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Behaviour of augmented Lagrangian and Hamiltonian methods for multibody dynamics in the proximity of singular configurations

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Abstract

Augmented Lagrangian methods represent an efficient way to carry out the forward-dynamics simulation of mechanical systems. These algorithms introduce the constraint forces in the dynamic equations of the system through a set of multipliers. While most of these formalisms were obtained using Lagrange’s equations as starting point, a number of them have been derived from Hamilton’s canonical equations. Besides being efficient, they are generally considered to be robust, which makes them especially suitable for the simulation of systems with discontinuities and impacts. In this work, we have focused on the simulation of mechanical assemblies that undergo singular configurations. First, some sources of numerical difficulties in the proximity of singular configurations were identified and discussed. Afterwards, several augmented Lagrangian and Hamiltonian formulations were compared in terms of their robustness during the forward-dynamics simulation of two benchmark problems. Newton–Raphson iterative schemes were developed for these formulations with the Newmark formula as numerical integrator. These outperformed fixed point iteration approaches in terms of robustness and efficiency. The effect of the formulation parameters on simulation performance was also assessed.

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Acknowledgments

The first author would like to acknowledge the support of the Spanish Ministry of Economy through its postdoctoral research program Juan de la Cierva, contract No. JCI-2012-12376.

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Authors and Affiliations

  1. Laboratorio de Ingeniería Mecánica, University of La Coruña, Mendizábal s/n, 15403, Ferrol, Spain

    Francisco González, Daniel Dopico & Javier Cuadrado

  2. PMA Division, Department of Mechanical Engineering, KU Leuven, Leuven, Belgium

    Roland Pastorino

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  1. Francisco González
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  2. Daniel Dopico
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  3. Roland Pastorino
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  4. Javier Cuadrado
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Correspondence to Francisco González.

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González, F., Dopico, D., Pastorino, R. et al. Behaviour of augmented Lagrangian and Hamiltonian methods for multibody dynamics in the proximity of singular configurations. Nonlinear Dyn 85, 1491–1508 (2016). https://doi.org/10.1007/s11071-016-2774-5

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