Wyniki wyszukiwania - BazTech

1

Proposal of a new metaheuristic for the picker’s route designation in warehouse management

Dmytrów Krzysztof, Dudek Andrzej

Operations Research and Decisions

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2025

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Vol. 35, No. 3

51--71

EN

The order picking is the most time- and work-consuming component of total warehouse operations. As traveling takes up the most of the order picking time, reduction of the picker’s route length can help decreasing it. The aim of the research is to develop a new routing metaheuristic with the use of R language for designing the picker’s route in warehouse management that will provide better results than other, widely used routing heuristics. We apply the proposed metaheuristic in the classical, picker-to-parts, one-block rectangular warehouse with random storage assignment. We compare the results with the results obtained by its means with the most widely used routing heuristics: s-shape, return and midpoint. We assume the shared storage and various take-out strategies. Locations to be visited were obtained by using the COPRAS Complex Proportional Assessment) method. The criterion for assessment of applied metaheuristic is the length of the picking route for every takeout strategy. Obtained results indicate that the proposed metaheuristic provided shorter routes as compared with other routing heuristics.

2

Semi-Markov model of MASS voyage

Abramowicz-Gerigk Teresa, Burciu Zbigniew, Soszynska-Budny Joanna, Weintrit Adam

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2024

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Vol. 18 No. 4

937--941

EN

The paper presents the readiness/safety model for the sea voyage of Maritime Autonomous Surface Ship (MASS), based on Semi-Markov process. The states of MASS during the voyage were defined as triplets of intentional type of MASS operations, reliability state and safety state, dependent on weather conditions. The determined states were aggregated, and the disjoint subsets were used to build a macro-model of MASS voyage process. An example of changes of MASS states during the sea voyage, for Gdynia - Port Everglades connection, is presented and discussed in the paper. The Semi-Markov process was used for the analysis of MASS reliability and safety during the sea voyage. The obtained matrix of transition probabilities between the states of MASS during the voyage can be used by MASS operator in Remote Operations Centre to make decisions related to voyage planning. The proposed model can constitute the basis of a computer program supporting the decision-making process of the operator.

3

Comparative assestment of the effect of changing the breadth (b) of the ship on the stability of the tugboat

Alamsyah A., Fikri M., Suardi Suardi, Pawara Muhammad Uswah, Ikhwani R.J., Setiawan Wira, Paroka D.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2024

|

Vol. 18 No. 4

905--914

EN

This paper reviews the effect of changing the breadth of a tugboat before and after production on ship stability. The numerical simulation method (maxurf stability) is applied. Likewise, another approach uses the Benjamin Spence (integrator) method. The standard used is IMO. Several limits become parameters for assessing the increase and decrease in ship stability. Several ship load cases are simulated to produce righting arm curves. The construction of a tugboat with a length of 28 meters is the object of this research as a case study. We compared the righting arm curve from the Maxurf stability analysis with Benjamin Spence's analysis to confirm the accuracy of the calculation results. Both methods show a significant influence regarding changes in the breadth of the tugboat. The produced righting arm curve consistently shows changes in the stability and performance of the ship. There is a reduction in the area under the GZ curve. The IMO provides three of the five standards and recommendations regarding the area under the GZ curve. The reduction of the area under the GZ curve is 17~22% for the Benjamin Spence method and 12~18% for the Maxurf stability. This percentage applies to all load-case simulations. This research contributes to providing an understanding of the effect of changes in ship width on decreasing stability.

4

The Influence of Physical Properties of C55 Alloy on Geometry of Flow in the Process of Shaping

Nabrdalik Marcin, Sobociński Michał

Archives of Metallurgy and Materials

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2024

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Vol. 69, iss. 1

353--357

EN

The paper presents analysis of influence of change of physical parameters such as: temperature, friction coefficient and load, during the process of die forging. Optimization of the process effects in achieving high quality products, decreasing shaping resistance, and what follows - lower energy consumption. Temperature is the basic factor affecting the process of plastic working. Analyzing that influence in individual die fragments, allows to engineer the flow of shaped material. The QForm3D commercial program for finite element method calculations was used for numerical simulations. The paper presents multi-variant analysis of forging process with the usage of numerical simulation, which provided many valuable information concerning changes of key parameters, such as: temperature, stress and strain distribution and variations of technological parameters, as well as their mutual influence, difficult to obtain in analysis of industrial process.

5

Spectral dynamic analysis of a stationary jack-up platform

Rozmarynowski Bogdan

Polish Maritime Research

|

2019

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nr 1

40--48

EN

The paper refers to the dynamic short-term response analysis of the Baltic steel drilling platform (see Fig.2) in a random sea-state represented by one-dimensional wave spectrum proposed by Striekalov and Massel, which is recommended for the Baltic Sea area. The Baltic drilling platform is a jack-up type platform for the exploration and exploitation of oil under the Baltic Sea. The presented analysis deals with the stationary phase of the platform life when its legs are fixed in the sea bottom. The submerged elements of jack-up platforms are relatively slender, thus to assess the in-line wave forces a modified Morison equation is justified. The application of frequency transfer functions to offshore vibration systems leads to structural response spectra whose input is defined by the wave elevation and wind velocity spectra. The analysis can be applied also to support structures for offshore wind turbines.

6

A brief overview about the development of torsional vibration calculation and education of methods for their calculation

Zoul V., Kováč P.

Zeszyty Naukowe. Transport / Politechnika Śląska

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2018

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z. 99

205--211

EN

Torsional vibration calculation (TVC) is among the basic calculations that are required to support propulsion projects for various vehicles, ships and construction machines. A number of powerful software packages for these calculations already exists. However, the need to respect the physical properties of propulsion systems that are more complex than before has arisen. At the same time, knowledge about system properties and the capabilities of computing systems are also growing, resulting in an increase in new software systems, which could be used for these calculations. In this paper, these new trends are briefly described, with attention paid not only to practical use, but above all to how and to what extent these themes should be presented to students.

7

Wybrane aspekty wykorzystania elementów probabilistycznych w planowaniu rozwoju sieci przesyłowej

Kubek P., Przygrodzki M.

Przegląd Elektrotechniczny

|

2018

|

R. 94, nr 12

108--111

PL

Realia funkcjonowania systemu elektroenergetycznego mają często charakter losowy, przez co odwzorowanie uwarunkowań wpływających na ocenę obciążeń elementów sieci naturalnie prowadzi do zastosowania metod probabilistycznych. W artykule opisano możliwości i metody wykorzystania podejścia probabilistycznego w procesie planowania rozwoju sieci przesyłowej. Wykorzystanie podejścia probabilistycznego pozwala na zwiększenie efektywności procesu, a w szczególności podejmowanych decyzji modernizacyjnych i inwestycyjnych.

EN

The realities of the power system operation are often of a random nature, whereby the mapping of conditions affecting the assessment of grid elements loads naturally leads to the use of probabilistic methods. The article describes the possibilities and methods of using the probabilistic approach in the process of planning the development of the transmission grid. The use of the probabilistic approach allows to increase the efficiency of the process, and in particular the modernization and investment decisions made.

8

Selected problems of sensitivity and reliability of a jack-up platform

Rozmarynowski B., Mikulski T.

Polish Maritime Research

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2018

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nr 1

77--84

EN

The paper deals with sensitivity and reliability applications to numerical studies of an off-shore platform model. Structural parameters and sea conditions are referred to the Baltic jack-up drilling platform. The sudy aims at the influence of particular basic variables on static and dynamic response as well as the probability of failure due to water waves and wind loads. The paper presents the sensitivity approach to a generalized eigenvalue problem and evaluation of the performace functions. The first order time-invariant problems of structural reliability analysis are under concern.

9

Petri Nets for Modelling and Analysing Trophic Networks

Baldan P., Bocci M., Brigolin D., Cocco N., Heiner M., Simeoni M.

Fundamenta Informaticae

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2018

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Vol. 160, nr 1/2

27--52

EN

We consider trophic networks, a kind of networks used in ecology to represent feeding interactions (what-eats-what) in an ecosystem. Starting from the observation that trophic networks can be naturally modelled as Petri nets, we explore the possibility of using Petri nets for the analysis and simulation of trophic networks. We define and discuss different continuous Petri net models, whose level of accuracy depends on the information available for the modelled trophic network. The simplest Petri net model we construct just relies on the topology of the network. We also propose a technique for deriving a more refined model that embeds into the Petri net the known constraints on the transition rates that represent the knowledge on metabolism and diet of the species in the network. Finally, if the information of the biomass amounts for each species at steady state is available, we discuss a way of further refining the Petri net model in order to represent dynamic behaviour. We apply our Petri net technology to a case study of the Venice lagoon and analyse the results.

10

The impact of building parameters and way of operation on the operative temperature in rooms

Kaczmarczyk J., Ferdyn-Grygierek J., Baranowski A.

Architecture Civil Engineering Environment

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2018

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Vol. 11, no. 2

107--114

EN

The control of the thermal environment and the assessment of the quality of rooms in terms of thermal comfort of users is often based solely on the measurement of the air temperature. Proper assessment should, however, be based on an analysis of the operative temperature, which, in many cases, differs from the air temperature in the room. The operative temperature takes into account also the influence of surrounding building partitions on building occupants due to thermal radiation. The paper analyzes the impact of building elements such as the construction of the building walls, the size of the glazing, building orientation, as well as the way the building is operated on the differences between the air temperature and the operating temperature. Multivariate simulation analyzes were carried out for an exemplary office room using the IDA Indoor Climate and Energy (IDA ICE) program.

PL

Kontrola środowiska cieplnego i ocena jakości pomieszczeń pod kątem komfortu cieplnego użytkowników jest często oparta wyłącznie na pomiarze temperatury powietrza. Właściwa ocena powinna jednak zawierać analizę temperatury operatywnej, która, w wielu przypadkach, różni się od temperatury powietrza w pomieszczeniu. Temperatura operatywna uwzględnia także oddziaływanie otaczających przegród budowlanych na użytkowników wskutek promieniowania cieplnego. W artykule przeanalizowano wpływ takich elementów budynku jak konstrukcja ścian budynku, wielkość oszklenia, orientacja względem stron świata, a także sposób eksploatacji budynku na różnice między temperaturą powietrza a temperaturą operatywną. Wielowariantowe analizy symulacyjne przeprowadzono dla przykładowego pomieszczenia biurowego wykorzystując program IDA Indoor Climate and Energy (IDA ICE).

11

Wykorzystanie wybranych metod symulacyjnych w obliczeniach probabilistycznego rozpływu mocy

Przygrodzki M., Lubicki W.

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

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2017

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Nr 53

61--64

PL

Rozpływ mocy jest zadaniem wyznaczenia wartości napięć węzłowych oraz obciążeń gałęziowych w danym stanie systemu elektroenergetycznego. W przypadku probabilistycznego rozpływu zarówno dane wejściowe zadania, jak i wyniki obliczeń mają postać rozkładów prawdopodobieństwa. Rozkłady te można określić dla zapotrzebowania na moc, dostępności i poziomu generacji mocy w węzłach oraz struktury układu sieciowego. W artykule przedstawiono wyniki porównania losowań przeprowadzonych metodą Monte Carlo oraz metodą LHS. Losowania te dotyczyły dostępności infrastruktury sieciowej. Obliczenia przeprowadzono w układzie sieciowym odwzorowującym krajową sieć zamkniętą 400 kV/220 kV/110 kV. Na podstawie przedstawionych wyników symulacji odniesiono się do możliwości wykorzystania metody LHS w prowadzeniu analiz probabilistycznego rozpływu mocy.

EN

Probabilistic power flow is such kind of power flow problem, for which the input data and calculation results have the form of probability distributions. Analogous to the deterministic power flow inputs are defined in the network nodes: the power and electricity demand, availability and level of power generation, defined as probability distributions. In addition, an input data structure is also the network system. The result of the calculation of power flow are probability distributions of voltage in grid nodes and branch power flows. The structure of the network, as part of the network model, understood as the availability of its individual components is a random variable. Variable distribution of binary: the element is on or off. Parameter of this distribution is the failure rate of the item, possibly increased by the rate of planned outage. Generally, the method of determining probabilistic power flow can be divided into simulation, analysis and approximation. Approximation and analytical methods are often combined into one group defined as an analytical method. To determine the value of the input data for the n-th simulation can be used different simulation methods, including Monte Carlo and Latin Hypercube Sampling (LHS). The article presents the results of the comparison draws conducted using Monte Carlo method and LHS. Drawings are concerned the availability of network infrastructure (lines). The calculations were carried out for the national 400 kV, 220 kV and 110 kV network. Simulation result shows possibility of Monte Carlo and LHS method usage for probabilistic power flow calculation.

12

Ocena poprawności metod symulacji komputerowej w badaniach hałasu kolejowego

Kuboszek A.

Systemy Wspomagania w Inżynierii Produkcji

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2017

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Vol. 6, iss. 6

149--158

PL

W artykule przedstawiono przykłady zastosowania komputerowych metod symulacji zjawisk akustycznych w procesie tworzenia strategicznej mapy hałasu. Artykuł przedstawia porównanie wyników badań uzyskanych w symulacji komputerowej i wyników pomiarów środowisku.

EN

The article presents examples of the use of computer simulation methods acoustic phenomena in the process of strategic noise maps. The article presents a comparison of test results obtained in computer simulations and measurements in the environment.

13

Ocena poprawności metod symulacji komputerowej w badaniach hałasu komunikacyjnego

Kuboszek A.

Systemy Wspomagania w Inżynierii Produkcji

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2017

|

Vol. 6, iss. 1

106--121

PL

W artykule przedstawiono przykłady zastosowania komputerowych metod symulacji zjawisk akustycznych w procesie tworzenia strategicznej mapy hałasu. Artykuł przedstawia porównanie wyników badań uzyskanych w symulacji komputerowej i wyników pomiarów w środowisku.

EN

The article presents examples of the use of computer simulation methods acoustic phenomena in the process of strategic noise maps. The article presents a comparison of test results obtained in computer simulations and measurements in the environment.

14

Towards Simulation Based Design

Skoberla R., Skarka W.

Machine Dynamics Research

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2017

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Vol. 41, No. 4

173--181

EN

This article presents the experience of the Smart Power team in applying advanced simulation methods. The basic techniques used in the development of complex technical objects have been characterized. The arguments for adopting the procedure were presented. Major areas, where advanced methods are required, are indicated.

15

Method for Reserve Determination of Static and Dynamic List of Bulk Carriers Applied to the Dynamic Under Keel Clearance System in the Port of Świnoujście

Drwięga K., Gucma L., Gralak R.

Annual of Navigation

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2017

|

No. 24

89--102

EN

The paper presents the methodology for determining the components which are related to heel of bulk carrier with one component excluded - the heel of vessel due to waves. The described method was applied to the system, which is dedicated to use in determination of UKC of vessels at the approach to the Port of Swinoujscie. The method includes determination of heel caused by: draught reading errors, wind, current, tugboats and heel related to vessel maneuvers. To determine heel related to vessel maneuver 2-stage method was carried out. The first stage simulation was used to identify the parameters of ship movement. At the second stage, the maximum heel of Bulk Carrier were calculated by using analytical methods. Presented method was implemented to the item rating under keel clearance at the approach to the Port of Swinoujscie.

PL

W artykule przedstawiono metodykę określania składników związanych z przechyłem Capesize masowca, nie uwzględniając przechyłu od falowania. W metodzie zawarto określenie składowych przechyłu od błędów odczytu zanurzenia jednostki, działania wiatru, prądu, holowników oraz przechyłu związanego z manewrami jednostki. Ostatnia składowa została określona za pomocą metody dwuetapowej. Na etapie pierwszym za pomocą metod symulacyjnych określono parametry ruchu jednostki. Następnie z użyciem metod analitycznych określono maksymalne przechyły masowca. Przedstawioną metodę zaimplementowano do systemu oceny zapasu wody pod stępką na akwenie podejściowym do Portu w Świnoujściu.

16

Use of LHS sampling to calculate probabilistic power flow

Przygrodzki M., Lubicki W.

Acta Energetica

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2017

|

nr 2

189--196

EN

Power flow is the task of determining node voltages and branch loads in a given state of the power system. In the case of probabilistic flow, the task’s input data and calculation results alike are in the form of probability distributions. These distributions can be specified for the power demand, power generation availability and levels in nodes, and grid configuration. Elements that make up the grid configuration may be assigned a binary distribution, the result of which determines the element’s status (on or off). This distribution characteristic parameter is the failure rate of the element. This paper presents the results of a comparison of Monte Carlo and LHS sampling. The sampling concerned grid infrastructure availability. Calculations were made for two grid systems with different sizes corresponding to the test model (ca. 50 branches) and the national transmission grid model (over 400 branches). Based on the results, conclusions were drawn as to the possibility of using LHS simulation in the probabilistic power flow calculation.

PL

Rozpływ mocy jest zadaniem wyznaczenia wartości napięć węzłowych oraz obciążeń gałęziowych w danym stanie systemu elektroenergetycznego. W przypadku probabilistycznego rozpływu zarówno dane wejściowe zadania, jak i wyniki obliczeń mają postać rozkładów prawdopodobieństwa. Rozkłady te można określić dla zapotrzebowania na moc, dostępności i poziomu generacji mocy w węzłach oraz konfiguracji układu sieciowego. Elementom tworzącym konfigurację układu sieciowego można przypisać rozkład dwustanowy, w wyniku którego określa się stan elementu (element pracuje lub jest wyłączony). Parametrem charakterystycznym tego rozkładu jest współczynnik awaryjności danego elementu. W artykule przedstawiono wyniki porównania losowań przeprowadzonych metodą Monte Carlo oraz metodą LHS. Losowania te dotyczyły dostępności infrastruktury sieciowej. Obliczenia przeprowadzono dla dwóch układów sieciowych o różnej liczebności odpowiadającej modelowi testowemu (około 50 gałęzi) oraz modelowi krajowej sieci przesyłowej (ponad 400 gałęzi). Na podstawie uzyskanych wyników sformułowano wnioski co do możliwości wykorzystania symulacji metodą LHS w obliczeniach probabilistycznego rozpływu mocy.

17

A method for reserve determination of the static and dynamic list of liquefied natural gas carriers and its application to the dynamic under keel clearance system in the outer port in Świnoujście

Drwięga K., Gucma L., Gralak R.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2016

|

nr 47 (119)

66--73

EN

This paper presents a methodology for determining the components related to the heel of liquefied natural gas (LNG) carriers, excluding the heel of the vessel due to waves. The described method was applied to the description of under keel clearance of vessels approaching the outer port of Świnoujście. The method includes the determination of heel components caused by: draught reading errors, wind, current, tugboats and vessel maneuvers. Determination of the last component was carried out using a 2-stage method. In the first stage, simulation methods were used to identify the parameters of ship movement. In the second stage, the maximum heel of LNG carriers was calculated by analytical methods.

18

Zastosowanie metod symulacji komputerowej w badaniach hałasu przemysłowego

Kuboszek A.

Systemy Wspomagania w Inżynierii Produkcji

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2016

|

z. 2 (14)

199--210

PL

W artykule przedstawiono przykłady wykorzystania komputerowych metod symulacji zjawisk akustycznych w pracach projektowych zmierzających do opracowania optymalnych sposobów ograniczenia hałasu na stanowisku pracy. Zastosowanie symulacji komputerowej daje możliwość opracowania strategii prac wyciszeniowych najkorzystniejszej pod kątem skuteczności akustycznej oraz opłacalności ekonomicznej.

EN

This paper presents examples of using computer-based methods of acoustic simulation for optimal designing of noise reduction projects at the workplaces. Using of the acoustic simulations provides the opportunity to develop optimal strategies for noise reduction in terms of acoustic efficiency and cost-effectiveness.

19

Research method of dynamic capability of an actuating block of the SSP-FK aircraft fire suppression system in false alarm aspect

Szelmanowski A., Zieja M., Głyda K., Tokarski T.

Journal of KONES

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2016

|

Vol. 23, No. 3

525--531

EN

Numerous cases of self-activation of the SSP-FK aircraft fire suppression system (including commissioning of valves and extinguishing tanks) testify about the fact that it is not yet fully understood in the technical aspect, and because of the performed role on the aircraft is the basic element to ensure flight safety. Solving problems with false fire signalling of the SSP-FK system is an important issue for the safe operation of aircraft and military helicopters, because it is preventive (to warn the crew of the possibility of fire) and rescue system (aiming at extinguish the fire) in each phase of a flight. In addition, the SSP-FK system is used on many types of military aircraft (including helicopters from W-3/3W/3WA/3PL and Mi/8/14/17/24 family as well as An-28 and Tu-154M aircraft. The paper presents selected results of work in the Air Force Institute of Technology in the study of SSP-FK fire suppression system (as one of the main protection systems on-board) used on many types of military aircraft operated in the Polish Armed Forces. In determining the conditions of the false signalling of fire, simulation models of action blocks implementing of the SSP-FK fire suppression system were developed. The research on simulation models was performed in Matlab-Simulink and Circuit-Maker computing packages. The results of these works were used to diagnose selected modules and blocks of the SSP-FK system during the study of actual cases of their false activation.

20

Cooling demand in museum premises – numerical prediction and measurement validation

Ferdyn-Grygierek J., Baranowski A.

Architecture Civil Engineering Environment

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2016

|

Vol. 9, no. 2

125--135

EN

The paper presents the results of identification and assessment of the energy demand for cooling purposes in the museum building. The analysis of cooling demand and assessment of indoor air quality were performed by the simulation analysis and validated by the measurement campaign of the indoor air quality in the building under consideration. For the purpose of thermal analysis the IDA ICE software was used. All simulations were carried out using meteorological data recorded by the local weather station. The results of the study indicate the necessity to use cooling in the museum premises. Presented analysis of the heat loads, which can occur in the exhibition rooms, can be helpful in making the decision about the installation of air conditioning systems in the museum, especially when thermal renovation of the building is planned. Such system can guarantee proper protection of the exhibits as well as thermal comfort for visitors.

PL

Artykuł przedstawia wyniki wielowariantowej analizy i oceny zapotrzebowania energii na cele chłodzenia w wybranym budynku muzeum. Analizy zapotrzebowania na chłód i oceny jakości powietrza wewnętrznego przeprowadzono na bazie symulacji komputerowej wykorzystując do tego celu program IDA ICE. Model obejmujący sale wystawowe został zwalidowany i dopasowany na podstawie danych pomiarowych parametrów środowiska wewnętrznego. Wszystkie obliczenia przeprowadzono w oparciu o dane meteorologiczne zarejestrowane przez lokalną stację meteo. Symulacje wykazały potrzebę chłodzenia sal wystawowych w okresie letnim. Zaprezentowane analizy obciążeń cieplnych w salach wystawowych mogą być pomocne przy podejmowaniu decyzji w spawie instalacji systemu klimatyzacji, który będzie gwarantować właściwą ochronę eksponatów, jak również komfort cieplny osób zwiedzających, szczególnie w przypadku planowania termomodernizacji budynku.