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1
Content available Modeling impact resistance of the ships hull
Grządziela A., Jurczak W.
Zeszyty Naukowe Akademii Morskiej w Szczecinie
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2015
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nr 41 (113)
61--64
EN
Ships’ hull usually works in a hard environment caused by static forces and permanent dynamic loads. Modeling of dynamical reactions could bring information to the designer for recognizing the level of hazard for hull structure and propulsion system. A paper presents a proposal of identification of a degree of hazard the ships hull forced from underwater explosion. A theoretical analysis was made of influence of changes of hull structure in vicinity of shaft bearing foundations. The main problem of naval vessels is a lack of dynamical requirements of stiffness of the hull. Modelled signals and hull structure were recognized within sensitive symptoms of three sub models: model of hull structure, model of impact and model of propulsion system. All sub models allow testing forces and their responses in vibration spectrum using SIMULINK software.
2
Model of impact underwater detonation
Grządziela A.
Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska
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2012
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z. 3/89
29--34
EN
Ships’ hull usually works in a hard environment caused by static forces and permanent dynamic loads. Modelling of dynamical reactions could bring information to the designer for recognizing the level of hazard for hull structure and propulsion system. A paper presents a proposal of identification of a degree of hazard the ship’s hull forced from underwater explosion. A theoretical analysis was made of influence of changes of hull structure in vicinity of shaft bearing foundations. Modelled signals and hull structure were recognized within sensitive symptoms of three sub models: model of hull structure, model of impact and model of propulsion system.
PL
W artykule zaprezentowano wyniki analizy i modelowania kadłuba odpornego na detonacje podwodne. Przeprowadzone badania ukierunkowano na określenie wpływu detonacji na strukturę okrętowej linii wałów. Podstawowym problemem sygnalizowanym w artykule jest zachowanie sztywności kadłuba poddanego detonacji. Badania obejmują modelowanie struktury kadłuba, modelowanie oddziaływania detonacji podwodnej oraz modelowanie elementów układu napędowego. Wszystkie modele są ze sobą powiązane a uzyskane wyniki są efektem zastosowanie narzędzi modelowych SIMULINK.
3
Content available Effects Of Underwater Explosion On Minehunters Shafts Lines
Grządziela A.
Journal of Polish CIMAC
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2008
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Vol. 3, no 2
9-13
EN
Ships’ propulsion plant usually works in a hard environment caused by static forces and permanent dynamic loads. Exciding of tolerated values of shaft alignments causes a damage of radial and thrust bearings in relative short time. Modeling of dynamical reactions could bring information to the designer for recognizing the level of hazard for propulsion system. A paper presents a proposal of identification of a degree of hazard to ship shaft line due to forces of underwater explosion. A theoretical analysis was made of influence of changes in co-axiality of shafts resulting from elastic deformations of hull structure in vicinity of shaft bearing foundations. The main problem of naval vessels is a lack of dynamical requirements of stiffness of the hull. Modelled signals were recognized within sensitive symptoms of two sub models: model of propulsion system and model of shafts misalignment. Both sub models allow testing forces and their responses in vibration spectrum using SIMULINK software.
4
Content available Dynamics of minehunters shafts lines
Grządziela A.
Diagnostyka
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2008
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nr 1(45)
25-30
EN
Ships' propulsion plant usually works in a hard environment caused by static forces and permanent dynamic loads. Exciding of tolerated values of shaft alignments causes a damage of radial and thrust bearings in relative short time. Modeling of dynamical reactions could bring information to the designer for recognizing the level of hazard for propulsion system. A paper presents a proposal of identification of a degree of hazard to ship shaft line due to forces of shafts misalignment. A theoretical analysis was made of influence of changes in co-axiality of shafts resulting from elastic deformations of hull structure in vicinity of shaft bearing foundations. The main problem of naval vessels is a lack of dynamical requirements of stiffness of the hull. Modelled signals were recognized within sensitive symptoms of two sub models: model of propulsion system and model of shafts misalignment. Both sub models allow testing forces and their responses in vibration spectrum using SIMULINK software.
PL
Jednym z podstawowych problemów w konstrukcji okrętów jest brak precyzyjnych wymagań w zakresie sztywności kadłuba. Oddziaływania dynamiczne mogą powodować elastyczne odkształcenia, które oddziaływają na łożyska linii wałów. Referat prezentuje propozycję identyfikacji zagrożeń dla linii wałów okrętowych wynikających z przekroczenia parametrów współosiowości. Przedstawiono analizy teoretyczne dynamiki wału śrubowego z uwzględnieniem zagadnienia przesunięcia osi wału wynikającego z obciążeń dynamicznych kadłuba. Modelowanie reakcji dynamicznych może umożliwić budowę bazy danych dla potrzeb systemu monitoringu. Przedstawione modele wykonane w środowisku SIMULINK pozwalają testować reakcje dynamiczne spotykane w rzeczywistych warunkach eksploatacji okrętu.
5
Content available An analysis of possible assessment of hazards to ship shaft line, resulting from impulse load
Grządziela A.
Polish Maritime Research
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2007
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nr 3
12-20
EN
This paper presents a proposal of identification of a degree of hazard to ship shaft line due to impulse load caused by underwater explosion. A theoretical analysis was made of influence of changes in co-axiality of shafts on second-kind critical velocities resulting from elastic deformations of hull structure in vicinity of shaft bearing foundations. Results are presented of pilotage tests of underwater explosion performed on training water area. A preliminary mathematical model of underwater explosion is given with taking into account mass of explosives and distance from the tested object. The drawn conclusions show a way of identification of hazard to shaft line by using spectral analysis and time - runs of vibration signals recorded at shaft bearings.
6
Content available Dynamic problems of propulsion system of naval vessels
Grządziela A.
Journal of KONES
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2007
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Vol. 14, No. 3
195-202
EN
Ship propulsion systems are subjected to specific sea loads due to waving and dynamical impacts associated with mission of a given ship. Sea waving can be sufficiently exactly modelled by means of statistical methods. Knowledge of a character of impulse loading which affects ship shaft line can makes possible identifying potential failures by means of on-line vibration measuring systems. The modelling of impulse impact form and next its identification makes possible identification of explosion power, distance from explosion epicentre, a kind of explosion, elastic or plastic deformation of shaft line. The presented results related to the performed experimental test do not make possible assigning unambiguously the modelled signal features to those of the recorded ones during the real test. Analysis of forces acting on shaft-line bearings, problems of underwater explosion, and models of excitation due to underwater explosion has been described in the paper. In particularly simulated static bending stresses in propeller shaft due to weight of propeller, a simplified shaft-line model for critical speed calculation, run of changes of shock wave pressure and ship hull acceleration measured on hull surface during underwater explosion, schematic diagram of the performed experimental test, run of the assumed vibration acceleration model, spectrum of the assumed vibration acceleration model are represented.
7
Content available Dynamic problems of shaftlines
Grządziela A.
Diagnostyka
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2007
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nr 4(44)
5-10
EN
Ships' propulsion plant usually works in a hard environment caused by static forces and permanent dynamic loads. Elastic strains from machine vibration can cause resonance of plastic strain of shell plating and foundation of shafting elements. Exciding of tolerated values of shaft alignments causes a damage of radial and thrust bearings in relative short time. The alignment deviations in the construction of ships propulsion shaft line has been an effect of tensile forces, compressive forces, bending moments and transverse vibration from disturbances of rotation movement. Modeling of dynamical reactions could brings information to the project data base for recognizing the level of hazard for propulsion system of the naval vessels. Recorded signals were recognized within sensitive symptoms of two models: model of propulsion system and model of underwater explosion.
PL
W artykule przedstawiono propozycję identyfikacji stopnia zagrożenia od obciążenia impulsowego wywołanego przez wybuch podwodny na okrętową linię wałów. Dokonano analizy teoretycznej wpływu zmian współosiowości wałów na prędkości krytyczne drugiego rodzaju wynikające z odkształceń sprężystych kadłuba w rejonie fundamentów łożysk nośnych. Przedstawiono wyniki pilotażowych badań na poligonie morskim z wykorzystaniem eksplozji podwodnej. Zaproponowano wstępny model matematyczny opisu eksplozji podwodnej uwzględniający masę ładunku oraz odległość od obiektu. We wnioskach przedstawiono sposób identyfikacji zagrożenia dla linii wałów przy wykorzystaniu analizy widmowej przebiegów czasowych sygnałów drganiowych rejestrowanych na łożyskach nośnych.
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