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Tytuł:
Control of squirrel-cage electric generators in a parallel intermediate DC circuit connection
Autorzy:
Kozak, M.
Gordon, R.
Bejger, A.
Powiązania:
https://bibliotekanauki.pl/articles/135529.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
back-to-back
DC link
power distribution
VSI
FOC
power machine
Opis:
The paper covers the theoretical background and tests of two asynchronous squirrel cage generators connected to voltage source inverters working in parallel. Inverters were connected in parallel by their intermediate direct current circuits by means of auctioneering diodes, and then to a DC power network. The real-time control algorithm of digital signal processor DSP and field-programmable gate array FPGA was used to achieve proper excitation of two different power machines, and to maintain high enough levels of direct current link voltage. Windings of both generators are fed by use of so-called machine side inverters. The asynchronous generator is a voltage source inverter controlled by a field-oriented control algorithm based on the current machine model. To prove robustness of the chosen algorithm, different types of load were applied while generators and inverters worked in parallel.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 45 (117); 17-22
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of efficiency of cascade power machines of locomotives
Ocenka ehffektivnosti kaskadnykh ehnergeticheskikh ustanovok lokomotivov
Autorzy:
Starcheous, Y.
Voronov, O.
Kovtun, A.
Powiązania:
https://bibliotekanauki.pl/articles/793114.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
cascade power machine
locomotive
cascade pressure exchanger
railway transport
mass exchange
recovery
efficiency
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2013, 13, 3
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecological Aspects in the Process of Turning Cast Iron with Coated Tools
Autorzy:
Jenek, Mariusz
Ociepa, Michał
Woźniak, Waldemar
Vilamová, Šárka
Švecová, Eva
Powiązania:
https://bibliotekanauki.pl/articles/2174910.pdf
Data publikacji:
2022
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
machining
PVD coating
machine power consumption
Opis:
The article presents the research results on the influence of the PVD coating on the cutting tool on the surface roughness and energy consumption in the cast iron turning process. It was shown that using coated tools leads to obtaining a surface qualitatively corresponding to the ground surface and to reducing the power consumption of the machine tool. In addition, the process itself, carried out without a cooling and lubricating liquid, is more eco-friendly, as it excludes its use, disposal and negative environmental impact.
Źródło:
Rocznik Ochrona Środowiska; 2022, 24; 360--370
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Limiting distribution of the three-state semi-Markov model of technical state transitions of ship power plant machines and its applicability in operational decision-making
Autorzy:
Girtler, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/258958.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
decision
probability
ship power plant machine
semi-Markov process
ship internal combustion engine
Opis:
The article presents the three-state semi-Markov model of the process {W(t): t > 0} of state transitions of a ship power plant machine, with the following interpretation of these states: s1 – state of full serviceability, s2 – state of partial serviceability, and s3 – state of unserviceability. These states are precisely defined for the ship main engine (ME). A hypothesis is proposed which explains the possibility of application of this model to examine models of real state transitions of ship power plant machines. Empirical data concerning ME were used for calculating limiting probabilities for the process {W(t): t > 0}. The applicability of these probabilities in decision making with the assistance of the Bayesian statistical theory is demonstrated. The probabilities were calculated using a procedure included in the computational software MATHEMATICA, taking into consideration the fact that the random variables representing state transition times of the process {W(t): t > 0} have gamma distributions. The usefulness of the Bayesian statistical theory in operational decision-making concerning ship power plants is shown using a decision dendrite which maps ME states and consequences of particular decisions, thus making it possible to choose between the following two decisions: d1 – first perform a relevant preventive service of the engine to restore its state and then perform the commissioned task within the time limit determined by the customer, and d2 – omit the preventive service and start performing the commissioned task.
Źródło:
Polish Maritime Research; 2020, 2; 136-144
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification and verification of simulation model of gears working in circulating power system
Identyfikacja i weryfikacja modelu symulacyjnego przekładni zębatych pracujących w układzie mocy krążącej
Autorzy:
Łazarz, B.
Peruń, G.
Powiązania:
https://bibliotekanauki.pl/articles/327270.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
przekładnia zębata
stanowisko FZG
model dynamiczny
gearbox
power circulating gear testing machine
dynamic model
Opis:
This article presents executed stages of preparing and identification a power circulating gear testing machine. The purposefulness of modelling this test-stand was justified by its popularity and universal character that enabled to apply it in many laboratory research works. It was assumed that property defined and next identified model would be used to analyze dynamic phenomena in meshing and bearings of examined gears and it enabled to optimize their construction, especially to minimize their vibroactivity. The described model combines advantages of two main modelling directions: it is characterized by very accurate analyzes of a model of toothed wheels pair, that includes nonlinear description of properties of both gears meshing in a test-stand (examined and closing), as well as it includes the influence of remaining system's elements, which enables to examine the dynamics of a system as a whole. Calculation algorithm additionally includes possibility to simulate faults of wheels in the examined gear, such as chipping of tooth tips, tooth root crack together with possible faults of rolling bearings elements. The article includes description of the construction of a test-stand, dynamic system model with detailed parameters as well as short characteristics of the simulation program and purposes of its main modules. Next the research works, which aimed at identification of selected parameters of the model, were presented. Afterwards it was verified whether the model was correctly fine tuned by means of measuring the velocity of transversal vibrations at the test-stand using Ometron VH300+ laser vibrometer, and results of laboratory examinations were compared with the results achieved during computer simulation.
W artykule przedstawione zostały zrealizowane etapy opracowywania i dostrajania modelu stanowiska z przekładniami zębatymi pracującymi w układzie mocy krążącej (FZG). O celowości modelowania tego stanowiska zadecydowała jego popularność i uniwersalność, pozwalająca wykorzystać je w wielu badaniach laboratoryjnych. Założono, że poprawnie zdefiniowany a następnie zidentyfikowany model, zostanie wykorzystany do analizy zjawisk dynamicznych w zazębieniach i łożyskach badanych przekładni oraz pozwoli na optymalizację ich konstrukcji, w szczególności w kierunku minimalizacji ich wibroaktywności oraz rozbudowy bazy wiedzy diagnostycznej. W pracy opisano budowę stanowiska, przedstawiono jego model dynamiczny z wyszczególnieniem uwzględnionych parametrów oraz krótką charakterystykę programu symulacyjnego i przeznaczenie jego głównych modułów. W dalszej części przedstawiono badania, mające na celu identyfikację wybranych parametrów modelu. Poprawność dostrojenia modelu została następnie zweryfikowana poprzez pomiar prędkości drgań poprzecznych wałów na stanowisku doświadczalnym z użyciem wibrometru laserowego Ometron VH300+, a wyniki badań laboratoryjnych zostały odniesione do wyników uzyskanych drogą symulacji komputerowej.
Źródło:
Diagnostyka; 2009, 4(52); 55-60
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The efficiency of detecting the failures and troubleshooting while applying technical diagnostics for multi-computer systems
Autorzy:
Ye, K. Z.
Kyaw, H. A.
Portnov, E. M.
Bain, A. M.
Vasant, P.
Powiązania:
https://bibliotekanauki.pl/articles/229469.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
technical diagnostics
fault
identification
‘AND-OR’ graph
efficiency
control devices
multi-machine power system
troubleshooting
majority principle
Opis:
This paper presents techniques which base on the concept of flows thinning together with the identification techniques. These methods are proposed to determine the expected number of failures to assess the efficiency of technical diagnostics of instruments. Additionally, this research focuses on the improvement of multi-machine troubleshooting systems, based on the ‘AND-OR’ graphs. Respective algorithms are presented. The majority principle uses the input information to check the correctness of the decision regarding identification of faulty machines. In this paper we base on the complete testing algorithm for elements of multi-computer complexes searching by criteria of failed element.
Źródło:
Archives of Control Sciences; 2015, 25, 1; 87-107
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experience in the development and operation of asynchronized turbogenerators and condensers in the Russian Power System
Autorzy:
Shakaryan, Y.
Sokur, P.
Powiązania:
https://bibliotekanauki.pl/articles/950651.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
asynchronized machine
condenser
doubly-fed machine
reactive power
vector control
Opis:
Asynchronized (doubly-fed) machines with two (three) excitating winding and reversing excitation system allow to control vector of magnetomotive force. This solution allows separating regulation of the electromagnetic torque (active power) and voltage (reactive power). This paper describes the experience in the development and operation of asynchronized turbogenerators and condensers.
Źródło:
Archives of Electrical Engineering; 2015, 64, 1; 7-15
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Knowledge base and assumptions for holistic modelling aimed at reducing axial errors of complex machine tools
Autorzy:
Jędrzejewski, J.
Kwaśny, W.
Powiązania:
https://bibliotekanauki.pl/articles/99902.pdf
Data publikacji:
2013
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
holistic model
machine tool
power losses
error
Opis:
The paper presents the idea and need for the holistic modelling of machine tools. The complexity of such modelling is illustrated for a 5-axis machining centre. The need to model errors in the controllable axes of machine tools with rotational and linear motion drives is indicated. The physical dependences having a bearing on the state of deformations produced by temperature and dynamic forces, as well as the assumptions and computational modelsof shift generation in the high-speed bearing sets of spindles, and models of the behaviour of the ball screw are presented. Moreover, the results of experimental studies of the thermal behaviour of linear motor sets and guideways with rolling blocks are reported.
Źródło:
Journal of Machine Engineering; 2013, 13, 2; 7-25
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Power and Energy Consumption for Hard Turning and Burnishing Operations of 41CR4 Steel
Autorzy:
Chudy, R.
Grzesik, W.
Powiązania:
https://bibliotekanauki.pl/articles/99749.pdf
Data publikacji:
2015
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machine tool
power consumption
hard turning
burnishing
Opis:
This paper presents a new power measurement system which allows recording the power consumption profile and determining its components related to all the controlled axes. The system is based on computer processing of signals generated by current and voltage sensors connected to spindle and axis driving electric motors. It should be noted that these motors are controlled independently with different frequencies and voltages. By using LabVIEW data acquisition system, it is possible to record total power consumption and its components during a typical machining operation. This study concerns the power consumption in a sequence machining process consisting of hard turning and ball burnishing operations under variable machining conditions.
Źródło:
Journal of Machine Engineering; 2015, 15, 4; 113-120
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy Saving Chaotic Sequence Based Encryption, Authentication and Hashing for M2M Communication of IoT Devices
Autorzy:
Kościug, Bartosz
Bilski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/27311876.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Power optimization
Security protocols
machine to machine communications
Application layer protocols
IoT
Opis:
In this paper, the secure low-power Internet of Things (IoT) transmission methods for encryption and digital signature are presented. The main goal was to develop energyefficient method to provide IoT devices with data confidentiality, integrity, and authenticity. The cryptograph energy efficient and security algorithms modifications for IoT domain were made. The novelty in our solution is the usage of encryption method popular in the image processing in the domain of the Internet of Things. Proposed modification improves immunity for the brute-force and plain-text attacks. Furthermore, we propose the modifications for hash calculation method to transform it into digital signature calculation method that is very sensitive to input parameters. The results indicate low energy consumption of both methods, however it varies significantly depending on the architecture of the devices.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 2; 253--259
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FSM state merging for low power
Autorzy:
Salauyou, V.
Powiązania:
https://bibliotekanauki.pl/articles/114448.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
finite state machine
low power
merging
internal states
Opis:
A method of finite state machine (FSM) minimization for low power by merging FSM internal states is considered. The general algorithm for the minimization of FSM power consumption by means of merging two states is presented. The algorithm of the merging possibility of two states and the actual algorithm merging of two states for incompletely specified Mealy FSMs are given. In the conclusions, the possible directions of development of this approach are specified.
Źródło:
Measurement Automation Monitoring; 2015, 61, 7; 337-339
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling ships main and auxiliary engine powers with regression-based machine learning algorithms
Autorzy:
Okumuş, Fatih
Ekmekçioğlu, Araks
Kara, Selin Soner
Powiązania:
https://bibliotekanauki.pl/articles/1573652.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
machine learning
regression
ship emissions
engine power
prediction
Opis:
Based on data from seven different ship types, this paper provides mathematical relationships that allow us to estimate the main and auxiliary engine power of new ships. With these mathematical relationships we can estimate the power of the engine based on the ship’s length (L), gross tonnage (GT) and age. We developed these approaches using simple linear regression, polynomial regression, K-nearest neighbours (KNN) regression and gradient boosting machine (GBM) regression algorithms. The relationships presented here have a practical application: during the pre-parametric design of new ships, our mathematical relationships can be used to estimate the power of the engines so that more environmentally friendly ships may be built. In addition, with the machine learning methodology, the prediction of the main engine (ME) and auxiliary engine (AE) powers used in the numerical calculation of ship-based emissions provides data for researchers working on emission calculations. We conclude that the GBM regression algorithm provides more accurate solutions to estimate the main and auxiliary engine power of a ship than other algorithms used in the study.
Źródło:
Polish Maritime Research; 2021, 1; 83-96
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear robust control for single-machine infinite-bus power systems with input saturation
Autorzy:
Wan, Y.
Powiązania:
https://bibliotekanauki.pl/articles/201145.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nonlinear robust control
input saturation
generator excitation
single-machine infinite-bus power systems
SMIB
nasycenie wejścia
wzbudzenie generatora
nieliniowe sterowanie
Opis:
In this paper, a new control scheme is proposed to achieve stability for a single-machine infinite-bus power system. A power system model simultaneously considering input saturation and time-varying uncertainties is presented. A sufficient condition for the system convergence is given and based on this result, a switching excitation control law with auxiliary system is designed. The stability analysis and simulation results all show that the developed controller is effective.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 1; 3-9
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and Implementation of Wireless Module Based on ZiGBee for Applications in Machine Tools
Autorzy:
Kasprzak, M.
Powiązania:
https://bibliotekanauki.pl/articles/100139.pdf
Data publikacji:
2015
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machine tool
wireless modules
structure
tests
ZigBee
power consumption
Opis:
This paper presents a concept of a wireless measuring system based on ZigBee modules, and the stages in its implementation. The distinctive feature of the built measuring systems is their high resistance to environmental conditions. To a large extent this was achieved through the use of induction charging. The effectiveness of this solution was determined by comparing it with conventional charging. The measuring modules built in accordance with this concept were tested in the work space of a machine tool during milling. Special attention was paid to the amount of power consumed by the tested modules during different modes of their operation. The response time of the modules during their operation in the work space of the working machine tool and in the case when the modules were completely immersed in water was tested. By comparing the measured response times the effect of the above factors on the correctness of operation of the measuring system was determined.
Źródło:
Journal of Machine Engineering; 2015, 15, 4; 133-143
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of precision of making elements for aeronautical dual - power path gear demonstrator applying venture baty coordinate measuring machine
Autorzy:
Kozik, B.
Budzik, G.
Markowski, T.
Dziubek, T.
Grzelka, M.
Powiązania:
https://bibliotekanauki.pl/articles/247833.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
analysis of precision
coordinated measuring machine
dual-power path gear
demonstrator
Opis:
The paper presents the process of measuring and analysing precision of making toothed wheels for a demonstrator of aeronautical dual-power path gear by means of FDM [2]. A coordinate measuring machine VENTURE BATY has been used in the research. The capabilities of the presented optical measuring machine make it possible to measure spur gears with different modules including small ones (m less than1)which is a great advantage of this kind of measuring equipment. Analysing precision of making elements of gears is one of more important stages in creating them [6]. However, it is necessary to remember that the controlling stage should be carried out in accordance with standards concerning measuring toothed wheels defining this activity. The measuring method presented in the paper and the outcome of measurements allowed for designing a demonstrator of dual-power path gear intended for stand tests. The correct operation of a gear is assured by proper choice of constructional parameters of cooperating wheels taking into account materials used in FDM technology. The optical machine BATY is equipped with FUSION software used while measuring and analysing precision and it allows for data processing and exchanging the data with other programming environments. It is, however, restricted by one data exchange format - DXF. With regard to 2D measurement specific character, the machine does not make it possible to control tooth outline and as a consequence, it is possible to measure only gears with straight teeth. On the other hand, the advantage of the above is the possibility of comparing the measurement to CAD-2D model, which makes it possible to analyse the precision of wheels with non-standard profiles (other than envolute ones).
Źródło:
Journal of KONES; 2012, 19, 2; 253-257
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
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