Linear and nonlinear dynamical analysis of a Crane model

Maourane, Hmoumen; Szabó, Tamás

doi:10.1556/606.2020.15.2.8

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…The Newmark method [14,15] is a commonly used implicit integration scheme, which is built in many commercial FEM software (Ansys, Abaqus, etc. ),…”

Section: Newmark Methodsmentioning

confidence: 99%

“…However, the application of it is computationally cheaper and CDM can be applied effectively when a lumped mass matrix [12] is used instead of a consistent one. Furthermore, the application of the Backward Euler (BE) [13], the NewMark (NM) [14,15] and the Hilber-Hughes-Taylor-α (HHT-α) method [16] will be studied, which are widely used backward increment schemes. The main advantage of these methods is that they are unconditionally stable.…”

Section: Introductionmentioning

confidence: 99%

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Application analysis of time stepping methods for impact problems

Serfőző

Pere

2022

Pollack

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Dynamic contact and impact problems are widely applicable. An accurate solution method for these kinds of problems can be used in many fields of mechanical engineering (e.g., cutting metalwork, cogwheel drives, etc.). However, the proper handling of the contact is problematic, as there emerges a substantial amount of nonlinearity in the displacement field. Therefore, a spurious high frequency oscillation is present in the solution. These oscillations must be avoided, as divergence can easily occur in the contact algorithm due to them. In order to eliminate this effect, the applied numerical method must be chosen and set properly. In this study, a comprehensive guide is provided for the appropriate selection of the proper numerical method and its parameters.

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“…The Newmark method [14,15] is a commonly used implicit integration scheme, which is built in many commercial FEM software (Ansys, Abaqus, etc. ),…”

Section: Newmark Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application analysis of time stepping methods for impact problems

Serfőző

Pere

2022

Pollack

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“…Az ostor hullámmozgását leíró nemlineáris dinamikai végeselemes egyenleteit jelen szerző korábbi [5] cikkében részletesen publikálta, ezért itt csak a legfontosabb megfontolásokat, összefüggéseket a cikk megismételhetőségének céljából foglaljuk össze. Az ostort ún.…”

Section: Az Ostorcsapás Hullámterjedésének Nemlineáris Modelljeunclassified

Ostorcsapás hullámterjedésének lineáris és nemlineáris számításai

Szabó

2020

MDT

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A cikk egy karikás ostor csapásának kétféle végeselemes, numerikus számításaival foglalkozik. Az első modell egy egyenletesen forgó koordinátarendszerben feszített húr lineáris hullámegyenletén alapszik. A húr előfeszítése időben állandó, de az ostor mentén a centrifugális erőhatás a felvett kerületi sebességnek megfelelően a szabadvég felé fokozatosan csökken. Az ostor kezdőpontját egy időben szinusz fél hullám szerinti elmozdulással gerjesztjük. A nemlineáris második modell az ostort síkbeli nagy elmozdulásokra képes húzott-nyomott rúdelemekkel írja le. Az ostort kezdeti sebességének előírásával és a kezdőpontjának egyenes mentén való mozgatásával gerjesztjük. Az ostor helyzeteinek legyező alakot mutató képe állítható elő. Mind a két modell alkalmas a csattanás, azaz ostorvég szuperszonikusnál nagyobb sebességének modellezésére.

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Modelling 3D dynamics of offshore lattice jib cranes by means of the rigid finite element method

Adamiec–Wójcik

Brzozowska

Drąg

et al. 2023

J. Ocean Eng. Mar. Energy

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Offshore cranes require particularly careful design due to the difficult environmental conditions in which they work. This paper presents a 3D model of the dynamics of an offshore crane with a truss jib formulated by means of the rigid finite element method. The inertial features of the truss members are assigned to nodes whose rotational and translational displacements are degrees of freedom. Flexible features of the truss members are modelled by massless and dimensionless spring–damping elements (sde). The computer programme developed on the basis of the model is verified and validated, and good correspondence of the authors’ own results with those obtained using commercial FEM package is achieved. Computer simulations are carried out for the light crane used on the wind platforms. The influence of the base movements (sea waves) on the system are also investigated. Lifting a load from a supply vessel and the load on the system during rotational movement of the crane are simulated too. Finally, conclusions concerning the influence of the movement conditions on the overload coefficient and deflections of the crane boom are formulated.

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Linear and nonlinear dynamical analysis of a Crane model

Cited by 4 publications

References 7 publications

Application analysis of time stepping methods for impact problems

Application analysis of time stepping methods for impact problems

Ostorcsapás hullámterjedésének lineáris és nemlineáris számításai

Modelling 3D dynamics of offshore lattice jib cranes by means of the rigid finite element method

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