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Optimization of a complex flexible multibody systems with composite materials

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Abstract

The paper presents a general optimization methodology for flexible multibody systems which is demonstrated to find optimal layouts of fiber composite structures components. The goal of the optimization process is to minimize the structural deformation and, simultaneously, to fulfill a set of multidisciplinary constraints, by finding the optimal values for the fiber orientation of composite structures. In this work, a general formulation for the computation of the first order analytical sensitivities based on the use of automatic differentiation tools is applied. A critical overview on the use of the sensitivities obtained by automatic differentiation against analytical sensitivities derived and implemented by hand is made with the purpose of identifying shortcomings and proposing solutions. The equations of motion and sensitivities of the flexible multibody system are solved simultaneously being the accelerations and velocities of the system and the sensitivities of the accelerations and of the velocities integrated in time using a multi-step multi-order integration algorithm. Then, the optimal design of the flexible multibody system is formulated to minimize the deformation energy of the system subjected to a set of technological and functional constraints. The methodologies proposed are first discussed for a simple demonstrative example and applied after to the optimization of a complex flexible multibody system, represented by a satellite antenna that is unfolded from its launching configuration to its functional state.

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Authors and Affiliations

  1. IDMEC, Instituto Superior Técnico, Technical University of Lisbon, Av. Rovisco Pais, 1, 1049-001, Lisboa, Portugal

    Jorge A. C. Ambrósio

  2. Department of Mechanical Engineering, Faculdade de Ciência e Tecnologia da Universidade de Coimbra, 3020, Coimbra, Portugal

    Maria Augusta Neto & Rogério P. Leal

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  1. Jorge A. C. Ambrósio
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  2. Maria Augusta Neto
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  3. Rogério P. Leal
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Correspondence to Jorge A. C. Ambrósio.

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Ambrósio, J.A.C., Neto, M.A. & Leal, R.P. Optimization of a complex flexible multibody systems with composite materials. Multibody Syst Dyn 18, 117–144 (2007). https://doi.org/10.1007/s11044-007-9086-y

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