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Wyświetlanie 1-15 z 174
Tytuł:
Load condition analysis of pipe flange connection with gasket flat gasket and loose clamping rings
Autorzy:
Wróbel, Gabriel
Walczak, Kazimierz
Powiązania:
https://bibliotekanauki.pl/articles/2105506.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
pipe
connection
clamping rings
ring stiffness
polyester-glass composites
rura
połączenie
sztywność obwodowa
kompozyty poliestrowo-szklane
Opis:
Purpose: This paper describes the study of the connection with loose fixing composite rings of pipe flanges. The elastic properties of the joint components - gasket, pressure flanges, rings and fixing bolts were determined experimentally. Design/methodology/approach: The criterion of joint tightness was formulated. The constructed model was used to determine the analytical dependence of the joint leakage pressure on the assembly torque of bolts tightening. The correctness of the model was confirmed by the agreement of the analytical results with the experimental results. Findings: Quantitative characteristics were determined for the selected type of joint. Practical implications: The formulated conclusions indicate the possibility of using the model to support the design process and to select the structural parameters of the joint meeting the operational requirements and safety criteria. Originality/value: Produced with recycled materials using.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 111, 1; 5--17
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibilities of analysis of condition and repair of common-rail system injectors
Autorzy:
Karpiuk, W.
Bor, M.
Smolec, R.
Powiązania:
https://bibliotekanauki.pl/articles/241530.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
common-rail
diagnostics
testing tables
injectors
Opis:
A wide use of common-rail injection systems in vehicles made it necessary to develop effective methods of diagnosing and repair of their subassemblies. The paper presents problems connected with diagnosing of malfunctions and regeneration of common-rail system injectors with the use of testing tables. Due to precise workmanship and strong forces, the systems are particularly exposed to damage most often caused by the application of fuels of inadequate quality. Early detection of damage symptoms may contribute to considerable decrease of costs of repair without entailing any failures of other components of the system. The authors discuss the most common methods of evaluation of the condition allowing a quick and explicit identification, whether a given injector has been damaged or not. Further deliberations lead to the determination of possible regeneration of individual generation systems of various manufacturers. The authors also present basic activities of the regeneration process and tests made with the use of testing tables. The work presents results of tests performed on a new injector with the use of testing equipment of various manufacturers. Discussion on obtained results leads to conclusions that, due to little recurrence and insufficient accuracy of measurements, possibilities of clear evaluation of technical condition of injectors is greatly limited.
Źródło:
Journal of KONES; 2016, 23, 4; 209-216
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of changes in the technical condition using discriminant analysis
Predykcja zmian stanu technicznego z wykorzystaniem analizy dyskryminacyjnej
Autorzy:
Mikołajczak, P.
Powiązania:
https://bibliotekanauki.pl/articles/328037.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
miary wzajemne
ocena wrażliwości
symptomy
analiza dyskryminacyjna
diagnostyka techniczna
mutual measures
symptoms
sensitivity analysis
discriminant analysis
technical diagnostics
Opis:
Discriminant analysis can be used for identification of variables which identify (discriminate) two or more naturally emerging groups of f.ex. diagnostic symptoms or factors influencing development of particular type of machine part use. The goal in this case is searching for rules for assignment of multidimensional objects to one of many populations of known parameters, at the lowest classification mistake level possible. The idea of discriminant analysis is definition if the groups differ on account of a mean of a variable, and using this variable for appurtenance to a group predicting (f.ex. new cases of diagnostic symptoms, factors influencing the use level). In the following paper, an example of discriminant analysis application to diagnostic parameters choosing and identification of external factors influencing intensity of rolling bearings use in rotary machines is introduced.
Analizę dyskryminacyjną stosuje się do rozstrzygania, które zmienne wyróżniają (dyskryminują) dwie lub więcej naturalnie wyłaniających się grup np. symptomów diagnostycznych lub czynników wpływających na rozwój danego rodzaju zużycia części maszyn. Stawianym celem w tym przypadku jest poszukiwanie reguł postępowania mającego na celu przyporządkowanie wielowymiarowych obiektów do jednej z wielu populacji o znanych parametrach przy możliwie minimalnych błędach klasyfikacji. Główna idea leżąca u podstaw analizy dyskryminacyjnej to rozstrzyganie, czy grupy różnią się ze względu na średnią pewnej zmiennej, a następnie wykorzystanie tej zmiennej do przewidywania przynależności do grupy (np. nowych przypadków symptomów diagnostycznych, czynników wpływających na wartość zużycia). W pracy przedstawiono przykład zastosowania analizy dyskryminacyjnej do wyboru parametrów diagnostycznych i predykcji stanu łożysk tocznych wentylatorów w zależności od czynników wymuszających zmianę tego stanu.
Źródło:
Diagnostyka; 2011, 4(60); 13-19
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Ecological Condition of Taiga Topsoil During Commercial Development
Autorzy:
Sivkov, Y.
Nikiforov, A.
Powiązania:
https://bibliotekanauki.pl/articles/123562.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
soil
pollutants
oil
industrial development
ecology
Opis:
The paper analyses the ecological properties of taiga topsoil during its commercial development and assesses the consequences of impact which will be made by the future facilities on the environment (taking into account the types of impact, their characteristics, the tendencies of transformation in the nature systems growing with the increase of service life, which were detected at the producing fields), sanitary and socioeconomic aspects of the facilities operation under the conditions of specific geographical complexes. The object of study included waspodzolic and swamp-podzolic soils located in the Uvat district in Khanty-Mansiysk Autonomous Region of Tyumen region, in the area of potential impact of industrial facilities. The method of study implied the selection of soil specimens and their examination according to the standard practices. Ten specimens were taken from each of three areas of sampling. The specimens were subjected to office study in order to determine eleven parameters. The sources of impact made by the oil and gas facility on the environment were the material objects (buildings, constructions etc.), elements and assemblies of basic and auxiliary technologies which result in pollutants emission. The major impact on topsoil at the stage of preparatory works and construction of facilities was the mechanical damage to the natural state of soils. It is primarily connected with sites stripping from forestry and ground leveling. The paper reviews the issues of ecological condition of topsoil and forecast of possible changes while commercial development of the studied area. A negative load on soil may be decreased through planning and implementation of organizational measures on assessment of current state of the topsoil within the field and environmental threat from basic and auxiliary industrial facilities.
Źródło:
Journal of Ecological Engineering; 2018, 19, 1; 163-169
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of technical condition of local roads drainage in the Czestochowa region
Autorzy:
Respondek, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/104080.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
road drainage
drainage devices
quality of road works
road maintenance
odwadnianie dróg
urządzenia odwadniające
jakość robót drogowych
utrzymanie dróg
Opis:
Local roads (district and municipal) play an important role in the road network, especially in rural areas. In recent years, these roads have been largely repaired, which was often associated with the construction of new infrastructure. One of the basic conditions of maintaining the quality of road works is the proper construction or renewal of drainage devices. Errors in this area result in lower durability of the road pavement. It is equally important to maintain these devices later in a good technical condition, which requires spending appropriate funds from local government budgets. The aim of the study presented in the article was to determine the current technical condition of drainage of local roads in the Czestochowa region and to identify the most frequent design and implementation errors, resulting in a rapid loss of functionality of drainage devices. They were based mainly on in situ studies carried out in the area of an exemplary rural municipality. Errors resulting in the lack of continuity of drainage, or the danger of a rapid loss of its functionality are shown with real examples. It was found that despite the shortcomings described, in recent years the technical condition of drainage of local roads has improved, which is related to the systematic overhaul of local roads (including the construction of sidewalks) and the local government's perception of the importance of road drainage problem.
Źródło:
Quality Production Improvement - QPI; 2019, 1, 1; 251-260
2657-8603
Pojawia się w:
Quality Production Improvement - QPI
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of technical condition assessment of gas turbine blades with non-destructive methods
Autorzy:
Błachnio, J.
Powiązania:
https://bibliotekanauki.pl/articles/387534.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
turbina gazowa
łopata
diagnozowanie
warunki techniczne
gas turbine
blade
diagnosing
technical condition
Opis:
Structural components of gas turbines, particularly the blades, sustain a variety of damages during the operation process. The most frequent cause of these damages are the overheating and thermal fatigue of the material. A primary technique to assess condition of the blades is the metallographic examination. In spite of the fact that metallographic analysis delivers much more information on the structure of examined blade material, it is a type of destructive test resulting in the destruction of the blade which makes further utilization of the item impossible. The paper has been intended to discuss non-destructive testing methods and to present capabilities of applying them to diagnose objectively changes in the microstructure of a turbine blade with computer software engaged to assist with the analyses. The following techniques are discussed: a visual method, based on the processing of images of the material surface in visible light, active thermography, based on the detection of infrared radiation, and the X-ray computed tomography. All these are new non-destructive methods of assessing technical condition of structural components of machines. They have been intensively developed at research centers worldwide, and in Poland. The computer-aided visual method of analyzing images enables diagnosis of the condition of turbine blades, without the necessity of dismantling of the turbine. On the other hand, the active thermography and the X-ray computed tomography, although more sensitive and more reliable, can both be used with the blades dismounted from the turbine. If applied in a complex way, the non-destructive methods presented in this paper, are expected to increase significantly probability of detecting changes in the blade’s condition, which in turn would be advantageous to reliability and safety of gas turbine service.
Źródło:
Acta Mechanica et Automatica; 2013, 7, 4; 203-208
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of transformers condition based on Bayes-discriminant method with fault-tree fuzzy evaluation
Autorzy:
Li, Dianyang
Wang, Shanyuan
Zhang, Yujie
Feng, Jian
Wang, Hongzhe
Qin, Ling
Powiązania:
https://bibliotekanauki.pl/articles/328004.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
oil-immersed power transformers
fault tree analysis
fuzzy-evaluation system
Bayes-discriminant
health-operation
transformator mocy
system monitorowania
analiza drzewa błędów
Opis:
China's electric power construction is renewing Increasingly, and the network is complex and changeable where the automation is getting higher. In this paper, Fuzzy evaluation system is established according to fault tree, and the estimation of transformer’s state is judged by analytic hierarchy process. Bayes-discriminant and discriminant formula are used to discriminate transformer’s attributes, which are based on historical data. The machine identification of transformer faults combines the fuzzy evaluation and Bayes-discriminant. It’s accuracy can be improved by correcting parameters. This method can effectively avoid subjective interference caused by artificial weights. The example shows that this method could be applied to judge health status of electric power equipment and this method can play an early-warning role in the operation of monitoring system.
Źródło:
Diagnostyka; 2020, 21, 2; 3-12
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibility of obtaining diagnostic information about the ships engine fuel injection system condition based on the analysis of characteristics of heat release
Autorzy:
Witkowski, Kazimierz
Powiązania:
https://bibliotekanauki.pl/articles/248068.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine diesel engine
indicated parameters
indicator diagram
heat release characteristics
injection system
diagnostic
Opis:
Marine engines are very complex technical objects, having many important functional systems, which include, inter alia, injection system, characterized by high unreliability. In this system, there may be different types of defects (damage) that affect the engine parameters, including specific fuel consumption, as well as failures endanger the safety of the ship. The indicator diagrams and analysis of indicated parameters have limited utility in the diagnosis of damages of marine engine, although this is a method commonly used in operational practice. To achieve greater diagnostic effectiveness, when, based on indicator diagrams, are calculated and then the characteristics of heat release is analysed - net of heat release characteristics and the intensity of the heat release, it was demonstrated. This procedure is particularly effective in the diagnosis of damages of marine diesel engine injection system components. It has been shown that the characteristics of heat release contain information about the condition of the injection systems, which enable to diagnose their failures. This is shown on the example of a clogged nozzle holes (their carbonizations). The obtained results allowed selecting the diagnosis symptoms, useful in detecting these faults in the injection system, from the characteristics of heat release: net heat release (Q) and intensity of heat release (q). The object of the research was typical marine medium speed engine Sulzer A25/30.
Źródło:
Journal of KONES; 2019, 26, 3; 249-256
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of convective heat and mass conditions in MHD flow of nanofluid
Autorzy:
Shehzad, S. A.
Hayat, T.
Alsaedi, A.
Powiązania:
https://bibliotekanauki.pl/articles/201220.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nanofluid
MHD flow
convective mass condition
nonlinear analysis
HAM
przepływ MHD
analiza nieliniowa
Opis:
This article aims to investigate the two-dimensional magnetohydrodynamic (MHD) boundary layer flow of nanofluid. Convective mass condition is introduced. Analysis has been discussed in the presence of an applied magnetic field. The Brownian motion and thermophoresis effects are incorporated. The arising nonlinear problems are first converted to ordinary differential equations and then series solutions are constructed. Convergence of series solutions is examined through plots and numerical values. Results are plotted and discussed for the temperature and concentration. Numerical computations for skin-friction coefficient, local Nusselt and Sherwood numbers are performed and analyzed. Comparison with the previous limiting case is noted in an excellent agreement.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 465-474
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wind turbine generator slip ring damage detection through temperature data analysis
Autorzy:
Astolfi, Davide
Castellani, Francesco
Natili, Francesco
Powiązania:
https://bibliotekanauki.pl/articles/329616.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
wind energy
wind turbines
fault diagnosis
condition monitoring
principal components regression
energetyka wiatrowa
turbina wiatrowa
diagnostyka uszkodzeń
monitorowanie stanu
Opis:
The use of condition monitoring techniques in wind energy has been recently growing and the average unavailability time of an operating wind turbine in an industrial wind farm is estimated to be less than the 3%. The most powerful approach for gearbox condition monitoring is vibration analysis, but it should be noticed as well that the collected data are complex to analyse and interpret and that the measurement equipment is costly. For these reasons, several wind turbine subcomponents are monitored through temperature sensors. It is therefore valuable developing analysis techniques for this kind of data, with the aim of detecting incoming faults as early as possible. On these grounds, the present work is devoted to a test case study of wind turbine generator slip ring damage detection. A principal component regression is adopted, targeting the temperature collected at the slip ring. Using also the data collected at the nearby wind turbines in the farm, it is possible to identify the incoming fault approximately one day before it occurs.
Źródło:
Diagnostyka; 2019, 20, 3; 3-9
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A PATTERNS OF MASCULINITIES IN DISCOURSE OF REPORTS ASSESSING CONDITION OF POLISH STARTUPS ORGANISATIONS
Autorzy:
TOBIASIEWICZ, EDYTA
Powiązania:
https://bibliotekanauki.pl/articles/1036062.pdf
Data publikacji:
2021-03-08
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
masculinity
masculinities
startups
gender
innovation
discourse analysis
integrative theories of gender
Opis:
The purpose of this article is discourse analysis of masculinity created in reports assessing the current condition of Polish startups. The analysis covered reports published by the Startup Poland foundation from 2015-2019. This text is an attempt to apply the heuristic framework of integrative gender theories to interpret the results of the research, and explain how the discursively masculinity was constructed. Startups as innovative professional structures belonging to the knowledge-based economy model are an example of organizations typical of the information society. Numerous studies report changes (crises) occurring among the practiced male patterns (especially those typical for the countries of the global North). The results of the analysis show that despite these reports, the largest startup organizations striving to produce innovative solutions and using modern solutions, on the discursive surface, are associated with cultural patterns of hegemonic masculinity. Polish startups, on a structural and symbolic dimensions, are a highly masculine spaces. However, due to the practice of achieving hegemony, they (startups) can be interpreted in terms of cooperative or hybrid masculinity.
Źródło:
Society Register; 2021, 5, 1; 95-116
2544-5502
Pojawia się w:
Society Register
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Condition monitoring of wind turbines based on cointegration analysis of gearbox and generator temperature data
Diagnostyka turbiny wiatrowej w oparciu o analizę kointegracji sygnałów temperatury z przekładni oraz generatora
Autorzy:
Dao, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/329322.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
wind turbine
varying environmental conditions
operational conditions
condition monitoring
fault detection
cointegration
SCADA system
turbina wiatrowa
zmienne warunki środowiskowe
zmienne warunki eksploatacyjne
monitorowanie stanu
wykrywanie uszkodzeń
kointegracja
system SCADA
Opis:
This paper presents a cointegration-based method for condition monitoring of wind turbines. Analysis of cointegration residuals - obtained from cointegration process of wind turbine data - is used for operational condition monitoring and fault detection. The method has been employed for on-line condition monitoring of a wind turbine drivetrain with a nominal power of 2 MW under varying environmental and operational conditions using only the temperature data of gearbox bearing and generator winding, which were collected by the Supervisory Control and Data Acquisition (SCADA) system. The results show that the proposed method can effectively monitor the wind turbine and reliably detect the gearbox fault.
Artykuł przedstawia metodę kointegracji sygnałów do monitorowania stanu turbiny wiatrowej. Analiza wektorów resztkowych kointegracji wykorzystana została do monitorowania stanu turbiny wiatrowej o mocy nominalnej 2 MW. Diagnostykę turbiny wiatrowej przeprowadzono dla zmiennych warunków środowiskowych i eksploatacyjnych, tylko w oparciu o sygnały temperatury łożyska przekładni i uzwojenia generatora. Sygnały te zostały zgromadzone przez system sterowania, monitorowania oraz wizualizacji SCADA. Wyniki pokazują, że proponowana metoda może skutecznie monitorować turbinę wiatrową i niezawodnie wykryć uszkodzenie przekładni.
Źródło:
Diagnostyka; 2018, 19, 1; 63-71
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the possibilities of using EEG in assessing pilots’ psychophysical condition
Autorzy:
Galant, M.
Merkisz, J.
Powiązania:
https://bibliotekanauki.pl/articles/197556.pdf
Data publikacji:
2017
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
EEG
simulator
pilot
psychophysical condition
symulator
stan psychofizyczny
Opis:
An excessive load on an operator’s cognitive system can cause deterioration in perceptual abilities, decreased reaction time and increased probability of making an incorrect decision, which in turn can lead to a dangerous situation. Researching the cognitive load of an operator can therefore contribute to safer transportation. While there are many methods used in the study of cognitive load, they can be classified as either subjective assessments or objective assessments. This paper presents an analysis of the possibilities of using electroencephalography in assessing the psychophysical condition of the pilot. The investigation was conducted in the Simulation Research Laboratory in the Institute of Combustion Engines and Transport at Poznan University of Technology.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2017, 95; 39-46
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Crack Propagation Analysis of the Compressor Blades Working in High Cycle Fatigue Condition
Autorzy:
Witek, L.
Powiązania:
https://bibliotekanauki.pl/articles/97871.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
compressor blade
failure analysis
crack propagation
vibration
FEM
Opis:
This paper presents results of experimental vibration tests of the helicopter turbo-engine compressor blades. The blades used in investigation were retired from maintenance under technical inspection of engine. Investigations were conducted for selected undamaged blades, without existence of preliminary cracks or corrosion pits. The blades during experiment were entered into transverse vibration. The crack propagation process was conducted in resonance condition. During the fatigue test, the growth of crack was monitored. In the second part of work, a nonlinear finite element method was utilized to determine the stress state of the blade during vibration. In this analysis a first mode of transverse vibration were considered. High maximum principal stress zone was found at the region of blade where the crack occurred.
Źródło:
Fatigue of Aircraft Structures; 2009, 1; 195-204
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
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