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Wyświetlanie 1-15 z 82
Tytuł:
The efficiency analysis of an asynchronous generator supplying single-phase receiver sets in an agricultural farm
Analiza efektywnosci generatora asynchronicznego zasilajacego odbiorniki jednofazowe w gospodarstwie rolnym
Autorzy:
Makarski, P.
Scibisz, M.
Powiązania:
https://bibliotekanauki.pl/articles/792405.pdf
Data publikacji:
2011
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
asynchronous generator
generator efficiency
single-phase receiver
agricultural farm
electrical energy
combustion engine
energy network
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2011, 11
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concept of diagnostics of energy networks by means of vision system
Koncepcja diagnostyki sieci energetycznych z zastosowaniem systemów wizyjnych
Autorzy:
Wronkowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/329448.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
energy network
damage
diagnostics
vision system
UAV
camera
sieć energetyczna
uszkodzenie
diagnostyka
system wizyjny
kamera
Opis:
In diagnostics of power grids a very important role is played by vision methods. Currently, a relatively new technique is the use of modern, autonomous devices for images acquisition, which are further analysed. The paper presents an overall division of power grids, discussion on the most common damages and effects of failures in these networks. Examples of currently used diagnostic methods of energy networks are presented and examples resulting from a review of modern vision techniques (methods of image acquisition and analysis) are listed. However, it can be noticed that there is still a need of further developing these techniques and striving for automatisaton of the diagnosing process. The paper contains a description of a concept of diagnostic method of energy networks, which includes the application (usage) of an autonomous, unmanned aerial vehicle to obtain the data. Some techniques of artificial intelligence for automated reasoning about the energy networks condition are planned to be applied.
W diagnostyce sieci energetycznych bardzo dużą rolę ogrywają metody wizyjne. Obecnie, stosunkowo nową techniką jest zastosowanie nowoczesnych, autonomicznych urządzeń do pozyskiwania obrazów sieci w celu ich dalszej analizy. W niniejszym artykule przedstawiono ogólny podział sieci energetycznych, omówiono najczęściej występujące uszkodzenia oraz skutki awarii w tych sieciach. Przedstawiono przykłady obecnie stosowanych metod diagnostyki sieci energetycznych i wymieniono przykłady z przeglądu nowoczesnych technik wizyjnych (sposób akwizycji obrazów i ich analiza). Zauważyć jednak można potrzebę dalszego rozwoju tych technik oraz dążenia do automatyzacji procesu diagnostyki. W artykule opisano koncepcję metody diagnostyki sieci energetycznych zawierającej zastosowanie autonomicznego, bezzałogowego statku latającego do pozyskiwania danych. Planowane jest zastosowanie różnych technik sztucznej inteligencji w celu automatycznego wnioskowania o stanie sieci energetycznych.
Źródło:
Diagnostyka; 2014, 15, 2; 13-18
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A hybrid method for the optimal reactive power dispatch and the control of voltagesin an electrical energy network
Autorzy:
Benchabira, Aissa
Khiat, Mounir
Powiązania:
https://bibliotekanauki.pl/articles/140740.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrical energy network
interior point method (IPM)
optimal reactive power dispatch (ORPD)
particle swarm optimization (PSO)
Opis:
This paper presents the resolution of the optimal reactive power dispatch (ORPD) problem and the control of voltages in an electrical energy system by using a hybrid algorithm based on the particle swarmoptimization (PSO) method and interior point method (IPM). The IPM is based on the logarithmic barrier (LB-IPM) technique while respecting the non-linear equality and inequality constraints. The particle swarmoptimization-logarithmic barrier-interior point method (PSO-LB-IPM) is used to adjust the control variables, namely the reactive powers, the generator voltages and the load controllers of the transformers, in order to ensure convergence towards a better solution with the probability of reaching the global optimum. The proposed method was first tested and validated on a two-variable mathematical function using MATLAB as a calculation and execution tool, and then it is applied to the ORPD problem to minimize the total active losses in an electrical energy network. To validate the method a testwas carried out on the IEEE electrical energy network of 57 buses.
Źródło:
Archives of Electrical Engineering; 2019, 68, 3; 535-551
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Developments in a Two-criteria Approach to Dynamic Power Management in Energy-aware Computer Networks
Autorzy:
Karbowski, A.
Jaskóła, P.
Powiązania:
https://bibliotekanauki.pl/articles/309427.pdf
Data publikacji:
2016
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
data-intensive computing
energy-aware network
energy-aware routing
dynamic power management
MIQP problems
traffic engineering
Opis:
In the paper authors continue the development of a model of dynamic power management in energy-aware computer networks, where two criteria: energy consumption and the quality of service are considered. This approach is appropriate when the routing problem with fixed demands is inadmissible. The formulation introducing edge indices is modified and tests on problems of different sizes are performed.
Źródło:
Journal of Telecommunications and Information Technology; 2016, 2; 21-25
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heuristic energy-saving virtual network embedding algorithm based on Katz centrality
Autorzy:
Zhu, Qiang
Wang, Qing-Jun
Zang, Mu-Jun
Wang, Zhen-Dong
Xiao, Chang
Powiązania:
https://bibliotekanauki.pl/articles/141679.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
energy-saving virtual network
integer linear programming
Katz centrality
network virtualization embedding
virtualization
Opis:
Current networks are designed for peak loads leading to low utilization of power resources. In order to solve this problem, a heuristic energy-saving virtual network embedding algorithm based on the Katz centrality (Katz-VNE) is proposed. For solving an energy-saving virtual network embedding problem, we introduce the Katz centrality to represent the node influence. In order to minimize the energy consumption of the substrate network, the energy-saving virtual network embedding problem is formulated as an integer linear program, and the Katz-VNE is used to solve this problem. The Katz-VNE tries to embed the virtual nodes onto the substrate nodes with high Katz centrality, which is effective, and uses the shortest paths offering the best factor of bandwidths to avoid the hot nodes. The simulation results demonstrate that the long-term average energy consumption of the substrate network is reduced significantly, and the long-term revenue/cost ratio, the acceptance rate of virtual network requests, and the hibernation rate of substrate nodes as well as links are improved significantly.
Źródło:
Archives of Electrical Engineering; 2020, 69, 3; 595-608
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scheduling Based Wireless Sensor Networks Integrated with IoT Environment
Autorzy:
Mahendran, N.
Powiązania:
https://bibliotekanauki.pl/articles/1193556.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Data Scheduling Schemes
Energy Efficient
IoT
Network lifetime
Sensor Network
Opis:
Wireless Sensor networks are widely adopt in military, target tracking, signal processing and monitoring applications like traffic and structural, the small and low cost unreliable sensor nodes in these applications uses batteries as the sole energy source. The energy efficiency becomes difficult task as the tiny and less weight battery act as source of each node. Scheduling the different category of data packets is a way to reduce the power consumption and increasing the lifetime of sensor nodes. The existing scheduling algorithms are not adapted to the environment changes. The basic FCFS (First Come First Serve) suffered by long delay while transmit the real time data packets. In DMP (Dynamic Multilevel Priority) real time data packets occupies highest priority, the remaining non real time data packets sent to lower priority level queues. Some real time task holds the resources for longer time, the other task have to wait, it makes the deadlock condition. The NJN (Nearest Job Next) will select the nearest requesting sensor node for service, real time packets have to wait long time. The proposed Adaptive weighted scheduling scheme changes the behavior of the network queue by adaptively changes the weights based on network traffic. Simulation results proof that, adaptive weighted scheduling algorithm works better than the FCFS and DMP data scheduling in terms of energy consumption and lifetime. Our future scheme to integrate Internet of Things (IoT) with the WSN to increase the performance of the wireless networks.
Źródło:
World Scientific News; 2016, 41; 116-127
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EEULA: an energy-aware event-driven unicast algorithm for wireless sensor network by learning automata
Autorzy:
Kashani, A. A. S.
Noori, A. M. M.
Powiązania:
https://bibliotekanauki.pl/articles/102180.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
network lifetime
wireless sensor network
learning automata
energy efficiency algorithm
Opis:
Energy consumption is one of the major challenges in wireless sensor networks, thus necessitating an approach for its minimization and for load balancing data. The network lifetime ends with the death of one of its nodes, which, in turn, causes energy depletion in and partition of the network. Furthermore, the total energy consumption of nodes depends on their location; that is, because of the loaded data, energy discharge in the nodes close to the base station occurs faster than other nodes, the model presented here, through using learning automata, selects the path appropriate for data transferring; the selected path is rewarded or penalized taking the reaction of surrounding paths into account. We have used learning automata for energy management in finding the path; the routing protocol was simulated by NS2 simulator; the lifetime, energy consumption and balance in an event-driven network in our proposed method were compared with other algorithms.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 30; 9-18
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Probabilistic gas transmission network simulator and application to the EU gas transmission system
Autorzy:
Kopustinskas, V.
Praks, P.
Powiązania:
https://bibliotekanauki.pl/articles/2069293.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
gas network
energy security
reliability
Monte Carlo
Opis:
The paper describes the methodology approach and the results obtained by the probabilistic gas network simulator ProGasNet software tool. The ProGasNet has been applied to a number of test cases, all based on real gas transmission networks of the EU countries. Various types of analysis have been performed: reliability, vulnerability, security of supply and various types of results have been reported: supply reliability estimates, time-dependent storage discharge effect, quantitative effects of new infrastructure, security of supply under different disruption scenarios. The ProGasNet model provides an indication of the worst networks nodes in terms of security of supply and provides their numerical ranking. The model is very powerful to compare and evaluate different supply options, new network development plans and analyse potential crisis situations
Źródło:
Journal of Polish Safety and Reliability Association; 2015, 6, 3; 71--78
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reactive energy compensator effect on the reliability of a complex electrical system using Bayesian networks
Autorzy:
Reffas, Omar
Sahraoui, Yacine
Nahal, Mourad
Ghoul, Rachida Hadiby
Saad, Salah
Powiązania:
https://bibliotekanauki.pl/articles/1844423.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
STATCOM
reliability
Complex Electrical System
reactive energy
Bayesian network
Opis:
The static synchronous compensator is presented in order to improve an electrical network system performance. The present work aims to develop a Bayesian methodology for assessing the time-variant reliability of a complex electrical system taking into account reactive energy compensator (STATCOM). However, the complex aspect is not only related to the complexity of electrical system components architecture, nevertheless is allied to electrical network and STATCOM interactions. The Bayesian network is used for coping with this complexity constraint. The reliability-based assessment of reactive energy compensator effect is applied to a real case of a complex electrical system. The proposed Bayesian methodology application reveals that the STATCOM has a significant influence on electrical system reliability and the developed model can provide valuable information for decision makers to improve the system reliability performance.
Źródło:
Eksploatacja i Niezawodność; 2020, 22, 4; 684-693
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific features and models of electric power consumption by household - type consumers
Autorzy:
Frąckowiak, R.
Gałan, T.
Powiązania:
https://bibliotekanauki.pl/articles/97403.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electric power consumption
power consumption
power network
electrical energy
Opis:
In the paper, the results of analysis of the load curves for the household - type consumers fed from the LV electric power network are presented. In the study, the influence of the sunset time and ambient temperature on the electric load curves has been assessed and, consequently, the specific features of the graphs for the allocated consumer groups have been defined. Also, suitable models considering the impact of the observed factors on the electrical energy consumption have been developed. Energy consumption in the tariff zones by the consumers settled according to G12 tariff has been of special interest.
Źródło:
Computer Applications in Electrical Engineering; 2012, 10; 264-274
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Analysis of Distribution Network Cost Allocation Alternatives
Autorzy:
Guarizi, Rodrigo Delfim
Lotero, Roberto C.
London, Joâo Bosco A.
Powiązania:
https://bibliotekanauki.pl/articles/24024684.pdf
Data publikacji:
2023
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
energy resources
fixed costs
allocation cost tasks
distribution network
Opis:
This paper presents a comparative study among methods of allocation of fixed costs in Distribution Networks (DNs). The application of these methods allows obtaining distribution use-of-system charges. Three pricing mechanisms composed of two part tariffs are evaluated. In the three mechanisms, the first part is obtained by the Long Run Incremental Cost (LRIC) method. The second one is determined by the following methods: Postage Stamp (PS), MW-Mile (MWM) or Ramsey-Boiteux (RB). The characterization and comparison of each method are performed from the point of view of regulatory principles that define guidelines on network pricing. The results allow identifying the adherence of the methods in compliance with the regulatory principles. Conflicting character between different principles is observed. The methods are tested and validated in the IEEE13-node distribution network. A study along these lines points to the proposition of new alternatives in pricing the use of DNs in the face of the growth of Distributed Energy Resources.
Źródło:
Transactions on Environment and Electrical Engineering; 2023, 5, 1; 1--8
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study of Wireless Sensor Networks to Comprehend their Relevance to Different Applications
Autorzy:
Agarkhed, Jayashree
Dattatraya, Patil Yogita
Patil, Siddarama
Powiązania:
https://bibliotekanauki.pl/articles/308904.pdf
Data publikacji:
2020
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
clustering
energy efficiency
multipath-based routing
wireless sensor network
Opis:
Wireless sensor networks (WSNs) have experienced enormous growth, both in terms of the technology used and their practical applications. In order to understand the features of WSNs that make the solution suitable for a specific purpose, one needs to be aware of the theoretical concepts behind and technological aspects of WSNs. In this paper, the significance of WSNs is illustrated, with a particular emphasis placed on their demands and on understanding researchrelated problems. A review of the literature available is presented as well. Detailed discussions concerning sensor node architecture, different types of sensors used and their relevance for various types of WSNs is presented, highlighting the need to achieve application-specific requirements without degrading service quality. Multipath and cluster-based routing protocols are compared in order to analyze QoS requirements they are capable of satisfying, and their suitability for different application areas is reviewed. This survey highlights the performance of different routing protocols, therefore providing guidelines enabling each of the routing techniques to be used, in an efficient manner, with factors such as specific network structure, protocol operation and routing path construction taken into consideration in order to achieve better performance.
Źródło:
Journal of Telecommunications and Information Technology; 2020, 2; 3-13
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Residual Energy-Aware Clustering Transformation for LEACH Protocol
Autorzy:
Ullas, P.
Shivaprakasha, K. S.
Powiązania:
https://bibliotekanauki.pl/articles/1839356.pdf
Data publikacji:
2021
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cluster formation
cluster head
residual energy
wireless sensor network
Opis:
Energy is one of the crucial performance parameters in wireless sensor networks (WSNs). Enhancement of network lifetime is an important consideration as well. Low energy-aware clustering hierarchy (LEACH) is one of the protocols proposed for WSNs. In this paper, a residual energy-aware clustering transformation protocol for LEACH (REACT-LEACH), enhancing performance of LEACH by introducing a clustering mechanism, is proposed. The proposed cluster head (CH) rotation and cluster reformation processes are more effective in REACT-LEACH, as residual energy is considered to be one of the metrics. Performance of REACT-LEACH is validated based on simulations.
Źródło:
Journal of Telecommunications and Information Technology; 2021, 2; 31-36
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using collaborative management in industrial clusters – case study of Italian energy cluster
Autorzy:
Taurino, T.
Powiązania:
https://bibliotekanauki.pl/articles/407255.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
collaboration
collaborative networks
collaborative economy
network contract
energy cluster
Opis:
In the current industrial scenarios those involved in production and services distribution are called to deal with a plurality of stakeholders, considering different interests, readings and positions. This paper exploits the concept of collaboration in this fast changes and flexible scenario by describing the characteristics of collaboration among enterprises and their scope. In this context, the purpose of all managers to maximize utility, to save cost or to minimize of transaction costs is hard to be reached. Under this prospective, to collaborate with other firms is a logical way to work and to pursue the previous objectives. The purpose of this paper is to define all the aspects of collaboration, mainly among enterprises, and the reasons that can drive a manager to stipulate a collaboration agreement. Two different ways, through collaboration can rise, have been described: collaboration induced by external body (top-down collaboration) or born in a spontaneous way (bottom-up). The management of the collaboration and the identification of key performance indicators, able to control the development of the network system, is addressed by exploiting the Italian network contract and the case study of the energy cluster.
Źródło:
Management and Production Engineering Review; 2018, 9, 4; 138-149
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of crashworthiness indicators of column energy absorbers with triggers in the form of cylindrical embossing on the lateral edges using artificial neural networks
Autorzy:
Ferdynus, Mirosław
Gajewski, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/2200938.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
crashworthiness indicators
energy absorber
thin-walled tube
artificial neural network
Opis:
The paper presents the possibility of neural network application in order to identify the most advantageous design variants of column energy absorbers in terms of the achieved energy absorption indicators. Design variants of the column energy absorber made of standard thin-walled square aluminium profile with triggers in the form of four identical cylindrical embossments on the lateral edges were considered. These variants differ in the diameter of the trigger, its depth and position. The geometrical parameters of the trigger are crucial for the energy absorption performance of the energy absorber. The following indicators are studied: PCF (Peak Crushing Force), MCF (Mean Crushing Force), CLE (Crash Load Efficiency), SE (Stroke Efficiency) and TE (Total Efficiency). On the basis of numerical studies validated by experimentation, a neural network has been created with the aim of predicting the above-mentioned indices with an acceptable error for an energy absorber with the trigger of specified geometrical parameters and position. The paper demonstrates that the use of an effective multilayer perceptron can successfully speed up the design process, saving time on multivariate time-consuming analyses.
Źródło:
Eksploatacja i Niezawodność; 2022, 24, 4; 805--821
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 82

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