Elevation Cable Modeling for Interactive Simulation of Cranes
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García-Fernández, Ignacio; Pla i Castells, Marta; Martínez Durá, Rafael J.
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Aquest document és un/a Comunicació/Ponència, creat/da en: 2008
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In this paper, the way to simulate hoisting cables in real time is addressed. We overcome instability in such
simulation by considering a two-layered model: a model for the dynamics of a cable passing through a set of
pulleys and an oscillation model based on the classical one-dimensional wave equation. The first layer considers
the interaction between the cable and pulleys with the elevation equipment, while the second layer simulates cable
oscillation. Numerical instability is avoided by suspending the oscillation layer when required. Due to the system
properties, this can be carried out in such a way that does not cause significant loss in the system quality. It
considers the oscillation of the cable between every pair of pulleys, collision detection and the variation of the
cable length very efficiently. Rendering issues are discussed, with remarks on how to prevent aliasing artifacts
in the cable. Efficiency is analyzed, including performance tests which show that the model can be run very
efficiently. The paper also covers how to integrate the model in a complex multibody simulation with a high degree
of interactivity.In this paper, the way to simulate hoisting cables in real time is addressed. We overcome instability in such
simulation by considering a two-layered model: a model for the dynamics of a cable passing through a set of
pulleys and an oscillation model based on the classical one-dimensional wave equation. The first layer considers
the interaction between the cable and pulleys with the elevation equipment, while the second layer simulates cable
oscillation. Numerical instability is avoided by suspending the oscillation layer when required. Due to the system
properties, this can be carried out in such a way that does not cause significant loss in the system quality. It
considers the oscillation of the cable between every pair of pulleys, collision detection and the variation of the
cable length very efficiently. Rendering issues are discussed, with remarks on how to prevent aliasing artifacts
in the cable. Efficiency is analyzed, including performance tests which show that the model can be run very
efficiently. The paper also covers how to integrate the model in a complex multibody simulation with a high degree
of interactivity.
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