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Sensitivity analysis for multibody systems formulated on a Lie group

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Abstract

A direct differentiation method and an adjoint variable method are proposed for the efficient semi-analytical evaluation of the sensitivities of multibody systems formulated in a matrix Lie group framework. These methods rely on the linearization of the equations of motion and/or of the time integration procedure. The simpler structure of the equations of motion in the Lie group formalism appears as an advantage for that purpose. Lie bracket contributions and the non-linearity of the exponential map need to be taken into account in the sensitivity algorithms. Nevertheless, essential characteristics of formulations of the direct differentiation method and the adjoint variable method on linear spaces are recovered. Some implementation issues are discussed and two relevant examples illustrate the properties of these methods.

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Acknowledgements

Valentin Sonneville would like to acknowledge the Belgian National Fund for Scientific research (FRIA) for its financial support. The authors also thank Martin Arnold for useful suggestions about the treatment of an acceleration-dependent functional using the adjoint variable method.

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Authors and Affiliations

  1. Department of Aerospace and Mechanical Engineering (LTAS), University of Liège, Chemin des Chevreuils 1, 4000, Liège, Belgium

    Valentin Sonneville & Olivier Brüls

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  1. Valentin Sonneville
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  2. Olivier Brüls
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Correspondence to Valentin Sonneville.

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Sonneville, V., Brüls, O. Sensitivity analysis for multibody systems formulated on a Lie group. Multibody Syst Dyn 31, 47–67 (2014). https://doi.org/10.1007/s11044-013-9345-z

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