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Structural Optimization of Multibody Systems

Författare

Redaktör

  • Josep M. Font-Llagunes

Summary, in English

Flexible multibody dynamics (FMD) has found many applications in control, analysis and design of mechanical systems. FMD together with the theory of structural optimization can be used for designing multibody systems with bodies which are lighter, but stronger. Topology optimization

of static structures is an active research topic in structural mechanics. However, the extension to

the dynamic case is less investigated as one has to face serious numerical difficulties. One way of extending static structural topology optimization to topology optimization of dynamic flexible multibody system with large rotational and transitional motion is investigated in this paper.

The optimization can be performed simultaneously on all flexible bodies. The simulation part of optimization is based on an FEM approach together with modal reduction. The resulting nonlinear differential-algebraic systems are solved with the error controlled integrator IDA (Sundials)

wrapped into Python environment by Assimulo. A modified formulation of solid isometric material with penalization (SIMP) method is suggested to avoid numerical instabilities and

convergence failures of the optimizer. Sensitivity analysis is central in structural optimization.

The sensitivities are approximated to circumvent the expensive calculations. The provided examples show that the method is indeed suitable for optimizing a wide range of multibody systems.

Standard SIMP method in structural topology optimization suggests stiffness penalization. To overcome the problem of instabilities and mesh distortion in the dynamic case we consider here additionally element mass penalization.

Avdelning/ar

Publiceringsår

2015

Språk

Engelska

Sidor

828-838

Publikation/Tidskrift/Serie

Proceedings of the ECCOMAS Thematic Conference on Multibody Dynamics 2015

Dokumenttyp

Konferensbidrag

Förlag

CIMNE

Ämne

  • Mathematics
  • Mechanical Engineering

Nyckelord

  • transient response
  • flexible multibody dynamics
  • Structural topology optimization
  • SIMP

Conference name

ECCOMAS Thematic Conference on Multibody Dynamics 2015

Conference date

2015-06-29 - 2015-07-02

Status

Published

Forskningsgrupp

  • Numerical Analysis

ISBN/ISSN/Övrigt

  • ISBN: 978-84-944244-0-3