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1
Content available Modelling of vibrations of a liquid filled tank
Trębacki K.
Polish Maritime Research
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2008
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nr 3
18-27
EN
Kinematic excitations provoke the motion and vibrations of the construction, which in turn considerably affects hydrodynamic loads generated on the walls of liquid cargo tanks. The issues of hydrodynamics also refer to the constructions fixed to the bottom, and those half-immersed, fully immersed, and floating (drilling platforms). They mainly concern ship tanks and oceanotechnical tanks. The theoretical and numerical analysis for long an short tanks, fully or partially filled with liquid has been performed. The determined hydrodynamic loads directly refer to the strength of the tank structure, which provides opportunities for determining the constructional strength of the entire hull. Extremely severe requirements are to be met by tanks used for carrying radioactive liquids, as an extremely high safety level is to be secured on all cargo carriers used in marine and land transport.
2
Content available Experimental research on hydroelastic behaviour of a tank model subdivided into liquid-filled compartments
Trębacki K.
Polish Maritime Research
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2008
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nr 4
17-20
EN
The research was performed with the use of plexiglass models subdivided into 12 separate compartments. The compartments can be filled with a liquid. The model was excited to vibrations within a given frequency band by means of an exciter and accelerations were measured in selected points of the model. During measurement series oscillograms were obtained for various filling states at continuously changing range of measured frequencies. The oscillograms obtained for free vibrations measured on liquid-filled tank models were then processed. Results of the model tests were compared with those theoretically calculated for simple cases of tank-liquid system. The simple cases were used to test correctness of the elaborated computational program for determining hydrodynamic loads applied to tank walls. The application program for determining hydrodynamic internal loads was elaborated. Also, the influence of liquid filling state on values of loading, accelerations and wall deformations was demonstrated.
3
Content available remote Recent developments in the field of ship hydrodynamics at ihe Ship Laboratory of Helsinki University of Technology
Matusiak J., Mikkola T.
Archives of Civil and Mechanical Engineering
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2008
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Vol. 8, no 1
61-70
EN
Some recent developments in the fields of ship hydrodynamics, stability and hydroelasticity at the ship laboratory of Helsinki University of Technology are briefly described.
PL
W referacie pokrótce opisano najnowsze prace badawcze z dziedziny hydrodynamiki okrętu, stateczności i hydro sprężystości prowadzone w laboratorium okrętowym w Helsinki University of Technology.
4
Content available remote Experimental investigations of the hydroelasticity of a liquid-filled tank
Trębacki K.
Archive of Mechanical Engineering
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2008
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Vol. LV, nr 2
103-127
EN
The article presents the results of experimental investigations of interactions between a deformable structure and a liquid. The investigations were performed on two prismatic tanks with elastically deformable top walls. During the investigations, different levels of tank filling with liquid were examined. The investigation of this phenomenon has direct reference to frequently recorded real events, such as collision of a tanker with another ship or a harbour berth, rapid braking of a road or rail tanker, etc. Recognition of this phenomenon is based on simultaneous measurements of the following parameters: 1. excited accelerations of the tank-liquid system, 2. elastic accelerations of top walls of the tank, 3. hydrodynamic pressures on the deformable top walls.
PL
W artykule przedstawiono wyniki badań eksperymentalnych dotyczących współoddziaływania konstrukcji odkształcalnej z cieczą. Badania przeprowadzono na dwóch zbiornikach prostopadłościennych ze sprężyście odkształcalnymi ścianami szczytowymi. Stosowano różne stopnie napełnienia zbiorników cieczą. Badanie tego zjawiska ma odniesienie do często spotykanych zdarzeń praktycznych jak zderzenie zbiornikowca z innym statkiem lub nabrzeżem portowym. Gwałtowne hamowanie cystern samochodowych lub kolejowych itp. Rozpoznanie zjawiska doprowadziło do jednoczesnych pomiarów następujących wielkości: 1. Wymuszanych przyspieszeń układu zbiornik-ciecz 2. Przyspieszeń sprężystych ścian szczytowych zbiornika 3. Ciśnień hydrodynamicznych odkształcalnych ścian szczytowych
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