraft is determined in three approximations at the preliminary design stage of light civil turboprop aircraft, using the iterative software “CLA-TOW”, studying the influence of the wing geometric parameters and lift devices on aerodynamic performance, the power-to-weight ratio and the airplane weight parameters. The following parameters are calculated for the design: minimum takeoff weight WTO min = 3,600 kg, optimal wing loading p0 opt = 130 daN/m2, optimal aspect ratio 9.6, taper ratio 2.25, sweep angle at leading edge 3 degrees, airfoil relative thickness 10.6%. A general view and three-dimensional parametric models of the master-geometry and passenger cabin space distribution are constructed for the KhAI-90 by means of the SIEMENS NX computer integrated system. More broadly, this pilot project has also demonstrated the viability of the method we developed and previously reported for determining light civil turboprop airplane parameters.
Przedstawiono projekt pilotażowy nowego lekkiego cywilnego samolotu turbośmigłowego o nazwie KhAI-90, charakteryzującego się prędkością przelotową 350 km/h i ładownością 600 przy zasięgu 500 km, wyposażonego w dwa silniki turbośmigłowe Rolls-Royce 250-B17F, każdy o mocy 420 KM (alternatywnie w dwa silniki AI-450C, każdy o mocy 450 KM). Na podstawie ustalonego zadania technicznego, koncepcji stworzenia nowego wyczynowego lekkiego samolotu cywilnego KhAI-90 oraz analizy parametrów i charakterystyk prototypów samolotu określono główne wymagania taktyczno-techniczne. Masa startowa nowego samolotu określono w trzech przybliżeniach na etapie wstępnego projektowania lekkiego samolotu przy użyciu iteracyjnego oprogramowania „CLA-TOW” (analizując wpływ parametrów geometrycznych skrzydła i urządzeń nośnych na osiągi aerodynamiczne, stosunek mocy do masy i parametry masy samolotu). Obliczono następujące parametry projektu: minimalna masa startowa WTO min = 3600 kg, optymalne obciążenie skrzydła p0 opt = 130 daN/m2, optymalny współczynnik kształtu 9,6, współczynnik zbieżności 2,25, kąt natarcia na krawędzi natarcia 3 stopnie, grubość względna profilu 10,6%. Przedstawiono ogólny widok oraz trójwymiarowe modele parametryczne geometrii głównej i rozkładu przestrzeni kabiny pasażerskiej wygenerowane dla KhAI-90 za pomocą zintegrowanego systemu komputerowego SIEMENS NX. Niniejszy projekt pilotażowy wykazał również przydatność wcześniej opracowanej przez autorów metody określania parametrów lekkich cywilnych samolotów turbośmigłowych.
Źródło:
Transactions on Aerospace Research; 2021, 4 (265); 21-40
0509-6669
2545-2835
Pojawia się w:
Transactions on Aerospace Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Atypical application of the parametric method for track infrastructure inventory
Autorzy:
Czaplewski, Krzysztof
Specht, Cezary
Koc, Władysław
Wilk, Andrzej
Karwowski, Krzysztof
Dąbrowski, Paweł
Specht, Mariusz
Chrostowski, Piotr
Szmaglinski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/906041.pdf
Data publikacji:
2020
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
inland navigation
alignment methods
navigation infrastructure
navigation
tracks
data analysis
Opis:
For many years, satellite systems have seen widespread use in a variety of technical applications, as well as in operations related to setting-out and the exploitation of track infrastructure. Their main applications include an inventory of the trackage course and detecting changes in its position. In both of these tasks, the most important element that determines the quality of an analyses is the high accuracy of the determinations being carried out. Satellite surveying techniques are not always sufficiently accurate, and in such cases, it is necessary to employ other land surveying methods to process surveying data. This article presents the authors’ considerations with regards to the possibility of applying one of the most common land surveying adjustment methods, the parametric method, to operations related to an inventory of tram infrastructure in Gdańsk. The results are based on surveys carried out during a surveying campaign in the autumn of 2018. The considerations presented in the article concern a small part of the research conducted under project No. POIR.04.01.01-00-0017/17 entitled “Development of an innovative method for determining the precise trajectory of a railborne vehicle” which is being implemented by a consortium of Gdansk University of Technology and Gdynia Maritime University
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 61 (133); 31-38
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eksperymenty budownictwa i architektury. Ku metodzie naukowej w sztuce budowania
Experiments in architecture and civil engineering. Towards a scientific method in the art of building
Autorzy:
Słyk, Jan
Powiązania:
https://bibliotekanauki.pl/articles/128862.pdf
Data publikacji:
2020
Wydawca:
PWB MEDIA Zdziebłowski
Tematy:
model architektoniczny
metodyka projektowania
eksperyment
CAD
rewolucja informacyjna
model parametryczny
architectural model
design methodology
experiment
information revolution
parametric model
Opis:
Architektura i budownictwo długo pozostawały poza obszarem ścisłej, naukowej analizy. Teoria dyscypliny rozwijała się przede wszystkim w obszarze historii oraz krytyki. Metodykę projektowania kształtowano na bazie praktycznych doświadczeń: obserwacji, śledzenia procesów użytkowych, sukcesów konstrukcyjnych i katastrof. Ewolucja technik architektonicznych wiąże się ściśle z rozwojem konstruowanych modeli. Dzięki nim sztuka kształtowania przestrzeni zyskała szansę prowadzenia badań empirycznych. Początkowo modele odzwierciedlały wąski wycinek rzeczywistości, głównie jej formę geometryczną. Wraz z rozwojem nauk przyrodniczych stawały się w coraz większym stopniu reprezentatywne. W artykule przedstawiono główne etapy rozwoju modeli architektoniczno- budowlanych. Na tym tle zarysowano zmiany w metodyce prowadzące ku coraz ściślejszym formom rozumowania. Dokładnie przeanalizowano znaczenie cyfryzacji warsztatu dla poprawy jakości modeli. Ten ostatni etap ewolucji zinterpretowano w świetle funkcji cyfrowego medium, nowego elastycznego nośnika informacji o budynku.
Architecture and civil engineering have long remained outside the scope of strict, scientific analysis. The theory of discipline developed primarily in the area of history and criticism. The design methodology was established on the base of practical experience: observation, tracking processes of use, construction successes and disasters. The evolution of architectural techniques is closely related to the development of constructed models. Thanks to them, the art of shaping space gained a chance to conduct empirical research. Initially, models reflected a narrow scope of reality, mainly its geometric form. With the development of natural sciences, models became increasingly representative. The paper presents the timeline of development of architectural and engineering models. On that ground, changes in methodology have been outlined, leading to strict forms of reasoning. The significance of workshop digitization for improving the quality of models was thoroughly analyzed. This last stage of evolution has been interpreted considering the function of the digital medium, a new flexible form of information about the building.
Źródło:
Builder; 2020, 24, 8; 9-13
1896-0642
Pojawia się w:
Builder
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flow descriptors for parametric hydrographs accounting for afforestation of the catchment
Autorzy:
Baziak, Beata
Gądek, Wiesław
Bodziony, Marek
Tokarczyk, Tamara
Powiązania:
https://bibliotekanauki.pl/articles/108574.pdf
Data publikacji:
2020
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
physical catchment descriptors
gamma density function
parametric flow hydrograph
Archer method
skewness coefficient
hydrograph width
Opis:
Parametric flow hydrographs are used for design and management purposes in such fields as water management and aquatic engineering. They describe a theoretical hydrograph based on such parameters as maximum flow, time to peak, and surge duration. They are used to forecast flood risk and to evaluate the impact of land use on the run-off hydrograph. In Western Europe for many years methods have been used in which parametric hydrographs are determined based on physical catchment descriptors (PCDs), which are divided into three groups describing the physical features of a catchment. These descriptors are used to derive formulae enabling the determination of parametric flow hydrographs for any computational crosssection. In this work, such formulae are derived for the catchment of the Raba River, using the principles of design hydrology applied in Western European countries. The parametric hydrograph is described using Baptista’s gamma density function. The input hydrograph was a nonparametric flow hydrograph determined by Archer’s method. For nine gauging stations located in the Raba catchment, physical catchment descriptors were obtained for two 30-year periods: 1961-1990 and 1983-2012. Based on the nonparametric flow hydrograph and the PCDs, two groups of formulae were derived to describe the parametric hydrograph. Analysis of agreement between the computed parametric flow hydrographs and the input hydrograph indicated a high quality of fit. It should be noted that the formulae and analysis presented here refer only to the Raba catchment. However, the results confirm the possibility of applying these methods to the determination of parametric flow hydrographs for any river cross-section.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2020, 8, 1; 36-45
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Goal programming approach for solving heptagonal fuzzy transportation problem under budgetry constraint
Autorzy:
Khalifa, Hamiden Abd El-Wahed
Powiązania:
https://bibliotekanauki.pl/articles/406587.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
transportation problem
heptagonal fuzzy numbers
ranking method
goal programming
parametric study
Opis:
Transportation problem (TP) is a special type of linear programming problem (LPP) where the objective is to minimize the cost of distributing a product from several sources (or origins) to some destinations. This paper addresses a transportation problem in which the costs, supplies, and demands are represented as heptagonal fuzzy numbers. After converting the problem into the corresponding crisp TP using the ranking method, a goal programming (GP) approach is applied for obtaining the optimal solution. The advantage of GP for the decision-maker is easy to explain and implement in real life transportation. The stability set of the first kind corresponding to the optimal solution is determined. A numerical example is given to highlight the solution approach.
Źródło:
Operations Research and Decisions; 2020, 30, 1; 85-96
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Liquid vibrations in cylindrical tanks with and without baffles under lateral and longitudinal excitations
Autorzy:
Strelnikova, E.
Kriutchenko, D.
Gnitko, V.
Tonkonozhenko, A.
Powiązania:
https://bibliotekanauki.pl/articles/1839815.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
zbiornik cylindryczny
drgania swobodne
rezonans parametryczny
sloshing
cylindrical tank
baffle
free vibrations
forced vibrations
parametric resonance
boundary element method
Ince-Strutt diagram
Opis:
The paper is devoted to issues of estimating free surface elevations in rigid cylindrical fluid-filled tanks dunder external loadings. The possibility of baffles installation is provided. The liquid vibrations caused by lateral and longitudinal harmonic loadings are under consideration. Free, forced and parametrical vibrations are examined. Modes of the free liquid vibrations are considered as basic functions for the analysis of forced and parametric vibrations. The modes of the free liquid vibrations in baffled and un-baffled cylindrical tanks are received by using single-domain and multi-domain boundary element methods. Effects of baffle installation are studied. The problems of forced vibrations are reduced to solving the systems of second order ordinary differential equations. For parametric vibrations the system of Mathieu equations is obtained. The numerical simulation of free surface elevations at different loadings and baffle configurations is accomplished. Beat phenomena effects are considered under lateral harmonic excitations. The phenomenon of parametric resonance is examined under longitudinal harmonic excitations.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 117-132
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric method applicable in assessing breakout force and time for lifting slender bodies from seabed
Autorzy:
Michalski, Jan P.
Powiązania:
https://bibliotekanauki.pl/articles/258500.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
lifting objects from the seabed
breakout force
force needed to extricate the object from the seabed
Opis:
The article presents a parametric method applicable in assessing the suction force of a slender body to the seabed, and prognosing the body extrication time. Along with the body weight in water, the information on the suction force is essential for assessing the force needed to lift the object from the seabed. Based on the Foda theory and the resulting integral equation, which relates the maximum suction force with basic parameters of the issue of concern, the parametric method has been developed which can be widely applied in engineering practice of lifting objects. A set of discrete values of parameters selected from the range of typical values for engineering practice was the basis for developing algebraic formulas approximating the integral Foda equation for slender bodies. The included results of tests present the variability of suction force characteristics and the envelopes of maximum forces needed to extricate the body from the seabed.
Źródło:
Polish Maritime Research; 2020, 2; 69-75
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Searching for optimal prestressing of steel bar structures based on sensitivity analysis
Autorzy:
Yurchenko, V. V.
Peleshko, I. D.
Powiązania:
https://bibliotekanauki.pl/articles/230774.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optymalizacja parametryczna
element zbędny
siła sprężająca początkowa
sprężenie optymalne
analiza wrażliwości
metoda rzutowania gradientowego
parametric optimization
redundant member
initial prestressing force
optimal prestressing
sensitivity analysis
gradient projection method
Opis:
The paper considers parametric optimization problems for the steel bar structures formulated as nonlinear programming ones with variable unknown cross-sectional sizes of the structural members, as well as initial prestressing forces introduced into the specified redundant members of the structure. The system of constraints covers load-bearing capacity constraints for all the design sections of the structural members subjected to all the design load combinations at ultimate limit state, as well as displacement constraints for the specified nodes of the bar system, subjected to all design load combinations at serviceability limit state. The method of the objective function gradient projection onto the active constraints surface with simultaneous correction of the constraints violations has been used to solve the parametric optimization problem. A numerical technique to determine the optimal number of the redundant members to introduce the initial prestressing forces has been offered for high-order statically indeterminate bar structures. It reduces the dimension for the design variable vector of unknown initial prestressing forces for considered optimization problems.
Źródło:
Archives of Civil Engineering; 2020, 66, 3; 525-540
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 91

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