Wyniki wyszukiwania - BazTech

1

Operational control of marine catastrophes based on competitive computing technologies

Bondarev V. A., Nechaev Yu. I., Kovalishin P. Yu.

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

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2018

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Vol. 12, no. 4

701--707

EN

The paper considers the structure and functional elements of the emergency computing center that carries out operational control of sea catastrophes of vessels of the fishing fleet based on the integration of intelligent systems of new generations and high‐performance computing within the problem‐oriented dynamic environment of the virtual testing area. The real time operation of the computer center is provided by the system integration of information, algorithmic and software support based on dynamic measurement data and a structured knowledge base. The focus is on providing decision support in complex dynamic environments using modern catastrophe theory.

2

Prediction of aircraft lost of control in the flight by continuation, bifurcation, and catastrophe theory methods

Sibilski K., Kowalski M.

Journal of KONES

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2016

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Vol. 23, No. 4

451--460

EN

Lost of Control in Flight (LOC-I) is ordinarily associated with flight outside of the normal flight envelope, with nonlinear behaviours, and with an inability of the pilot to control the aircraft. These results provide a means for analysing accident data to establish whether or not the accident should be classified as LOC-I. Moreover, they help identify when the initial upset occurred, and when control was lost. The analysis also suggests which variables were involved, thereby providing clues as to the underlying mechanism of upset. However, it does not provide direct links to the flight mechanics of the aircraft, so it cannot be used proactively to identify weaknesses or limitations in the aircraft or its control systems. Moreover, it does not explain how departures from controlled flight occur. The complexity of the disaster aetiology stems from both the scale and coupling of the systems (not only the physical aircraft systems but also the organizational systems that support the operation). This complexity creates a pattern of disaster that evolves or it is precipitated through a series of several small failures. The cusp catastrophe model facilitates the mapping of Reason’s latent failure model, providing a descriptive and predictive illustration of the emergence of latent conditions under the trigger of situational factors. The risk of an accident increases as the situational and systematic factors combine to create an inherent instability resulting in the catastrophic event.

3

Struktura stanów stacjonarnych kontaktowego reaktora fluidyzacyjnego z recyklem dla procesu ciśnieniowego

Tabiś B., Siudzińska R.

Inżynieria i Aparatura Chemiczna

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2004

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Nr 2

18-21

PL

Przedstawiono wyniki badań nad wielokrotnością stanów stacjonarnych fluidyzacyjnej struktury autotermicznej składającej się z reaktora o pojedynczym złożu i pętli recyrkulacji gorących produktów. Dokonano oceny wpływu ciśnienia, współczynnika recyrkulacji oraz temperatury surowca na położenie i wielkość obszarów stanów wielokrotnych. Uwzględniono wzajemny wpływ warunków procesu i hydrodynamiki złoża fluidalnego na autotermię analizowanego obiektu. Przy tworzeniu algorytmów numerycznych wykorzystano podstawowe twierdzenia teorii katastrof. W charakterze przykładu przyjęto syntezę metanolu.

EN

The paper presents selected results concerning multiplicity of the steady states occurring in a fluidized-bed autothermal structure composed of a single-bed reactor and a circulating loop of hot products. An influence of pressure, recycle ratio and feed temperature on position and size of the steady states multiplicity was investigated. Mutual effects of operational conditions and hydrodynamics of the fluidized bed on autothermicity of the analyzed object were taken into account. When developing numerical algorithms used, basic theorems of the catastrophe theory were employed. As an example, methanol synthesis was assumed.

4

Imperfection-sensitivity analysis by using classical and catastrophe theory methods

Kurutz M., Gáspár Z.

Computer Assisted Mechanics and Engineering Sciences

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2001

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Vol. 8, No. 4

567-577

EN

Comparison of the classical methods and the tools of the catastrophe theory is presented through the imperfection-sensitivity analysis of the classical stable-symmetric bifurcation problem. Generally, classical global methods are related to a large interval, while catastrophe theory concerns the neighborhood of the critical point only, being a local method. Unfortunately, in most cases of practical problems, by using classical global methods, there can hardly be obtained analytical solutions for the multivalued imperfection-sensitivity functions and the associated highly folded imperfection-sensitivity surfaces. In this paper, an approximate solution based on the catastrophe theory is presented, in comparison with the exact solution obtained in graphical way. It will be shown that by considering the problem as an imperfect version (at a fixed imperfection) of a higher order catastrophe, a topologically good solution can be obtained in a considerably large, quasi in a nonlocal domain.