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The dynamic response of a continuous plate for different surface states

Guebailia M., Ouelaa N.

Diagnostyka

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2017

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Vol. 18, No. 4

11--17

EN

Several dynamic effects can be generated and simply observed by the passage of an external mobile exciter forces with different speeds on the surface of an orthotropic continuous plate. In the present paper one illustrates the dynamic behaviour of a thin, orthotropic, multi-span plate, subjected to the passage of moving exciters. In this model, the roughness of the surface of the plate is considered as the contact surface between mobile exciter and the plate. The modal and Newmark integration methods are used in order to solve the coupled plate–exciter equations of motion. One presents especially results which show clearly the influence of the surface states on the dynamic behaviour of the plate and also the generated interaction forces due to the surface roughness. In this paper one presents also the influence of the mobile exciter speeds on the plate dynamic response.

2

Multi-grid model for crowd’s evacuation in ships based on cellular automata

Chen M., Han D.

Polish Maritime Research

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2015

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S 1

75--81

EN

In order to enhance the authenticity and accuracy simulation of passengers’ evacuation in ships, a new multi-grid model is proposed on the basis of cellular automata theory. By finer lattice the multi-grid model could enhance the continuity of passengers’ track and the precision of boundary’s qualification compared with traditional cellular automata model. Attraction, repulsion and friction are also quantized in the multi-grid model to present the impact of interaction force among pedestrians. Furthermore, crowd’s evacuation simulated by traditional cellular automata and multi-grid model in single exit room and typical cabin environment have been taken as examples to analyze crowd’s motion laws. It is found that the laws of passengers’ evacuation simulated by the two models are similar, and the simulation authenticity and accuracy is enhanced by the multi-grid model.

3

Ocena wpływu wybranych cech geometrycznych korzenia na wartości sił oddziaływania w układzie narzędzie-burak-gleba

Gołacki K., Kołodziej P.

Inżynieria Rolnicza

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2005

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R. 9, nr 6

189--196

PL

Badania eksperymentalne wykonano przy użyciu specjalnych stanowisk do pomiaru siły reakcji korzenia podczas wyorywania oraz siły potrzebnej do wyciągnięcia korzenia z gleby. Stwierdzono korelacje pomiędzy siłą wyciągania korzeni a cechami korzenia jak: długość maksymalna buraka oraz masa buraka wraz z przywierającą do powierzchni warstwą gleby. Istotny wpływ miały także zmienne pośrednie: długość korzenia w glebie, współczynnik kształtu oraz wierzchołkowy kąt stożka korzenia. Stwierdzono także zależność pomiędzy poziomą siłą reakcji korzenia a masą buraka po oczyszczeniu z przywierającej warstwy gleby.

EN

Special stands were used to carry out experiments of measuring a reaction force of a root while pulling it out of the soil. Investigations proved the correlation between the pulling-out-force and the following features of the root: maximum length, mass together with layer of the soil sticking to the root. The pulling - out - force is also significantly influenced by the root length in the soil, shape coefficient and the apex angle of the root cone. Horizontal reaction force of the root depends on the sugar beet mass after clearing the root of the soil.