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1
Content available Assessment of the Simultaneous Influence of Yarn Linear Mass and the Real/Service Loading Cycle on the Fatigue Life of Smooth and Flame Cotton Yarns
Drobina Robert, Rysiński Jacek
Fibres & Textiles in Eastern Europe
|
2020
|
Vol. 28, no. 2 (140)
21--28
EN
In the paper, the results of fatigue investigations on smooth and flame yarns are presented. The investigations were performed for yarns of the following types 25, 30, 40 and 50 tex, i.e. for thin yarns as well as for relatively thick ones made in spinning mills. An assessment of fatigue life was made based upon statistically analysed Wöhler curves. Aiming for a more complex presentation of changes over time taking place due to variable loading, we performed an assessment of the simultaneous influence of linear mass changes for smooth and flame cotton yarns as well as coefficients of the real loading cycle on the fatigue life of adequate yarns (represented by the number of loading/fatigue cycles). A statistical approach to the identification of characteristics of fatigue life was utilised. Experimental data were approximated via linear-square polynomials. Additionally, factor analysis was performed, which has not been considered till now, in relation to the fatigue phenomena modelling. Due to the wide and comprehensive plan of experiments as well as the number of trails and specimens utilised, such investigations are rarely described in references. Within the framework of the experiment program, a consecutive series of planned tests: 4 x 8 based upon 32 variants for 20 tests were taken into consideration for smooth yarns of every variant as well as an adequate number of tests performed separately for cotton flame yarns. This allowed us to make versatile statistical analyses and reliable identification of needed quantities and parameters. Utilisation of a pre-designed (planned) experiment allows for assessment of the average behaviour of a product in a real technological process, while methods considering characteristics in dependence on one variable are too simple for showing the ongoing changes. They could not fully represent the behaviour of an artifact/product in service conditions.
PL
W artykule przedstawiono wyniki badań zmęczeniowych przędz Smooth i Flame. Badania przeprowadzono dla przędz następujących typów 25, 30, 40 i 50 tex, tj. dla cienkich przędz oraz stosunkowo grubych wykonanych w przędzalniach. Ocenę trwałości zmęczeniowej przeprowadzono na podstawie analizowanych statystycznie krzywych Wöhlera. Dążąc do bardziej złożonej prezentacji zmian zachodzących w czasie w wyniku zmiennego obciążenia, przeprowadziliśmy ocenę równoczesnego wpływu zmian masy liniowej dla bawełnianych przędz Smooth i Flame, a także współczynników rzeczywistego cyklu obciążania na żywotność zmęczeniową odpowiednich przędz (reprezentowane przez liczbę cykli obciążenia/zmęczenia). Zastosowano statystyczne podejście do identyfikacji charakterystyk trwałości zmęczeniowej. Dane eksperymentalne aproksymowano za pomocą wielomianów liniowo-kwadratowych. Dodatkowo przeprowadzono analizę czynnikową, której dotychczas nie rozważano, w odniesieniu do modelowania zjawisk zmęczeniowych. Ze względu na szeroki i kompleksowy plan eksperymentów, a także liczbę wykorzystanych szlaków i okazów, takie badania są rzadko opisywane w odnośnikach. W ramach programu eksperymentu wzięto pod uwagę kolejną serię planowanych testów: 4 x 8 w oparciu o 32 warianty dla 20 testów dla gładkich przędz każdego wariantu, a także odpowiednią liczbę testów wykonanych osobno dla przędz bawełnianych. To pozwoliło nam na wykonanie wszechstronnych analiz statystycznych i niezawodną identyfikację potrzebnych ilości i parametrów. Wykorzystanie wcześniej zaprojektowanego (planowanego) eksperymentu pozwala na ocenę średniego zachowania produktu w prawdziwym procesie technologicznym, podczas gdy metody uwzględniające cechy zależne od jednej zmiennej są zbyt proste do pokazania zachodzących zmian. Nie mogły w pełni przedstawić zachowania artefaktu/produktu w warunkach użytkowania.
2
Content available Modelling, identification and prediction of oil spill domains at port and sea water areas
Dąbrowska Ewa, Kołowrocki Krzysztof
Journal of Polish Safety and Reliability Association
|
2019
|
Vol. 10, No. 1
43--58
EN
Methods of oil spill domains determination are reviewed and a new method based on a probabilistic approach to the solution of this problem is recommended. A semi-Markov model of the process of changing hydro-meteorological conditions is constructed. To describe the oil spill domain central point position a two-dimensional stochastic process is used. Parametric equations of oil spill domain central point drift trend curve for different kinds of hydro-meteorological conditions are determined. The general model of oil spill domain determination for various hydro-meteorological conditions is proposed. Moreover, statistical methods of this general model unknown parameters estimation are proposed. These methods are presented in the form of algorithms giving successive steps which should be done to evaluate these unknown model parameters on the base of statistical data coming from experiments performed at the sea. Moreover, approximate expected stochastic prediction and Monte Carlo Simulation in real time prediction of the oil spill domain movement are proposed.
3
Content available Computer-aided identification of complex technical systems operation processes
Blokus-Roszkowska A., Guze S., Kołowrocki K., Soszyńska-Budny J.
Journal of Polish Safety and Reliability Association
|
2011
|
Vol. 2, No. 2
235--240
EN
In the paper, the procedures of the identification of complex technical system operation process and identifying the distributions of the system conditional sojourn times in the operation states are described. Furthermore, the computer program for identification of the operations processes capabilities with description are presented. As the application of this computer program, the identification of the ferry technical system operation process is shown.
4
Content available Identification of complex technical systems operation processes
Soszyńska J., Kołowrocki K., Blokus-Roszkowska A., Guze S.
Journal of Polish Safety and Reliability Association
|
2010
|
Vol. 1, No. 2
287--308
EN
There is presented the contents of the training course addressed to industry. The curriculum of the course includes the methods, algorithms and procedures for identification of the unknown parameters of the operations processes of the complex technical systems and their application in practice. It is based on theoretical backgrounds concerned with the semi-markov modelling of the complex technical systems operations processes, the statistical methods of identification of the complex technical systems operation processes. The illustrations of the proposed methods and procedures practical application in port, shipyard and maritime transport sector are included.
5
Content available Identification of complex technical systems operation processes (part 2)
Soszyńska J., Kołowrocki K., Blokus-Roszkowska A., Guze S.
Journal of Polish Safety and Reliability Association
|
2010
|
Vol. 1, No. 2
309--328
EN
There is presented the contents of the training course addressed to industry. The curriculum of the course includes the methods, algorithms and procedures for identification of the unknown parameters of the operations processes of the complex technical systems and their application in practice. It is based on theoretical backgrounds concerned with the semi-markov modelling of the complex technical systems operations processes, the statistical methods of identification of the complex technical systems operation processes. The illustrations of the proposed methods and procedures practical application in port, shipyard and maritime transport sector are included.
6
Content available Identification of complex technical system components safety models (part 3)
Soszyńska J., Kołowrocki K., Blokus-Roszkowska A., Guze S.
Journal of Polish Safety and Reliability Association
|
2010
|
Vol. 1, No. 2
469--484
EN
There is presented the contents of the training course addressed to industry. The curriculum of the course includes the methods, algorithms and procedures for identification of the safety models of components of the complex technical systems and their applications in practice. It is based on the theoretical backgrounds concerned with the semi-markov modeling of the complex technical systems operation processes, on the complex technical systems and their components multistate safety models and on the statistical methods of identification of the complex technical system components safety models. The illustration of the proposed methods and procedures practical application in maritime transportation is included.
7
Content available Identification of complex technical system components safety models (part 4)
Soszyńska J., Kołowrocki K., Blokus-Roszkowska A., Guze S.
Journal of Polish Safety and Reliability Association
|
2010
|
Vol. 1, No. 2
485--496
EN
There is presented the contents of the training course addressed to industry. The curriculum of the course includes the methods, algorithms and procedures for identification of the safety models of components of the complex technical systems and their applications in practice. It is based on the theoretical backgrounds concerned with the semi-markov modeling of the complex technical systems operation processes, on the complex technical systems and their components multistate safety models and on the statistical methods of identification of the complex technical system components safety models. The illustration of the proposed methods and procedures practical application in maritime transportation is included.
8
Content available Identification of complex technical system components safety models (part 2)
Soszyńska J., Kołowrocki K., Blokus-Roszkowska A., Guze S.
Journal of Polish Safety and Reliability Association
|
2010
|
Vol. 1, No. 2
437--468
EN
There is presented the contents of the training course addressed to industry. The curriculum of the course includes the methods, algorithms and procedures for identification of the safety models of components of the complex technical systems and their applications in practice. It is based on the theoretical backgrounds concerned with the semi-markov modeling of the complex technical systems operation processes, on the complex technical systems and their components multistate safety models and on the statistical methods of identification of the complex technical system components safety models. The illustration of the proposed methods and procedures practical application in maritime transportation is included.
9
Content available Identification of complex technical system components safety models
Soszyńska J., Kołowrocki K., Blokus-Roszkowska A., Guze S.
Journal of Polish Safety and Reliability Association
|
2010
|
Vol. 1, No. 2
399--436
EN
There is presented the contents of the training course addressed to industry. The curriculum of the course includes the methods, algorithms and procedures for identification of the safety models of components of the complex technical systems and their applications in practice. It is based on the theoretical backgrounds concerned with the semi-markov modeling of the complex technical systems operation processes, on the complex technical systems and their components multistate safety models and on the statistical methods of identification of the complex technical system components safety models. The illustration of the proposed methods and procedures practical application in maritime transportation is included.
10
Content available Identification of complex technical system components reliability models
Soszyńska J., Kołowrocki K., Blokus-Roszkowska A., Guze S.
Journal of Polish Safety and Reliability Association
|
2010
|
Vol. 1, No. 2
343--368
EN
There is presented the contents of the training course addressed to industry. The curriculum of the course includes the methods, algorithms and procedures for identification of the reliability models of components of the complex technical systems and their applications in practice. It is based on the theoretical backgrounds concerned with the semi-markov modeling of the complex technical systems operation processes, on the complex technical systems and their components multistate reliability models and on the statistical methods of identification of the complex technical system components reliability models. The illustrations of the proposed methods and procedures practical application in port and shipyard transportation are included.
11
Content available Identification of complex technical system components reliability models (part 2)
Soszyńska J., Kołowrocki K., Blokus-Roszkowska A., Guze S.
Journal of Polish Safety and Reliability Association
|
2010
|
Vol. 1, No. 2
369--398
EN
There is presented the contents of the training course addressed to industry. The curriculum of the course includes the methods, algorithms and procedures for identification of the reliability models of components of the complex technical systems and their applications in practice. It is based on the theoretical backgrounds concerned with the semi-markov modeling of the complex technical systems operation processes, on the complex technical systems and their components multistate reliability models and on the statistical methods of identification of the complex technical system components reliability models. The illustrations of the proposed methods and procedures practical application in port and shipyard transportation are included.
12
Content available remote On the statistical analysis of data for the water usage network design
Shakhnovsky A.
Chemical and Process Engineering
|
2007
|
Vol. 28, z. 3
493-503
EN
The paper addresses some aspects of application of statistical analysis to the study of initial data collected at the plant for calculating water network. The methods of processing of the data (for their systematization, study of their reliability, coordination and experimental statistical identification of the models) are presented.
PL
Przedstawiono wybrane aspekty zastosowania analizy statystycznej do badania danych z instalacji zebranych do projektowania przemysłowych sieci wody procesowej. Przedstawiono metody przetwarzania danych służące do ich systematyzacji, badania poziomu ufności, korelacji i statystycznej identyfikacji.
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